Led module

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to lighting fixtures such as foot lights, indicator lights, spot lights, wall washers, architectural lights, stands, and interior lights, and LED modules used for signal lights, line-of-sight guide lights, and the like.

【0002】

[Conventional technology]

Conventionally, there are LED modules of this type shown in Jitsukaihei 4-92660 (conventional example 1) and JP-A-61-188803 (conventional example 2). FIG. 18 is a cross-sectional view of the LED module of the conventional example 1, and FIG. 19 is a cross-sectional view of the LED light source of the conventional example 2. In FIG. 18, the LED chip 50 is surrounded by a reflective frame 51 and sealed with a lens 52 made of transparent resin. Further, in FIG. 19, the lens 54 is attached to the discrete LED 53.

【0003】

[Problems to be Solved by the Invention]

However, in the conventional example 1, since the light controlled by the reflection frame 51 is refracted by the front lens 52 and emitted, most of the light rays emitted by the light source (LED chip) 50 are diffused in directions other than the front. There was a problem that it would end up.

【0004】

In Conventional Example 2, the light emitted by the light source can be efficiently controlled to parallel light, but the lens shape is complicated and it is difficult to manufacture. Further, there is a problem that the length of the lens 54 becomes large and the size of the LED light source becomes large.

【0005】

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide an LED module having a narrow angle light distribution that efficiently reflects light at a minimum necessary solid angle.

【0006】

[Means for solving problems]

In order to solve the above problems, the LED module according to claim 1 of the present invention includes a light distribution unit in which an LED light source arranged on the axis c of the optical system is surrounded by a reflecting surface and sealed with a sealing material. In the LED module, the lens surface Lp of the encapsulant is formed of a plane centered on the axis c of the optical system, and the reflecting surface is an inner reflecting surface composed of concave curved surfaces arranged symmetrically with respect to the axis c of the optical system. It has Rl and an outer reflecting surface Ru, and the radial line lp along the lens surface Lp is a linear line perpendicular to the axis c of the optical system, and is radially along the inner reflecting surface Rl. The focus of the parabola rl is located at point p0 on the light source, the distance of one end point p1 of the parabola rl from the axis c of the optical system is greater than or equal to the radius required for the installation of the light source, and the other end point p2 of the parabola rl is. , A straight line and a line extending at an angle of a critical angle θ with respect to the axis c of the optical system starting from a point p0 on the light source and a point p0 axisymmetric with the point p0 on the light source with the line segment lp as the axis of symmetry. The point on the straight line extending from the point p0'and the point p5, where the intersection with the minute lp is p5, is on the light source side of the line lp, and the radial parabola ru along the outer reflecting surface Ru is its focal point. Is located at the point p0', and one end point p3 of the parabola ru is located on the light source side of the straight line extending by connecting the point p0'and the point p5 and outside the parabola rl, and the other end point p4 of the parabola ru. Is the intersection of the line lp and the parabola ru.

【0007】

With the above configuration, the light emitted from the light source is controlled to the light parallel to the axis c of the optical system through two paths. First, the light traveling from the light source in the direction of the reflection surface Rl is controlled to parallel light by reflection because the reflection surface Rl is a curved surface having a focal point on the light source. The light reflected by the reflecting surface Rl is incident on the lens surface Lp almost perpendicularly and is emitted as parallel light. Further, the light traveling from the light source between the reflection surface Rl and the point p5 is first totally reflected by the lens surface Lp. Since the reflection surface Ru is configured so that its focus is located on the virtual image of the light source due to the reflection on the lens surface Lp, the light totally reflected by the lens surface Lp is controlled to parallel light by the reflection surface Ru. .. Since the light reflected by the reflecting surface Ru is incident on the lens surface Lp almost perpendicularly, it is emitted as parallel light with almost no deflection due to refraction. As a result, most of the light in the range from the direction of the point p5 to the end point p1 direction of the reflecting surface Rl can be controlled to be parallel light and emitted without a lens.

【0008】

The LED module according to claim 2 is located at the intersection of a straight line extending by connecting points p0'and p5 with one end point p3 of the parabola ru and the parabola rl in claim 1. This makes the diameter of the optical system the smallest.

【0009】

In the LED module according to claim 3, in claim 1, the distance from the axis c of the optical system of the end point p1 of the parabola rl is equal to the radius required for installing the LED light source, and the optics of one end point p4 of the parabola ru. The distance from the axis c of the system is greater than or equal to the distance from the axis c of the optical system at the point p4', where p4'is the intersection of the straight line extending by connecting the point p0 on the light source and the end point p2 of the parabola rl and the line segment lp. And said.

【0010】

As a result, the reflecting surface Ru is hidden behind the reflecting surface Rl when viewed from the light source, and there is no component directly incident on the reflecting surface Ru from the light source. Therefore, when there is light that reaches the reflection surface Ru directly from the light source, the reflection surface Ru has a function of controlling only the incident light from the p0'direction to parallel light, so that the light incident from the direct light source direction is parallel light. It will not be converted to.

【0011】

The LED module according to claim 4 is an LED module having a light distribution portion in which an LED light source arranged on the axis c of the optical system is surrounded by a reflecting surface and sealed with a sealing material, and the lens surface of the sealing material is provided. Has an inner lens surface LE consisting of a convex curved surface centered on the axis c of the optical system and an outer lens surface Lp consisting of a flat surface, and the reflecting surfaces are concave curved surfaces arranged symmetrically with respect to the axis c of the optical system. It has an inner reflecting surface Rl and an outer reflecting surface Ru, and the radial curve lE along the inner lens surface LE has its end point p5'starting from the point p0 on the light source and with respect to the axis c of the optical system. The radial line lp along the outer lens surface Lp, which is outside the straight line extending at the critical angle θ', is a line on the straight line passing through the point p5'and orthogonal to the axis c of the optical system. The radial parabolic rl along the inner reflective surface Rl has its focal point at point p0 on the light source, and the distance of one end point p1 of the parabola rl from the axis c of the optical system is the end point p5'of the curve lE. Above the distance from the axis c of the optical system, the other end point p2 of the parabola rl is a point p0'and a point p0', where the point at a position symmetrical with the point p0 on the light source with the line segment lp as the axis of symmetry is p0'. It is located at the intersection of the straight line extending p5'and the parabola rl, the focal point of the radial parabola ru along the outer reflective surface Ru is at the point p0', and one end point p3 of the parabola ru is. It is located on the light source side of the straight line connecting the points p0'and the point p5'and outside the parabola rl, and the other end point p4 of the parabola ru is the intersection of the line segment lp and the parabola ru.

【0012】

Since the lens surface LE covering the range from the light source to the point p5 is added in this way, in this optical system, the light emitted from the light source between the end point p1 and the point p5'of the reflection surface Rl is claimed in claim 1. It is controlled by parallel light by the same mechanism as. In addition, the light emitted in the direction of the lens surface LE is refracted in the direction of being focused on the axis c of the optical system because the lens surface LE forms a convex lens. Therefore, when the element that controls the light radiated from the light source to the point p5 and the axis of the optical system to be parallel light is not given, the light radiated in this range does not become parallel light and the lens surface Lp It will not be refracted in the direction of diffusion.

【0013】

In the LED module according to claim 5, in claim 4, the curve lE is a part of an ellipse and the ratio of the major axis aE to the minor axis bE is such that n'is the refractive index of the medium of the lens and n is the refractive index of air. bE / aE = (n ²-n²)^1/2Satisfying / n , one focal point of the ellipse is located at the point p0 on the LED light source, the center of the ellipse is on the axis c of the optical system on the irradiation direction side from the point p0, and the end point p5 of the curve lE is the ellipse. And its minor axis intersection.

【0014】

It is known that an elliptical lens having such a lens surface LE has a property of controlling light emitted from the focal point into parallel light. In this optical system, the light emitted from the light source between the end points p1 and the point p5'of the reflecting surface Rl is controlled to parallel light by the same mechanism as in claim 1. In addition, the light emitted in the direction of the lens surface LE is controlled to parallel light because the lens surface LE is an elliptical lens having the above-mentioned properties. Therefore, it is possible to control the light in the range from the axis c of the optical system to the end point p1 direction of the reflecting surface Rl to be almost parallel light and emit it.

【0015】

In the LED module according to claim 6, in claim 5, the distance from the axis c of the optical system at one end point p1 of the parabola rl is equal to the distance from the axis c of the optical system at the end point p5'of the curve lE. One end point p3 of the parabola ru is located at the intersection of the straight line extending by connecting the points p0'and the point p5'and the parabola rl. This makes the diameter of the optical system the smallest.

【0016】

In the LED module according to claim 7, in claim 5, the distance from the axis c of the optical system at one end point p1 of the parabola rl is equal to the distance from the axis c of the optical system at the end point p5'of the curve lE. The distance of one end point p4 of the parabola ru from the axis c of the optical system is p4', where p4'is the intersection of the straight line extending by connecting the point p0 on the LED light source and the end point p2 of the parabola rl and the line segment lp. It is greater than or equal to the distance from the axis c of the optical system.

【0017】

As a result, the reflecting surface Ru is hidden behind the reflecting surface Rl when viewed from the light source, and there is no component directly incident on the reflecting surface Ru from the light source. Therefore, when there is light that reaches the reflection surface Ru directly from the light source, the reflection surface Ru has a function of controlling only the incident light from the p0'direction to parallel light, so that the light incident from the direct light source direction is parallel light. It will not be converted to.

【0018】

BEST MODE FOR CARRYING OUT THE INVENTION

The LED module according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view showing the geometrical configuration of the LED module according to the first embodiment of the present invention, and FIG. 2 (a) is an overall view of a signal lamp using the LED module according to the first embodiment of the present invention. , (B) is an enlarged view of the lamp portion, (c) is a cross-sectional view of AA'of (b), and FIG. 3 is an operation explanatory view of the first embodiment of the present invention.

【0019】

As shown in FIG. 2A, in this embodiment, the lamp unit 1 of the signal lamp is composed of an LED module. The LED module includes a large number of light distribution units 2 as shown in FIG. 2 (b), and one of the configurations is shown in FIG. 2 (c). In FIG. 2 (c), 3 is a printed circuit board, 4 is an LED chip, 5 is a resin reflective frame, 6 is an aluminum-deposited surface, and 7 is an epoxy resin. The LED chip 4 is used as an LED light source, is surrounded by a reflective surface formed of an aluminum-deposited surface 6 or the like, and is sealed with a sealing substance such as an epoxy resin 7.

【0020】

As shown in FIG. 1, the light distribution section 2 of the LED module has a plane in which the lens surface Lp of the encapsulant is centered on the axis c of the optical system, and the reflecting surface is symmetrical with respect to the axis c of the optical system. It has an inner reflective surface Rl and an outer reflective surface Ru, each of which is composed of concave curved surfaces. In this case, the sealing substance has a lens surface Lp obtained by rotating a line segment lp that satisfies all of the following conditions around the axis c of the optical system. Here, the axis c of the optical system is a straight line that passes through the light source and extends in the irradiation direction of the optical system.

【0021】

(1) The line segment lp is a line segment on a straight line orthogonal to the axis c of the optical system.

【0022】

(2) The end point p4 of the line segment lp is the intersection of the line segment lp and the parabolic ru.

【0023】

(3) The end point p6 of the line segment lp is the intersection of the line segment lp and the axis c of the optical system.

【0024】

The reflecting surface has a reflecting surface Rl obtained by rotating a parabolic rl that satisfies all of the following conditions around the axis c of the optical system. Here, the parabola rl and ru include an approximate line of a parabola that passes between a straight line connecting both end points of the parabola and the parabola and is a straight line or a curved line that does not have a bend in the opposite direction to the bend of the parabola.

【0025】

(1) The focal point of the parabola rl is located at the point p0 on the light source.

【0026】

(2) The distance of one end point p1 of the parabola rl from the axis c of the optical system is equal to or longer than the radius required for the installation of the light source.

【0027】

(3) One end point p2 of the parabola rl is a point on a straight line extending by connecting points p0'and p5, and is on the light source side of the line segment lp. Here, p0'and p5 are points that satisfy the following conditions. The point p0'is a point at a position line-symmetrical with p0 on the light source with the line segment lp as the axis of symmetry, and is a point on the virtual image of the light source by the plane Lp. The point p5 is the intersection of the line segment lp and the straight line extending at the critical angle θ'given by Equation 1 with respect to the axis c of the optical system, starting from the point p0 on the light source. Here, n'is the refractive index of the medium of the lens, and n is the refractive index of air.

【0028】

θ = sin^-1(n / n') ... (Equation 1) Further, the reflecting surface has a reflecting surface Ru obtained by rotating a parabola ru that satisfies all of the following conditions around the axis c of the optical system.

【0029】

(1) The focal point of the parabola ru is located at the point p0'on the virtual image of the light source by the plane Lp.

【0030】

(2) One end point p3 of the parabola ru is located on the light source side of the straight line extending by connecting the points p0'and p5, and on the outside (opposite side of the light source) of the parabola rl.

【0031】

(3) One end point p4 of the parabola ru is the intersection of the line segment lp and the parabola ru.

【0032】

Next, the operation of the above configuration will be described. As shown in FIG. 3, the light emitted from the light source is controlled to the light parallel to the axis c of the optical system through two paths. First, the light traveling from the light source in the direction of the reflection surface Rl is controlled to parallel light by reflection because the reflection surface Rl is a curved surface having a focal point on the light source. The light reflected by the reflecting surface Rl is incident on the lens surface Lp almost perpendicularly and is emitted as parallel light (ray A in FIG. 3). Further, the light traveling from the light source between the reflection surface Rl and the point p5 is first totally reflected by the lens surface Lp. Since the reflection surface Ru is configured so that its focus is located on the virtual image of the light source due to the reflection on the lens surface Lp, the light totally reflected by the lens surface Lp is controlled to parallel light by the reflection surface Ru. .. Since the light reflected by the reflecting surface Ru is incident on the lens surface Lp almost perpendicularly, it is emitted as parallel light with almost no deflection due to refraction (light ray B in FIG. 3). In this optical system, the light emitted from the light source between p5 and the axis c of the optical system is not particularly controlled.

【0033】

As described above, it is possible to control and emit almost all the light in the range from the direction of the point p5 to the end point p1 direction of the reflecting surface Rl as parallel light without a lens. Therefore, when it is used as a light source for lighting, it is possible to irradiate a narrow range of light, so that an instrument having high lighting efficiency can be realized. Further, when used for a signal, the entire reflecting surface appears to emit light when viewed from the observer in front of the optical system, and a signal lamp having high brightness can be realized.

【0034】

A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 (a) is an overall view of a downlight luminaire using the LED module of the second embodiment of the present invention, (b) is a sectional view thereof AA', and FIG. 5 is a second embodiment of the present invention. It is sectional drawing which shows the geometric structure of the LED module of a form.

【0035】

As shown in FIG. 4 (a), in this embodiment, the downlight luminaire is composed of an LED module. The LED module includes a large number of light distribution units 2a, one of which is shown in FIG. 2 (b). In FIG. 4 (b), 3 is a printed circuit board, 4 is an LED chip, 5a is a resin reflective frame, 6a is an aluminum vapor deposition surface, and 7 is an epoxy resin.

【0036】

As shown in FIG. 5, the light distribution unit 2a of the LED module has a straight line in which one end point p3 of the parabola ru connects points p0'and p5, in addition to the conditions of the first embodiment. , Located at the intersection of parabolic rl. As a result, the optical system has the smallest diameter within the range of the first embodiment.

【0037】

A third embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 (a) is an overall view of a footlight luminaire using the LED module of the third embodiment of the present invention, (b) is a sectional view thereof AA', and FIG. 7 is a third embodiment of the present invention. It is sectional drawing which shows the geometric structure of the LED module of a form.

【0038】

As shown in FIG. 6A, in this embodiment, the footlight luminaire is composed of an LED module. The LED module has a large number of light distribution units 2b, one of which is shown in Fig. 6 (b). In FIG. 6 (b), 3 is a printed circuit board, 4 is an LED chip, 5b is a resin reflective frame, 11 is a silver-deposited surface, and 7 is an epoxy resin.

【0039】

As shown in FIG. 7, the light distribution unit 2b of the LED module requires the distance of the end point p1 of the parabola rl from the axis c of the optical system in order to install the light source, in addition to the conditions of the first embodiment. Is equal to the radius. Also, the distance of one end point p4 of the parabola ru from the axis c of the optical system is equal to or longer than the distance from the axis c of the optical system of p4'. However, p4'is the intersection of the straight line lp and the straight line extending by connecting the point p0 on the light source and the end point p2 of the parabola rl.

【0040】

As a result, the reflecting surface Ru is hidden behind the reflecting surface Rl when viewed from the light source, and there is no component directly incident on the reflecting surface Ru from the light source. Therefore, when there is light that reaches the reflection surface Ru directly from the light source, the reflection surface Ru has a function of controlling only the incident light from the p0'direction to parallel light, so that the light incident from the direct light source direction is parallel light. It will not be converted to.

【0041】

The LED module of the fourth embodiment of the present invention will be described with reference to FIGS. 8 to 10. FIG. 8 (a) is an overall view of a line-of-sight guide light using the LED module of the fourth embodiment of the present invention, (b) is a sectional view thereof AA', and FIG. 9 is a fourth embodiment of the present invention. FIG. 10 is a cross-sectional view showing the geometrical configuration of the LED module of the above, and FIG. 10 is an operation explanatory view of a fourth embodiment of the present invention.

【0042】

As shown in FIG. 8 (a), in this embodiment, the line-of-sight guide light is composed of an LED module. The LED module has a large number of light distribution units 2c, one of which is shown in Fig. 8 (b). In FIG. 8 (b), 3 is a printed circuit board, 4 is an LED chip, 10 is an aluminum reflective frame, and 7a is an epoxy resin.

【0043】

As shown in FIG. 9, the light distribution portion 2c of the LED module has an inner lens surface LE formed of a convex curved surface centered on the axis c of the optical system and an outer lens surface formed of a flat surface. It has Lp, and has an inner reflecting surface Rl and an outer reflecting surface Ru, each of which has a concave curved surface arranged symmetrically with respect to the axis c of the optical system. In this case, the sealing substance has a lens surface LE obtained by rotating a curve lE that satisfies all of the following conditions around the axis c of the optical system.

【0044】

(1) The end point p5'of the curve lE is from a straight line starting from the point p0 on the light source and extending at an angle of the critical angle θ'given by Equation 1 of the first embodiment with respect to the axis c of the optical system. It exists on the outside (opposite the axis c of the optical system).

【0045】

(2) The end point p6 of the curve lE is a point on the axis c of the optical system, and from the intersection of the perpendicular line drawn from the other end point p5'on the axis c of the optical system and the axis c of the optical system, from the light source. The distance is long.

【0046】

(3) The curve lE is a curve that is convex on the opposite side of the light source from the straight line connecting the points p5'and p6.

【0047】

Further, the sealing resin has a lens surface Lp obtained by rotating a line segment lp that satisfies all of the following conditions around the axis c of the optical system.

【0048】

(1) The line segment lp is a line segment on a straight line passing through the point p5'and orthogonal to the axis c of the optical system.

【0049】

(2) One end point of the line segment lp is the point p5.

【0050】

(3) The end point p4 of the line segment lp is the intersection with the parabola ru.

【0051】

The reflecting surface has a reflecting surface Rl obtained by rotating a parabolic rl that satisfies all of the following conditions around the axis c of the optical system.

【0052】

(1) The focal point of the parabola rl is located at the point p0 on the light source.

【0053】

(2) The distance of one end point p1 of the parabola rl from the axis c of the optical system is equal to or longer than the distance of the end point p5'of the curve lE from the axis c of the optical system.

【0054】

(3) One end point p2 of the parabola rl is located at the intersection of the straight line extending by connecting the points p0'and p5 and the parabola rl. However, the point p0'is a point at a position line-symmetrical with the point p0 on the light source across a straight line including the line segment lp, and is a point on the virtual image of the light source by the plane Lp.

【0055】

Further, the reflecting surface has a reflecting surface Ru obtained by rotating a parabola ru that satisfies all of the following conditions around the axis c of the optical system.

【0056】

(1) The focal point of the parabola ru is located at the point p0'on the virtual image of the light source by the plane Lp.

【0057】

(2) One end point p3 of the parabola ru is located on the light source side of the straight line extending by connecting the points p0'and p5', and on the outside of the parabola rl (opposite to the light source).

【0058】

(3) One end point p4 of the parabola ru is the intersection of the line segment lp and the parabola ru.

【0059】

Next, the operation of the above configuration will be described. As shown in FIG. 10, since the lens surface LE covering the range from the light source to the point p5 is added, in this optical system, the light emitted from the light source between the end point p1 and the point p5'of the reflection surface Rl is not shown. It is controlled by parallel light by the same mechanism as in claim 1. In addition, the light emitted in the direction of the lens surface LE is refracted in the direction of being focused on the axis c of the optical system because the lens surface LE forms a convex lens (light C in FIG. 10). ). Therefore, when the element that controls the light emitted from the light source to the point p5 and the axis c of the optical system to be parallel light is not provided, the light emitted in this range does not become parallel light and the lens surface Lp. It will not be refracted in the direction of diffusion. Therefore, when it is used as a light source for lighting, it is possible to irradiate a narrow range of light and not leak much light to the surroundings, so that an instrument having high lighting efficiency can be realized. In addition, when used as a signal light source, a signal light that emits light over the entire reflecting surface when viewed from the observer in front of the optical system and has high brightness, and does not emit much light and is invisible to observers in other directions. realizable. The description of the light of A and B is the same as that of the first embodiment.

【0060】

A fifth embodiment of the present invention will be described with reference to FIGS. 11 to 13. FIG. 11 (a) is an overall view of the LED module according to the fifth embodiment of the present invention, FIG. 11 (b) is a sectional view thereof AA', and FIG. 12 is the geometry of the LED module according to the fifth embodiment of the present invention. A cross-sectional view showing a specific configuration, FIG. 13 is an operation explanatory view of a fifth embodiment of the present invention.

【0061】

As shown in FIG. 11 (a), the LED module includes a large number of light distribution units 2d, one of which is shown in FIG. 11 (b). In FIG. 11 (b), 3 is a printed circuit board, 4 is an LED chip, 5 is a resin reflective frame, 6 is an aluminum-deposited surface, and 7b is an epoxy resin.

【0062】

As shown in FIG. 12, the light distribution unit 2d of the LED module is a part of an ellipse in which the curve lE satisfies all of the following conditions in addition to the conditions of the fourth embodiment.

【0063】

(1) The ratio of the major axis aE and the minor axis bE of the ellipse almost satisfies the value obtained by Equation 2. Here, n'is the refractive index of the medium of the lens, and n is the refractive index of air.

【0064】

bE / aE = (n ²-n²)^1/2/ n ... (Equation 2) (2) One focal point of the ellipse is located at the point p0 on the LED light source.

【0065】

(3) The center of the ellipse is on the axis c of the optical system on the irradiation direction side from the point p0.

【0066】

(4) The end point p6 of the curve lE is the point on the irradiation direction side of the point p0 of the two intersections of the ellipse and the axis c of the optical system.

【0067】

(5) The end point p5'of the curve lE is one of the intersections of the ellipse and its end diameter bE.

【0068】

Next, the operation of the above configuration will be described. As shown in FIG. 13, it is known that such an elliptical lens having a lens surface LE has a property of controlling light emitted from the focal point into parallel light. In this optical system, the light emitted from the light source between the end points p1 and the point p5'of the reflecting surface Rl is controlled to parallel light by the same mechanism as in claim 1. In addition, the light emitted in the direction of the lens surface LE is controlled to parallel light because the lens surface LE is an elliptical lens having the above-mentioned properties (light C in FIG. 13). Therefore, it is possible to control the light in the range from the axis c of the optical system to the end point p1 direction of the reflecting surface Rl to be almost parallel light and emit it. The description of the light of A and B is the same as that of the first embodiment.

【0069】

A sixth embodiment of the present invention will be described with reference to FIGS. 14 and 15. FIG. 14 (a) is an overall view of the LED module according to the sixth embodiment of the present invention, FIG. 14 (b) is a sectional view thereof AA', and FIG. 15 is the geometry of the LED module according to the sixth embodiment of the present invention. It is sectional drawing which shows the specific structure.

【0070】

As shown in FIG. 14 (a), the LED module includes a large number of light distribution units 2e, one of which is shown in FIG. 14 (b). In FIG. 14 (b), 3 is a printed circuit board, 4 is an LED chip, 5a is a resin reflective frame, 6a is an aluminum-deposited surface, and 7b is an epoxy resin.

【0071】

As shown in FIG. 15, in the light distribution section 2e of the LED module, in addition to the conditions of the fifth embodiment, the distance of one end point p1 of the parabola rl from the axis c of the optical system is a curve lE. It is equal to the distance of the endpoint p5'from the axis c of the optical system. Further, one end point p3 of the parabola ru is located at the intersection of the straight line extending by connecting the points p0'and the point p5'and the parabola rl. As a result, the optical system has the smallest diameter within the range of the fifth embodiment.

【0072】

A seventh embodiment of the present invention will be described with reference to FIGS. 16 and 17. FIG. 16 (a) is an overall view of the LED module according to the seventh embodiment of the present invention, FIG. 16 (b) is a sectional view thereof AA', and FIG. 17 is the geometry of the LED module according to the seventh embodiment of the present invention. It is sectional drawing which shows the specific structure.

【0073】

As shown in FIG. 16 (a), the LED module includes a light distribution unit 2f, and the configuration thereof is shown in FIG. 16 (b). In FIG. 16 (b), 3 is a printed circuit board, 4 is an LED chip, 5b is a resin reflective frame, 6b is an aluminum-deposited surface, and 7b is an epoxy resin.

【0074】

As shown in FIG. 17, in the light distribution section 2f of the LED module, the distance from the optical system axis c at one end point p1 of the parabola rl is the distance from the optical system axis c at the end point p5 of the curve lE. Is equal to. Also, the distance of one end point p4 of the parabola ru from the axis c of the optical system is equal to or longer than the distance from the axis c of the optical system of p4'. However, p4'is the intersection of the line segment lp and the straight line extending by connecting the point p0 on the light source and the end point p2 of the parabola rl.

【0075】

As a result, the reflecting surface Ru is hidden behind the reflecting surface Rl when viewed from the light source, and there is no component directly incident on the reflecting surface Ru from the light source. Therefore, when there is light that reaches the reflection surface Ru directly from the light source, the reflection surface Ru has a function of controlling only the incident light from the p0'direction to parallel light, so that the light incident from the direct light source direction is parallel light. It will not be converted to.

【0076】

The LED module having the above configuration can be applied to a lighting fixture other than the lighting fixture shown in the embodiment. Further, the reflective frame may be made of metal as well as resin, and the lens may be made of resin other than epoxy resin.

【0077】

[Effect of the invention]

According to the LED module according to claim 1 of the present invention, the light emitted from the light source is controlled to the light parallel to the axis c of the optical system through two paths. As a result, most of the light in the range from the direction of the point p5 to the end point p1 direction of the reflecting surface Rl can be controlled to be parallel light and emitted without a lens. Therefore, when it is used as a light source for lighting, it is possible to irradiate a narrow range of light, so that an instrument having high lighting efficiency can be realized. Further, when used for a signal, the entire reflecting surface appears to emit light when viewed from the observer in front of the optical system, and a signal lamp having high brightness can be realized.

【0078】

Further, since most of the light totally reflected by the lens surface can be emitted by one reflection by the reflecting surface, the loss of light due to repeated reflection is small and the instrument efficiency is good. Moreover, since a convex lens is not formed at all, a thin lighting fixture or a signal light can be realized, and it is easy to manufacture.

【0079】

In claim 2, since one end point p3 of the parabola ru is located at the intersection of the straight line extending by connecting the points p0'and p5 and the parabola rl, the diameter of the optical system is the smallest. Therefore, the LED module can be miniaturized. In addition, when realizing a module in which a large number of LEDs are mounted, the mounting density can be increased. In addition, since the shape of the reflective surface is simpler, it is easy to manufacture.

【0080】

According to claim 3, the reflecting surface Ru is hidden in the shadow of the reflecting surface Rl when viewed from the light source, and the light flux that directly reaches the reflecting surface Ru from the light source disappears, so that the parallel light can be controlled more efficiently. Further, since the reflecting surface Rl is closest to the light source, the solid angle when the reflecting surface Rl is viewed from the light source is the largest, and the light flux in a wider range can be controlled to parallel light.

【0081】

According to the LED module according to claim 4 of the present invention, since the lens surface LE covering the range from the light source to the point p5 is added, in this optical system, between the end point p1 and the point p5'of the reflection surface Rl from the light source. The emitted light is controlled to parallel light by the same mechanism as in claim 1. In addition, the light emitted in the direction of the lens surface LE is refracted in the direction of being focused on the axis c of the optical system because the lens surface LE forms a convex lens, and reaches the lens surface and diffuses. It can collect the light that was being used. Therefore, when it is used as a light source for lighting, it is possible to irradiate a narrow range of light and not leak much light to the surroundings, so that an instrument having high lighting efficiency can be realized. In addition, when used as a signal light source, a signal lamp that emits light over the entire reflecting surface when viewed from the observer in front of the optical system and has high brightness, and does not emit much light and is invisible to observers in other directions. realizable.

【0082】

Further, since most of the light totally reflected by the lens surface can be emitted by one reflection by the reflecting surface, the loss of light due to repeated reflection is small and the instrument efficiency is good. Moreover, since the lens shape is simpler than that of the conventional example 2, it is easy to manufacture.

【0083】

In claim 5, the light emitted from the light source between the end points p1 and the point p5'of the reflecting surface Rl is controlled to parallel light by the same mechanism as in claim 1. In addition, the light emitted in the direction of the lens surface LE is controlled to parallel light because the lens surface LE is an elliptical lens having a property of controlling the light emitted from the focal point to parallel light. Therefore, it is possible to control the light in the range from the axis c of the optical system to the end point p1 direction of the reflecting surface Rl to be almost parallel light and emit it.

【0084】

In claim 6, the distance of one end point p1 of the parabola rl from the axis c of the optical system is equal to the distance of the end point p5'of the curve lE from the axis c of the optical system, and one end point p3 of the parabola ru is Since it is located at the intersection of the straight line extending by connecting the points p0'and the point p5'and the parabolic rl, the diameter of the optical system is the smallest. Therefore, the LED module can be miniaturized. In addition, when realizing a module in which a large number of LEDs are mounted, the mounting density can be increased. In addition, since the shape of the reflective surface is simpler, it is easy to manufacture.

【0085】

In claim 7, the reflecting surface Ru is hidden behind the reflecting surface Rl when viewed from the light source, and there is no luminous flux that reaches the reflecting surface Ru directly from the light source, so that the light emitted from the light source is controlled to parallel light more efficiently. it can. Further, since the reflecting surface Rl is closest to the light source, the solid angle when the reflecting surface Rl is viewed from the light source is the largest, and the light flux in a wider range can be controlled to parallel light.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing which shows the geometrical structure of the LED module of 1st Embodiment of this invention.

[Figure 2]

(a) is an overall view of a signal lamp using the LED module according to the first embodiment of the present invention, (b) is an enlarged view of a lamp portion, and (c) is an AA'cross-sectional view of (b).

[Fig. 3]

It is an operation explanatory drawing of the 1st Embodiment of this invention.

[Fig. 4]

(a) is an overall view of a downlight luminaire using the LED module of the second embodiment of the present invention, and (b) is a sectional view thereof AA'.

[Fig. 5]

It is sectional drawing which shows the geometrical structure of the LED module of the 2nd Embodiment of this invention.

[Fig. 6]

An overall view of a footlight luminaire using the LED module of the third embodiment of the present invention, (b) is a sectional view thereof AA'.

[Fig. 7]

It is sectional drawing which shows the geometrical structure of the LED module of the 3rd Embodiment of this invention.

[Fig. 8]

(a) is an overall view of the line-of-sight guide light using the LED module of the fourth embodiment of the present invention, and (b) is a sectional view thereof AA'.

[Fig. 9]

It is sectional drawing which shows the geometrical structure of the LED module of 4th Embodiment of this invention.

[Fig. 10]

It is an operation explanatory drawing of the 4th Embodiment of this invention.

[Fig. 11]

(a) is an overall view of the LED module according to the fifth embodiment of the present invention, and (b) is a sectional view thereof AA'.

[Fig. 12]

It is sectional drawing which shows the geometrical structure of the LED module of the 5th Embodiment of this invention.

[Fig. 13]

It is an operation explanatory drawing of the 5th Embodiment of this invention.

[Fig. 14]

(a) is an overall view of the LED module according to the sixth embodiment of the present invention, and (b) is a sectional view thereof AA'.

[Fig. 15]

It is sectional drawing which shows the geometrical structure of the LED module of 6th Embodiment of this invention.

[Fig. 16]

(a) is an overall view of the LED module according to the seventh embodiment of the present invention, and (b) is a sectional view thereof AA'.

[Fig. 17]

It is sectional drawing which shows the geometrical structure of the LED module of 7th Embodiment of this invention.

[Fig. 18]

It is sectional drawing of the LED module of the prior art example 1.

[Fig. 19]

It is sectional drawing of the LED light source of the prior art example 2.

[Explanation of symbols]

4 LED chip 5 Resin reflective frame 6 Aluminum vapor deposition surface 7 Epoxy resin c Optical system axis Lp lens surface lp line segment Rl reflective surface rl parabola Ru reflective surface ru parabola θ'critical angle p0 Point on the light source p1 Points outside the radius required to install the light source A point on the straight line connecting p2 p0'and p5, which is on the light source side of the line segment lp. A point on the light source side of the straight line connecting p3 p0'and p5 and outside the parabola rl p4 Intersection of parabola ru and line segment lp The intersection of a straight line and a line segment lp that starts at p5 point p0 and extends at a critical angle θ'. p0'Point on the virtual image of the light source due to the lens surface Lp