JPH0799343A - Light emitting diode and laminated light emitting diode - Google Patents

Abstract

PURPOSE:To provide a light emitting diode and laminated light emitting diode capable of attaining high front surface luminance by efficiently mixing and radiating light beams having different luminescent colors. CONSTITUTION:A reaction type light emitting diode 120 emitting green color beams is arranged behind (rear stage) another light emitting diode 110 wherein an optical surface 114 having multiple dotted reaction parts formed on a concave transmission surface is arranged on the position opposite to a light emitting surface of a light emitting element emitting red color beams to be contained in a case 130 which is filled up with a light transmitting material 140 later.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode used in displays, sensors and the like.

[0002]

2. Description of the Related Art A conventional light emitting diode will be described with reference to FIG. FIG. 27 is a schematic sectional view of a conventional light emitting diode.

A conventional light emitting diode 500 includes a light emitting element 501a which emits red light and a light emitting element 5 which emits green light.
01b, a lead frame 502a for supplying electric power to the light emitting elements 501a and 501b, a lead frame 502b for supplying electric power to the light emitting element 501a, and a light emitting element 501.
It has a lead frame 502c for supplying electric power to b, a light diffusing light transmitting material 503, a light transmitting material 504, and a lens surface 505. Light emitting elements 501a and 501b
Are arranged on the lead frame 502a, and the light emitting element 5
01a is a lead frame 502b by a wire 506a
The light emitting element 501b is electrically connected to the lead frame 502c by a wire 506b. Light emitting elements 501a and 501b and wires 506a and 506
Part of b is sealed with the light diffusing light transmitting material 503 that is laid on the lead frame 502a. Also,
Light diffusing light transmitting material 503 and wires 506a, 50
6b and lead frames 502a, 502b, 502c
The front end portion of is integrally sealed with a light transmissive material 504. The lens surface 505 is formed in a convex shape on the surface of the light transmissive material 504 on the side facing the light emitting surfaces of the light emitting elements 501a and 501b.

The light emitting diode 500 having the above structure is
After the red light emitted by the light emitting element 501a and the green light emitted by the light emitting element 501b are diffused and mixed by the light diffusing light transmissive material 503, they are condensed by the lens surface 505 and emitted to the outside.
Accordingly, it is possible to radiate lights having different emission colors from the lens surface 505 to the outside with substantially the same light distribution characteristics, and to radiate mixed high-luminance lights without color unevenness. Further, by controlling the currents flowing through the light emitting elements 501a and 501b, respectively, the light emitted to the outside can be continuously changed from red light to green light.

[0005]

However, in the light emitting diode 500 having the above structure, the light emitting element 501 is used.
The light emitted by a and 501b is a light diffusing light transmitting material 503.
After being sufficiently diffused by the surface of the light diffusing material 503, the light is uniformly emitted from the surface of the light diffusing light transmitting material 503. In addition, the light emitting element 501a,
A part of the light emitted by 501 b is a light diffusing light transmitting material 50.
Absorbed by 3. Therefore, the lens surface 50 becomes parallel light.
The light that can be radiated to the outside from the light emitting element 501 is light emitting elements 501a, 501
It is only a small part of the light emitted by b. In addition, at present, a light emitting element that emits blue light has a significantly smaller light emission output than a light emitting element that emits red light or a light emitting element that emits green light.
Further, since the radiative efficiencies of the lights of the respective colors are the same, the radiative efficiency of blue, which has a small emission output, also becomes small, and the absolute radiant intensity of blue becomes small. For example, when a light-emitting diode that emits white light is manufactured using two light-emitting elements that emit blue light, one light-emitting element that emits green light, and one light-emitting element that emits red light, blue light is emitted. The front luminous intensity of a lens-type light emitting diode that uses one light emitting element and does not use the light diffusing light transmissive material 503 for deriving parallel light is about 30 mcd, whereas the light emitting diode produced emits light. The amount of light is about 5 mcd.

Further, the light emitting diode 50 having the above structure
At 0, the light diffusing light transmissive material 503 serves as a substantial light source, but since the light diffusing light transmissive material 503 is larger than the lens surface 505, sufficient optical control cannot be performed. In addition,
In the reflection type light emitting diode in which the reflection surface is formed at the position facing the light emitting surface of the light emitting element, the light diffusing light transmitting material 50
The above structure is not suitable because 3 blocks the reflected light.

Therefore, the conventional light emitting diode 500 having the above structure has a problem that the light collection efficiency is poor and a high front luminance cannot be obtained.

The present invention has been made in view of the above circumstances, and provides a light emitting diode and a stacked light emitting diode capable of obtaining high front luminance by efficiently mixing and emitting lights having different emission colors. That is the purpose.

[0009]

In order to achieve the above object, a light emitting diode according to the present invention comprises a light emitting element and an optical surface arranged at a position facing the light emitting surface of the light emitting element. The optical surface reflects a part of the light emitted from the light emitting element and radiates the light to the outside, and transmits a part of the light incident from the back of the optical surface to the outside. Is.

A light emitting diode according to a second aspect of the invention is
The invention according to claim 1 is characterized in that the optical surface is formed by partially forming a reflection portion on a concave transmission surface.

A light emitting diode according to the invention of claim 3 is
The invention according to claim 2 is characterized in that the optical surface is a concave transmission surface on which a large number of reflecting portions are formed in a dot shape.

A light emitting diode according to a fourth aspect of the invention is
The invention according to claim 2 is characterized in that the optical surface is a concave transmissive surface on which reflective portions are formed in a mesh shape.

The light emitting diode according to the invention of claim 5 is
The invention according to claim 2 is characterized in that the optical surface is a concave transmissive surface on which reflective portions are radially formed.

The light emitting diode according to the invention of claim 6 is
The invention according to claim 1 is characterized in that the optical surface is a concave half mirror formed by a semitransparent thin film reflecting surface.

The light emitting diode according to the invention of claim 7 is
In the invention according to claim 1, 2, 3, 4, 5 or 6,
On the back side of the light emitting element, a light reflected by the optical surface and a radiation surface that radiates light transmitted through the optical surface to the outside,
A light transmissive material is filled between the radiation surface and the optical surface.

The light emitting diode according to the invention of claim 8 is
In the invention according to claim 7, there is an incident surface on the back side of the optical surface to which light emitted from the back of the optical surface is incident, and a light transmissive material is provided between the incident surface and the optical surface. It is characterized by being filled.

The light emitting diode according to the invention of claim 9 is
A light emitting element and an optical surface arranged at a position facing a light emitting surface of the light emitting element, wherein the optical surface reflects light emitted by the light emitting element and radiates the light to the outside, and behind the optical surface. It is characterized in that a part of the light incident from is transmitted and radiated to the outside.

A light emitting diode according to a tenth aspect of the present invention is the light emitting diode according to the ninth aspect, wherein the optical surface is located at a position facing the light emitting surface of the light emitting element, and the central reflective surface. A plurality of annular reflecting surfaces each provided with a step around each of them, between the central reflecting surface and the adjacent annular reflecting surface, and next to the annular reflecting surface. It is characterized by having a concave shape having a plurality of transparent surfaces provided between the matching objects.

According to an eleventh aspect of the invention, in the light emitting diode according to the tenth aspect, the central reflecting surface and the plurality of annular reflecting surfaces are the central reflecting surface when viewed from the light emitting surface of the light emitting element. It is characterized in that it is arranged so that a gap does not occur between the adjacent annular reflecting surface and the adjacent adjacent annular reflecting surfaces.

A light emitting diode according to a twelfth aspect of the present invention is the light emitting diode according to the tenth or eleventh aspect, wherein the plurality of transmission surfaces are all located on the same plane, and the central reflection surface and the plurality of annular reflection surfaces are the same. It is characterized in that it is located closer to the light emitting element than the same plane.

According to a thirteenth aspect of the present invention, in the light emitting diode according to the tenth, eleventh or twelfth aspect of the invention, the central reflecting surface and the plurality of annular reflecting surfaces are concave. .

According to a fourteenth aspect of the present invention, in the light emitting diode according to the tenth, eleventh or twelfth aspect of the invention, the central reflecting surface is convex and the plurality of annular reflecting surfaces are concave. It is what

A light emitting diode according to a fifteenth aspect of the present invention is the light emitting diode according to the ninth aspect, the tenth aspect, the eleventh aspect, the eleventh aspect, the thirteenth aspect, the thirteenth aspect, and the light reflected by the optical surface on the back side of the light emitting element. It has a radiation surface for radiating the light transmitted through to the outside, and a light transmissive material is filled between the radiation surface and the optical surface.

A light emitting diode according to a sixteenth aspect of the present invention is the light emitting diode according to the fifteenth aspect of the present invention, which has an incident surface on the back side of the optical surface for allowing light emitted from behind the optical surface to enter. A light-transmissive material is filled between the surface and the optical surface.

The light emitting diode according to the invention of claim 17 comprises a light emitting element and an optical surface arranged at a position facing the light emitting surface of the light emitting element, wherein the optical surface has a wavelength emitted by the light emitting element. While reflecting the light of and radiating to the outside,
It is characterized in that light having a wavelength different from that of the light emitted from the light emitting element which is incident from behind the optical surface is transmitted and radiated to the outside.

The light emitting diode according to the eighteenth aspect of the present invention is the light emitting diode according to the seventeenth aspect, wherein the optical surface is a concave dichroic mirror formed by laminating thin films having different refractive indexes. To do.

A light emitting diode according to a nineteenth aspect of the present invention is the light emitting diode according to the seventeenth or eighteenth aspect, wherein the light reflected by the optical surface on the back side of the light emitting element and the light transmitted through the optical surface are radiated to the outside. And a light transmissive material is filled between the radiation surface and the optical surface.

A light emitting diode according to a twentieth aspect of the present invention is the light emitting diode according to the nineteenth aspect of the present invention, which has an incident surface on the back side of the optical surface for allowing light emitted from behind the optical surface to enter. A light-transmissive material is filled between the surface and the optical surface.

According to a twenty-first aspect of the present invention, there is provided a laminated type light emitting diode as described in the following aspects: 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 1
At least one of the light-emitting diodes described in 8, 19, or 20 and a light source are laminated so that the light-emitting diode or the light source in the subsequent stage is located behind the optical surface of the light-emitting diode in the previous stage, and the light source is located in the last stage. It is characterized by being arranged in a shape.

According to a twenty-second aspect of the present invention, there is provided the stacked type light emitting diode according to the twenty-first aspect, wherein the at least one light emitting diode and the light source emit light in different wavelength ranges. It is a thing.

According to the stacked type light emitting diode of the twenty-third aspect of the present invention, in the invention of the twenty-first or twenty-second aspect, the at least one light emitting diode and the light source emit light having different light distribution characteristics. It is a feature.

According to a twenty-fourth aspect of the present invention, in the stacked type light-emitting diode according to the twenty-first aspect, the light-emitting diode which emits green light is arranged behind the optical surface of the light-emitting diode which emits blue light. A light source that emits red light is arranged behind the optical surface of a light emitting diode that emits light.

According to a twenty-fifth aspect of the present invention, in the stacked type light-emitting diode according to the twenty-first, twenty-second, twenty-third or twenty-fourth aspect of the present invention, when there are a plurality of the light-emitting diodes, the light-emitting diodes in adjacent stages and the light-emitting diodes are adjacent to each other. A light-transmissive material is filled between the diode and the light source adjacent to the diode.

According to a twenty-sixth aspect of the present invention, in the stacked type light-emitting diode according to the twenty-first, twenty-second, twenty-third or twenty-fourth aspect, when there are a plurality of the light-emitting diodes, an optical path between the light-emitting diodes in adjacent stages, and An optical path between the light emitting diode and the light source adjacent to the light emitting diode is filled with a light transmissive material.

[0035]

According to the light emitting diode of the present invention, a part of the light emitted from the light emitting element is reflected by the optical surface and emitted to the outside, and a part of the light incident from the back of the optical surface is transmitted. Since the light is radiated to the outside, the light emitted from the light emitting element and the light incident from behind the optical surface can be efficiently mixed and radiated to the outside, so that a high front luminance can be obtained.

The light emitting diode according to the second aspect of the invention is
A part of the light emitted by the light emitting element is reflected by a partially formed reflecting portion of the optical surface and radiated to the outside, and a part of the light incident from behind the optical surface is transmitted through the optical surface. Since the light is transmitted through the surface and radiated to the outside, the same operation as the invention according to claim 1 is achieved.

The light emitting diode according to the invention of claim 3 is
A part of the light emitted by the light-emitting element is reflected by a plurality of reflecting portions formed in a dot shape on the optical surface and radiated to the outside, and a part of the light incident from the back of the optical surface is Since the light is transmitted through the transparent surface and is radiated to the outside, the same operation as that of the first aspect of the invention is achieved.

A light emitting diode according to the invention of claim 4 is
A part of the light emitted by the light emitting element is reflected by a reflection portion formed in a mesh shape of the optical surface and emitted to the outside, and a part of the light incident from behind the optical surface is transmitted through the optical surface. Since the light is transmitted through the surface and radiated to the outside, the same operation as the invention according to claim 1 is achieved.

The light emitting diode according to the invention of claim 5 is
A part of the light emitted by the light emitting element is reflected by a radially formed reflecting portion of the optical surface and radiated to the outside, and a part of the light incident from behind the optical surface is transmitted through the optical surface. Since it is transmitted through and is radiated to the outside, the same operation as the invention according to claim 1 is achieved.

A light emitting diode according to the invention of claim 6 is
A part of the light emitted from the light emitting element is reflected by a half mirror forming the optical surface and emitted to the outside, and a part of the light incident from the back of the optical surface is formed by the half mirror forming the optical surface. Since it is transmitted and radiated to the outside, the same operation as the invention according to claim 1 is achieved.

A light emitting diode according to the invention of claim 7 is
With the above configuration, the same operation as the invention according to claim 1 is achieved.

The light emitting diode according to the invention of claim 8 is
Provided on the back side of the optical surface is an incident surface for entering light emitted from behind the optical surface, and by filling a light transmissive material between the incident surface and the optical surface, It is possible to prevent the light incident from the back from being refracted at the interface of the optical surfaces to be emitted in an ineffective direction and from being reflected to reduce the transmittance.

A light emitting diode according to a ninth aspect of the invention is
The light emitted by the light emitting element is reflected by the optical surface to be emitted to the outside, and at the same time, the light emitted from the light emitting element and the optical surface are transmitted because a part of the light incident from behind the optical surface is transmitted and emitted to the outside. It is possible to efficiently mix the color of light incident from the back of the light source and radiate the light to the outside, and thus obtain a high front luminance.

According to a tenth aspect of the present invention, there is provided a light emitting diode, wherein a light emitted from the light emitting element is provided with a central reflecting surface arranged at a position facing the light emitting surface of the light emitting element, and a step is formed around the central reflecting surface. While being reflected by the plurality of annular reflecting surfaces provided with steps between each of the provided and arranged,
A plurality of transmitting surfaces provided between the central reflecting surface and the annular reflecting surface adjacent to the central reflecting surface, and between adjacent ones of the annular reflecting surfaces for a part of the light incident from behind the optical surface. Since the light is transmitted through, the same operation as the invention according to claim 9 is achieved.

According to an eleventh aspect of the invention, in the light emitting diode, the central reflecting surface and the plurality of annular reflecting surfaces are the central reflecting surface and the annular reflecting surface adjacent to the central reflecting surface when viewed from the light emitting surface of the light emitting element. Since the gap is not formed between the surface and the adjacent ones of the annular reflecting surfaces, almost all luminous flux of the light emitted from the light emitting element can be radiated forward.

According to a twelfth aspect of the present invention, in the light emitting diode, the plurality of transmitting surfaces are all located on the same plane, and the central reflecting surface and the plurality of annular reflecting surfaces are closer to the light emitting element than the same plane. Since it is located, only the transmissive surface is formed on the bottom surface of the optical surface, and the reflective surface is not formed. Therefore, even when they are arranged in an overlapping manner, the lower surface portion of the optical surface comes into contact with each other, so that the reflecting portion is not damaged.

The light emitting diode according to the thirteenth aspect of the present invention has the central reflecting surface and the plurality of annular reflecting surfaces which are concave, and has the same effect as the invention according to the ninth aspect.

In the light emitting diode of the fourteenth aspect of the present invention, the central reflecting surface is convex and the plurality of annular reflecting surfaces are concave, so that the light emitted from the light emitting element is reflected by the central reflecting surface. Is reflected by any of the plurality of annular reflecting surfaces and then radiated to the outside, so that the light reflected by the central reflecting surface can be radiated to the outside without being absorbed by the light emitting element.

The light emitting diode of the invention according to a fifteenth aspect has the same operation as the invention according to the ninth aspect because of the above configuration.

In the light emitting diode of the sixteenth aspect of the present invention, an incident surface on which the light emitted from the back of the optical surface is incident is provided on the back side of the optical surface, and the incident surface is provided between the incident surface and the optical surface. By filling with a light-transmissive material, it is possible that light incident from behind the optical surface is refracted at the interface of the optical surface and is emitted in an ineffective direction, and that light is reflected to reduce the transmittance. Can be prevented.

According to a seventeenth aspect of the present invention, in a light emitting diode, the light of the wavelength emitted by the light emitting element is reflected by the optical surface and emitted to the outside, and is different from the light emitted by the light emitting element incident from behind the optical surface. Since the light of the wavelength is transmitted and radiated to the outside, the light emitted from the light emitting element and the light incident from behind the optical surface can be efficiently mixed and radiated to the outside, thus obtaining a high front luminance. You can

In the light emitting diode of the eighteenth aspect of the present invention, the optical surface is a concave dichroic mirror formed by laminating thin films having different refractive indexes, and thus the same operation as that of the seventeenth aspect of the invention is achieved. Play.

The light emitting diode of the invention according to claim 19 has the same operation as that of the invention according to claim 17 due to the above-mentioned structure.

In the light emitting diode of the twentieth aspect of the present invention, an incident surface on which the light emitted from the back of the optical surface is incident is provided on the rear side of the optical surface, and the incident surface is provided between the incident surface and the optical surface. By filling with a light-transmissive material, it is possible that light incident from behind the optical surface is refracted at the interface of the optical surface and is emitted in an ineffective direction, and that light is reflected to reduce the transmittance. Can be prevented.

According to the laminated type light emitting diode of the twenty-first aspect of the present invention, by virtue of the above-mentioned constitution, it is possible to efficiently mix colors of several kinds of light and radiate them to the outside, and thus to obtain high front luminance. .

In the laminated light emitting diode according to the twenty-second aspect of the present invention, since the at least one light emitting diode and the light source emit light in different wavelength ranges, it is possible to emit light of various colors.

In the laminated light emitting diode according to the twenty-third aspect of the invention, since the at least one light emitting diode and the light source emit light having different light distribution characteristics, it is possible to emit light having various light distribution characteristics. .

Since the laminated type light emitting diode according to the twenty-fourth aspect of the present invention is configured as described above, it is possible to emit light of all colors by varying the light amounts of blue light, green light and red light. .

According to a twenty-fifth aspect of the present invention, in the case where there are a plurality of light emitting diodes, light is transmitted between the light emitting diodes in adjacent stages and between the light emitting diode and the light source adjacent thereto. By filling with a conductive material, it is possible to prevent light incident from the back of the optical surface from being refracted at the interface of the optical surface to be emitted in an ineffective direction and from being reflected to reduce the transmittance. be able to.

According to a twenty-sixth aspect of the present invention, in the case of a plurality of the light emitting diodes, when there are a plurality of the light emitting diodes, an optical path between the light emitting diodes in adjacent stages, and between the light emitting diode and the light source adjacent thereto. By filling the optical path with the light transmissive material, the same effect as the invention of claim 25 is achieved.

[0061]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic sectional view of a stacked light emitting diode which is a first embodiment of the present invention. Figure 2
FIG. 2 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG. 1. FIG. 3 is a schematic rear view of the light emitting diode shown in FIG.

The stacked type light emitting diode 100 according to the first embodiment of the present invention, as shown in FIG.
A reflection type light emitting diode 120, which is a light source, is further arranged behind (rear stage) 10 and housed in a case 130, and then the case 130 is filled with a light transmissive material 140.

As shown in FIG. 2, the light emitting diode 110 includes a light emitting element 111 that emits red light and a light emitting element 111.
Lead frames 112a, 112b for supplying power to the
A light-transmissive material 113, an optical surface 114 formed in the shape of a paraboloid of revolution with the light emitting element 111 as a focal point, and a radiation surface 1.
15 and. The light emitting element 111 is a lead frame 1.
It is arranged at the tip of 12a and is electrically connected to the lead frame 112b by a wire 116. The light emitting element 111, the tip portions of the lead frames 112a and 112b, and the wire 116 are integrally sealed with a light transmissive material 113. The light transmissive material 140 used to fill the inside of the case 130 preferably has the same refractive index as the light transmissive material 113. This is because the light emitted from the reflection type light emitting diode 120 is the optical surface 1.
Refracting at the interface of 14 and radiating in an invalid direction,
This is to prevent reflection and decrease in transmittance. As shown in FIG. 3, the optical surface 114 is formed by partially mirror-finishing the convex surface of the light transmissive material 113 by plating, metal deposition, or the like, and forming a large number of reflecting portions 114a in a dot shape.
It is arranged on the side facing the light emitting surface of the light emitting element 111. The emission surface 115 is formed in a flat shape on the back surface side of the light emitting element 111.

The point that the reflection type light emitting diode 120 which is a light source is different from the light emitting diode 110 is that a light emitting element which emits green light is used in place of the light emitting element 111 which emits red light, and a reflection portion of the light transmissive material 113. Instead of the optical surface 114 in which a large number of dots 114a are formed, a concave reflection surface 121 formed by mirror-finishing the entire convex surface of the light transmissive material by plating, metal deposition or the like is used. Incidentally, in the reflection type light emitting diode 120, those having the same function as the light emitting diode 110 are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The laminated light emitting diode 10 having the above structure.
At 0, a part of the red light emitted from the light emitting element 111 of the light emitting diode 110 is reflected by the reflecting portion (black dot portion in FIG. 3) 114a formed in a large number of points on the optical surface 114, and then from the emitting surface 115. A part of the green light, which is emitted as parallel light to the outside and is parallel light emitted by the reflection type light emitting diode 120, is part of the reflection part 1 of the optical surface 114 of the light emitting diode 110.
After entering and transmitting the part where 14a is not formed, it is emitted to the outside as parallel light from the emitting surface 115.

According to the first embodiment of the present invention, the red light emitted by the light emitting element 111 of the light emitting diode 110 is emitted by the optical surface 1.
Green light emitted by the reflective light emitting diode 120 is reflected by the reflecting portions 114a formed in a large number of 14 points, and is transmitted through the portions of the optical surface 114 on which the reflecting portions 114a are not formed, respectively, and is emitted. Are emitted with an equal light distribution. Since the dot-shaped reflecting portions 114a formed on the optical surface 114 are individually small, the light emitting diode 1
The red light emitted from the light emitting element 111 and the green light emitted from the reflection type light emitting diode 120 can be efficiently mixed and radiated to the outside, and thus a high front luminance can be obtained. The area ratio of the optical surface 114 and the reflection portion 114a formed on the optical surface 114 may be determined according to the output of the light emitting element and the application, and for example, the area of the reflection portion 114a formed on the optical surface 114 By making the area of the surface 114 approximately half, the ratio of the red light emitted by the light emitting diode 110 and the green light emitted by the reflection type light emitting diode 120 can be set to 1: 1.

Further, the light emitting element 1 of the light emitting diode 110
The light emitted from the stacked light emitting diode 100 can be continuously changed from red to green by controlling the current flowing through the light emitting elements of the reflective light emitting diode 120 and the light emitting element of the reflective light emitting diode 120.

Further, by filling the space between the light emitting diode 110 and the reflection type light emitting diode 120 with the light transmissive resin 140, the reflection portion 114a of the optical surface 114 of the light emitted by the reflection type light emitting diode 120 is formed. It is possible to prevent the light incident on the non-existing portion from being refracted at the interface of the optical surface 114 to be emitted in an ineffective direction and from being reflected to reduce the transmittance.

The present invention is not limited to the first embodiment, but various modifications can be made within the scope of the invention. For example, in the first embodiment, the case where the red light and the green light are mixed and emitted has been described. However, the present invention is not limited to this, and the green light and the blue light may be mixed and emitted. Further, a plurality of light emitting elements may be used for the light emitting diodes 110 and 120, and in this case, light emitting elements having different emission wavelengths may be used in combination.

In the first embodiment, the optical surface 114 has been described as having a large number of reflecting portions 114a formed in a dot shape, but the present invention is not limited to this. As shown in FIG. 4, the reflecting portion 114b is formed in a mesh shape, or as shown in FIG.
What is formed by the reflective portion and the transmissive portion, such as the one in which 4c is radially formed, may be used. Further, the fineness of the reflecting portion and the transmitting portion may be determined depending on the application. In addition, when the convex surface of the light transmissive material 113 is mirror-finished by plating or metal evaporation, a half mirror which is a semi-transmissive thin film reflective surface may be used by controlling the amount of evaporation. In this case, a part of the light emitted from the light emitting element 111 is reflected by the half mirror and emitted from the emission surface 115, and a part of the light emitted from the reflective light emitting diode 120 passes through the half mirror and is emitted from the emission surface 115. Therefore, the same operation and effect as those of the first embodiment are achieved. Further, the reflecting portion formed in a dot shape on the optical surface 114 may be a half mirror, or the portion of the optical surface 114 where the reflecting portion is not formed may be a half mirror. In addition, the optical surface 114 is not limited to a paraboloid of revolution.

Further, in the first embodiment, the case in which the case 130 is filled with the light transmissive material 140 has been described, but the present invention is not limited to this, and the light emitting diode 11 is used.
It suffices that only the part of the optical path between 0 and the reflection type light emitting diode 120 is filled with the light transmissive material 140.
In addition, the light emitting diode 110 and the reflection type light emitting diode 1
An optical system such as a lens is arranged between the laminated light emitting diode 10 and the optical surface 114 in order to adjust the incident angle of the light incident on the optical surface 114.
When designing an optical system of 0, the case 130 may not be filled with the light transmissive material 140.

For example, the optical surface 11 of the light emitting diode 110 such as the laminated light emitting diode 150 shown in FIG.
4 is provided with an incident surface 151 so that the light emitted from the reflection type light emitting diode 120 is incident at a substantially right angle, and a space between the optical surface 114 and the incident surface 151 of the light emitting diode 110 is filled with a light transmissive material 113. In this case, the light emitted from the reflective light emitting diode 120 can be incident on the incident surface 151 without being refracted and emitted in an ineffective direction, and can be transmitted through the optical surface 114 without interfacial refraction. Also,
When the planar optical surface 172 is arranged around the concave optical surface 171 of the light emitting diode 170 as in the stacked light emitting diode 160 shown in FIG. 7, light emitted by the reflective light emitting diode 120 is similarly emitted. The light can be made incident on the planar optical surface 172 and transmitted without being refracted and emitted in an invalid direction. Further, like the stacked light emitting diode 180 shown in FIG. 8, the light emitting diode 1 shown in FIG.
An incident surface 181 is provided behind 70 so that the light emitted from the reflection type light emitting diode 120 is incident at a substantially right angle, and a light transmitting material 113 is provided between the optical surfaces 171 and 172 of the light emitting diode 170 and the incident surface 181. When filled, the light emitted from the reflection type light emitting diode 120 can be incident on the incident surface 181 without being refracted at the interface and can be transmitted through the optical surfaces 171 and 172.

In the first embodiment, the reflection type light emitting diode 120 is used as the light source. However, the light source is not limited to this, and a lens is used as the light source like the laminated type light emitting diode 190 shown in FIG. The light emitting diode 191 may be used. The lens type light emitting diode 191 collects the light emitted by the light emitting element due to the difference in the refractive index at the lens interface and radiates the light from the lens surface 192.
Do not fill with the same light transmissive material as 91. Therefore, it is desirable to design the optical system of the stacked light emitting diode 190 in consideration of the interface reflection of the light incident on the optical surface 114, such as the structure similar to that of the stacked light emitting diode shown in FIG. 6 or 7. . In addition, the reflection type light emitting diode 1
Instead of 20, a cold cathode tube, an EL lamp or the like may be used as a light source.

Further, in the first embodiment, the light emitting diode 110 having the space between the emitting surface 115 and the optical surface 114 filled with the light transmissive material 113 has been described, but the present invention is not limited to this. The space between 115 and the optical surface 114 may be hollow.

Next, FIG. 10 shows the second embodiment of the present invention.
Will be described with reference to. FIG. 10 is a schematic sectional view of a stacked light emitting diode that is a second embodiment of the present invention.

In the stacked light emitting diode 200 according to the second embodiment of the present invention, as shown in FIG. 10, the second light emitting diode 220 is arranged behind the first light emitting diode 210 and the second light emitting diode 220 is arranged behind the second light emitting diode 220. A reflection type light emitting diode 230 which is a light source is further arranged at the (last stage), the case 240 is housed in the case 240, and then the case 240 is filled with a light transmissive material 250.

The first light emitting diode 210 is different from the light emitting diode 110 used in the first embodiment shown in FIG. 2 in that a light emitting element emitting blue light is used instead of the light emitting element 111 emitting red light. That is, the area ratio of the optical surface 114 and the reflection portion 114a formed on the optical surface 114 is set to 6: 5. It should be noted that, in the first light emitting diode 210, those having the same function as the light emitting diode 110 used in the first embodiment are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The second light emitting diode 220 is different from the light emitting diode 110 used in the first embodiment shown in FIG. 2 in that a light emitting element emitting green light is used instead of the light emitting element 111 emitting red light. . In the second light emitting diode 220, those having the same function as the light emitting diode 110 used in the first embodiment are designated by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The reflection type light emitting diode 230 which is a light source is different from the reflection type light emitting diode 120 which is a light source used in the first embodiment except that a light emitting element which emits red light is used instead of a light emitting element which emits green light. That is. The reflective light emitting diode 230 having the same function as that of the reflective light emitting diode 120 used in the first embodiment is denoted by the same or corresponding reference numeral, and detailed description thereof will be omitted.

The laminated light emitting diode 20 having the above structure
At 0, most (about 80%) of the blue light emitted from the light emitting element of the first light emitting diode 210 is
Of a large number of dots formed on the optical surface 114 of
The emission surface 1 of the first light emitting diode 210 after being reflected by
The light is emitted from 15 as parallel light. In addition, a part of the green light emitted by the light emitting element of the second light emitting diode 220 is
After being reflected by a plurality of dot-shaped reflecting portions 114a of the optical surface 114 of the second light emitting diode 220 and being emitted from the emitting surface 115 of the second light emitting diode 220, the reflecting portion of the optical surface 114 of the first light emitting diode 210. The light is incident on a portion where 114a is not formed and is emitted to the outside as parallel light from the emission surface 115 of the first light emitting diode 210. Further, a part of the red light emitted by the reflection type light emitting diode 230 is incident on a portion of the optical surface 114 of the second light emitting diode 220 where the reflection portion 114a is not formed and is emitted from the emission surface 115 of the second light emitting diode 220. After that, the light is incident on a portion of the optical surface 114 of the first light emitting diode 210 where the reflecting portion 114a is not formed, and the first light emitting diode 21
The light is emitted from the emission surface 115 of 0 as parallel light to the outside.

According to the second embodiment of the present invention, the blue light emitted by the light emitting element of the first light emitting diode 210, the green light emitted by the light emitting element of the second light emitting diode 220 and the reflective light emitting diode 230 which is the light source are emitted. Red light can be efficiently mixed and emitted to the outside, and the energization currents of the light emitting element of the first light emitting diode 210, the light emitting element of the second light emitting diode 220 and the light emitting element of the reflective light emitting diode 230 are controlled respectively. Can emit light of all colors. In rated lighting, at present, the light emitting element that emits blue light has a significantly smaller light emission output than the light emitting element that emits green light and the light emitting element that emits red light.
Further, a light emitting element that emits red light has a larger light emission output than a light emitting element that emits green light. The luminous intensity ratio of each color for white light is approximately blue: green: red = 1: 9: 3. According to the second embodiment of the present invention, the light emitted from the light emitting element 111 that emits the blue light with the smallest light emission output is efficiently emitted to the outside, and the balance of the other two colors is adjusted to the blue light output. It is possible to provide a light emitting diode lamp that emits white light having a front luminance (luminance value of 350 mcd) which is nearly 100 times higher than that of the conventional technique. Further, assuming that the outer diameters of the radiation surfaces are the same, the thickness can be made equal to that of the conventional technique even if the layers are stacked in three stages.

The present invention is not limited to the second embodiment, and various modifications can be made within the scope of the gist thereof. For example, in the second embodiment, the two light emitting diodes 210 and 220 are arranged in a laminated form and the reflection type light emitting diode 230 is arranged behind them as a light source, but the present invention is not limited to this, and three or more light emitting diodes are emitted. Alternatively, the diodes may be arranged in a stack and the light source may be arranged behind them. In this case, light having various light distribution characteristics can be emitted by combining light emitting diodes and light sources having the same wavelength or different wavelengths having different light distribution characteristics, for example, the light distribution characteristics can be changed stepwise. It becomes possible.

In the second embodiment, the case 240 is filled with the light transmissive material 250. However, the present invention is not limited to this. As in the case of the first embodiment, the first light emitting diode is used. 210 and the second light emitting diode 2
It is sufficient that only the optical paths between the second light emitting diode 220 and the reflective light emitting diode 230 are filled with the light transmissive material 250. In addition, for example, like the stacked light emitting diode 260 shown in FIG.
The second light emitting diode 220 and the reflective light emitting diode 23 are provided on the back side of the optical surface 114 of the first light emitting diode 210.
The incident surface 211 is provided so that the light emitted by 0 enters at a substantially right angle, the space between the optical surface 114 and the incident surface 211 of the first light emitting diode 210 is filled with the light transmissive material 113, and the second light emitting diode 220 is provided. An incident surface 221 is provided on the back surface side of the optical surface 114 of the second light emitting diode 220 so that the light emitted from the reflective light emitting diode 230 is incident at a substantially right angle. Material 113
When filled with, the case 240 is filled with the light-transmissive material 25.
It may not be filled with 0.

Next, FIG. 12 shows the third embodiment of the present invention.
It will be described with reference to FIGS. FIG. 12 is a schematic sectional view of a stacked light emitting diode that is a third embodiment of the present invention. FIG. 13 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG. FIG. 14 is a schematic rear view of the light emitting diode shown in FIG.

As shown in FIG. 12, the stacked type light emitting diode 300 according to the third embodiment of the present invention includes a reflection type light emitting diode 320 which is a light source behind the light emitting diode 310.
And place it in the case 330, and then the case 3
The inside of 30 is filled with the light transmissive material 340.

The light emitting diode 310 is shown in FIGS.
As shown in FIG. 4, a light emitting element 311 that emits red light and a lead frame 312 that supplies power to the light emitting element 311.
a, 312b, a light transmissive material 313, a concave optical surface 314, and a radiation surface 317. Light emitting element 311
Is arranged at the tip of the lead frame 312a and is electrically connected to the lead frame 312b by a wire 318. Light emitting element 311 and lead frame 312
The tip portions of a and 312b and the wire 318 are integrally sealed with a light transmissive material 313. Case 3
It is desirable that the light transmissive material 340 used to fill the inside of 30 has a refractive index equivalent to that of the light transmissive material 313. This is to prevent the light emitted from the reflective light emitting diode 320 from being refracted at the interface of the optical surface 314 to be emitted in an ineffective direction and from being reflected to reduce the transmittance. The emitting surface 317 is formed by the light emitting element 311.
Is formed flat on the back side of the.

The optical surface 314 is a circular central reflecting surface 314a arranged at a position facing the light emitting surface of the light emitting element 311.
And annular reflecting surfaces 314b, 314c, 314d in which steps are also provided between each
Have and. Central reflecting surface 314a and annular reflecting surface 314
Reference numerals b, 314c and 314d are formed in a concave shape, and the surface of the light transmissive material 313 is mirror-finished by plating or metal deposition.

The central reflecting surface 314a and the annular reflecting surface 314b.
Between the annular reflecting surface 314b and the annular reflecting surface 314c, and between the annular reflecting surface 314c and the annular reflecting surface 314d, a step 315a, a transmitting surface 316a, and a step 31 respectively.
5b and transparent surface 316b and step 315c and transparent surface 316
c is formed. Transmission surface 316a, 316b, 31
6c are all located on the same plane. Central reflective surface 314
The outer peripheral ends of the a and the annular reflecting surfaces 314b and 314c are located at the upper ends of the steps 315a, 315b and 315c, respectively. The inner peripheral ends of the annular reflecting surfaces 314b, 314c, 314d are located on the outer peripheral ends of the transmitting surfaces 316a, 316b, 316c, respectively. Transmission surface 316a, 316b, 316c
The inner peripheral edges of the steps are steps 315a, 315b, 315c, respectively.
Located at the bottom of the. The central reflecting surface 314a is the transmitting surface 31.
6a, 316b, 316c are located closer to the light emitting element 311 side, and when viewed from any position on the light emitting surface of the light emitting element 311, the central reflecting surface 314a and the annular reflecting surface 314 are located.
It is arranged at a position where there is no gap between it and b. Further, the annular reflecting surfaces 314b, 314c, 314d are the light emitting elements 3
It is arranged at a position where no gap is formed between the annular reflecting surface 314b and the annular reflecting surface 314c and between the annular reflecting surface 314c and the annular reflecting surface 314d when viewed from any position on the light emitting surface of No. 11.

The reflective light emitting diode 320, which is a light source, is different from the light emitting diode 310 in that a light emitting element that emits green light is used in place of the light emitting element 311 that emits red light, and that the light transmissive material 313 has a surface. Central reflective surface 31
4a, annular reflecting surfaces 314b, 314c, 314d, and transmitting surfaces 316a, 316b, 316c are formed in place of the optical surface 314 by mirror-finishing a convex surface of a light-transmissive material by plating or metal deposition. That is, the concave reflecting surface 321 is used. Incidentally, in the reflection type light emitting diode 320, those having the same function as the light emitting diode 310 are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The laminated light emitting diode 30 having the above structure
At 0, after the red light emitted from the light emitting element 311 of the light emitting diode 310 is reflected by the central reflecting surface 314a and the annular reflecting surfaces 314b, 314c, 314d of the optical surface 314,
A part of the green light that is emitted from the emission surface 317 as parallel light to the outside and is parallel light emitted by the reflection type light emitting diode 320 is incident on the transmission surfaces 316a, 316b, 316c of the optical surface 314 of the light emitting diode 310 and transmitted. After that, the light is emitted to the outside as parallel light from the emission surface 317.

According to the third embodiment of the present invention, the red light emitted by the light emitting element 311 of the light emitting diode 310 is emitted by the optical surface 3.
14 center reflective surface 314a and annular reflective surfaces 314b, 3
The green light emitted from the reflection type light emitting diode 320, which is reflected by 14 c and 314 d, is transmitted by the transmission surface 316 of the optical surface 314.
a, 316b, 316c are incident, transmitted, and emitted from the emission surface 317, respectively. The light emitted from the emitting surface 315 has a plurality of annular rings of red light and green light, but when the stacked light emitting diode 300 is viewed at a predetermined visual distance, it is visually recognized as one dot, and thus the light is emitted. The red light emitted by the light emitting element 311 of the diode 310 and the green light emitted by the reflective light emitting diode 320 can be efficiently mixed and radiated to the outside, and thus a high front luminance can be obtained.

Further, the concave optical surface 314 of the light emitting diode 310 is disposed between the central reflecting surface 314a arranged at a position facing the light emitting surface of the light emitting element 314 and each of the steps arranged around the central reflecting surface 314a. Also has annular reflecting surfaces 314b, 314c, 314d provided with steps, for example, by changing the respective curvatures to change the shapes of the central reflecting surface 314a and the annular reflecting surfaces 314b, 314c, 314d. The thickness of the light emitting diode can be reduced without changing the optical characteristics, and thus the laminated light emitting diode can be thinned.

Furthermore, when viewed from above the light emitting surface of the light emitting element 311, between the central reflecting surface 314a and the annular reflecting surface 314b, between the annular reflecting surface 314b and the annular reflecting surface 314c, and between the annular reflecting surface 314c and the annular reflecting surface. Since the central reflection surface 314a and the annular reflection surfaces 314b, 314c, and 314d are arranged at positions where no gap is formed between the surface 314d and the surface 314d, almost all luminous flux of red light emitted from the light emitting element 311 can be emitted forward.

In addition, the transmitting surfaces 316a, 316b, 31
6c is located on the same plane, and the central reflection surface 316a and the annular reflection surfaces 314b, 314c, 314d are located closer to the light emitting element 311 than the same plane.
The bottom surface of 14 has transmission surfaces 316a, 316b, 316c.
Only the reflective surface is formed. Therefore,
Even when the light emitting diode 310 is arranged so as to overlap with the reflective light emitting diode 320, since the lower surface portion of the optical surface 314 of the light emitting diode 310 contacts the emitting surface 317 of the reflective light emitting diode 320, the reflective surface is not damaged. Absent.

In addition, the light emitting element 3 of the light emitting diode 310
The light emitted from the stacked light emitting diode 300 can be continuously changed from red to green by controlling the energization currents of the light emitting elements of the reflection type light emitting diode 320.

Furthermore, by filling the space between the light emitting diode 310 and the reflective light emitting diode 320 with the light transmissive resin 340, the light emitted by the reflective light emitting diode 320 is reflected at the interfaces of the transmissive surfaces 316a, 316b, 316c. It can be transmitted without doing.

The present invention is not limited to the third embodiment, and various modifications can be made within the scope of the invention. For example, in the third embodiment, the case where the red light and the green light are mixed and emitted has been described. However, the present invention is not limited to this, and the green light and the blue light may be mixed and emitted.

Further, in the third embodiment, the annular reflecting surface is set to 31.
Although the three surfaces of 4b, 314c, and 314d have been described, the present invention is not limited to this. In addition, the central reflecting surface 314a and the annular reflecting surfaces 314b, 314c, 31
Although 4d has been described as having a concave shape, these may have a flat shape, or the central reflecting surface 314a may have a convex shape. In this case, the light emitting element 311
The light reflected by the convex central reflecting surface is reflected by one of the annular reflecting surfaces and then emitted from the emitting surface 317. Therefore, the light reflected by the central reflecting surface should be absorbed by the light emitting element 311. Instead, it can be radiated to the outside, and thus the reflection efficiency of the optical surface can be further improved. Further, the transmissive surfaces 316a, 316b, 316
Although c is arranged on the same plane, they may not be located on the same plane.

Further, in the third embodiment, the case in which the case 330 is filled with the light transmissive material 340 has been described, but the case is not limited to this, and the light emitting diode 31 is used.
It is sufficient if only the portion of the optical path between 0 and the reflective light emitting diode 320 is filled with the light transmissive material 340.
In addition, the transmissive surfaces 316a, 316b, 316c are arranged so that the light emitted from the reflective light emitting diode 320 is incident at a substantially right angle.
Is arranged substantially parallel to the radiation surface 327 of the reflection type light emitting diode, and the laminated type light emitting diode 300 considering the interface refraction of the light incident on the transmission surfaces 316a, 316b, 316c.
When designing the optical system, the case 330 may not be filled with the light transmissive material 340.

For example, the optical surface 3 of the light emitting diode 310 such as the laminated light emitting diode 350 shown in FIG.
An incident surface 351 is provided on the back side of the light emitting diode 320 so that the light emitted from the reflective light emitting diode 320 is incident at a substantially right angle, and a space between the optical surface 314 and the incident surface 351 of the light emitting diode 310 is filled with a light transmissive material 313. In this case, the light emitted from the reflective light emitting diode 320 can be incident on the incident surface 351 without being refracted and emitted in an ineffective direction, and can be transmitted through the optical surface 314 without interfacial refraction. At this time, regardless of the shape and surface roughness of the transmission surfaces 316a, 316b, 316c, the light is not refracted at the interface of the transmission surfaces and emitted in an ineffective direction. Therefore, it is possible to easily process the transmissive surface.

In the third embodiment, the reflection type light emitting diode 320 is used as the light source. However, the light source is not limited to this, and the lens type light emission is used as the light source like the laminated type light emitting diode 360 shown in FIG. Diode 3
70 may be used. Since the lens type light emitting diode 370 collects the light emitted by the light emitting element due to the difference in the refractive index at the lens interface and radiates it from the lens surface 371, the lens type light emitting diode 370 is placed inside the case 330a.
Do not fill with the same light-transmissive material as. Therefore, the transmissive surfaces 316a and 316 of the light emitting diode 310 are
b, 316c are arranged so that the light emitted from the lens type light emitting diode 370 is incident at a substantially right angle.
a, 316b, or 316c, the optical system of the stacked light emitting diode 360 is designed in consideration of the interface reflection of light, or the stacked light emitting diode 380 shown in FIG. 17 is similar to that shown in FIG. Light emitting diode 31
Lens type light emitting diode 3 on the back side of the optical surface 314 of 0.
Incident surface 351 so that the light emitted by 70 is incident at a substantially right angle.
It is desirable to fill the space between the optical surface 314 and the incident surface 351 of the light emitting diode 310 with the light transmissive material 313. Further, instead of the reflective light emitting diode 320, a cold cathode tube, an EL lamp or the like may be used as a light source.

Further, in the third embodiment, the light-emitting diode 310 is filled with the light transmissive material 313 between the radiation surface 317 and the optical surface 314, but the invention is not limited to this. A hollow between 317 and the optical surface 314 may be used.

Next, the fourth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. FIG. 18 is a schematic sectional view of a stacked light emitting diode according to a fourth embodiment of the present invention.

As shown in FIG. 18, the stacked light emitting diode 400 according to the fourth embodiment of the present invention has a second light emitting diode 420 arranged behind a first light emitting diode 410 and a second light emitting diode 420 arranged behind the second light emitting diode 420. A reflection type light emitting diode 430, which is a light source, is arranged in the case 440.
Then, the case 440 is filled with the light transmissive material 450. The reflective light emitting diode 410
Although the reflection type light emitting diode 420 and the reflection type light emitting diode 420 are shown to have the same shape for convenience, it is preferable that the reflection part and the transmission part are actually deviated from each other.

The first light emitting diode 410 is different from the light emitting diode 310 used in the third embodiment shown in FIG. 13 in that a light emitting element emitting blue light is used instead of the light emitting element 311 emitting red light. . It should be noted that, in the first light emitting diode 410, those having the same function as the light emitting diode 310 used in the third embodiment are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The second light emitting diode 420 differs from the light emitting diode 310 used in the third embodiment shown in FIG. 13 in that a light emitting element emitting green light is used instead of the light emitting element 311 emitting red light. . In the second light emitting diode 420, those having the same function as the light emitting diode 310 used in the first embodiment are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The reflection type light emitting diode 430 which is a light source is different from the reflection type light emitting diode 320 which is a light source used in the third embodiment in that a light emitting element which emits red light is used instead of a light emitting element which emits green light. That is. In addition, in the reflection type light emitting diode 430, those having the same function as the reflection type light emitting diode 320 used in the third embodiment are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The laminated light emitting diode 40 having the above structure
At 0, the blue light emitted by the light emitting element of the first light emitting diode 410 is the central reflecting surface 314a of the optical surface 314 of the first light emitting diode 410 and the annular reflecting surfaces 314b, 314.
c, 314d, and then the first light emitting diode 41
It is emitted as parallel light from the emission surface 317 of 0 to the outside.
In addition, a part of the green light emitted from the light emitting element of the second light emitting diode 420 is part of the optical surface 314 of the second light emitting diode 420.
Center reflective surface 314a and annular reflective surfaces 314b, 314
After being reflected by c and 314d and emitted from the emission surface 317 of the second light emitting diode 420, the first light emitting diode 41
0 optical surface 314 transmission surfaces 316a, 316b, 316
It is incident on c and is emitted to the outside as parallel light from the emission surface 317 of the first light emitting diode 410. Further, a part of the red light emitted by the reflection type light emitting diode 430 is partially transmitted through the transmission surfaces 316a and 316 of the optical surface 314 of the second light emitting diode 420.
b, 316c and emitted from the emission surface 317 of the second light emitting diode 420, the first light emitting diode 410
Transmission surfaces 316a, 316b, 316c of the optical surface 314 of
To the outside as parallel light from the emission surface 317 of the first light emitting diode 410.

According to the fourth embodiment of the present invention, the blue light emitted by the light emitting element of the first light emitting diode 410, the green light emitted by the light emitting element of the second light emitting diode 420, and the reflective light emitting diode 430 as the light source are emitted. The red light can be efficiently mixed and emitted to the outside, and the energization currents of the light emitting element of the first light emitting diode 410, the light emitting element of the second light emitting diode 420 and the light emitting element of the reflective light emitting diode 430 can be controlled respectively. Can emit light of all colors.

The present invention is not limited to the fourth embodiment, and various modifications can be made within the scope of the gist thereof. For example, in the fourth embodiment, the two light emitting diodes 410 and 420 are arranged in a laminated shape and the reflection type light emitting diode 430 is arranged behind them as a light source. However, the present invention is not limited to this, and three or more light emitting diodes are laminated. The light source may be arranged in a rectangular shape and a light source may be arranged behind it. In this case, light having various light distribution characteristics can be emitted by combining light emitting diodes and light sources having the same wavelength or different wavelengths having different light distribution characteristics, for example, the light distribution characteristics can be changed stepwise. It becomes possible. It should be noted that a light emitting diode having a central reflecting surface, an annular reflecting surface, and an optical surface on which a transmitting surface is formed as shown in the third and fourth embodiments, and a dot-like reflection on the transmitting surface as shown in the first and second embodiments. It may be arranged in combination with a light emitting diode having an optical surface on which a portion is formed.

Further, in the fourth embodiment, the case in which the case 440 is filled with the light transmissive material 450 has been described, but the present invention is not limited to this, and the first light emitting diode is used as in the case of the third embodiment. 410 and the second light emitting diode 4
20 and between the second light emitting diode 420 and the reflection type light emitting diode 430, only the light path portions may be filled with the light transmissive material 450. In addition, for example, like the stacked light emitting diode 460 shown in FIG.
The second light emitting diode 420 and the reflective light emitting diode 43 are provided on the back side of the optical surface 314 of the first light emitting diode 410.
An incident surface 411 is provided so that the light emitted by 0 enters at a substantially right angle, a space between the optical surface 314 of the first light emitting diode 410 and the incident surface 411 is filled with a light transmissive material 313, and the second light emitting diode 420 is provided. The incident surface 421 is provided on the back surface side of the optical surface 314 of the second light emitting diode 420 so that the light emitted from the reflection type light emitting diode 430 is incident at a substantially right angle. Material 313
When filled with, the case 440 is filled with the light-transmissive material 45.
It may not be filled with 0.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
It will be described with reference to FIGS. FIG. 20 is a schematic cross-sectional view of a stacked light emitting diode that is a fifth embodiment of the present invention. 21 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG. 22 is a schematic rear view of the light emitting diode shown in FIG.

As shown in FIG. 20, the stacked type light emitting diode 500 according to the fifth embodiment of the present invention includes a reflection type light emitting diode 520 which is a light source behind the light emitting diode 510.
And place it in the case 530,
The inside of 30 is filled with a light transmissive material 540.

The light emitting diode 510 is shown in FIGS.
2, a light emitting element 511 that emits blue light and a lead frame 512 that supplies power to the light emitting element 511.
a, 512b, the light transmissive material 513, and the light emitting element 51.
Optical surface 514 formed in the shape of a paraboloid of revolution with 1 as the focal point
And a radiation surface 515. The light emitting element 511 is arranged at the tip of the lead frame 512 a, and the wire 516 is provided.
Is electrically connected to the lead frame 512b. The light emitting element 511 and the lead frames 512a, 51
2b and the wire 516 are made of a light-transmissive material 513.
Are integrally sealed by. A low melting point glass is used for the light transmissive material 513. This is for improving the weather resistance of the light emitting diode 510 and for facilitating the dichroic mirror of the optical surface 514. still,
Light-transmissive material 54 used to fill the case 530
It is desirable that 0 has a refractive index equivalent to that of the light transmissive material 513. This is to prevent the light emitted from the reflective light emitting diode 520 from being refracted at the interface of the optical surface 514 to be emitted in an ineffective direction and from being reflected to reduce the transmittance. The optical surface 514 is a dichroic mirror formed by laminating thin films having different refractive indices on the convex surface of the light transmissive material 513, and reflects only light in the blue wavelength range and transmits light in other wavelength ranges. It is a thing. The optical surface 514 is arranged on the side facing the light emitting surface of the light emitting element 511. Various materials are currently used as the material of the multilayer thin film forming the dichroic mirror, but typical ones are TiO ₂ and SiO _2.
There is. The radiation surface 515 is formed in a flat shape on the back surface side of the light emitting element 511.

The reflection type light emitting diode 520 which is a light source is different from the light emitting diode 510 in that a light emitting element which emits green light is used instead of the light emitting element 511 which emits blue light, and a convex surface of the light transmissive material 513 is used. Instead of the optical surface 514 on which the dichroic mirror is formed, a concave reflecting surface 521 formed by mirror-finishing the convex surface of the light transmissive material by plating or metal deposition is used.
Incidentally, in the reflection type light emitting diode 520, those having the same function as the light emitting diode 510 are given the same or corresponding reference numerals, and detailed description thereof will be omitted.

The laminated light emitting diode 50 having the above structure.
At 0, almost all the luminous flux of blue light emitted from the light emitting element 511 of the light emitting diode 510 is reflected by the optical surface 514 having the dichroic mirror, and then emitted as parallel light from the emitting surface 515 to the outside. Light emitting diode 5
The substantially total luminous flux of the green light, which is the parallel light emitted by the light beam 20, is incident on the optical surface 514 of the light emitting diode 510 on which the dichroic mirror is formed, passes through the light surface, and then is emitted from the emitting surface 515 as parallel light to the outside.

According to the fifth embodiment of the present invention, almost all the luminous flux of blue light emitted from the light emitting element 511 of the light emitting diode 510 is reflected by the optical surface 514 having the dichroic mirror, and the reflection type light emitting diode 520 is used. Since almost all luminous fluxes of the emitted green light are made incident on the optical surface 514 having the dichroic mirror formed, transmitted and emitted from the respective emission surfaces 515, the light emitting element 511 of the light emitting diode 510.
The blue light emitted by and the green light emitted by the reflection type light emitting diode 520 can be efficiently mixed and radiated to the outside, and thus a high front luminance can be obtained.

In addition, the light emitting element 5 of the light emitting diode 510
The light emitted from the stacked light emitting diode 500 can be continuously changed from blue to green by controlling the currents flowing through the light emitting elements of the reflective light emitting diode 520 and the reflective light emitting diode 520.

Further, by filling the space between the light emitting diode 510 and the reflection type light emitting diode 520 with the light transmissive resin 540, the light emitted by the reflection type light emitting diode 520 is not reflected at the interface of the secondary surface 514. Can be transmitted.

The present invention is not limited to the fifth embodiment, but various modifications can be made within the scope of the invention. For example, in the fifth embodiment, the case where the blue light and the green light are mixed and emitted has been described, but the present invention is not limited to this, and the optical surface 514 of the light emitting diode 510 reflects only the light in the red wavelength range, and the other light. By transmitting light in the wavelength range, the red light and the green light may be mixed and emitted.

Further, in the fifth embodiment, the optical surface 514 has been described as the one in which the dichroic mirror is formed on the convex surface of the light transmitting material 513, but the present invention is not limited to this, and it is possible to specify by using a hologram or the like. It may be one that reflects only light in the wavelength range and transmits light in other wavelength ranges. Further, the optical surface 514 is not limited to the one having a paraboloid of revolution.

Further, in the fifth embodiment, the case in which the case 530 is filled with the light transmitting material 540 has been described, but the present invention is not limited to this, and the light emitting diode 51 is used.
It is sufficient if only the portion of the optical path between 0 and the reflective light emitting diode 520 is filled with the light transmissive material 540.
In addition, the light emitting diode 510 and the reflective light emitting diode 5
20 and an optical system such as a lens to adjust the incident angle of light incident on the optical surface 514, and the interface refraction of the light incident on the optical surface 514 is taken into consideration.
When designing an optical system of 0, the case 530 may not be filled with the light transmissive material 540.

For example, as in the stacked light emitting diode 550 shown in FIG. 23, the optical surface 5 of the light emitting diode 510 is
An incident surface 551 is provided on the back surface side of the light emitting diode 520 so that the light emitted from the reflective light emitting diode 520 is incident at a substantially right angle, and a space between the optical surface 514 and the incident surface 551 of the light emitting diode 510 is equivalent to the light transmissive material 513. When filled with a light transmissive material 552 having a refractive index of
The light emitted by 0 can be made incident on the incident surface 551 without being reflected at the interface and transmitted through the optical surface 514. still,
Glass is used as the light transmissive material 552.
The light emitting diode 510 may be molded by using a resin for the light transmissive material 513 by forming a dichroic mirror on the concave surface of 2.

In the fifth embodiment, the reflection type light emitting diode 520 is used as the light source. However, the light source is not limited to this, and the lens type light emission is used as the light source like the laminated type light emitting diode 560 shown in FIG. Diode 5
70 may be used. The lens type light emitting diode 570 collects the light emitted from the light emitting element due to the difference in the refractive index at the lens interface and radiates the light from the lens surface 571.
It should not be filled with a light transmissive material of the same refractive index as. Therefore, it is desirable to design the optical system of the stacked light emitting diode 560 in consideration of the interface reflection of the light incident on the optical surface 514, such as the structure similar to that of the stacked light emitting diode shown in FIG. In addition, the reflective light emitting diode 52
Instead of 0, a cold cathode tube, an EL lamp or the like may be used as a light source.

Further, in the fifth embodiment, the light-emitting diode 510 having the space between the radiation surface 515 and the optical surface 514 filled with the light-transmissive material 513 has been described, but the invention is not limited to this. It may be hollow between the surface 514.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. FIG. 25 is a schematic sectional view of a stacked light emitting diode according to a sixth embodiment of the present invention.

As shown in FIG. 25, the stacked light emitting diode 600 according to the sixth embodiment of the present invention has a second light emitting diode 620 disposed behind a first light emitting diode 610 and a second light emitting diode 620 disposed behind the second light emitting diode 620. A reflection type light emitting diode 630, which is a light source, is arranged in the case 640.
Then, the case 640 is filled with the light-transmissive material 650.

The first light emitting diode 610 is the same as the light emitting diode 510 used in the fifth embodiment shown in FIG. It should be noted that, in the first light emitting diode 610, those having the same functions as those of the light emitting diode 510 used in the fifth embodiment are denoted by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The second light emitting diode 620 differs from the light emitting diode 510 used in the fifth embodiment shown in FIG. 21 in that a light emitting element emitting green light is used instead of the light emitting element 511 emitting blue light. In place of the optical surface 514 on which the dichroic mirror that reflects only the light of the wavelength range of and transmits the light of the other wavelength range is formed, a dichroic mirror that reflects only the light of the green wavelength range and transmits the light of the other wavelength range is provided. That is, the optical surface 624 is formed. In the second light emitting diode 620, those having the same function as the light emitting diode 510 used in the fifth embodiment are designated by the same or corresponding symbols, and detailed description thereof will be omitted.

The reflection type light emitting diode 630 as a light source is different from the reflection type light emitting diode 520 as a light source used in the fifth embodiment in that a light emitting element emitting red light is used instead of a light emitting element emitting green light. That is. Incidentally, in the reflection type light emitting diode 630, those having the same function as the reflection type light emitting diode 520 used in the fifth embodiment are designated by the same or corresponding reference numerals, and detailed description thereof will be omitted.

The laminated light emitting diode 60 having the above structure.
At 0, almost all the luminous flux of blue light emitted from the light emitting element of the first light emitting diode 610 is reflected by the optical surface 514 of the first light emitting diode 610 on which the dichroic mirror is formed, and then emitted as parallel light from the emitting surface 515. It is emitted to the outside. In addition, almost all luminous flux of green light emitted from the light emitting element of the second light emitting diode 620 is reflected by the optical surface 624 of the second light emitting diode 620 on which the dichroic mirror is formed, and is emitted from the emitting surface 515 of the second light emitting diode 620. After that, the light is incident on the optical surface 514 of the first light emitting diode 610 on which the dichroic mirror is formed, and emitted from the emission surface 515 of the first light emitting diode 610 as parallel light to the outside. Further, substantially the entire luminous flux of red light emitted from the reflective light emitting diode 630 enters the optical surface 624 of the second light emitting diode 620 on which the dichroic mirror is formed, and is emitted from the emitting surface 515 of the second light emitting diode 620,
The light is incident on the optical surface 514 of the first light emitting diode 610 on which the dichroic mirror is formed, and the first light emitting diode 61
The light is emitted from the emission surface 515 of 0 as parallel light to the outside.

According to the sixth embodiment of the present invention, the luminous flux of the blue light emitted from the light emitting element of the first light emitting diode 610 and the luminous flux of the green light emitted from the light emitting element of the second light emitting diode 620 and the light source are A light emitting element of the first light emitting diode 610, which can efficiently mix the red light emitted from a certain reflection type light emitting diode 630 with almost the whole luminous flux and radiate it to the outside,
It is possible to emit light of all colors by controlling the currents flowing through the light emitting element of the second light emitting diode 620 and the light emitting element of the reflective light emitting diode 630.

The present invention is not limited to the sixth embodiment, and various modifications can be made within the scope of the gist thereof. For example, in the sixth embodiment, two light emitting diodes 610 and 620 are arranged in a stack and the reflection type light emitting diode 630 is arranged behind them as a light source, but the present invention is not limited to this, and three or more light emitting diodes are stacked. The light source may be arranged in a rectangular shape and a light source may be arranged behind it. The light emitting diode having the optical surface on which the dichroic mirror shown in the fifth and sixth embodiments is formed, and the optical surface on which the central reflecting surface, the annular reflecting surface and the transmitting surface shown in the third and fourth embodiments are formed. Or a combination of a light emitting diode having a light emitting diode having an optical surface in which a reflecting portion is formed in a dot shape on the transmitting surface shown in the first and second embodiments, or the fifth and sixth embodiments. A light emitting diode having an optical surface on which the dichroic mirror shown in,
A light emitting diode having an optical surface on which a central reflecting surface, an annular reflecting surface and a transmitting surface shown in the third and fourth embodiments are formed,
It may be arranged in combination with a light emitting diode having an optical surface in which a reflecting portion is formed in a dot shape on the transmitting surface shown in the first and second embodiments.

In the sixth embodiment, the case 640 is filled with the light transmissive material 650, but the present invention is not limited to this, and the first light emitting diode can be used as in the case of the fifth embodiment. 610 and the second light emitting diode 6
20 and between the second light emitting diode 620 and the reflection type light emitting diode 630, only the light path portions may be filled with the light transmissive material 650. In addition, for example, like a stacked light emitting diode 660 shown in FIG.
The second light emitting diode 620 and the reflective light emitting diode 63 are provided on the back side of the optical surface 514 of the first light emitting diode 610.
An incident surface 611 is provided so that the light emitted by 0 enters at a substantially right angle, and a light transmissive material having a refractive index equivalent to that of the light transmissive material 513 is provided between the optical surface 514 of the first light emitting diode 610 and the incident surface 611. An incident surface 621 is provided on the back side of the optical surface 624 of the second light emitting diode 620 so that the light emitted from the reflective light emitting diode 630 is incident at a substantially right angle. 624
Similarly, when the space between the light incident surface 621 and the light incident surface 621 is filled with the light transmitting material 552, the case 640 may not be filled with the light transmitting material 650.

[0135]

As described above, according to the first aspect of the invention, a part of the light emitted from the light emitting element is reflected by the optical surface to be emitted to the outside, and the light incident from the back of the optical surface is also emitted. Since a part of the light is transmitted and radiated to the outside, the light emitted from the light emitting element and the light incident from behind the optical surface can be efficiently mixed and radiated to the outside, and thus a high front luminance can be obtained. It is possible to provide a light emitting diode capable of performing the above.

According to the second aspect of the present invention, a part of the light emitted from the light emitting element is reflected by the partially formed reflecting portion of the optical surface to be emitted to the outside and at the back of the optical surface. Since a part of the light incident from is transmitted through the transmission surface of the optical surface and emitted to the outside, it is possible to provide a light emitting diode having the same effect as that of the invention according to claim 1.

According to the third aspect of the present invention, a part of the light emitted by the light emitting element is reflected by a plurality of reflecting portions formed in a dot shape on the optical surface and emitted to the outside, and at the same time, the optical surface Since a part of the light incident from behind is transmitted through the transmission surface of the optical surface and emitted to the outside, it is possible to provide a light emitting diode having the same effect as that of the invention according to claim 1.

According to the fourth aspect of the present invention, a part of the light emitted from the light emitting element is reflected by the reflection portion formed in the mesh shape of the optical surface to be radiated to the outside and at the back of the optical surface. Since a part of the light incident from is transmitted through the transmission surface of the optical surface and emitted to the outside, it is possible to provide a light emitting diode having the same effect as that of the invention according to claim 1.

According to the fifth aspect of the present invention, a part of the light emitted by the light emitting element is reflected by the reflecting portion of the optical surface formed in a radial pattern and emitted to the outside, and from the back of the optical surface. Since a part of the incident light is transmitted through the transmission surface of the optical surface and emitted to the outside, it is possible to provide a light emitting diode having the same effect as that of the invention according to claim 1.

According to the sixth aspect of the present invention, a part of the light emitted from the light emitting element is reflected by the half mirror forming the optical surface to be emitted to the outside, and the light incident from behind the optical surface. Since a part of the light is transmitted through the half mirror forming the optical surface and is radiated to the outside, it is possible to provide a light emitting diode having the same effect as that of the invention according to claim 1.

According to the invention described in Item 7, by virtue of the above configuration, it is possible to provide a light emitting diode having the same effect as the invention described in Item 1.

The light emitting diode according to the invention of claim 8 is
Provided on the back side of the optical surface is an incident surface for entering light emitted from behind the optical surface, and by filling a light transmissive material between the incident surface and the optical surface, It is possible to provide a light emitting diode capable of preventing the light incident from the back from being refracted at the interface of the optical surface to be emitted in an ineffective direction and from being reflected to reduce the transmittance.

According to the ninth aspect of the present invention, the light emitted from the light emitting element is reflected by the optical surface and emitted to the outside, and at the same time, a part of the light incident from the back of the optical surface is transmitted and emitted to the outside. Therefore, the light emitted from the light emitting element and the light incident from behind the optical surface can be efficiently mixed and radiated to the outside, and thus a light emitting diode capable of obtaining high front luminance can be provided. .

According to the tenth aspect of the invention, a central reflecting surface is provided at a position where the light emitted from the light emitting element faces the light emitting surface of the light emitting element, and a step is provided around the central reflecting surface. Are reflected by a plurality of annular reflecting surfaces each provided with a step between them, and a part of the light incident from behind the optical surface is reflected on the central reflecting surface and the annular reflecting surface adjacent to the central reflecting surface. Since the light is transmitted by the plurality of transmitting surfaces provided between the surface and the adjacent ones of the annular reflecting surfaces, a light emitting diode having the same effect as that of the invention according to claim 9 can be provided. .

According to the eleventh aspect of the present invention, the central reflecting surface and the plurality of annular reflecting surfaces are the central reflecting surface and the annular reflecting surface adjacent to the central reflecting surface when viewed from above the light emitting surface of the light emitting element. A light emitting diode capable of radiating substantially all luminous fluxes of light emitted by the light emitting element to the front, since the light emitting diode is arranged so that no gap is formed between the adjacent ones of the annular reflecting surfaces and the adjacent ones. You can

According to the twelfth aspect of the invention, the plurality of transmitting surfaces are all located on the same plane, and the central reflecting surface and the plurality of annular reflecting surfaces are located closer to the light emitting element than the same plane. Therefore, only the transmissive surface is formed on the bottom surface of the optical surface, and the reflective surface is not formed. Therefore, since the lower surface portion of the optical surface is in contact with each other even when the light emitting diodes are arranged in a stack, it is possible to provide a light emitting diode in which the reflecting portion is not damaged.

According to the thirteenth aspect of the present invention, by providing the central reflecting surface and the plurality of annular reflecting surfaces to be concave, a light emitting diode having the same effect as that of the ninth aspect can be provided. it can.

According to the fourteenth aspect of the present invention, by making the central reflecting surface convex and the plurality of annular reflecting surfaces concave, the light emitted from the light emitting element and reflected by the central reflecting surface is generated. Provided is a light emitting diode capable of emitting the light reflected by the central reflecting surface to the outside without being absorbed by the light emitting element, since the light is reflected by any of the plurality of annular reflecting surfaces and then emitted to the outside. can do.

According to the fifteenth aspect of the invention, with the above structure, it is possible to provide a light emitting diode having the same effect as the invention of the ninth aspect.

According to the sixteenth aspect of the invention, an incident surface on which the light emitted from the back of the optical surface is incident is provided on the back side of the optical surface, and the light is interposed between the incident surface and the optical surface. By filling the transparent material, it is possible to prevent the light incident from the back of the optical surface from being refracted at the interface of the optical surface to be emitted in an ineffective direction and from being reflected to reduce the transmittance. It is possible to provide a light emitting diode that can be manufactured.

According to the seventeenth aspect of the present invention, the light having the wavelength emitted by the light emitting element is reflected by the optical surface to be emitted to the outside, and the wavelength different from the light emitted by the light emitting element incident from behind the optical surface. The light emitted from the light emitting element and the light incident from the back of the optical surface can be efficiently mixed and emitted to the outside, and thus a high front luminance can be obtained. It is possible to provide a light emitting diode that can be used.

According to the eighteenth aspect of the present invention, the optical surface is a concave dichroic mirror formed by laminating thin films having different refractive indexes.
It is possible to provide a light emitting diode having the same effect as the described invention.

According to the nineteenth aspect of the invention, with the above structure, it is possible to provide a light emitting diode having the same effect as that of the seventeenth aspect of the invention.

According to the twentieth aspect of the invention, an incident surface on which the light emitted from the back of the optical surface is incident is provided on the back side of the optical surface, and the light is interposed between the incident surface and the optical surface. By filling the transparent material, it is possible to prevent the light incident from the back of the optical surface from being refracted at the interface of the optical surface to be emitted in an ineffective direction and from being reflected to reduce the transmittance. It is possible to provide a light emitting diode that can be manufactured.

According to the twenty-first aspect of the invention, with the above structure, it is possible to efficiently mix several types of light and radiate the light to the outside, and thus obtain a high front luminance. A diode can be provided.

According to the twenty-second aspect of the present invention, since the at least one light emitting diode and the light source emit light in different wavelength ranges, a laminated light emitting diode capable of emitting light of various colors is provided. be able to.

According to the twenty-third aspect of the present invention, since the at least one light emitting diode and the light source emit light having different light distribution characteristics, a laminated light emitting device capable of emitting light having various light distribution characteristics. A diode can be provided.

According to the twenty-fourth aspect of the present invention, because of the above-mentioned structure, the laminated type light emission capable of emitting light of all colors by varying the light amounts of blue light, green light and red light, respectively. A diode can be provided.

According to the twenty-fifth aspect of the invention, when there are a plurality of the light emitting diodes, a light transmissive material is used between the light emitting diodes in the adjacent stages and between the light emitting diode and the light source adjacent thereto. By filling, it is possible to prevent the light incident from the back of the optical surface from being refracted at the interface of the optical surface to be emitted in an ineffective direction and from being reflected to reduce the transmittance. A stacked light emitting diode can be provided.

According to the twenty-sixth aspect of the present invention, when there are a plurality of the light emitting diodes, the light path between the light emitting diodes in the adjacent stages and the light path between the light emitting diode and the light source adjacent to the light emitting diode are lighted. By filling with a transparent material, it is possible to provide a laminated light emitting diode having the same effect as that of the invention of claim 25.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a stacked light emitting diode that is a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG.

FIG. 3 is a schematic rear view of the light emitting diode shown in FIG.

FIG. 4 is a schematic rear view of a modification of the light emitting diode used in the stacked light emitting diode shown in FIG.

5 is a schematic rear view of a modification of the light emitting diode used in the stacked light emitting diode shown in FIG.

FIG. 6 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the first embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of a stacked light emitting diode that is a modified example of the first embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the first embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the first embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of a stacked light emitting diode that is a second embodiment of the present invention.

FIG. 11 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the second embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view of a stacked light emitting diode that is a third embodiment of the present invention.

13 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG.

14 is a schematic rear view of the light emitting diode shown in FIG.

FIG. 15 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the third embodiment of the present invention.

FIG. 16 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the third embodiment of the present invention.

FIG. 17 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the third embodiment of the present invention.

FIG. 18 is a schematic cross-sectional view of a stacked light emitting diode that is a fourth embodiment of the present invention.

FIG. 19 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the fourth embodiment of the present invention.

FIG. 20 is a schematic cross-sectional view of a stacked light emitting diode that is a fifth embodiment of the present invention.

21 is a schematic cross-sectional view of a light emitting diode used in the stacked light emitting diode shown in FIG.

22 is a schematic rear view of the light emitting diode shown in FIG. 21. FIG.

FIG. 23 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the fifth embodiment of the present invention.

FIG. 24 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the fifth embodiment of the present invention.

FIG. 25 is a schematic sectional view of a stacked light emitting diode according to a sixth embodiment of the present invention.

FIG. 26 is a schematic cross-sectional view of a stacked light emitting diode that is a modification of the sixth embodiment of the present invention.

FIG. 27 is a schematic cross-sectional view of a conventional light emitting diode.

[Explanation of symbols]

100, 150, 160, 180, 190, 200, 2
60,300,350,360,380,400,46
0,500,550,560,600,660 laminated light emitting diode 110,170,310,510 light emitting diode 210,410,610 first light emitting diode 220,420,620 second light emitting diode 120,230,320,430, 520,630
Reflection type light emitting diode 191,370,570 Lens type light emitting diode 130,130a, 240,330,330a, 44
0,530,530a, 640 case 111,311,511 light emitting element 112a, 112b, 312a, 312b, 512a,
512b Lead frame 113,140,250,313,340,450,5
13,540,552,650 Light transmissive material 114,171,172,314,514,624
Optical surface 114a, 114b, 114c Reflecting part 115, 317, 515 Radiating surface 116, 318, 516 Wire 121, 321, 521 Concave reflecting surface 151, 181, 211, 221, 351, 411, 4
21,551,611,621 Incident surface 192,371,571 Lens surface 314a Central reflection surface 314b, 314c, 314d Annular reflection surface 315a, 315b, 315c Step difference 316a, 316b, 316c Transmission surface

Claims (26)

[Claims] 1. A light emitting element, and an optical surface arranged at a position facing a light emitting surface of the light emitting element, wherein the optical surface reflects part of light emitted by the light emitting element and radiates the light to the outside. In addition, the light emitting diode is characterized by transmitting a part of the light incident from the back of the optical surface and radiating the light to the outside. 2. The light emitting diode according to claim 1, wherein the optical surface is a concave transmissive surface on which a reflective portion is partially formed. 3. The light emitting diode according to claim 2, wherein the optical surface is a concave transmissive surface on which a plurality of reflecting portions are formed in a dot shape. 4. The light emitting diode according to claim 2, wherein the optical surface is a concave transmissive surface on which reflective portions are formed in a mesh shape. 5. The light emitting diode according to claim 2, wherein the optical surface is a concave transmissive surface on which reflective portions are radially formed. 6. The light emitting diode according to claim 1, wherein the optical surface is a concave half mirror formed by a semitransparent thin film reflecting surface. 7. A light emitting element is provided on the back side of the light emitting element for emitting the light reflected by the optical surface and the light transmitted through the optical surface to the outside, and a light is provided between the emission surface and the optical surface. A permeable material is filled, and the permeable material is filled.
The light emitting diode according to 4, 5, or 6. 8. A rear surface of the optical surface has an incident surface on which light emitted from the back of the optical surface is incident, and a light transmissive material is filled between the incident surface and the optical surface. The light emitting diode according to claim 7. 9. A light emitting element, and an optical surface arranged at a position facing a light emitting surface of the light emitting element, wherein the optical surface reflects the light emitted by the light emitting element and radiates the light to the outside. A light emitting diode, wherein a part of light incident from behind the optical surface is transmitted and radiated to the outside. 10. The optical surface has a step between a central reflecting surface arranged at a position facing the light emitting surface of the light emitting element and a step provided around the central reflecting surface. A plurality of annular reflecting surfaces provided, and a plurality of transmitting surfaces provided between the central reflecting surface and the annular reflecting surface adjacent to the central reflecting surface and between adjacent ones of the annular reflecting surfaces. The light emitting diode according to claim 9, wherein the light emitting diode is formed in a substantially concave shape as a whole. 11. The central reflection surface and the plurality of annular reflection surfaces are between the central reflection surface and the adjacent annular reflection surface when viewed from the light emitting surface of the light emitting element, and the annular reflection surface. 11. The light emitting diode according to claim 10, wherein the light emitting diodes are arranged so that no gap is formed between adjacent ones. 12. The plurality of transmitting surfaces are all located on the same plane, and the central reflecting surface and the plurality of annular reflecting surfaces are located closer to the light emitting element than the same plane. 10. The light emitting diode according to 10 or 11. 13. The light emitting diode according to claim 10, 11 or 12, wherein the central reflecting surface and the plurality of annular reflecting surfaces are concave. 14. The central reflecting surface has a convex shape, and the plurality of annular reflecting surfaces has a concave shape.
2. The light emitting diode according to 2. 15. A light emitting surface is provided on the back surface side of the light emitting element for radiating the light reflected by the optical surface and the light transmitted through the optical surface to the outside, and the light is provided between the light emitting surface and the optical surface. 11. A permeable material is filled in, 9.
The light emitting diode according to 11, 12, 13 or 14. 16. A rear surface of the optical surface has an incident surface on which light emitted from the back of the optical surface is incident, and a light transmissive material is filled between the incident surface and the optical surface. 16. The light emitting diode according to claim 15, wherein. 17. A light emitting element, and an optical surface arranged at a position facing a light emitting surface of the light emitting element, wherein the optical surface reflects light having a wavelength emitted by the light emitting element and emits the light to the outside. At the same time, the light-emitting diode is characterized in that light having a wavelength different from that of the light emitted from the light-emitting element which is incident from behind the optical surface is transmitted and emitted to the outside. 18. The light emitting diode according to claim 17, wherein the optical surface is a concave dichroic mirror formed by laminating thin films having different refractive indexes. 19. A light emitting element is provided on the rear surface side of the light emitting element for emitting light reflected by the optical surface and light transmitted through the optical surface to the outside, and a light emitting element is provided between the light emitting surface and the optical surface. 18. A permeable material is filled, and the permeable material is filled.
8. The light emitting diode according to 8. 20. A rear surface of the optical surface has an incident surface on which light emitted from the back of the optical surface is incident, and a light transmissive material is filled between the incident surface and the optical surface. The light emitting diode according to claim 19, wherein: 21. Claims 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15, 16,
At least one of the light-emitting diodes described in 17, 18, 19 or 20 and a light source, so that the light-emitting diode or the light source in the rear stage is located behind the optical surface of the light-emitting diode in the front stage, and the light source is in the last stage. A laminated light emitting diode, wherein the laminated light emitting diodes are arranged in a laminated shape. 22. The stacked light emitting diode according to claim 21, wherein the at least one light emitting diode and the light source emit light in different wavelength ranges. 23. The stacked light emitting diode according to claim 21, wherein the at least one light emitting diode and the light source emit light having different light distribution characteristics. 24. The light emitting diode which emits green light is arranged behind the optical surface of the light emitting diode which emits blue light, and the light source which emits red light is arranged behind the optical surface of the light emitting diode which emits green light. Claim 2 which is a thing
1. The laminated light emitting diode according to 1. 25. When a plurality of the light emitting diodes are provided, a space between the light emitting diodes in adjacent stages and a space between the light emitting diodes and the light source adjacent thereto are filled with a light transmissive material. Item 21, 22, 23 or 2
4. The laminated light emitting diode according to item 4. 26. When a plurality of the light emitting diodes are provided, an optical path between the light emitting diodes in adjacent stages and an optical path between the light emitting diode and the light source adjacent to the light emitting diode are filled with a light transmissive material. Claims 21, 2
2. The laminated light emitting diode according to 2, 23 or 24.