White led light source module

The present invention relates to a white LED light source module having a white LED light source by combining a blue LED element and a phosphor, and more specifically, the phosphor when it is not functioning as a light source (light source for illumination or light source for display). It relates to a white LED light source module having a means for not showing the color as it is.

When white light is obtained by combining an LED element and a phosphor, the yellow phosphor that excites the blue LED element that emits blue light and converts the wavelength into yellow light that is the complementary color of the blue light is translucent. A part of the blue light emitted from the blue LED element and a part of the blue light emitted from the blue LED element excite the yellow phosphor by encapsulating the resin with a sealing resin dispersed in the resin. Light with a color tone close to white light can be formed by additive color mixing with the converted yellow light.

Further, instead of the yellow phosphor, a mixed phosphor of a green phosphor that is excited by blue light and converts the wavelength into green light and a red phosphor that converts the wavelength into red light is used, and the mixed phosphor is a translucent resin. By sealing the resin with a sealing resin dispersed in, a part of the blue light emitted from the blue LED element and a part of the blue light emitted from the blue LED element excite the green phosphor. White light can also be formed by additive color mixing of wavelength-converted green light and wavelength-converted red light by excites a part of blue light emitted from a blue LED element to excite a red phosphor.

In any of the above cases, the phosphor when the LED element is not lit is excited by light in the ultraviolet to blue wavelength region contained in external light consisting of natural light such as sunlight or artificial light such as a light bulb or fluorescent lamp. It emits weak fluorescence. Therefore, when observing the sealing resin in which the LED element is sealed when the LED element is not lit, the sealing resin in which the yellow phosphor is dispersed looks yellowish, and the mixed fluorescence of the green phosphor and the red phosphor is mixed. The body-dispersed sealing resin looks orangeish.

Therefore, when the white LED light source having the above configuration is used in combination with an optical element such as a reflector or a lens, the sealing resin is optically enlarged by the optical element and the phosphor color when not lit becomes conspicuous. , The appearance of the entire optical system is impaired.

In order to solve such a problem, for example, by providing a white light diffusing layer on the surface of the sealing resin or providing a white light diffusing plate in front of the sealing resin, natural light or artificial light from the outside is provided. It is conceivable to block the excitation light due to the above and suppress the pseudo lighting of the phosphor, thereby improving the appearance of the entire optical system.

However, this method has a problem that the light emitted from the LED element is scattered or absorbed by the light diffusing layer or the light diffusing plate to cause light loss, and the irradiation light amount and the axial luminous intensity are lowered. Further, the light diffusing layer or the light diffusing plate has optical characteristics such that it easily absorbs light in a short wavelength region of visible light, and the irradiation light may become light whose wavelength is shifted by the light diffusing layer or the light diffusing plate. ..

Therefore, as a method of making the phosphor color inconspicuous without causing such a problem, a minute standby current is passed through the LED element even when it is not functioning as a light source, and the phosphor is excited by a minute excitation light. However, it has been proposed to make the phosphor color invisible with a minute amount of white light (see, for example, Patent Document 1).

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2006-251396</text></patcit></p>

<p> By the way, according to the above proposal, the current value of the standby current flowing through the LED element is controlled by a drive signal based on the brightness of the external light detected by the external light sensor, thereby reducing the power consumption. The specific configuration and functions related to the positional relationship between the LED and the external light sensor and the relationship between the brightness of the LED light source and the brightness of the external light are not clear, and the specificity is poor.</p><p> Therefore, the present invention has been devised in view of the above problems, and an object of the present invention is to provide a light source (light source for illumination or a light source for illumination) in a white LED light source module having a white LED light source by combining a blue LED element and a phosphor. It is an object of the present invention to provide a white LED light source module provided with a means for preventing the appearance of the phosphor color from being spoiled by showing the phosphor color as it is when it is not functioning as a display light source).</p>

<p> In order to solve the above problems, the invention described in claim 1 of the present invention is a white LED light source module including a white LED light source and a photosensor, and the white LED light source module is a mounting base. The LED element is translucent in a space partitioned by an outer wall having an opening above the mounting base and a transparent cover provided so as to close the opening of the outer wall. The irradiation direction of the white LED light source, which is sealed with a sealing resin in which a phosphor is mixed with the resin, and the light receiving direction of the first photosensor are arranged side by side with substantially the same direction. The white color is obtained by driving the LED element with a control current from the LED drive current control means that has received the detection signal from the first photosensor that has detected the brightness of the external light during standby when it is not used as a light source. The feature is that the brightness of the LED light source is made to be substantially equal to the brightness of the external light.</p><p> Further, according to the second aspect of the present invention, in the first aspect, the light receiving surface of the second photosensor is arranged in the vicinity of the transparent cover so that the light receiving surface of the second photo sensor faces the white LED light source side, and the external light is emitted. The comparison difference by the signal comparison means for comparing the detection signal from the first photosensor that detected the brightness and the detection signal from the second photosensor that detected the brightness of the white LED light source is zero. By driving the LED element with a control current from the LED drive current control means, the brightness of the white LED light source is made substantially equal to the brightness of the outside light. It is a thing.</p><p> The invention described in claim 3 of the present invention is characterized in that, in claim 1 or 2, both the first photosensor and the second photosensor are photodiodes. Is.</p><p> Further, in the invention described in claim 4 of the present invention, in any one of claims 1 to 3, a shielding wall having a surface as a reflective surface is provided on the mounting base portion, and the shielding wall is provided. One end of the is closed by a transparent cover, and a space partitioned by the outer wall and the shielding wall is provided.</p><p> Further, in the invention described in claim 5 of the present invention, in any one of claims 1 to 4, the first photosensor located on the mounting base portion is provided with a pedestal. The first photosensor is characterized in that the heights of the emission end faces of the light emitted from the white LED light source are equal to each other.</p><p> The invention described in claim 6 of the present invention is a white LED light source module including a white LED light source and a transparent thin film solar cell, which is arranged on a mounting base portion and the mounting base portion. The LED element is a sealing resin in which a phosphor is mixed with a translucent resin in a space partitioned by an outer wall having an opening above the outer wall and a transparent cover provided so as to close the opening of the outer wall. A white LED light source module in which a sealed white LED light source is mounted and a transparent thin-film solar cell is arranged in the vicinity of the transparent cover. The LED light source module receives external light during standby when it is not used as a light source. By driving the LED element with the electromotive force of the transparent thin-film solar cell, the brightness of the white LED light source becomes the brightness corresponding to the brightness of the outside light.</p><p> Further, in the invention described in claim 7 of the present invention, in any one of claims 1 to 6, the LED element is a blue LED element that emits blue light, and the phosphor is excited by blue light. A blue phosphor that emits yellow light, or a mixed fluorescence of a green phosphor that is excited by blue light and emits green light and a red phosphor that is excited by blue light and emits red light. It is characterized by being a body.</p>

<p> The white LED light source module of the present invention includes a white LED light source in which an LED element is resin-sealed with a sealing resin in which a phosphor is mixed with a translucent resin, and a photosensor for detecting external light. In the standby mode of, a minute drive current corresponding to the brightness of the external light received by the photo sensor is supplied to the LED element so that the white LED light source is always lit with the same brightness as the external light.</p><p> As a result, it is possible to hide the phosphor color of the sealing resin without making the lighting of the white LED light source conspicuous, and to improve the appearance of the equipment and devices incorporating the white LED light source module, and to improve the degree of perfection and commercial value. Was able to be enhanced.</p>

<figref num="1">It is explanatory drawing which concerns on Example 1 of this invention.</figref><figref num="2">It is explanatory drawing of the LED light source.</figref><figref num="3">It is a figure which shows the light distribution characteristic of an LED light source.</figref><figref num="4">It is a circuit block diagram of the LED light source module.</figref><figref num="5">It is explanatory drawing which concerns on Example 2 of this invention.</figref><figref num="6">It is explanatory drawing which concerns on Example 3 of this invention.</figref><figref num="7">It is a circuit block diagram of the LED light source module.</figref><figref num="8">It is explanatory drawing which concerns on Example 4 of this invention.</figref><figref num="9">It is explanatory drawing which concerns on Example 5 of this invention.</figref><figref num="10">It is explanatory drawing which concerns on Example 5 of this invention.</figref><figref num="11">It is explanatory drawing which concerns on Example 5 of this invention.</figref><figref num="12">It is explanatory drawing which concerns on Example 5 of this invention.</figref>

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12 (the same parts are designated by the same reference numerals). Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are added, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

The present invention forms a white LED light source module including a white LED light source in which a blue LED element is resin-sealed with a sealing resin in which a phosphor is mixed with a translucent resin, and a photosensor that detects external light. In the standby mode of the white LED light source module, a minute drive current corresponding to the brightness of the external light received by the photo sensor is supplied to the blue LED element to constantly light the white LED light source with the same brightness as the external light. Is. As a result, the phosphor color of the sealing resin can be hidden without making the lighting of the white LED light source conspicuous, and the appearance of the equipment, the device, etc. incorporating the white LED light source module is improved, and the degree of perfection and commercial value are improved. Is to enhance.

<p> The first embodiment is a white LED light source module composed of one white LED light source and one photosensor. FIG. 1 ((a) and (b) are cross-sectional views, (c) is a top view of (a) and (b)) shows a configuration in which a shielding wall 4 is provided between the white LED light source 10 and the photosensor 7. It is explanatory drawing of the white LED light source module 1.</p><p> First, the white LED light source 10 used in the white LED light source module 1 of all the examples will be described with reference to FIG.</p><p> The white LED light source 10 shown in FIG. 2 is a so-called surface mount type, in which a reflection frame 13 having a bowl-shaped recess 12 having an opening at the top is provided on a substrate 11 having a circuit pattern, and the recess is provided. An InGaN-based blue LED element 15 that emits blue light is mounted on the first circuit pattern 14 on the bottom surface of the 12 via an adhesive member (not shown). Then, one of the two electrodes (not shown) provided on the upper part of the blue LED element 15 is connected to the first circuit pattern 14 via the bonding wire 16 to achieve electrical conduction, and the other electrode is It is connected to a second circuit pattern 17 separated from the first circuit pattern 14 via a bonding wire 16 to achieve electrical conduction. Further, the recess 12 provided in the reflection frame 13 is filled with a sealing resin 20 in which a phosphor 19 is mixed with a translucent resin 18, and the blue LED element 15 and the bonding wire 16 are resin-sealed. The reflective frame 13 is made of a highly reflective member having a high light-shielding property, and the inner surface 21 of the recess 12 forms a reflective surface without any special reflection treatment, but is reflected by the inner surface 21 of the recess 12. It is also possible to form a reflective surface by applying a high rate of aluminum, silver, etc. by a method such as vapor deposition or painting.</p><p> The phosphor 19 is excited by a yellow phosphor that is excited by the blue light emitted from the blue LED element 15 and converts the wavelength into yellow light that is a complementary color of the blue light, or is excited by the blue light emitted from the blue LED element 15. One of a mixed phosphor of a green phosphor that converts the wavelength to green light and a red phosphor that converts the wavelength to red light is used.</p><p> When the phosphor 19 is a yellow phosphor, a part of the blue light emitted from the blue LED element 15 and a part of the blue light emitted from the blue LED element 15 are wavelength-converted by exciting the yellow phosphor. Light with a color tone close to white light can be obtained by additive color mixing with yellow light.</p><p> On the other hand, when the phosphor 19 is a mixed phosphor of a green phosphor and a red phosphor, a part of the blue light emitted from the blue LED element 15 and a part of the blue light emitted from the blue LED element 15 are part of the blue light. White light by additive color mixing of green light whose wavelength is converted by exciting a green phosphor and red light whose wavelength is converted by a part of blue light emitted from the blue LED element 15 by exciting a red phosphor. Can be obtained.</p><p> In any of the above cases, the phosphor 19 when the blue LED element 15 is not lit is light in the ultraviolet to blue wavelength region contained in external light consisting of natural light such as sunlight or artificial light such as a light bulb or a fluorescent lamp. It is excited by and emits weak fluorescence. Therefore, when the sealing resin 20 in which the blue LED element 15 is sealed is observed when the blue LED element 15 is not lit, the sealing resin 20 in which the yellow phosphor is dispersed looks yellowish and becomes a green phosphor. The sealing resin 20 in which the mixed fluorescent substance of the red fluorescent substance is dispersed looks orangeish.</p><p> The white LED light source has the light distribution characteristics of the Lambersian distribution as shown in FIG. 3, and the amount of light emitted from the blue LED element 15 toward the side of the white LED light source 10 is small.</p><p> Returning to FIG. 1, in the configuration of the white LED light source module 1 of FIG. 1, an outer wall 3 made of a highly reflective member having a high light-shielding property is provided on the mounting substrate 2, and the space surrounded by the outer wall 3 is light-shielded. A shielding wall 4 made of a highly reflective member is provided to partition two spaces, a first space 5 and a second space 6. In this case, the outer wall 3 and the shielding wall 4 may be integrally formed, or individually manufactured ones may be integrated.</p><p> Then, the white LED light source 10 is mounted on the mounting board 2 in the first space 5, and the photosensor 7 mounted on the mounting board 2 in the second space 6 (see FIG. 1 (a)). Alternatively, it is provided with a photosensor 7 (see FIG. 1 (b)) mounted on a pedestal 8 having a height similar to the height of the white LED light source 10 arranged on the mounting board 2. In all the embodiments, the photosensor 7 is composed of a photoelectric conversion element such as a photodiode or a phototransistor.</p><p> A transparent cover 9 is arranged above the white LED light source 10 and the photo sensor 7 so as to cover the white LED light source 10 and the photo sensor 7.</p><p> In both the white LED light source module having the configuration shown in FIG. 1 (a) and the white LED light source module having the configuration shown in FIG. 1 (b), the white LED light source 10 and the photosensor 7 are separated by a shielding wall 4. It is housed in one space 5 and in the second space 6, and has a structure that prevents light noise so that the light emitted from the white LED light source 10 is shielded by the shielding wall 4 and is not directly received by the photosensor 7. It has become.</p><p> On the other hand, in the white LED light source module of FIG. 1A, the photosensor 7 is at the bottom in the second space 6 surrounded by a shielding wall 4 made of a highly reflective member as well as an outer wall 3 made of a highly reflective member. It is mounted on the mounting board 2 located at, and despite the fact that the photosensor 7 is located below the transparent cover 9, the outside light is reflected by the outer wall 3 and the shielding wall 4 for efficiency. The structure is such that it often reaches the light receiving surface of the photosensor 7.</p><p> On the other hand, in the white LED light source module of FIG. 1 (b), the photosensor 7 is white in the second space 6 surrounded by the outer wall 3 made of a highly reflective member and the shielding wall 4 also made of a highly reflective member. It is mounted on a pedestal 8 that has the same height as the LED light source 10, and since the photo sensor 7 is located near the transparent cover 9, external light is directly and efficiently received by the photo sensor 7. It has a structure that reaches the surface.</p><p> Therefore, when comparing the white LED light source module of FIG. 1 (a) and FIG. 1 (b), the white LED light source module of FIG. 1 (a) has a pedestal 8 with respect to the white LED light source module of FIG. 1 (b). The material cost and the assembly manpower can be reduced by the amount that is unnecessary, and the manufacturing cost can be suppressed.</p><p> Further, since the white LED light source module of FIG. 1 (b) receives the external light directly on the light receiving surface of the photo sensor 7, the reflected light of the external light is received by the light receiving surface of the photo sensor 7 in the white color of FIG. 1 (a). The brightness of the external light can be detected more accurately with respect to the LED light source module, and the brightness of the white LED light source can be made closer to the brightness of the external light.</p><p> FIG. 4 is a block diagram showing an example of a circuit incorporated in the white LED light source module 1 of the first embodiment and the second embodiment described later. The signal processing circuit 30 includes a mode switching unit 31 for switching between the light source mode and the standby mode of the white LED light source module 1, and a blue color such that the white LED light source 10 has a predetermined brightness when the white LED light source module 1 is in the light source mode. Drive current of LED element 15 I_LOutput signal S based on_LIs the output signal S from the light source mode signal generator 32 set in advance and the detection circuit unit 38 that takes in the external light detection signal from the photo sensor 7 and performs signal processing when the white LED light source module 1 is in the standby mode._XOn the other hand, the drive current I of the blue LED element 15 such that the surface brightness of the light receiving surface of the photo sensor 7 and the surface brightness of the light emitting surface of the sealing resin 20 of the white LED light source 10 at that time are substantially the same._WOutput signal S based on_WReceives the output signal from the preset standby mode signal generation unit 33 and the light source mode signal generation unit 32 or the standby mode signal generation unit 33, and the corresponding current I_LOr I_WIt has an LED drive circuit unit 34 that drives (lights up) the blue LED element 15.</p><p> Therefore, when the white LED light source module 1 is in the light source mode, the light source mode signal S is transmitted to the mode switching unit 31 from the outside._MIs transmitted, the light source mode signal generation unit 32 is selected by the mode switching unit 31, and the output signal S from the light source mode signal generation unit 32 is selected._LIs transmitted to the LED drive circuit unit 34, and the drive current I is sent to the blue LED element 15._LIs supplied and emits light.</p><p> On the other hand, when the white LED light source module 1 is in the standby mode, no signal is transmitted from the outside to the mode switching unit 31, and the mode switching unit 31 selects the standby mode signal generating unit 33 from the standby mode signal generating unit 33. Output signal S_WIs transmitted to the LED drive circuit unit 34, and the drive current I is sent to the blue LED element 15._WIs supplied and emits light.</p><p> In the standby mode of the white LED light source module 1, a minute drive current I corresponding to the brightness of the external light received by the photo sensor 7_WIs supplied to the blue LED element 15, and the white LED light source 10 lights up with the same brightness as the outside light. Therefore, the brightness of the white LED light source 10 changes in response to the change in the brightness of the outside light, and is always lit with the same brightness as the brightness of the outside light.</p><p> Therefore, in the standby mode of the white LED light source module 1, the lighting of the white LED light source is not conspicuous and the phosphor color of the sealing resin is not shown. It is possible to improve the degree of perfection and commerciality without spoiling the appearance.</p><p> The circuit incorporated in the white LED light source module 1 is a minute drive current I corresponding to the brightness of the external light received by the photo sensor 7 in the standby mode of the white LED light source module 1._WIs not limited to the circuit shown in the block diagram above, as long as the white LED light source 10 can be lit with the same brightness as the outside light by supplying the blue LED element 15.</p><p> Also, the drive current I of the blue LED element 15 in the standby mode._WCan be either direct current or pulsed current. However, in the case of pulse current, the power supply load can be reduced, which is advantageous when the device or device incorporating the white LED light source module is battery-powered.</p>

<p> The second embodiment is a white LED light source module composed of one white LED light source and one photosensor as in the first embodiment, and the light distribution characteristics of the white LED light source are Lambersian distribution (Fig.). 3), and considering that the amount of light emitted from the blue LED element toward the side of the white LED light source is small, the only difference from Example 1 is that the structure has no shielding wall.</p><p> 5 ((a) and (b) are cross-sectional views, (c) is a top view of (a) and (b)) is an explanatory view showing Example 2.</p><p> In the configuration of the white LED light source module 1 of FIG. 5, an outer wall 3 made of a highly reflective member having a high light-shielding property is provided on the mounting board 2, and the mounting board is contained in the third space 40 surrounded by the outer wall 3. 2 White LED light source 10 and tophoto sensor 7 mounted side by side (see Fig. 5 (a)), or white LED light source 10 mounted on the mounting board 2, and white LED light source 10 mounted on the mounting board 2. It is equipped with a photo sensor 7 (see FIG. 5 (b)) mounted on a pedestal 8 having a height similar to the height of the white LED light sources 10 arranged side by side.</p><p> A transparent cover 9 is arranged above the white LED light source 10 and the photo sensor 7 so as to cover the white LED light source 10 and the photo sensor 7.</p><p> In the white LED light source module of FIG. 5 (a), the photosensor 7 is surrounded by the outer wall surface 3 made of a highly reflective member and the outer wall surface 13a of the reflection frame 13 made of a highly reflective member of the white LED light source 10. It is mounted on the mounting board 2 located at the bottom of the light source, and although the photosensor 7 is located below the transparent cover 9 at a distance from the transparent cover 9, the outside light is emitted from the outer wall surface 3 and the outer wall surface of the reflection frame 13. The structure is such that it efficiently reaches the light receiving surface of the photo sensor 7 while being reflected by 13a.</p><p> On the other hand, in the white LED light source module of FIG. 5 (b), the photosensor 7 is surrounded by an outer wall surface 3 made of a highly reflective member and an outer wall surface 13a of a reflective frame 13 made of a highly light-shielding highly reflective member of the white LED light source 10. It is mounted on a pedestal 8 that has a height similar to the height of the white LED light source 10 in this area, and since the photosensor 7 is located close to the transparent cover 9, external light is directly and efficiently. The structure is such that it reaches the light receiving surface of the photo sensor 7.</p><p> Therefore, when comparing the white LED light source module of FIG. 5 (a) and FIG. 5 (b), the white LED light source module of FIG. 5 (a) has a pedestal 8 with respect to the white LED light source module of FIG. 5 (b). The material cost and the assembly manpower can be reduced by the amount that is unnecessary, and the manufacturing cost can be suppressed.</p><p> Further, since the white LED light source module of FIG. 5 (b) receives the external light directly on the light receiving surface of the photo sensor 7, the reflected light of the external light is received by the light receiving surface of the photo sensor 7 in the white color of FIG. 5 (a). The brightness of the external light can be detected more accurately with respect to the LED light source module, and the brightness of the white LED light source can be made closer to the brightness of the external light.</p><p> When Example 1 and Example 2 are compared, in Example 2, the material cost and the assembly man-hours can be reduced by the amount that the shielding wall 4 is unnecessary, and the manufacturing cost can be suppressed. be able to. At the same time, the size of the white LED light source module can be reduced by the amount that the shielding wall 4 is unnecessary.</p><p> Further, since the first embodiment has the shielding wall 4, the effect of preventing the light noise by the white LED light source 10 is larger than that of the second embodiment having no shielding wall, and the brightness of the outside light can be detected more accurately. Therefore, the brightness of the white LED light source can be made closer to the brightness of the outside light.</p>

<p> The third embodiment has a configuration in which one photosensor is added to the first embodiment, and is a white LED light source module composed of one white LED light source and two photosensors.</p><p> 6 ((a) and (b) are cross-sectional views, (c) is a top view of (a) and (b)) is an explanatory view showing Example 3.</p><p> In the configuration of the white LED light source module 1 of FIG. 6 (a), the light receiving surface is a white LED light source inside the transparent cover 9 above the white LED light source 10 with respect to the configuration of FIG. 1 (a) of the first embodiment. The structure is such that the photosensor 45 is attached toward the side, and the configuration of the white LED light source module 1 in FIG. 6 (b) is different from the configuration in FIG. 1 (b) in the first embodiment. The structure is such that the photosensor 45 is attached to the inside of the transparent cover 9 above the above, with the light receiving surface facing the white LED light source side.</p><p> In this embodiment, in the standby mode of the white LED light source module 1, the photo sensor 7 detects the brightness of the outside light and the photo sensor 45 detects the brightness of the white LED light source, and the amount of light received by the photo sensor 45 is photo. The drive current of the blue LED element is controlled so as to be equal to the amount of light received by the sensor 7, so that the brightness of the white LED light source and the brightness of the outside light are always the same.</p><p> FIG. 7 is a block diagram showing an example of a circuit incorporated in the white LED light source module 1 of the third embodiment and the fourth embodiment described later.</p><p> In the block diagram of FIG. 7, a feedback circuit unit 37 is provided instead of the standby mode signal generation unit 33 with respect to the block diagram of FIG. 4 incorporated in the first and second embodiments.</p><p> Specifically, the output signal S from the detection circuit unit 38 that takes in the external light detection signal from the photo sensor 7 and performs signal processing._XAnd the output signal S from the detection circuit unit 39 that takes in the irradiation light detection signal of the white LED light source 10 from the photo sensor 45 and performs signal processing._BThe output signal S of the comparison result of the signal comparison unit 35 and the signal comparison unit 35_CReceived LED drive current I_WOperation amount signal S to control_VIt has an operation unit 36 that outputs.</p><p> Therefore, when the white LED light source module 1 is in the light source mode, the light source mode signal S is transmitted to the mode switching unit 31 from the outside._MIs transmitted, the light source mode signal generation unit 32 is selected by the mode switching unit 31, and the output signal S from the light source mode signal generation unit 32 is selected._LIs transmitted to the LED drive circuit unit 34, and the drive current I is sent to the blue LED element 15._LIs supplied and emits light.</p><p> On the other hand, when the white LED light source module 1 is in the standby mode, no signal is transmitted from the outside to the mode switching unit 31, and the mode switching unit 31 selects the feedback circuit unit 37. Output signal S from the detection circuit unit 38 that captures the external light detection signal from the photo sensor 7 and performs signal processing._XAnd S from the detection circuit unit 39 that takes in the irradiation light detection signal of the white LED light source 10 from the photo sensor 45 and performs signal processing._BIs sent to the signal comparison unit 35, and the output signal S of the comparison result of the signal comparison unit 35_CIs the LED drive current I_WIs transmitted to the operation unit 36 that controls the operation unit 36, and the operation amount signal S from the operation unit 36_VIs transmitted to the LED drive circuit unit 34, and the drive current I is sent to the blue LED element 15._WIs supplied and emits light.</p><p> In the standby mode of the white LED light source module 1, the difference in brightness is eliminated by comparing the brightness of the external light received by the photo sensor 7 with the brightness of the irradiation light of the white LED light source received by the photo sensor 45. Such a minute drive current I_WCan be supplied to the blue LED element 15 to light the white LED light source 10 with the same brightness as the outside light. Therefore, the brightness of the white LED light source 10 changes in response to the change in the brightness of the external light, and the white LED light source 10 can be lit at the same brightness as the external light at all times.</p><p> Therefore, when comparing the white LED light source module of FIG. 6 (a) and FIG. 6 (b), the white LED light source module of FIG. 6 (a) has a pedestal 8 with respect to the white LED light source module of FIG. 6 (b). The material cost and the assembly manpower can be reduced by the amount that is unnecessary, and the manufacturing cost can be suppressed.</p><p> Further, since the white LED light source module of FIG. 6 (b) receives the external light directly on the light receiving surface of the photo sensor 7, the reflected light of the external light is received by the light receiving surface of the photo sensor 7 in the white color of FIG. 6 (a). The brightness of the external light can be detected more accurately with respect to the LED light source module, and the brightness of the white LED light source can be made closer to the brightness of the external light.</p>

<p> The fourth embodiment is a white LED light source module composed of one white LED light source and two photosensors, as in the third embodiment, and the light distribution characteristics of the white LED light source are Lambersian distribution (Fig.). 3), and considering that the amount of light emitted from the blue LED element toward the side of the white LED light source is small, the only difference from Example 3 is that the structure has no shielding wall.</p><p> 8 ((a) and (b) are cross-sectional views, (c) is a top view of (a) and (b)) is an explanatory view showing Example 4.</p><p> In the configuration of the white LED light source module 1 of FIG. 8, an outer wall 3 made of a highly reflective member having a high light-shielding property is provided on the mounting board 2, and the mounting board is contained in the third space 40 surrounded by the outer wall 3. 2 White LED light source 10 and photosensor 7 mounted side by side (see Fig. 8 (a)), or white LED light source 10 mounted on the mounting board 2 and white LED light source 10 mounted on the mounting board 2. It is equipped with a photosensor 7 (see FIG. 8 (b)) mounted on a pedestal 8 having a height similar to the height of the installed white LED light source 10, and further, in any of the white LED light source modules 1. Also, the photosensor 45 is attached to the inside of the transparent cover 9 above the white LED light source 10 with the light receiving surface facing the white LED light source side.</p><p> In this embodiment, in the standby mode of the white LED light source module 1, the photo sensor 7 detects the brightness of the outside light and the photo sensor 45 detects the brightness of the white LED light source, and the amount of light received by the photo sensor 45 is photo. The drive current of the blue LED element is controlled so as to be equal to the amount of light received by the sensor 7, so that the brightness of the white LED light source and the brightness of the outside light are always the same.</p><p> Therefore, when comparing the white LED light source module of FIG. 8 (a) and FIG. 8 (b), the white LED light source module of FIG. 8 (a) has a pedestal 8 with respect to the white LED light source module of FIG. 8 (b). The material cost and the assembly manpower can be reduced by the amount that is unnecessary, and the manufacturing cost can be suppressed.</p><p> Further, since the white LED light source module of FIG. 8 (b) receives the external light directly on the light receiving surface of the photo sensor 7, the reflected light of the external light is received by the light receiving surface of the photo sensor 7 in the white color of FIG. 8 (a). The brightness of the external light can be detected more accurately with respect to the LED light source module, and the brightness of the white LED light source can be made closer to the brightness of the external light.</p><p> When Example 3 and Example 4 are compared, in Example 4, the material cost and the assembly man-hours can be reduced by the amount that the shielding wall 4 is unnecessary, and the manufacturing cost can be suppressed. be able to. At the same time, the size of the white LED light source module can be reduced by the amount that the shielding wall 4 is unnecessary.</p><p> Further, since the third embodiment has the shielding wall 4, the effect of preventing light noise is larger than that of the fourth embodiment having no shielding wall, and the brightness of the outside light can be detected more accurately. Therefore, the white LED light source. The brightness of the LED can be made closer to the brightness of the outside light.</p>

<p> 9 ((a) is a sectional view, (b) is a top view of (a)), FIG. 10 ((a) is a sectional view, (b) is a top view of (a)), FIG. 11 ((a)) Is a cross-sectional view, (b) is a top view of (a)), FIG. 12 ((a) is a cross-sectional view, (b) is a top view of (a)) is an explanatory view showing Example 5.</p><p> In this embodiment, instead of the photosensors 7 used in Examples 1 to 4, a transparent thin-film solar cell TFSC (hereinafter abbreviated as a solar cell) is used in the standby mode of the white LED light source module. The blue LED element is directly driven (lighted) by the electromotive force of the solar cell that receives external light. As a result, since the blue LED element is driven by the electromotive force of the solar cell according to the brightness of the outside light, the brightness of the white LED light source can always be maintained at the brightness corresponding to the brightness of the outside light.</p><p> In this embodiment, since the light receiving area is larger than in other embodiments provided with PD, the detection sensitivity of external light is increased, the difference in brightness from external light is eliminated, and the current that can be passed through the white LED light source. The value will increase, and the white LED light source module will be compatible with a wide range of external light brightness, and the accuracy of equalizing the brightness with external light will be further improved.</p><p> Further, in this embodiment, since the light receiving area is larger than that in Examples 1 and 2, the photocurrent value due to the incident of external light is high due to the use of TFSC. Therefore, it is possible to directly drive an electric device, unlike a light receiving element that can flow only a weak photocurrent as a signal input source for pseudo-lighting due to external light incident.</p><p> Further, when the outside light is bright in this embodiment, the current value used for the pseudo lighting is reduced, and the remaining current is used for other electric devices such as battery auxiliary charging, pulse drive circuit, and the signal of FIG. It can be used for the operating power of various devices in the processing circuit 30.</p><p> The specific configuration of the white LED light source module 1 is that the outer wall 3 is provided on the mounting board 2, and the white LED light source 10 is mounted on the mounting board 2 in the fourth space 41 surrounded by the outer wall 3. A transparent cover 9 is arranged above the white LED light source 10 so as to cover the white LED light source 10.</p><p> Further, the solar cell 50 is attached, and the position shown in FIG. 9 is the central portion on the outer surface of the transparent cover 9, the one shown in FIG. 10 is the peripheral portion on the outer surface of the transparent cover 9, and the position is shown in FIG. What is shown is the central part on the inner surface of the transparent cover 9, and what is shown in FIG. 12 is the peripheral part on the inner surface of the transparent cover 9.</p><p> Comparing the white LED light source modules of FIGS. 9 and 10 with the white LED light source modules of FIGS. 11 and 12, the white LED light source modules of FIGS. 11 and 12 have the solar cell transparent to the mounting substrate 2 and the outer wall 3. The figure which is located inside the fourth space 41 which is a closed space surrounded by the cover 9 and is protected from the external environment, and the solar cell 50 is located outside the fourth space 41 and is exposed to the external environment. It is highly reliable for the white LED light source modules 9 and 10.</p><p> Further, in the white LED light source modules of FIGS. 10 and 12, the solar cell 50 is located at a position (peripheral part) deviated from directly above the white LED light source 10, and the solar cell 50 is directly above the white LED light source 10 (center). Compared to the white LED light source modules of FIGS. 9 and 11 located in the section), the amount of dimming is small because the ratio of the irradiation light from the white LED light source 10 that passes through the solar cell 50 is small, and the bright white LED light source module. Can be realized.</p><p> The size (light receiving area) of the solar cell 50 is set based on the current value required to drive the blue LED element 15. Therefore, if the solar cell 50 attached to the white LED light source module 1 cannot cover the power required to drive the blue LED element 15, a device or device incorporating the white LED light source module 1 together with the LED white LED light source module 1. It is also conceivable to install a separate solar cell 50 to increase the power consumption.</p>

1 ... White LED light source module 2 ... Mounting board 3 ... outer wall 4 ... Shielding wall 5 ... First space 6 ... Second space 7 ... Photo sensor 8 ... pedestal 9 ... transparent cover 10 ... White LED light source 11 ... board 12 ... recess 13 ... Reflective frame 13a ... outer wall 14 ... First circuit pattern 15 ... Blue LED element 16 ... Bonding wire 17 ... Second circuit pattern 18 ... Translucent resin 19 ... Fluorescent 20 ... Encapsulating resin 21 ... Inside 30 ... Signal processing circuit 31 ... Mode switching unit 32 ... Light source mode signal generator 33 ... Standby mode signal generator 34 ... LED drive circuit 35 ... Signal comparison section 36 ... Operation unit 37 ... Feedback circuit section 38 ... Detection circuit part 39 ... Detection circuit 40 ... Third space 41 ... Fourth space 45 ... Photo sensor 50 ... Transparent thin-film solar cells