Led-based illumination module with preferentially illuminated color converting surfaces.

(54) Title: LIGHTING MODULE BASED ON LIGHT EMITTING DIODES WITH PREFERENTIALLY LIGHTED COLOR CONVERSION SURFACES.

(54) Title: LED-BASED ILLUMINATION MODULE WITH PREFERENTIALLY ILLUMINATED COLOR CONVERTING SURFACES.

(57) Summary

A lighting module (100) includes a color conversion cavity (160) with a first inner surface (107) having a first wavelength conversion material (172), and a second inner surface (108) having a second wavelength conversion material (135); a first LED (102A, 102B) is configured to receive a first current (184) and to emit light that preferentially illuminates the first interior surface (107); a second LED (102C, 102D) is configured to receive a second current (185) and to emit light that preferentially illuminates the second interior surface (108); the first stream (184) and the second stream (185) are selectable to achieve a correlative color temperature range (CCT) of the light output per parle of the LED-based lighting device (100).

(57) Abstract

An illumination module (100) ineludes a color conversion cavity (160) with a first interior surface (107) having a first wavelength converting material (172) and a second interior surface (108) having a second wavelength converting material (135). A first LED (102A, 102B) is conligured to receive a first current (184) and to emit light that preferentially illuminates the first interior surface (107). A second LED (102C, 102D) is configured to receive a second current (185) and emit light that preferentially illuminates the second interior surface (108). The first current (184) and the second current (185) are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination module (100).

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Institute

Mexican Property

Industrial _SE_

5KBJKÍA W tCOHOMÚ

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PATENT TITLE NO. 341876

Owner (s): XICATO, INC.

Address: 101 Daggett Drive, San José, California, 95134, USA

Name: LIGHTING MODULE BASED ON LIGHT EMITTING DIODES WITH PREFERENTIALLY LIGHTED COLOR CONVERSION SURFACES.

Classification:

Inventor (s):

Number:

MX / a / 2015/011093

Country:

US

US lnt.CI.8: F21V7 / 00; F21V7 / 22; F21V9 / 16; H05B33 / 08 GERARD HARBERS; SERGE JA BIERHUIZEN; HONG LUO

REQUEST

International filing date: July 30, 2012 Divisional Patent Number: 332765

PRIORITY

Date: Number:

August 2011 July 27, 2012

61/514,258

13/560,827

Validity: Twenty year!

-Expiration Date: July 30, 2032

The reference patent is granted based on articles 1, 2 fraction V, 6 fraction IH, and fifldela Law of Industrial Property.

Validity of twenty renewable years, gives the rate to keep the

In accordance with article 23 of the Industrial Property Law, this patent

Sxjntada from the date of filing rights of the International application and will be subject to payment

Whoever subscribes the present title, does so by merging it with me in the OTPWMifi for «to articulate * 9 ° to 'iones III and 7 ° bis 2 of the Industrial Property Law (Merlo OficBjl de la Federación (DO F) 27JWM®,« taken « I Ο2Λ »'¹994 25 10/1996, 12/26/1 &lt;fe7, 05/17/1999, 01/26/2004, 06/16/2002 »01/25/2 ^) 6. 06/05 / 2009,06 / 01/2010, 18 / θΟ »Μ · Ι« ΒΜΜ7 / 01/2012 and ua / u4 / 2012); articles!⁰, 3rd fraction V subsection a), 4th and 12th fractions I κ III of the Regulation of the Mexican Institute of Industrial Property (DOF 14/12 / 19®, amended on 07/01/2002 «ΛΤβΟΜ, 28/07 / 2004 and 7AW2OT7); articles 1 »8 * · ^« «tooefón V WWSeewwe» ry W and 86 «felEst atuto Orgânico from the Mexican Institute of Industrial Property (DOF 12/27/1999, amended on 10/10/2002, 07/29/2004, 08/04/2004 and 09/13/2007); 1, 3 and 5 Clause a) of the Agreement that delegates powers to the Deputy Directors General, Coordinator, Divisional Directors, Holders of the Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property. (DOF 12/15/1999, amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007).

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Areraí No 550. Floor 1,

Col Pueblo Santa María Tepepan.

Xochimitco. CP 16020. Mexico City

T'eí. (55¡ 53 34 07 00 wwwintpt

Issue Date: September 5, 2016

THE DIVISIONAL DIRECTOR OF PATENTS

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• Ί

NAHANNY CANAL REYES

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MX / 2016/72389

IMPIOUS

MEXICAN INSTITUTE 'ps'í &amp; r ·

FROM PROWSOaq

INDUSTRIAL

LIGHTING MODULE BASED ON LIGHT EMITTING DIODES

WITH COLOR CONVERSION SURFACES

PREFERENTIALLY LIGHTED

CROSS REFERENCE TO RELATED REQUESTS

This application claims the benefit of the US Application

No. 13 / 560,827, filed on July 27, 2012, which, in turn, claims priority under 35 USC 119 of US Provisional Application No.

61 / 514,258, filed on August 2, 2011, both are incorporated by reference in their entirety herein.

TECHNICIAN FIELD

The described modalities are related to lighting modules that include Light Emitting Diodes (LEDs).

BACKGROUND OF THE INVENTION

The use of light emitting diodes in general lighting is still limited due to limitations in the level of light output or flux generated by lighting devices. Lighting devices that use LEDs also generally have poor color quality

IMP

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MEXICAN INSTITUTE OF PROPERTY

INDUSTRIAL

<img file="MX341876B_D0007.tif" />

characterized by instability of color point. La nacha) - »· liriad Ha color point varies over time as well as from part to part. Poor color quality is also characterized by poor color conversion, which is due to the spectrum produced by LED light sources that have bands with little or no energy. Additionally, lighting devices that use LEDs generally have spatial and / or angular variations in color. Additionally, lighting devices that use LEDs are expensive due to, among other things, the need for the electronics and / or color control sensors required to maintain the color point of the light source or to use only a small selection of the LEDs produced that i

meet the color and / or flow requirements for the application.

Accordingly, improvements to the lighting device using light emitting diodes as the light source are desirable.

BRIEF DESCRIPTION OF THE INVENTION

A lighting module includes a color conversion cavity with a first interior surface having a first wavelength conversion material, and a second interior surface having a second wavelength conversion material. A first LED is configured to receive a first current and to emit light that preferentially illuminates the first interior surface. A second LED is configured to receive a second current and to emit light that illuminates

<img file="MX341876B_D0008.tif" />

IMPI

MEXICAN INSTITUTE

OF THE PROPERTY

INDUSTRIAL preferably to the second inner surface. I to first stream and second stream are selectors to achieve a correlative color temperature range (CCT) of light output from the LED-based lighting device.

Further details and modalities and techniques are described in the following detailed description. This Brief Description of the Invention does not define the invention. The invention is defined by the claims.

BRIEF DESCRIPTION OF THE FIGURES

Figures 1, 2 and 3 illustrate three exemplary luminaires, including a lighting fixture, a reflector, and a light fixture.

Figure 4 illustrates an exploded view of the components of the LED-based lighting module illustrated in Figure 1.

Figures 5A and 5B illustrate perspective, cross-sectional views of the LED-based lighting module shown in Figure 1.

Figure 6 illustrates a graph of correlated color temperature (CCT) versus relative flux for a halogen light source and an LED-based lighting device in one embodiment.

Figure 7 illustrates a graph of simulated relative energy fractions to achieve a CCT range for light emitted by an LED-based lighting module.

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<img file="MX341876B_D0009.tif" />

Figure 8 is illustrative of a cross-sectional side view of an LED-based Lighting module in one embodiment.

Figure 9 is illustrative of a top view of the LED-based lighting module depicted in Figure 8.

Figure 10 is illustrative of a top view of an LED-based lighting module that is divided into five zones.

Figure 11 is illustrative of a cross section of an LED-based lighting module in another embodiment.

Figure 12 is illustrative of a cross section of an LED-based lighting module in another embodiment.

Figure 13 is illustrative of a cross section of an LED-based lighting module in another embodiment.

Figure 14 is illustrative of a cross section of an LED-based lighting module in another embodiment.

Figure 15 is illustrative of a cross section of an LED-based lighting module in another embodiment.

Figure 16 is illustrative of a cross-sectional side view of an LED-based lighting module in another embodiment.

Figure 17 is illustrative of a top view of the LED-based Lighting module depicted in Figure 16.

Figure 18 is illustrative of a top view of an LED-based lighting module in another embodiment.

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INSTITUTO MEXICANO D £ La FROMCíjao industrial

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Figure 19 is illustrative of a cross-sectional side view of the LED-based Lighting module depicted in Figure 18.

Figure 20 illustrates a graph of the xy color coordinates in 5 of the 1931 CIE color space achieved by the modality of the

LED-based lighting 100 illustrated in Figures 18 to 19.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in more detail to background examples and some embodiments of the invention, the examples of which are illustrated in the accompanying drawings.

Figures 1, 2 and 3 illustrate three example luminaires, all denoted by 150. The luminaire illustrated in Figure 1 includes an Illumination module 100 with a rectangular shape factor. The luminaire illustrated in Figure 2 includes an Illumination module 100 with a circular form factor. The luminaire illustrated in figure 3 includes a lighting module 100 integrated in a conversion lamp device. These examples are for illustrative purposes. Examples of Lighting modules of general polygonal and elliptical shapes can also be seen. Luminaire 150 Includes an Illumination module 100, a reflector 125, and a light fixture 120. As described, light fixture 120 includes a heat dissipation capability and may therefore sometimes be

<img file="MX341876B_D0012.tif" />

referred to as heat sink 120. However, light fixture 120 may include other structural and decorative elements (not shown). Reflector 125 is mounted on lighting module 100 to collimate or deflect light emitted from lighting module 100. Reflector 125 can be made of a thermally conductive material, such as a material including aluminum or copper, and can be coupled thermally to lighting module 100. Heat flows by conduction through lighting module 100 and thermally conductive reflector 125. Heat also flows by thermal convection over reflector 125. Reflector 125 may be a composite parabolic concentrator, where the concentrator is constructed or coated with highly reflective material. Optical elements, such as a diffuser or reflector 125, may be removably coupled to lighting module 100, for example, by means of threads, a clamp, a twist lock mechanism, or other appropriate arrangement. As illustrated in Figure 3, the reflector 125 may include side walls 126 and a window 127 that are optionally coated, for example, with a wavelength conversion material, a diffusion material, or any other desired material.

As shown in Figures 1, 2 and 3, the lighting module 100 is mounted on a heat sink 120. The heat sink 120 can be made of a thermally conductive material, such as a material including aluminum or copper, and can be thermally coupled to lighting module 100. Heat flows by conduction through the module

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MEXICAN INSTITUTE / ¿• ίν &amp; ΧϊΖ '«OF THE PROPERTY Λ» / «· *« * i of lighting 100 and the thermally conductive heatsink í ^ 0.^IALThe EI c also flows by thermal convection on the heat sink 120. The lighting module 100 can be attached to the heat sink 120 by means of screw threads to fix the lighting module 100 to the heat sink.

120. To facilitate easy removal and replacement of the lighting module

100, the lighting module 100 may be removably coupled to the heat sink 120, for example, by means of a locking mechanism, a twist lock mechanism, or other appropriate arrangement. Lighting module 100 includes at least one thermally conductive surface that is thermally coupled to heat sink 120, for example, directly or using thermal grease, thermal tape, thermal pads, or a thermal epoxy. For proper cooling of the LEDs, a thermal contact area of ​​at least 50 square millimeters, but preferably 100 square millimeters, must be used for one watt of electrical energy flow within the LEDs on the board. For example, in the case when using 20 LEDs, a heat sink contact area of ​​1000 to 2000 square millimeters should be used. The use of a larger heat sink 120 can allow LEDs 102 to be operated at higher power, and also allows the use of different designs of the heat sink. For example, some designs may exhibit a cooling capacity that is less dependent on the orientation of the heat sink. Also, fans or other solutions for forced cooling can be used to dissipate heat from the device. The heat sink *

Bottom may include a Mexican i ινι jP I • wnrry and *. Xj.- ,, '^JÍ!'^TO| ÁoUSTR AL opening so that you can ^ acersé ^ You make electrical connections in the lighting module 100.

Figure 4 illustrates an exploded view of the components of the LED-based lighting module 100 as illustrated in Figure 1, by way of example. It should be understood that as defined herein an LED-based lighting module is not an LED, but an LED light source or installation or a component part of an LED light source or installation. For example, an LED-based lighting module may be an LED-based replacement lamp such as that depicted in FIG. 3. LED-based lighting module 100 includes one or more packaged LED or LED molds and a assembly to which the LED mold or packaged LEDs are attached. In one embodiment, LEDs 102 are packaged LEDs, such as Luxeon Rebels manufactured by Philips Lumileds Lighting. Other types of packaged LEDs can also be used, such as those made by OSRAM (Oslon package), Luminus Devices (USA), Cree (USA), Nichia (Japan), or Tridonic (Austria). As defined herein, a packaged LED is an assembly of one or more LED molds that contain electrical connections, such as wire junction connections or solder balls, and possibly includes an optical element and thermal, mechanical, and electrical interfaces. . The LED chip is generally about 1mm by 1mm by 0.5mm in size, but these dimensions may vary. In some embodiments, LEDs 102 can include multiple chips. The multiple chips can emit light from

IMPI

MEXICAN INSTITUTE OF PROPERTY

INDUSTRIAL

<img file="MX341876B_D0013.tif" />

Similar or different colors, for example, red, green, and blue. Mounting board 104 is attached to mounting base 101 and secured in position by means of mounting board retaining ring 103. Together, the mounting board 104 populated by LEDs 102 and the retaining ring of the mounting board Mounts 103 comprise a light source sub-assembly 115. Light source sub-assembly 115 operates to convert electrical energy to light using LEDs 102. Light emitted from the light source sub-assembly

115 it is directed to light conversion subassembly 116 for color matching and color conversion. The light conversion sub-assembly 116 includes the cavity body 105 and an output port, which is illustrated as, but not limited to, an output window 108. The light conversion sub-assembly 116 may include a lower reflector 106 and a side wall 107, which may optionally be formed of inserts. The outlet window 108, if used as an outlet port, is attached to the top of the cavity body 105. In some embodiments, the outlet window 108 may be attached to the cavity body 105 by an adhesive. To promote heat dissipation from the outlet window to the cavity body 105, a thermally conductive adhesive is desirable. The adhesive must reliably resist the temperature present at the interface of the outlet window 108 and the cavity body 105. Additionally, it is preferable that the adhesive either reflect or transmit as much incident light as possible, rather than absorb light emitted from exit window 108. In one example, the combination of thermal tolerance,

IMPL ·,

MEXICAN INSTITUTE

D £ THE PROPERTY industrial thermal conductivity, and optical properties of one of various adhesives manufactured by Dow Corning (USA) (for example, model numbers SE4420, SE4422, SE4486, 1-4173, or SE9210 by Dow Corning), provides a adequate performance. However, other thermally conductive adhesives can also be considered.

Any of the interior walls of the cavity body 105 or the side wall insert 107, when optionally placed within the cavity body 105, is reflective, such that the light from LEDs 102, as well as any light with wavelength converted, it is reflected within cavity 160 until it is transmitted through the outlet port, eg outlet window 108 when mounted on light source sub-assembly 115. Lower reflector insert 106 can optionally be placed on mounting board 104. Lower reflector insert 106 includes holes so that the light emitting portion of each LED 102 is not blocked by lower reflector insert 106. Side wall insert 107 can optionally be positioned inside cavity body 105 such that the interior surfaces of side wall insert 107 direct light from LEDs 102 to the exit window when cavity body 105 is mounted on the light source sub-assembly 115. Although as described, the interior side walls of the cavity body 105 are rectangular in shape, viewed from the top of the lighting module 100, other shapes can be envisaged (eg, cloverleaf or polygonal shape). Furthermore, the inner side walls of the cavity body 105 may ίμρι ....._........

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The lower reflector insert 106 and the side wall insert 107 can be highly reflective so that the light reflecting downward in the cavity 160 is generally reflected towards the exit port, eg exit window 108. Additionally, inserts 106 and 107 can have high thermal conductivity, such that it acts as an additional heat propagator. By way of example, inserts 106 and 107 can be made of a high and thermally conductive material, such as an aluminum based material that is processed to make the material highly reflective and durable. As an example, a material referred to as Miro®, manufactured by Alanod, a German company, can be used. High reflectivity can be achieved by polishing the aluminum, or by covering the inner surface of the inserts 106 and 107 with one or more reflective coatings. Alternatively, inserts 106 and 107 may be made of a highly reflective thin material, such as Vikuiti ™ ESR, as sold by 3M (USA), LumirrorTM E60L manufactured by Toray (Japan), or microcrystalline polyethylene terephthalate (MCPET) such such as the one manufactured by Furukawa Electric Co. Ltd. (Japan). In other examples, inserts 106 and 107 can be made of a polytetrafluoroethylene (PTFE) material. In some examples inserts 106 and 107 can be made of a PTFE material with a thickness of one to two millimeters, such as that sold

<img file="MX341876B_D0014.tif" />

industrial by WL Gore (USA) and Berghof (Germany). In still other embodiments, inserts 106 and 107 can be constructed of a PTFE material backed by a thin reflective layer such as a metallic layer or a non-metallic layer such as ESR, E60L, or MCPET. In addition, highly diffuse reflective coatings can be applied to any of the side wall insert 107, the lower reflective insert 106, the outlet window 108, the cavity body 105, and the mounting board 104. Such coatings may include particles of carbon dioxide. titanium (TiO2), zinc oxide (ZnO), and barium sulfate (BaSO4), or a combination of these materials.

Figures 5A and 5B illustrate perspective cross-sectional views of the LED-based lighting module 100 depicted in Figure 1. In this embodiment, the side wall insert 107, the outlet window 108, and Bottom reflector insert 106 provided in assembly board 104 defines a color conversion cavity 160 (illustrated in Figure 5A) in LED-based lighting module 100. A portion of light from LEDs 102 is reflected within color conversion cavity 160 until it exits through exit window 108. Reflecting light within cavity 160 before it exits through exit window 108 has the light mixing effect and provides a more even distribution of the light that is emitted from the LED Lighting module 100. Additionally, as light is reflected within cavity 106, before it exits through exit window 108, an amount of light undergoes light conversion

PROPERTIES&gt;

MEXICAN INSTITUTE

From the extremely industrial 'dV „Í3í¡í through interaction with a wavelength conversion material included in cavity 160.

As depicted in Figures 1-5B, the light generated by LEDs 102 is generally emitted within the color conversion cavity

160. However, various modalities are introduced herein to preferably direct the light emitted from specific LEDs 102 towards specific interior surfaces of the LED 100 based module. Thus, preferably the LED 100 based module includes color conversion surfaces. preferentially stimulated. In one aspect, the light emitted by certain LEDs 102 is preferentially directed towards an interior color conversion cavity surface 160 that includes a first wavelength conversion material and light emitted from some other LEDs 102 is preferentially directed towards another surface interior of the color conversion cavity 160 including a second wavelength conversion material. In this way an effective way of color conversion can be achieved which is more efficient than with general flooding of the interior surfaces of the color conversion cavity 160 with light emitted from the LEDs 102.

LEDs 102 can emit different or equal colors, either by direct emission or by phosphor conversion, for example, where phosphor layers are applied to LEDs as part of the LED package. Lighting module 100 can use any combination of color 102 LEDs, such as red, green, blue, amber, or cyan, or LEDs 102

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INDUSTRIAL can all produce light of the same color. Some or all of LEDs 102 may produce white light. In addition, LEDs 102 can emit polarized or non-polarized light, and LED-based lighting module 100 can use any combination of polarized or non-polarized LEDs. In some embodiments, LEDs 102 emit either blue or UV light due to the efficiency of LEDs emitting in these wavelength ranges. The light emitted from lighting module 100 has a desired color when LEDs 102 are used in combination with wavelength conversion materials included in color conversion cavity 160. The photo-conversion properties of the conversion materials wavelength in combination with mixing of light within cavity 160 results in color-converted light output. By adjusting the chemical and / or physical properties (such as thickness and concentration) of the wavelength conversion materials and the geometric properties of the coatings on the interior surfaces of cavity 160, specific color properties can be specified of light output through exit window 108, for example color point, color temperature, and color rendering index (CRI).

For the purposes of this patent document, a wavelength conversion material is any chemical compound alone or a mixture of different chemical compounds that performs a color conversion function, for example, that absorbs a quantity of light from a

<img file="MX341876B_D0017.tif" />

maximum wavelength, and in response, emits an amount of light at another maximum wavelength.

Portions of cavity 106, such as lower reflector insert 106, side wall insert 107, cavity body 105, outlet window 108, and other components placed within the cavity (not shown) may be coated with or include a wavelength conversion material. FIG. 5B illustrates portions of the side wall insert 107 coated with a wavelength conversion material. Furthermore, different components of cavity 160 can be coated with a conversion material of the same or different wavelength.

As an example, the luminophores can be selected from the set denoted by the following chemical formulas: Y3AI5O12: Ce, (also known as YAG: Ce, or simply YAG) (Y, Gd) 3AI5O12: Ce, CaS: Eu, SrS: Eu, SrGa2S4: Eu, Ca3 (Sc, Mg) 2Si3O12: Ce, Ca3Sc2Si3O12: Ce , Ca3Sc2O4: Ce, Ba3Si6O12N2: Eu, (Sr, Ca) AISiN3: Eu, CaAISiN3: Eu, CaAISi (ON) 3: Eu, Ba2SiO4: Eu, Sr2SiO4: Eu, Ca2SiO4: Eu, CaSc2O4: Ce, CaSi2O SrSi2O2N2: Eu, BaSi2O2N2: Eu, Ca5 (PO4) 3CI: Eu, Ba5 (PO4) 3CI: Eu, Cs2CaP2O7, Cs2SrP2O7, Lu3AI5O12: Ce, Ca8Mg (SiO4) 4CI2: Eu, Sr8Mg (S2O4) La3Si6N6: Ce, Y3Ga5O12: Ce, Gd3Ga5O12: Ce, Tb3AI5O12: Ce, Tb3Ga5O12: Ce, and Lu3Ga5O12: Ce.

In one example, adjusting the color point of the lighting fixture can be accomplished by replacing the side wall insert 107 and / or the outlet window 108, which can similarly be coated or impregnated

MEXICAN INSTITUTE OF PROPERTY

INDUSTRIAL with one or more wavelength conversion materials. In one embodiment a red emitting phosphor such as a europium activated alkaline earth silicon nitride (eg (Sr, Ca) AISiN3: Eu) covers a portion of the side wall insert 107 and the lower reflector insert 106 at the bottom of the cavity 160, and a YAG phosphor covers a portion of the exit window 108. In another embodiment, a red light emitting phosphor such as alkaline earth oxy-silicon nitride covers a portion of the side wall insert 107 and the lower reflector insert 106 at the bottom of cavity 160, and a mixture of a red light-emitting alkaline-earth oxy-silicon nitride and a yellow light-emitting YAG phosphor covers a portion of the exit window 108.

In some embodiments, the luminophores are mixed in a suitable solvent medium with a binder and, optionally, a surfactant and a plasticizer. The resulting mixture is deposited by either inter-spraying, sieve printing, sheet coating, or other suitable means. By selecting the shape and height of the side walls that define the cavity, and by selecting which of the parts in the cavity will be covered with phosphor or not, and by optimizing the layer thickness and concentration of the phosphor layer in the surfaces of the light mixing cavity 160, the color point of the light emitted from the module can be modified as desired.

In one example, a single type of wavelength conversion material can be modeled on the side wall, which can be, for example,

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Dfc THE PKeFIEDAD &lt;? SarwT&gt; ti INDUSTRIAL ^ aJ *** example, the Sidewall Insert 107 shown in Figure 5B. By way of example, a red luminophore can be patterned in different areas of the side wall insert 107 and a yellow luminophore can cover the exit window 108. The coverage and / or concentrations of the luminophores can be varied to produce different temperatures of Colour. It should be understood that the range area of ​​the red and / or the concentrations of the red and yellow luminophores will need to vary to produce the desired color temperatures if the light produced by the LEDs 102 varies. The color performance of LEDs 102, red phosphor in Side Wall Insert 107, and yellow phosphor in outlet window 108 can be measured prior to assembly and selected based on performance for assembled parts to produce the desired color.

In many applications it is desirable to generate a white light output with a correlative color temperature (CCT) of less than 2826.8 degrees

Centigrade. For example, in many applications, white light with a CCT of 2426.8 Centigrade is desired. Generally, an amount of red emission is required to convert the light generated from the LEDs emitting in the blue or UV portions of the spectrum into a white light output with a CCT of less than 2826.8 degrees Celsius. Efforts are underway to mix the yellow phosphor with red emitting phosphors such as

CaS: Eu, SrS: Eu, SrGa2S4: Eu, Ba3S¡6O12N2; Eu, (Sr, Ca) AIS¡N3: Eu,

CaAIS¡N3: Eu, CaAIS¡ (ON) 3; Eu, Ba2S¡O4: Eu, Sr2S¡O4: Eu, Ca2SiO4: Eu, l

CaS¡2O2N2: Eu, SrSi2O2N2: Eu, BaSi2O2N2: Eu, Sr8Mg (S¡O4) 4CI2: Eu,

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MEXICAN INSTITUTE

DB THE INDUSTRIAL PROPERTY tVJttLA

Li2NbF7: Mn4 +, Li3ScF6; Mn4 +, La2O2S: Eu3 + and MgO.MgF2.GeO2: Mn4 + to achieve the required CCT. However, the color consistency of the output light is normally poor due to the sensitivity of the CCT of the output light to the red phosphor component in the mixture. Poor color distribution is most evident in the case of mixed luminophores, particularly in lighting applications. By coating the exit window 108 with a phosphor or a phosphor mixture that does not include any red emitting phosphor, problems with color consistency can be avoided. To generate the white light output with a CCT less than 2826.8 Centigrade, a red emitting luminophore or a mixture of luminophores is deposited on either side wall and the lower reflector of the 100 LED based lighting module. The specific red-emitting phosphor or phosphor (for example, the maximum wavelength emission from 600 nanometers to 700 nanometers) as well as the concentration of the red-emitting phosphor or phosphorescent phosphor are selected to generate a white light output with a CCT less than 2826.8 Centigrade. In this way, an LED-based lighting module can generate white light with a CCT less than 2826.8 ° C with an output window that does not include a red emitting phosphor component.

It is desirable for an LED-based lighting module to convert a portion of light emitted from the LEDs (eg, blue light emitted from the LEDs 102) into light with a larger wavelength in at least one color conversion cavity 106 while that the

<img file="MX341876B_D0018.tif" />

<img file="MX341876B_D0019.tif" />

MSXICAN INSTITUTE I HEAR THE PROPERTY

INDUSTRIAL photon losses. Thin, densely packed layers of light phosphor are suitable for efficiently converting color from a significant portion of incident light while minimizing losses associated with reabsorption by adjacent light phosphor particles, total internal reflection (IRR), and the effects of Fresnel.

Figure 6 illustrates a graph 200 of the correlative color temperature (CCT) against relative flux for a halogen light source. Relative flow is plotted as a percentage of the maximum recorded energy level of the device. For example, 100% is the operation of the light source at its maximum recorded energy level, and 50% is the operation of the light source at half of its maximum registered energy level. Line 201 of the graph is based on experimental data collected from a 35W halogen lamp. As illustrated, at the maximum recorded energy level, the light emission of the 35W halogen lamp was 2626.8 ° C. As the halogen lamp is made to emit lower levels of relative flux, the CCT of the light output of the halogen lamp decreases. For example, at a flux of 25%, the CCT of the light emitted by the halogen lamp is approximately 2226.8 ° C. To achieve further reductions in CCT, the halogen lamp should be made to emit very low levels of relative flux. For example, to achieve a CCT of less than 1826.8 ° C, the halogen lamp must be operated at a relative hand flux level of 5%. However, a traditional halogen lamp is capable of reaching CCT levels below 1826.8 ° C, this can only be done

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INDUSTRIAL by severely reducing the intensity of the light emitted by each lamp. These extremely low intensity levels make food spaces very dark and uncomfortable for users.

A better option is a light source that exhibits a dimming characteristic similar to the illustration on line 202. The line

202 exhibits a reduction in CCT to medicament which reduces light intensity from 100% to 50% relative flux. At a relative flow of 50%, a CCT of 1626.8 ° C is obtained. Additional reductions in relative flow do not significantly change the CCT. In this way, a restaurant operator can adjust the intensity of the light level in the environment over a wide range (for example, a relative flux of 0-50%) to a desired level, without changing the desirable characteristics of CCT of the light emitted.

As an example, line 202 is illustrated. Many other exemplary color characteristics for dimmable light sources can be contemplated.

In some embodiments, the lighting device based on

LED 100 can be configured to achieve relatively large changes in CCT, with relatively small changes in flux levels (for example, as illustrated in line 202 a relative flux of 50-100%) and also to achieve changes relatively large at the flow level with relatively small changes in CCT (eg, as illustrated in line 202 a relative flow of 0-50%).

Figure 7 illustrates a graph 210 of simulated relative energy fractions to achieve a CCT range for light emitted by a

<img file="MX341876B_D0020.tif" />

MEXICAN INSTITUTE OF PROPERTY lighting module based on LED 100. The fractions d ©^oréffé! rgí describe the relative contribution of three different ΰΐ6ΠΊΰΠΙϋδδΠΤΙ5ΌΓδδ^,θ6 · light, inside the LED-based lighting module 100: an arrangement of

Blue light emitting LEDs, a number of green light emitting luminophores (model BG201A manufactured by Mitsubishi, Japan), and a quantity of red emitting luminophore (model BR102D manufactured by Mitsubishi, Japan). As illustrated in Figure 7, the contributions of a red light emitting element must dominate over the green and blue emission to achieve a CCT level of less than 1826.8 ° C. Additionally, the blue emission must be significantly attenuated.

Changes in CCT over the entire operating range of an LED-based lighting device 100 can be achieved by employing LEDs with similar emission characteristics (eg, all blue emission LEDs) that preferentially illuminate different color conversion surfaces. By controlling the relative flux emitted from different zones of LEDs (by independent control of the current supplied to the LEDs in different zones, as illustrated in Figure 8), changes in CCT can be achieved. For example, in this way changes of more than 26.85 Centigrade can be achieved over the entire operating range.

Changes in CCT over the operating range of an LED-based lighting device 100 can also be achieved with the introduction of different LEDs that preferentially illuminate different color conversion surfaces. By controlling the relative flow emitted from

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<img file="MX341876B_D0023.tif" />

INSTITUTO MEXICANO DE LA PROPIEDAD INDUSTRIAL different zones of LEDs of different types (by means of the Independent control of the current supplied to the LEDs in different zones, as illustrated in figure 8), changes in the CCT can be achieved. For example, changes of more than 226.85 ° C can be achieved in this way.

Figure 8 is illustrative of a cross sectional side view of an LED-based Lighting module 100 in one embodiment. As illustrated, the LED-based Lighting module 100 includes a plurality of LEDs 102A-102D, a side wall 107, and an exit window 108. The side wall 107 includes a reflective layer 171 and a color conversion layer 172 . The color conversion layer 172 Includes a wavelength conversion material (eg, a red light emitting phosphor). The output window 108 Includes a transmitter layer 134 and a color conversion layer 135. The color conversion layer 135 includes a wavelength conversion material with a different color conversion property from the wavelength conversion material included in the side wall 107 (eg, a yellow light emitting phosphor). The color conversion cavity 160 is formed by the interior surfaces of the LED-based lighting module 100, including the interior surface of the side wall 107 and the interior surface of the exit window 108.

LEDs 102A-102D LED-Based Lighting Module

100 they emit light directly into the 160 color conversion cavity.

Light mixes and its color is converted into the conversion cavity of

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Cí LA * Ρ3 · 71 '* ΕΓ'Ζ.: Ϊ́ color 160, and the resulting combined light 141 is emitted by the LED-based lighting module 100.

A different current source supplies power to the LEDs

102 in different preferential areas. In the example depicted in FIG. 8, current source 182 supplies current 185 to LEDs 102C and 102D that are located in preferential zone 2. Similarly, current source 183 supplies current 184 to LEDs 102A and 102B located in preferential zone 1. By separately controlling the current supplied to LEDs located in different preferred zones, the correlated color temperatures (CCTs) of the combined light 141 emitted by the LED-based lighting module can be adjusted over a wide range of CCTs . For example, the achievable CCT range may exceed 26.85 ° C. In other examples, the achievable CCT range may exceed 226.85 ° C. In yet another example, the achievable CCT range may exceed 726.85 ° C. In some examples, the achievable CCT may be less than 1726.85 ° C.

In one aspect, the LEDs 102 included in the LED-based lighting module 100 are located in different areas that preferentially illuminate different color conversion surfaces of the color conversion cavity 160. For example, as illustrated, some LEDs 102A and 102B are located in zone 1. The light emitted from LEDs 102A and 102B located in zone 1 preferentially illuminates side wall 107, since LEDs 102A and 102B are located in close proximity to the

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MEXICAN INSTITUTE.

OF THE PROPERTY C ^ asaSS &amp; s / i

INDUSTRIAL side wall 107. In some modes, more than fifty percent of the light output from LEDs 102A and 102B is directed toward the side wall 107. In some other modes, more than seventy-five percent of the light output of LEDs 102A and 102B is directed toward side wall 107. In some other embodiments, more than ninety percent of the light output from LEDs 102A and 102B is directed toward side wall 107.

As illustrated, some LEDs 102C and 102D are located in zone 2. Light output from LEDs 102C and 102D in zone 2 is directed toward exit window 108. In some embodiments, more than fifty percent of the light output from LEDs 102C and 102D is directed toward output window 108. In some other embodiments, more than seventy-five percent of the light output from LEDs 102C and 102D is directed toward output window 108 . In some other modes, over ninety percent of the light output from LEDs 102C and 102D is directed toward the output window

108.

In one embodiment, the light emitted by the LEDs located in the preferential zone 1 is directed towards the side wall 107, which may include a red light emitting phosphor material, while the light emitted from the LEDs located in the Preferred zone 2 is directed towards exit window 108, which may include a green light emitting phosphor material and a red light emitting liminophore material. By adjusting the current 184 supplied to the LEDs located in zone 1, relative to the current 185 supplied to the LEDs located in zone 2, you can adjust the

<img file="MX341876B_D0024.tif" />

amount of red light relative to green light included in combined light

141. In addition, the amount of blue light relative to red light is also reduced, as a larger amount of blue light emitted from LEDs 102 interacts with the red phosphor material in the color conversion layer.

172 before interacting with the green and red luminophore materials of the color conversion layer 135. This increases the probability that a blue photon emitted by LEDs 102 will be converted to a red photon, since current 184 increases relative to stream 185. Thus, the control of currents 184 and 185 can be used to adjust the CCT of the light emitted from the LED-based lighting module 100 from a relatively high CCT (eg, about 2726.85 ° C) to a relatively low CCT ( for example, approximately 1726.85 ° C) according to the proportions indicated in figure 7.

In some embodiments, LEDs 102A and 102B in zone 1 can be selected with emission properties that efficiently interact with the wavelength conversion material included in the side wall 107. For example, the emission spectrum of LEDs 102A and 102B in zone 1 and the wavelength conversion material on side wall 107 can be selected such that the emission spectrum of LEDs and the spectrum of Absorption of the wavelength conversion material closely match. This ensures a very efficient color conversion (for example, the conversion to red light). Similarly, LEDs 102C and 102D in zone 2 can be selected to have

<img file="MX341876B_D0025.tif" />

Emission properties that interact efficiently with the wavelength conversion material included in output window 108. For example, the emission spectrum of LEDs 102C and 102D in zone 2 and the wavelength conversion material in output window 108 can be selected such that the emission spectrum of the LEDs and the absorption spectrum of the wavelength conversion material closely match. This ensures a very efficient color conversion (for example, the conversion to red and green light).

Additionally, by employing different areas of LEDs that each preferentially illuminate a different color conversion surface, the occurrence of an inefficient two-step color conversion process is minimized.For example, a photon 138 generated by an LED (for example, blue, violet, ultraviolet, etc.) of zone 2, is directed to the color conversion layer 135. Photon 138 interacts with a wavelength conversion material in color conversion layer 135, and is converted to a lambertian emission of the converted color light (eg, green light). By minimizing the content of red light emitting phosphor in color conversion layer 135, it increases the probability that the reflected red and green lights back will be reflected once more towards the exit window

108, without being absorbed by some other wavelength conversion material. Similarly, a photon 137 generated by an LED (eg blue, violet, ultraviolet, etc.) in zone 1 is directed to the color conversion layer 172. Photon 137 interacts with a color conversion material Lenght of

<img file="MX341876B_D0026.tif" />

„ΙΜΡΙ

MEXICAN INSTITUTE

OF THE PROPERTY

INDUSTRIAL waves in the color conversion layer 172, and is converted to a lambertian emission of the converted color light (eg, red light). By minimizing the content of green light emitting phosphor in color conversion layer 172, it increases the probability that the reflected red light back is once again reflected back to output window 108 without being reabsorbed.

In another embodiment, the LEDs 102 located in zone 2 of figure 8 are ultraviolet emitting LEDs, while the LEDs 102 located in zone 1 of figure 8 are blue light emitting LEDs. The color conversion layer 172 includes either a yellow light emitting phosphor and a green light emitting phosphor. Color conversion layer 135 includes a red light emitting phosphor. The yellow and / or green light emitting luminophores that are included in the side wall 107 are selected to have narrowband absorption spectra centered near the emission spectrum of the blue zone 1 LEDs, but far from the spectrum. of emission of the ultraviolet LEDs in zone 2. In this way, the light emitted from the LEDs in zone 2 is preferentially directed to exit window 108, and undergoes conversion to red light. Furthermore, any amount of light emitted from the ultraviolet LEDs that illuminates the side wall 107 results in very little color conversion due to the intensity of these luminophores in ultraviolet light. In this way the contribution of the light emitted from the LEDs in zone 2 for the combined light 141 is almost entirely red light. In this way, the amount of contribution of red light to the combined light 141 can be influenced by the current supplied to the

<img file="MX341876B_D0027.tif" />

<img file="MX341876B_D0028.tif" />

INSTITUTE )

OF THE PXOP / INDUSTRIAL AGE

LEDs in zone 2. The light emitted from the blue LEDs located in zone 1 is preferentially directed to the side wall 107, and results in the conversion to green and / or yellow light. In this way the contribution of the light emitted from the LEDs in zone 1 for the combined light 141 is a combination of blue and yellow and / or green light. Thus, the amount of contribution of blue and yellow and / or green light in the combined light 141 can be influenced by the current supplied to the LEDs in zone 1.

To emulate the desired dimming characteristics that are illustrated by line 202 of Figure 6, the LEDs in zones 1 and 2 can be independently Controlled. For example, at 2626.8 ° C, the LEDs in zone 1 can operate at maximum current levels, without supplying current to the LEDs in zone 2. To reduce the color temperature, the current supplied to the LEDs in zone 1 can be reduced, while the current supplied to the LEDs in zone 2 can be increased. Since the number of LEDs in zone 2 is less than the number in zone 1, the total relative flux of the LED-based Lighting module 100 is reduced. As the LEDs in zone 2 contribute red light to the combined light 141, the contri relative contribution of red light to the combined light increases 141. As indicated in Figure 7, this is necessary to achieve the desired reduction in CCT. At 1626.8 ° C, the current supplied to the

LEDs in zone 1 are reduced to a very low or zero level, and the dominant contribution to the combined light comes from the LEDs in zone 2. To further reduce the output flux of the LED 100-based lighting module,

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LEDs in zone 2. For this reason, when the current supplied to the LEDs in zone 2 is reduced, the color temperature remains more or less constant (1626.8 ° C in this example).

Fig. 9 is illustrative of a top view of the LED-based lighting module 100 depicted in Fig. 8. Section A depicted in Fig. 9 is the cross-sectional view depicted in Fig. 8. As shown, in this embodiment. , the LED-based lighting module 100 is circular in shape as illustrated in the exemplary configurations depicted in Figures 2 and 3. In this embodiment, the LED-based lighting module 100 is divided into annular zones (eg zone 1 and zone 2) including different 15 groups of LEDs 102. As illustrated, zones 1 and zones 2 are separated and defined by their relative proximity to the side wall 107. However, although the LED-based lighting module 100, depicted in Figures 8 and 9, is circular in shape, other shapes can be envisaged.

For example, the LED-based lighting module 100 may be polygonal in shape. In other modalities, the lighting module based on

LED 100 can have any other closed shape (for example, elliptical, etc.). Similarly, other shapes can be envisioned for any of the areas of the LED-based lighting module 100.

As shown in figure 9, the lighting module

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INDUSTRIAL based on LED 100 is divided into two zones. But you can see more areas. For example, as depicted in Figure 10, the

Lighting based on LED 100 is divided into five zones. Zones 1-4 subdivide to side wall 107 on several different color conversion surfaces. In this way the light emitted from LEDs 1021 and 102J in zone 1 is directed preferentially to the color conversion surface 221 of side wall 107, the light emitted from LEDs 102B and 102E in zone 2 is directed preferentially to the color conversion surface 220 of the side wall 107, the light emitted from the LEDs 102F and 102G in zone 3 is directed preferably to the color conversion surface 223 of the side wall 107, and the light emitted from LEDs 102A and 102H in zone 4 is preferably directed to color conversion surface 222 of side wall 107. The five zone configuration shown in FIG.

10 it is provided by way of example. But you can see many other numbers and combinations of zones.

In one embodiment, zones 221 and 223 of the color conversion surfaces in zones 1 and 3, respectively, may include a densely packed yellow and / or green light emitting lumophore, while color conversion surfaces 220 and 222 in zones 2 and 4, respectively, may include a sparsely packed yellow and / or green light emitting phosphor. In this way, the blue light emitted by the LEDs in zones 1 and 3 can be almost completely converted to yellow and / or

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INDUSTRIAL green, while the blue light emitted by the LEDs in zones 2 and 4 can only be partially converted to yellow and / or green light. In this way, the amount of the blue light contribution to the combined light 141 can be controlled by independent control of the current supplied to the LEDs in zones 1 and 3 and to the LEDs in zones 2 and 4. More specifically, if a relatively large contribution of blue light to the combined light 141 is desired, a large current can be supplied to the LEDs in zones 2 and 4, while minimizing the current supplied to the LEDs in zones 1 and 3. However, if a relatively small contribution of blue light is desired, only a limited current can be supplied to the LEDs in zones 2 and 4, while a large current is supplied to the LEDs in zones 1 and 3. In this way, the relative contributions of blue light and yellow and / or green light to the combined light 141 can be independently controlled. This can be useful in tailoring the light output generated by the LED-based lighting module to match a desired dimming characteristic (eg line 202). The aforementioned modality is provided as an example. Other combinations of different independently controlled LED zones can be envisioned which preferentially illuminate different color conversion surfaces, for a desired dimming characteristic.

In some embodiments, the locations of LEDs 102 within LED-based lighting module 100 are selected in a manner

MEXICAN INSTITUTE Say THE PROPERTY

ItíUUJTRlAL - __ that uniform light emission properties of the combined light are achieved

141. In some embodiments, the location of LEDs 102 may be symmetrical about an axis in the mounting plane of LEDs 102 of the LED-based Lighting module 100. In some embodiments, the location of LEDs 102 may be symmetrical about an axis perpendicular to the mounting plane of LEDs 102. The light emitted from some LEDs 102 is preferentially directed towards one interior surface or to several interior surfaces, and the light emitted from some other LEDs 102 is preferentially directed towards another interior surface or to several interior surfaces of the color conversion cavity 160. The proximity of the LEDs 102 to the side wall 107 can be selected in such a way as to promote efficient light extraction from the color conversion cavity 160 and uniform light-emitting properties of the combined light 141. In such embodiments, the Light emitted from LEDs 102 that are closest to side wall 107 is directed preferentially toward side wall 107. However, in some embodiments, the light emitted from the LEDs that are close to the side wall 107 may be directed toward the exit window 108 to avoid an excessive amount of color conversion due to Interaction with the side wall 107. Conversely, in some other embodiments, light emitted from LEDs distant from side wall 107 may be preferentially directed toward side wall 107 when additional color conversion is necessary due to interaction with the side wall.

107.

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX341876B_D0029.tif" />

Figure 11 is illustrative of a cross section of the LED-based lighting module 100 in another embodiment. In the illustrated embodiment, the side walls 107 are arranged at an oblique angle, a, with respect to the mounting board 104. In this way, a higher percentage of light emitted from the LEDs in preferential zone 1 (for example, the LEDs 102A and 102B) directly illuminate the side wall 107. In some embodiments, more than fifty percent of the light output from LEDs 102A and 102B is directed toward side wall 107. For example, as illustrated in Figure 11, the LEDs in zone 1 (eg, the LEDs 102A) are located at a distance, D, from side wall 107. Additionally, side wall 107 extends at a distance, H, from mounting board 104 to exit window 108. Assuming that LED 102A exhibits an axi-symmetric output beam distribution and the oblique angle, a, it is chosen as follows:

a &lt;tan (1) then more than fifty percent of the light output from the LEDs in zone 1 is directed toward the side wall 107. In some other embodiments, the oblique angle, a, is selected such that more seventy-five percent of the light output from the LEDs in zone 1 is directed toward the side wall 107. In some other embodiments, the oblique angle, a, is selected such that more than ninety percent of the light output from the LEDs in zone 1 is directed toward the side wall 107.

MEXICAN INSTITUTE j

OF THE PROPERTY

INDUSTRIAL _

Figure 12 is illustrative of a cross section of the LED based lighting module 100 in another embodiment. In the illustrated embodiment, LEDs 102 that are located in preferential zone 1 (for example, LEDs 102A and 102B) are mounted at an oblique angle, β, with respect to the

LEDs in preferential zone 2. Thus, a higher percentage of light emitted from the LEDs in preferential zone 1 directly illuminates the side wall 107. In the illustrated embodiment, an angled mounting bearing 161 is used to mount the LEDs in preferential zone 1 at an oblique angle to mounting board 104. In another example (not shown), LEDs in Preferred Zone 1 can be mounted on a three-dimensional mounting board that includes a mounting surface (s) for LEDs in Preferred Zone 1 oriented at an angle oblique to a mounting surface (s) for the LEDs in preferential zone 2. In yet another example, mounting board 104 may be deformed after LEDs 102 have been positioned so that the LEDs in Preferred Zone 1 are oriented obliquely to the LEDs in Preferred Zone 2. Still in In another embodiment, the LEDs in Preferred Zone 1 can be mounted on a separate mounting board. The mounting board that includes the LEDs in preferential zone 1 can be oriented at an oblique angle with respect to the mounting board that includes the LEDs in preferential zone 2. Other modalities can be contemplated. In some embodiments, the oblique angle, β, is selected such that more than fifty percent of the light output from LEDs 102A and 102B

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is directed toward the side wall 107. In some embodiments, the oblique angle, β, is selected such that more than seventy-five percent of the light output from LEDs 102A and 102B is directed toward the side wall 107. In some embodiments, the oblique angle, β, is selected such that more than ninety percent of the light output from LEDs 102A and 102B is directed toward side wall 107.

Figure 13 is illustrative of a cross section of the LED-based lighting module 100 in another embodiment. In the illustrated embodiment, a transmitter element 162 is arranged above and separate from the

LEDs 102A and 102B. As illustrated, transmitter element 162 is located between LED 102A and output window 108. In some embodiments, transmitter element 162 includes the same wavelength conversion material as the material included in side wall 107. In the aforementioned embodiment, the blue light emitted by the LEDs in preferential zone 1 is preferentially directed towards the side wall 107 and interacts with the red phosphor which is located in the color conversion layer 172 to generate red light. To increase the conversion of blue light to red light, a transmitter element 162 can be provided that includes the red phosphor of the color conversion layer 172, above any of the LEDs that are located in preferential zone 1. In this manner , the light emitted from any of the LEDs that are located in the preferential zone 1 is directed preferentially towards the transmitting element 162. Additionally, the light emitted from the transmitting element 162 can be directed h ','

IMPI Ms.ocAxa INSTITUTE OF LA; ui INDUSTRIAL preferably towards side wall 107 for additional red light pmw.

In some embodiments, a transmitter element 163 that includes a yellow and / or green phosphor can also be disposed above any of the LEDs that are located in preferential zone 2. In this way, the light emitted from any of the LEDs that is located in preferential zone 2, it is more prone to undergo color conversion before exiting LED-based lighting module 100 as part of combined light 141.

In some other embodiments, the transmitter element 162 includes a wavelength conversion material different from the wavelength conversion materials included in the side wall 107 and the outlet window 108. In some embodiments, an element can be located Transmitter 162 above some of the LEDs in any of Preferred Zones 1 and 2. In some embodiments, transmitter element 162 is a dome-shaped element arranged on a single LED 102. In some other embodiments, transmitter element 162 is a configured element disposed on some of LEDs 102 (eg, a bisected toroidal shape disposed above LEDs 102 in preferential area 1 of a shaped LED-based lighting module 100 circular, or a linearly extending shape arranged above some of the LEDs 102 that are arranged in a linear pattern).

<img file="MX341876B_D0032.tif" />

MEXICAN INSTITUTE OF PROPERTY

INDUSTRIAL

<img file="MX341876B_D0033.tif" />

In some embodiments, the shape of the transmitting element 162 disposed above the LEDs 102 that are located in the preferential zone 1, is different from the shape of a transmitting element 162 disposed above the LEDs 102 that are located in the preferential zone 2.

For example, the shape of the transmitter element 162 arranged above the LEDs 102 that are located in the preferential zone 1, is selected in such a way that the light emitted from the LEDs that are located in the preferential zone 1 preferentially illuminates the side wall 107 . In some embodiments, transmitter element 162 is selected such that more than fifty percent of the light output from LEDs located in preferential zone 1 is directed toward side wall 107. In some other embodiments, the element Transmitter 162 is selected such that more than seventy-five percent of the light output from the LEDs located in preferential zone 1 is directed towards side wall 107. In some other embodiments, transmitter element 162 is selected such that more than ninety percent of the light output from LEDs located in preferential zone 1 is directed toward the side wall

107.

Likewise, any transmitter element arranged above 20 of the LEDs 102 that are located in the preferential zone 2, has such a shape to preferentially illuminate the output window 108. In some embodiments, the transmitter element 163 is selected in such a way that more than fifty percent of the light output from the located LEDs

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Figure 14 is illustrative of a cross section of the LED-based lighting module 100 in another embodiment. In the illustrated embodiment, an interior surface 166 extends from mounting board 104 to exit window 108. In some embodiments, the height, H, of surface 166 is determined such that at least fifty percent of the light emitted by the LEDs in preferential zone 1 directly illuminates the side wall 107 or the inner surface 166. In some other embodiments, the height, H, of the interior surface 166 is determined such that at least seventy-five percent of the light emitted by the LEDs in preferential zone 1 directly illuminates the side wall 107 or the surface interior 166. In some other embodiments, the height, H, of the interior surface 166 is determined such that at least ninety percent of the light emitted by the LEDs in preferential zone 1 directly illuminates the side wall 107 or interior surface 166 .

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In some embodiments, interior surface 166 includes a

MEXICAN INSTITUTE OF PROPERTY

INDUSTRIAL

<img file="MX341876B_D0034.tif" />

reflective surface 167 and a color conversion layer 168. In the illustrated embodiment, the color conversion layer 168 is located on the side of the reflective surface 167 that faces the side wall 107.

Additionally, the color conversion layer 168 includes the same wavelength conversion material that is included in the color conversion layer 172 of the side wall 107. In this way, the light emitted from the LEDs that are located in Preferential area 1 is preferentially directed to side wall 107 and inner surface 166 for improved color conversion. In some other embodiments, the color conversion layer 168 includes a different wavelength conversion material than that which is included in the color conversion layer 172.

Figure 15 illustrates an example of a side-emitting LED 100 based lighting module that preferentially directs light emitted from LEDs 102A and 102B toward side wall 107 and preferentially directs light emitted from LEDs 102C and 102D toward the upper wall 173. In the side emission modes, the combined light 141 is emitted from the LED-based lighting module 100 through the transmit side wall 107. In some embodiments, the top wall 173 20 is reflective and is configured to direct light toward the side wall 107.

FIG. 16 is illustrative of a cross-sectional side view of an LED-based lighting module 100 in one embodiment. As illustrated, the 100 LED-based lighting module

<img file="MX341876B_D0035.tif" />

<img file="MX341876B_D0036.tif" />

MEXICAN INSTITUTE OF THE FXCf^&gt;} fc'j) AD INDUSTRIAL includes a plurality of LEDs 102A-102D, a side wall 107, and an exit window 108. Side wall 107 includes a reflective layer 171 and a color conversion layer 172. The color conversion layer Color 172 includes a wavelength conversion material (eg, a red light emitting phosphor). The output window 108 includes a transmitter layer 134 and a color conversion layer 135. The color conversion layer 135 includes a wavelength conversion material with a different color conversion property from the wavelength conversion material included in the side wall 107 (eg, a yellow light emitting phosphor). The LED-based lighting module 100 also includes a transmitter element 190 arranged above the LEDs 102A-102D. As shown, the transmitter element 190 is physically separated from the light emitting surfaces of LEDs 102. However, in some other embodiments, the transmitter element 190 is physically coupled to the light emitting surfaces of LEDs 102 by a optically transmitting medium (eg Silicon, optical adhesive, etc.). As depicted, the element / transmitter 190 is a plate of an optically transmitting material (eg, glass, sapphire, alumina, polycarbonate, and other plastics, etc.). However, another form can also be contemplated.

As shown in Figure 16, the color conversion cavity 160 is formed by the interior surfaces of the LED-based lighting module 100, including the interior surface of the side wall 107, the interior surface of the exit window 108, and the transmitting element 190. Therefore,

IMPI

INSTITUTO MEXICANO C £ LA FKÜFIEDAlj INDUSTRIAL LEDs 102 are physically separated from color conversion cavity 160. By separating wavelength conversion materials from LEDs 102, the heat from LEDs 102 to the conversion materials decreases. wavelength. As a result, the wavelength conversion materials are kept at a low temperature during operation. This increases the reliability and color maintenance of the 100 LED based lighting fixture.

In some embodiments, the color conversion layers 172 and 135 are not included in the LED-based lighting fixture 100. In these embodiments, virtually all color conversion is accomplished by the luminophores Included with the transmitting element 190.

Transmitter element 190 includes a first surface area with a first wavelength conversion material 191 and a second surface area with a second wavelength conversion material 192. Wavelength conversion materials 191 and 192 they can be arranged in the transmitter element 190, or they can be embedded in the transmitter element 190. Additional wavelength conversion materials may also be included as part of transmitter element 190. For example, additional surface areas of transmitter element 190 may include additional wavelength conversion materials. In some examples, different wavelength conversion materials can be laminated into transmitter element 190. As shown in Figure 16, the wavelength conversion material 190

<img file="MX341876B_D0037.tif" />

<img file="MX341876B_D0038.tif" />

₄₂ IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY onda 191 is a red emitting luminophore that is preferably illuminated by LEDs 102A and 102B. Additionally, the wavelength conversion material 192 is a yellow emitting phosphor which is preferentially illuminated by LEDs 102C and 102D.

LEDs 102A-102D LED-Based Lighting Module

100 they emit light directly into the 160 color conversion cavity.

The light is mixed and its color is converted within the color conversion cavity 160, and the resulting combined light 141 is emitted by the LED-based lighting module 100. A different current source supplies current to LEDs 102 in different preferential zones. In the example depicted in FIG. 16, current source 182 supplies current 185 to LEDs 102A and 102B that are located in preferential zone 1. Similarly, current source 183 supplies current 184 to LEDs

102C and 102D that are located in the preferential zone 2. By separately controlling the current supplied to the LEDs that are located in different preferential zones, the correlative color temperatures (CCT) of the combined light 141 emitted by the lighting module based In LED, it can be adjusted over a wide range of CCT. In some embodiments, the LEDs 102 of the LED-based lighting device emit light with a peak emission wavelength of five nanometers from each other. For example, LEDs 102A-D all emit blue light with a peak emission wavelength of five nanometers from each other. In this way, the white light emitted by the LED-based lighting device 100 is largely generated

<img file="MX341876B_D0039.tif" />

by wavelength conversion materials. In this way, color control is based on the arrangement of different wavelength conversion materials that will be preferentially illuminated by different subsets of LEDs.

Figure 17 illustrates a top view of the LED-based Lighting module 100 depicted in Figure 16. Figure 16 depicts a cross-sectional view of the LED-based lighting module 100 along section line, B, shown in figure 17. As illustrated in Figure 17, the wavelength conversion material 191 covers a portion of the transmitter element 190 and the wavelength conversion material 192 covers another portion of the transmitter element 190. The LEDs in zone 2 ( including LEDs 102A and 102B) preferentially illuminate wavelength conversion material 191. In a simulative way, the LEDs in zone 1 (including LEDs 102C and 102D) preferentially illuminate the wavelength conversion material 192. In some embodiments, more than fifty percent of the light output of the LEDs in zone 1 is directed towards the wavelength conversion material 191, while more than fifty percent of the light output from the LEDs in zone 2 is directed towards the wavelength conversion material 192. In some other modes, more than seventy-five percent of the light output from the LEDs in zone 1 is directed toward the wavelength conversion material 191, while more than seventy-five percent of the output from LED light in zone 2 is directed towards the material ”Ό MEXICANO and. ·. 'AOFIEDaIJ • OU5TKIAL *&gt; ·· wavelength conversion 192. In some other embodiments, more than ninety percent of the light output from the LEDs in zone 1 is directed toward the 191 wavelength conversion material, while more than ninety percent of the light output from the LEDs in zone 2 it is directed towards the wavelength conversion material 192.

In one embodiment, the light emitted by the LEDs located in the preferential zone 1 is directed towards the wavelength conversion material 191 which includes a mixture of light-emitting materials that emit red and yellow light. When the current source 182 supplies current 185 to the LEDs in preferential zone 1, the emitted light 141 is a light with a correlative color temperature (CCT) of less than 7226.85 ° C. In some other examples, the emitted light has a CCT of less than 4726.85 ° C. In some embodiments, the emitted light has a color dot within a degree of separation Axy of 0.010 from a target color point in the CIE 1931 x diagram created by the International Commission on Illumination (CIE) in 1931. Thus, when current is supplied to the LEDs in Preferred Zone 1 and substantially no current is supplied to the LEDs in Preferred Zone 2, the combined light output 141 of the LED-based lighting module 100 is a white light that complies with with a specific color point target (for example, within an Axy separation degree of 0.010 within 2726.85 ° C at the Planck site). In some embodiments, the light output has a color point within a degree Axy of 0.004 from a target color point in the

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX341876B_D0040.tif" />

CIE 1931 xy diagram. In this way there is no need to adapt the multiple currents supplied to the different LEDs of the LED 100 based lighting device to achieve a white light output that meets the specified color point objective.

Wavelength conversion material 192 includes a phosphor material that emits red light. Current source 183 supplies current 184 to LEDs in preferential zone 2, the light output has a relatively low CCT. In some other examples, the light output has a CCT of less than 1926.85 ° C. In some other examples, the light output has a CCT of less than 1726.85 ° C. In some other examples, the light output has a CCT of less than 1526.85 ° C. Thus, when current is supplied to the LEDs in preferred zone 2 and substantially no current is supplied to the LEDs in preferred zone 1, the combined light output 141 of the LED-based lighting system 100 is a colored light very warm. By adjusting the current 185 supplied to the LEDs located in zone 1, relative to the current 184 supplied to the LEDs located in zone 2, the amount of white light can be adjusted relative to colored light included in the combined light 141. Thus, the control of currents 184 and 185 can be used to adjust the CCT of the light emitted from the LED-based lighting module 100 from a relatively high CCT to a relatively low CCT. In some examples, the control of currents 184 and 185 can be used to adjust the CCT of the light emitted from the lighting module based on

<img file="MX341876B_D0041.tif" />

LED 100, from a white light of at least 2426.8 ° C to a warm light of less than 1526.85 ° C). In some other examples a warm light of less than 1426.8 ° C is achieved.

Figure 18 illustrates a top view of an LED-based lighting module 100 in another embodiment. Figure 19 depicts a cross-sectional view of the LED-based lighting device 100 along section line, C, shown in Figure 18. As illustrated in Figure 18, the wavelength conversion material 191 covers a portion of the transmitter element 190 and is preferentially illuminated by the LEDs of zone 1. Wavelength conversion material 192 covers another portion of transmitter element 190 and is preferentially illuminated by zone 2 LEDs. LEDs in zone 3 do not preferentially illuminate any of wavelength conversion materials 191 or 192 The LEDs in zone 3 preferentially illuminate the wavelength conversion materials present in the color conversion layers 135 and 172. In this embodiment, the color conversion layer 172 includes a red light emitting phosphor material and the color conversion layer 135 includes a yellow light emitting phosphor material. However, other combinations of luminophores can be envisaged. In some other modes, the color conversion layers 135 and 172 are not implemented. In these modes, the color conversion is done by the wavelength conversion materials that are included in the element

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transmitter 190, instead of the side walls 107 or the exit window

108.

Figure 20 illustrates a range of color dots that can be achieved by the LED-based lighting device 100 depicted in the figures.

18 and 19. When power is supplied to the LEDs in zone 3, the light 141 emitted by the LED-based lighting device 100 has a color dot 231 illustrated in Figure 20. The light emitted by the LED-based lighting device 100 has a color point within an Axy separation degree of 0.010 on the CIE 1931 x diagram and from a target color point of less than 4726.85 ° C at the Planck site, when power is supplied to the LEDs in zone 3 and no current is substantially supplied to the LEDs in zones 1 and 2. The current source 183 supplies current 184 to the LEDs in preferential zone 1, the light emitted from the LED-based lighting device 100 has a color dot 232. The light emitted from the LED-based lighting device 100 has a colored dot below Planck's place on the CIE 1931 x diagram and with a CCT of less than 1526.85 ° C when power is supplied to the LEDs in zone 1 and substantially no current is supplied to the LEDs in zones 2 and 3. Current source 182 supplies current 184 to the

LED in preferential zone 2, the light emitted from the LED-based lighting device 100 has a color dot 233. The light emitted from the LED-based lighting device 100 has a color dot above the Planck location 230 in the CIE 1931 xy 240 diagram with

<img file="MX341876B_D0043.tif" />

a CCT of less than 2726.85 ° C when power is supplied to the LEDs in zone 2 and substantially no current is supplied to the LEDs in zones 1 and 3.

By adjusting the currents supplied to the LEDs located in zones 1, 2 and 3, the light 141 emitted from the LED-based lighting module 100 can be tuned to any color point within a triangle connecting the points of color 231-233 illustrated in figure 20. In this way, light 141 emitted from LED-based lighting module 100 can be tuned to achieve any CCT from a relatively high CCT (eg, about 2726.85 ° C) to a relatively low CCT (eg, less 1526.85 ° C).

As illustrated in Figure 6, the line in Figure 203 exhibits an achievable relationship between CCT and relative flow for the mode illustrated in Figures 18-19. As illustrated in Figure 6, it is possible to reduce the CCT of the light emitted from the LED-based lighting device 100 from 2726.85 ° C to approximately 1926.85 ° C without loss of flux. Additional reductions in CCT can be obtained from 1926.85 ° C to approximately 1476.85 ° C with an approximately linear reduction in relative flow from 100% to 55%. The relative flux can be further reduced without any change in the CCT, by reducing the current supplied to the LEDs of the LED-based lighting fixture 100. Graph line 203 is presented as an example to illustrate that LED-based lighting device 100 can be configured to achieve changes; Λ

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INDUSTRIAL relatively large in CCT, with relatively small changes in flow levels (for example, a relative flow of 55-100% is shown in line 203) and also to achieve relatively large changes in flow level with relatively small changes in CCT (for example, as illustrated in line 203 a relative flow of 0-55%). However many other dimming characteristics can be achieved by reconfiguring both the relative and absolute currents that are supplied to the LEDs in different preferential zones.

The aforementioned modality is provided as an example.

Other combinations of different independently controlled LED zones can be envisioned which preferentially illuminate different color conversion surfaces, for a desired dimming characteristic.

In some embodiments, the components of the color conversion cavity 160, including the angled mounting bearing 161, may be constructed from or include a PTFE material. In some examples the component may include a PTFE layer coated by a reflective layer such as a polished metal layer. The PTFE material may be made of sintered PTFE particles. In some embodiments, portions of any of the opposing interior surfaces of the color conversion cavity 160 can be constructed from a PTFE material. In some embodiments, the PTFE material can be coated with a wavelength conversion material. In other modalities, a

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In other embodiments, the components of the color conversion cavity 160 may be constructed from or include a reflective, ceramic material, such as the ceramic material produced by CerFlex International (The Netherlands). In some embodiments, portions of any of the interior opposing surfaces of the color conversion cavity 160 can be constructed from a ceramic material. In some embodiments, the ceramic material can be coated with a wavelength conversion material.

In other embodiments, the components of the color conversion cavity 160 can be constructed from or include a reflective, metallic material, such as aluminum or Miro® produced by Alanod (Germany). In some embodiments, portions of any of the interior opposing surfaces of the color conversion cavity 160 can be constructed from a reflective, metallic material. In some embodiments, the metallic reflective material can be coated with a wavelength conversion material.

In other embodiments, the components of the color conversion cavity 160 may be constructed from or include a reflective plastic material, such as Vikuiti ™ ESR, sold by 3M (USA), Lumirror ™ E60L manufactured by Toray (Japan), or microcrystalline polyethylene terephthalate (MCPET) such as that manufactured by Furukawa Electric Co. Ltd.

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INDUSTRIAL (Japan). In some embodiments, portions of any of the interior opposing surfaces of the color conversion cavity 160 can be constructed from a reflective, plastic material. In some embodiments, the reflective material, plastic, can be coated with a wavelength conversion material.

Cavity 160 can be filled with a non-solid material, such as air or an inert gas, so that LEDs 102 emit light into the non-solid material. As an example, the cavity can be hermetically sealed and Argon gas can be used to fill the cavity. Alternatively, nitrogen can be used. In other embodiments, cavity 160 can be filled with a solid encapsulating material. As an example, Silicon can be used to fill the cavity. In some other embodiments, the color conversion cavity 160 may be filled with a fluid to promote heat removal from the LEDs 102. In some embodiments, the wavelength conversion material may be included in the fluid to achieve Color conversion across the entire volume of the 160 color conversion cavity.

PTFE material is less reflective than other materials that can be used to build or include them in the components of the 160 color conversion cavity, such as the Miro® produced by Alanod. In one example, the blue light output of a lighting module 100 constructed with an uncoated Miro® sidewall insert 107 was compared to the same module constructed with a non-PTFE sidewall insert.

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Coated 107, constructed from a sintered PTFE material manufactured by Berghof (Germany). The blue light output of module 100 decreased by 7% from the use of a PTFE side wall insert. Similarly, the blue light output of module 100 decreased by 5% compared to the Miro® 107 uncoated side wall insert by the use of a PTFE 107 side wall insert constructed from a sintered PTFE material. , manufactured by WL Gore (USA). The light extraction from module 100 is directly related to the reflectivity within cavity 160, and therefore the Lower reflectivity of the PTFE material, compared to other available reflective materials, would deviate from the use of the PTFE material in the cavity 160. However, the inventors determined that when the PTFE material is phosphor coated, the PTFE material unexpectedly produces an increase in light output compared to other more reflective materials, such as

Miro®, with a similar phosphor coating. In another example, the white light output of a lighting module 100 directed at a correlative color temperature (CCT) of 3726.85 ° C constructed with a phosphor-coated Miro® 107 side wall insert was compared to the same module Constructed with a phosphor-coated PTFE 107 side wall insert, constructed from a sintered PTFE material manufactured by Berghof (Germany). The white light output of module 100 increased by 7% with the use of a phosphor-coated PTFE side wall insert, compared to the phosphor-coated Miro®. Similarly, the white light output

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INDUSTRIAL module 100 increased by 14% compared to the phosphor-coated Miro® sidewall insert 107 with the use of a PTFE sidewall insert 107 constructed of sintered PTFE material, manufactured by WL Gore (USA) . In another example, the white light output of a lighting module 100 directed at a correlative color temperature (CCT) of 2726.85 ° C constructed with a phosphor-coated Miro® 107 side wall insert was compared to the same module Constructed with a phosphor-coated PTFE 107 side wall insert, constructed from a sintered PTFE material manufactured by Berghof (Germany). The white light output of module 100 increased by 10% with the use of a phosphor-coated PTFE sidewall insert, compared to the phosphor-coated Miro®. Similarly, the white light output of module 100 increased by 12% compared to the phosphor-coated Miro® side wall insert 107 with the use of a PTFE Side Wall Insert 107 constructed of sintered PTFE material. , manufactured by WL Gore (USA).

Thus, it was discovered that, despite being less reflective, it is desirable to construct phosphor-covered portions of the light combining cavity 160 with a PTFE material. Furthermore, the inventors also discovered that the phosphor-coated PTFE material has better durability when exposed to the heat of LEDs, for example in a light combining cavity 160, compared to other more reflective materials such as Miro ®, with a similar phosphor coating.

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Although certain specific embodiments were described above for instructional purposes, the teachings of this patent document have general applicability and are not limited to the specific embodiments described above. For example, a pattern with phosphor can be formed in any component of the conversion cavity 160. Both the pattern itself and the composition of the phosphor can vary. In one embodiment, the lighting device may include different types of luminophores that are located in different areas of the light combining cavity 160.

For example, a red phosphor may be located on either or both of the insert 107 and the lower reflector insert 106, and the yellow and green phosphors may be located on the upper or lower surfaces of the output window 108 or embedded within the exit window 108. In one embodiment, different types of luminophores, eg, red and green, can be located over different areas on the side walls 107. For example, one type of phosphor can form a pattern on side wall insert 107 in a first area, for example, in strips, dots, or other patterns, while another type of phosphor is located in a second different area of ​​insert 107 If desired, additional luminophores can be used and located in different areas of cavity 160. Additionally, if desired, only a single type of wavelength conversion material can be used and patterned in cavity 160, eg, on the side walls. In another example, cavity body 105 is used to attach mounting board 104 directly to mounting base 101 without the use of the locking ring.

<img file="MX341876B_D0046.tif" />

<img file="MX341876B_D0047.tif" />

<img file="MX341876B_D0048.tif" />

Retaining Mounting Board 103. In other examples, mounting base 101 and heat diffuser 120 may be a single component. In another example, the LED-based lighting module 100 is shown in Figures 1-3 as part of a luminaire 150. As illustrated in Figure 3, an LED-based lighting module 100 may be a part of a lamp replacement or retraining lamp. But, in another embodiment, the LED-based lighting module 100 can be formed as a replacement lamp or a conversion lamp and can be considered as such. Accordingly, various modifications, adaptations, and combinations of various features of the disclosed embodiments can be practiced without departing from the scope of the invention as set forth in the claims.

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