JP2003110149A - Light-emitting unit and illuminator using the light- emitting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminator which is provided with several light sources having different colors and exhibits high color-mixture capability. SOLUTION: The illuminator 2 has several light-emitting diodes 201-203 which are mounted on a substrate 23. It is provided with a color-mixture layer formed of a transparent resin in the form of a column whose bottom is the circular region of the substrate 23 including the light-emitting diodes 201-203, a light distribution layer formed of a transparent resin whose lower bottom is the upper bottom of the color-mixture layer and which has an upper bottom larger than its lower bottom and a light reflector 22 which supports them. The interface between the color mixture layer and the resin layer and the interface between the light distribution layer and the resin layer are mirror surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting unit having a plurality of light sources having different emission colors and an illuminating device using the light emitting unit, and more particularly to a technique for mixing lights from the plurality of light sources.

[0002]

2. Description of the Related Art In recent years, as a lighting device for the next generation, research and development of a lighting device using a light emitting diode has been actively pursued. Research has been conducted to improve the emission color of such an illuminating device. For example, Japanese Patent Laid-Open No. 11-16
Japanese Patent No. 3418 discloses a light source capable of mixing light emitted from light emitting diodes of a plurality of colors.

That is, according to the light source, light emitting diodes of a plurality of colors can be arranged close to each other, and further, the light emitted by these light emitting diodes can be diffused by a diffusion plate or the like to improve color mixing. It is a thing.

[0004]

However, the light emitted from the light emitting diode has a high brightness, and the colors are not mixed well only by arranging them in close proximity, and there is a limit to close placement in the first place due to mounting restrictions. Further, even if a diffuser plate or the like is used, the directivity is only slightly eased, and the reality is that a sufficient color mixing effect cannot be obtained.

Further, as a practical problem, it is important to increase the light emitting area of the illuminating device in order to improve the color mixing property. This is because even if the color mixing property is high, a lighting device having a small light emitting area such as a point light source having high brightness cannot be used practically. The present invention has been made in view of the above problems, and provides a lighting device including a plurality of light sources having different emission colors, which has a high color mixing property without narrowing a light emitting area. The purpose is to do.

[0006]

In order to achieve the above object, a light emitting unit according to the present invention is a light emitting unit in which a plurality of light emitting bodies having different emission colors are mounted on a substrate. A cylindrical body having a lower bottom surface in a region including the light-emitting body, a color mixing portion whose inner peripheral surface is a reflecting surface, and an upper bottom surface of the color mixing portion is a lower bottom surface, which has an area larger than that of the lower bottom surface. A truncated cone having a large upper bottom surface, the inner peripheral surface of which is a reflecting surface, and a light distribution portion whose inside is filled with a translucent material.

By doing so, it is possible to mix the light emitted from the light emitting bodies having different emission colors in the color mixing section with good color mixing. The light emitted from the luminous body continues to
The light emitting area which has been reduced in the process of color mixing is enlarged by the light distribution unit. Therefore, according to the present invention, it is possible to provide a lighting device having a high color mixing property without reducing the light emitting area.

Here, the truncated cone is not limited to a figure in which the upper bottom face and the lower bottom face are similar figures (for example, both the upper bottom face and the lower bottom face are circular, and the areas are different). And the lower bottom surface are not similar figures (for example, the upper bottom surface is a square, whereas the lower bottom surface is a circle, etc.). A light emitting unit according to the present invention is a light emitting unit in which a plurality of light emitting bodies having different light emitting colors are mounted on a substrate, and a region including the light emitting body of the substrate is a lower bottom surface, and the lower bottom surface. A frustoconical body having an upper bottom surface having a smaller area than that, the inner peripheral surface of which is a reflecting surface, and the upper surface of the color mixing portion is the lower bottom surface, and the area of the lower bottom surface is smaller than that of the lower bottom surface. A truncated cone having a large upper bottom surface, the inner peripheral surface of which is a reflecting surface, and a light distribution portion whose inside is filled with a translucent material. By doing so, the optical path drawn when the light emitted from the light-emitting body passes through the inside of the color mixing section can be made longer than that described above, so that the color mixing effect can be further improved.

If the reflecting surface is a mirror surface,
The loss of light from the light-emitting body can be suppressed and the light can be efficiently emitted to the outside of the light-emitting unit. Further, the reflecting surface may be painted in a predetermined color. In this way, by the combination of the light emitting color of the light emitting body and the coating color of the reflecting surface,
The color of the light emitted by the light emitting unit can be adjusted to a desired light color.

Further, the inside of the color mixing portion is filled with a transparent material having a refractive index higher than that of the transparent material filling the light distribution portion, and The light-transmitting substance filling the light portion has a refractive index higher than that of air. By doing so, in the process in which the light emitted from the light emitter is emitted into the air, the light is refracted at the interface between the color mixing portion and the light distribution portion, and at the interface between the light distribution portion and the air, respectively, The light emitting area of the light emitting unit can be further expanded.

Further, the interface between the color mixing portion and the light distribution portion bulges toward the color mixing portion side, or the upper bottom surface of the light distribution portion bulges toward the light distribution portion side. By doing so, the light emitted from the light-emitting body is refracted at one or both of the interface between the color mixing portion and the light distribution portion and the interface between the light distribution portion and the air, so that the light emitting area of the light emitting unit is also reduced. It can be expanded more.

The illuminating device according to the present invention is characterized by using the above-mentioned light emitting unit, and achieves a significant reduction in thickness as compared with the conventional illuminating device, thereby effectively utilizing the space and illuminating environment. It is important to contribute to the improvement of

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a lighting device according to the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is an external view showing a configuration of an illumination device according to the present embodiment. In FIG. 1, the lighting device 1 includes a main body 11 and a power supply device 12.
The power supply device 12 is connected to the power plug 13 by a power cable in order to receive power from the commercial power supply, and also converts the power supplied from the commercial power supply into a predetermined rated power and supplies it to the main body 11. Therefore, the main body portion 11 is also connected by a power cable.

The main body 11 has a structure in which a large number of light emitting units are mounted on a substrate, and these light emitting units are supplied with power from a power supply device 12 and emit illumination light.
FIG. 2 is a circuit diagram showing the circuit configuration of the main body 11. In FIG. 2, the electronic circuit included in the main body 11 has four electrode terminals 110 to 113, and supplies the electric power received by these electrode terminals to the light emitting unit 114 and the like.

Each light emitting unit including the light emitting unit 114 is provided with three light emitting diodes each having a different light emitting color (for example, three colors of red, green and blue), and the light amount is adjusted for each light emitting color. The electrode terminals are individually provided so as to be able to. Electrode terminals 110 to 1 of the main body 11
Reference numeral 12 corresponds to each emission color of the light emitting diode, and the electrode terminal 113 is an electrode terminal for grounding which is shared between the emission colors.

The electrode terminals 110 to 113 are, for example, sockets fixed to a substrate forming the main body portion 11, and a power plug 13 at the tip of a power cable provided in the power supply device 12 is inserted into the power supply device. 12 is electrically connected. Alternatively, the tip of the power cable may be used as a crimp terminal and screwed to the corresponding electrode terminals 110 to 113.

Next, the light emitting unit will be described in more detail. 3A and 3B show the configuration of the light emitting unit, FIG. 3A is a plan view of the light emitting unit, and FIG. 3B is a sectional perspective view thereof. In FIG. 3A, the light emitting unit 2 has a square shape in plan view, and one side thereof has a length of 8.0 mm. In addition, there is a circular region centered on the center of the square at the center thereof, and the light emitting diode 201
~ 203 are provided.

The light emitting diodes 201 to 203 are arranged at positions so as to form an equilateral triangle when connecting the respective central positions. The length of one side of this equilateral triangle is 1.0 mm, and its center is substantially the same as that of the square. Each light emitting diode is a bare chip of approximately 0.3 mm square and has electrode terminals on the upper and lower surfaces thereof, and the electrode terminals on the upper surface are patterned on the substrate of the main body 11 and have a Cu pattern (gold pattern on the surface). Hereinafter, it will be simply referred to as "Cu pattern").

As shown in FIG. 3B, the light emitting unit 2
Has a structure in which the light emitting diodes 201 to 203 are mounted on the substrate 23, and the resin layer 21,
The reflector 22 is formed. The resin layer 21 is a transparent resin and allows light emitted from the light emitting diodes 201 to 203 to pass therethrough. Further, the surface of the reflection plate 22 that is in contact with the resin layer 21 is a reflection surface (a mirror surface in the present embodiment), and reflects the light traveling from the resin layer 21 toward the reflection plate 22.

The substrate 23 also includes a light emitting diode 201.
A Cu pattern is formed so that an appropriate current can be made to flow to each of the to ~ 203.
By doing so, it is possible to adjust the amount of current and achieve a more suitable light color as the entire lighting device 1. The substrate 23 may be a multilayer substrate, and it is desirable to select the number of layers according to the Cu pattern.

FIG. 4 is an enlarged view of FIG. 3 (b).
The resin layer 21 includes a light distribution layer 21a and a color mixing layer 2 depending on its function.
1b. The color mixing layer 21b is made of a columnar translucent resin having a bottom diameter of 3.0 mm and a height of 0.8 mm. Further, the light distribution layer 21a has a lower bottom surface with the color mixing layer 2
It is made of a truncated cone-shaped translucent resin having a circular shape with a diameter of 3.0 mm like the upper bottom surface of 1b and an upper bottom surface like the upper surface of the light emitting unit 2 with a square shape of 8.0 mm on a side.

As described above, the color mixture layer 21b of the reflection plate 22.
The surface S3 in contact with is a reflecting surface, and the light emitted from the light emitting diodes 201 to 203 is reflected by the reflecting surface S3 many times. Accordingly, the light emitting diodes 201 to 203
The light radiated by is extended in the optical path until it escapes from the color mixing layer 21b and is mixed. Light distribution layer 1 without the color mixing layer 21b
After entering the light distribution layer 21a, the light entering the inside 2a is incident on the interface S1 between the resin layer 21 and the outside air at a shallow angle, and is reflected by the interface S1. As described above, the reflector 22
The surface S2 in contact with the light distribution layer 21a is also a reflection surface,
The light reflected at the interface S1 travels in the light distribution layer 21a, reaches the reflection surface S2, and is reflected again toward the interface S1.

At this time, the light emitted from the light emitting diodes 201 to 203 is reflected away from the color mixing layer 21b.
The light is incident on the interface S1 at a deeper angle each time it is reflected by the reflection surface S2. When the incident angle on the interface S1 becomes smaller than the critical angle, the light passes through the interface S1 and the light emitting unit 2 Go out. In this way
It is possible to obtain the effect of enlarging the light emitting area of the entire light emitting unit 2. That is, the light emitting diodes 201 to 2 whose light emitting areas are narrowed in the process of color mixing in the color mixing layer 21b.
The emitted light of No. 03 passes through the light distribution layer 21a, so that the light emitting area is enlarged without impairing the color mixing property.

FIG. 5 is a plan view of the light emitting unit 2 in a plan view with the resin layer 21 and the reflection plate 22 removed.
Cu patterns 23a to 23f are patterned on the substrate 23. In the light emitting diode 201, one electrode is directly die-bonded on the Cu pattern 23d by Ag paste, and the other electrode is connected to the Cu pattern 23a by wire bonding. Similarly, the light emitting diode 202 has Cu patterns 23b and 23e,
The light emitting diode 203 is connected to the Cu patterns 23b and 23e, respectively.

With the above arrangement, the lights emitted from the light emitting diodes 201 to 203 having different emission colors for each light emitting unit are mixed, and the lighting device 1 can be a lighting device having a high color mixing property. . In particular, the color mixture layer 21b
Thus, by extending the optical paths of the emitted light of the light emitting diodes 201 to 203, it is possible to obtain the color mixing effect while suppressing the thickness of the lighting device 1.

FIG. 6 shows three light emitting diodes 201-2.
FIG. 3 is a diagram showing a far field pattern of each light emitting diode when 03 is located at the apex of an equilateral triangle having a side of 1 mm. In FIG. 6, the light emitting diodes 201 to 203 are far field patterns FFP1 to FFP3, respectively.
Present. This far field pattern FFP1 to F
The color mixing property is high in the portion where the FP3 overlaps each other.

On the other hand, the shaded areas in the far-field patterns FFP1 to FFP3 have little or no overlap with other far-field patterns, so that the color mixing property is low. According to the present invention, since the portion having low color mixing property is reflected inward by the reflecting surface S3, the color mixing property can be significantly improved as compared with the case where the light emitting diodes are simply arranged in proximity.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
A lighting device according to the embodiment of the present invention will be described with reference to the drawings. The configuration of the lighting device according to the second embodiment is almost the same as the configuration of the lighting device according to the first embodiment, but the configuration of the portion corresponding to the resin layer 21 in the first embodiment is different. Therefore, the part corresponding to the resin layer 21 will be described below.

In the first embodiment, the resin layer 21
However, the resin layer 21 of the present embodiment has different physical properties between the light distribution layer 21a and the color mixing layer 21b. That is, the refractive index of air is n1, the refractive index of the light distribution layer 21a is n2, and the refractive index of the color mixing layer 21b is n.
When expressed as 3, there is the following relationship between them.

N1 <n2 <n3 In order to obtain a desired resin by adjusting the refractive index, for example,
Urethane, Polycarbonate
ate), epoxy (Epoxy), silicon resin (silicon re
It is sufficient to adjust the polymerization ratio in (sin) etc. Further, the refractive index n3 of the color mixing layer 1b is preferably set to a value close to the refractive index of the light emitting diodes 201 to 203. By doing so, the light extraction efficiency from the light emitting diodes 201 to 203 can be increased.

FIG. 7 is a view exemplifying the optical path of the emitted light of the light emitting diode passing through the resin layer 21 of the light emitting unit 2 according to this embodiment. As shown in FIG. 7, light passing through the resin layer 21 is refracted at the interface S4 between the light distribution layer 21a and the color mixing layer 21b due to the difference in refractive index between the resins. Therefore, if the incident angle θ1 when entering the interface S4 is larger than 0 ° and smaller than the critical angle, the angle θ2 at which the same light enters the interface S1 is larger than θ1.

Therefore, the light traveling from the center to the periphery of the light emitting unit 2 travels further away from the center than in the first embodiment. That is, by making the light distribution layer 21a and the color mixing layer 21b have different refractive indices as described above, the light emitting area can be expanded and the peripheral portion of the light emitting unit can be made brighter.

(Third Embodiment) Next, the third embodiment of the present invention
A lighting device according to the embodiment will be described with reference to the drawings. Since the lighting device according to the present embodiment has substantially the same configuration as the lighting device according to the above-described embodiments, the description below will be focused on the part that characterizes the present embodiment.

In the above embodiment, the color mixing layer 21b of the light emitting unit 2 has a substantially cylindrical shape, and is in contact with the diameter of the color mixing layer 21b on the substrate 23 side (lower bottom side) and the light distribution layer 21a. The diameter on the side (upper bottom side) is almost the same. On the other hand, in the color mixing layer 21b in the present embodiment, the diameter on the upper bottom side is smaller than the diameter on the lower bottom side.

Therefore, the reflecting surface S3 of the reflection plate 22 which is in contact with the color mixing layer 21b is inclined toward the inside of the color mixing layer 21b. FIG. 8 is a diagram showing a cross section of one light emitting unit 2 constituting the lighting device according to the present embodiment, and also showing an optical path of light passing through the resin layer 21. Figure 8
As shown in FIG. 5, the light paths of the light emitted from the light emitting diodes 201 to 203 are in the color mixing layer 2 because the reflecting surface S3 is inclined.
It is difficult to escape from 1b.

Therefore, the light path of the light emitted from the light emitting diodes 201 to 203 in the color mixing layer 21b is further extended as compared with the light path in the above-mentioned embodiment, so that a higher color mixing effect can be obtained. In the present embodiment, the light emitted from the light emitting diodes 201 to 203 is easily irradiated onto the interface S5 between the color mixing layer 21b and the substrate 23 due to the inclination of the reflecting surface S3, and thus the interface S5 is used as a mirror surface for light emission. The luminous efficiency of the unit 2 as a whole is improved.

As described above, as the reflecting surface S3 is inclined inward, the light path length until the emitted light of the light emitting diodes 201 to 203 leaves the color mixing layer 21b becomes longer, so that the color mixing property can be improved. it can. Therefore, in order to obtain the effect of the present invention, the angle formed by the reflecting surface S3 with respect to the substrate 23 is 9 at the point where the reflecting surface S3 contacts the substrate 23.
It is preferably 0 ° or the reflecting surface S3 is inclined toward the inside of the color mixing layer 21b.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
A lighting device according to the embodiment will be described with reference to the drawings. Also in the present embodiment, the configuration and effects will be described focusing on the differences from the other embodiments. FIG. 9 is a cross-sectional perspective view showing a vertical cross section of the light emitting unit 2 that constitutes the lighting device according to the present embodiment.

As shown in FIG. 9, the light distribution layer 21a and the color mixing layer 2
The interface S4 of 1b bulges toward the light emitting diodes 201 to 203. The interface S1 between the light distribution layer 21a and the outside air also bulges toward the light emitting diodes 201 to 203. These interfaces S1 and S4 form, for example, a spherical surface or a parabolic surface whose axis is the rotation center axis of the mixing layer 12b having a substantially cylindrical shape.

With this structure, the optical path of the light emitted from the light emitting diode is refracted toward the peripheral portion of the light emitting unit 2 due to the bulging of the interfaces S1 and S4. , The same effect as the second embodiment,
That is, the light emitting area of the light emitting unit 2 can be increased, and the peripheral portion of the light emitting unit can be made brighter.

In this embodiment, the interface S1,
Although the case where both S4 are swollen has been described, the same effect can be obtained even if only one of the interfaces is swollen. Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and the following modifications can be implemented.

(Modifications) (1) In the above embodiment, several methods for mixing the light emitted from a plurality of light emitting diodes to increase the light emitting area of the light emitting unit have been described. It is also possible, and thereby a greater effect can be obtained.

For example, the refractive index of the resin filled in the light distribution layer and the refractive index of the resin filled in the color mixing layer are made different, and the interface between the light distribution layer and the color mixing layer is directed toward the light emitting diode side. The light emitting area of the light emitting unit can be further increased by bulging the light emitting unit. (2) Although the external dimensions of the light emitting unit are illustrated in the first embodiment, this is only an example, and even if the external dimensions differ from the above, the effect of the present invention can be obtained. . However, the smaller the distance between the light emitting diodes, the better the color mixing property. Regarding the shape of the color mixing layer, the smaller the diameter surrounding the light emitting diode and the higher the height from the substrate to the light distribution layer, the more the color mixing property can be improved.

The height from this substrate to the light distribution layer must be at least higher than that of the light emitting diode. If the diameter surrounding the light emitting diode is made smaller, the color mixing effect can be obtained even if the height from the substrate to the light distribution layer is made smaller than that in the case where the diameter surrounding the light emitting diode is larger. When the height to the light distribution layer is made higher, the color mixing effect can be obtained even if the diameter surrounding the light emitting diode is made larger than in the case where the height from the substrate to the light distribution layer is lower.

(3) In the second embodiment, the case where the light distribution layer and the color mixing layer have different refractive indexes has been described, but instead of this, the following may be adopted. That is, as it approaches the interface S1 from the substrate,
Alternatively, the refractive index may be continuously reduced. Even in this case, the same effect as that of the second embodiment can be obtained.

Although the interfaces S1 and S4 are swollen to adjust the optical path in the fourth embodiment, the interfaces S1 and S4 may be replaced by Fresnel lenses. In this way, the interface S1 and the interface S
Since the height of 4 can be suppressed and the thickness of the light emitting unit can be suppressed, the overall size of the lighting device can be reduced.

(4) In the above-described embodiment, the surfaces S2 and S3 of the reflection plate 22 in contact with the resin layer 21 and the substrate 2 are provided.
Although the surface S5 contacting the resin layer 21 of 3 is a mirror surface,
Instead of this, it is also possible to paint in a color that matches the emission color of the lighting device. For example, in the case of constructing an illuminating device that emits white light, it is effective to adjust the light color emitted by the illuminating device if these surfaces S2, S3, and S5 are painted white.

In addition, for example, in order to make the light color emitted by the illuminating device a bluish color, these surfaces S2, S
3 and S5 should be painted blue. Whatever the light color is, if the coating color of the surfaces S2, S3, S5 is determined from the relationship between the light color to be emitted by the lighting device and the light color emitted from the light emitting diode, the desired illumination color can be obtained. Obtainable.
Further, although the resin layer 21 is made of a transparent resin in the above-mentioned embodiment, the resin layer 21 may also be colored and transparent in order to adjust the light color emitted by the lighting device. For example, in order to obtain a reddish light color, the resin layer 21 may be a reddish transparent resin.

Further, in the above-mentioned embodiment, the three types of light emitting diodes are used according to the color of emitted light, but instead of this, two or more types of light emitting are made in accordance with the light color of the target lighting device. If a diode is selected, the present invention can be implemented and its effect can be obtained. (5) In the above-described embodiment, the light emitting unit has a substantially square shape in plan view and the color mixing layer has a circular shape in plan view, but it may have another shape instead. FIG. 10 is a diagram illustrating the appearance of a light emitting unit having a shape other than the shape shown in the above embodiment, and is an external perspective view of the light emitting unit having a substantially hexagonal shape in plan view.

In FIG. 10, in the center of the light emitting unit, there is a color mixing layer, which is a circular area having the same center as the hexagon, and a light emitting diode is mounted therein. By doing so, it is possible to suppress variation in the distance from the center of the light emitting unit to the peripheral edge, as compared with the case where the light emitting unit has a substantially square shape in plan view, and thus suppress uneven light amount in the light emitting unit alone. You can

The color-mixing layer may be, for example, a substantially triangular shape in plan view, and light-emitting diodes may be arranged at the three corners. In addition, when the brightness of the light emitting diode is different for each light emission color for the purpose of adjusting the light color of the entire light emitting unit and the lighting device, the light emitting diode should be arranged in the color mixing layer accordingly. You may decide.

(6) In the above-described embodiment, the inclination of the surface of the reflection plate 22 in contact with the light distribution layer 21a and the reflection plate 22.
Although the case has been described in which the slope of the surface in contact with the color mixing layer 21b changes discontinuously, it may be replaced with the following. That is, the inclination angle of the side surface of the resin layer 21 may be changed stepwise or continuously,
Even in this case, the effect of the present invention can be obtained.

(7) In the above embodiment, 1
Although the number of the light emitting diodes mounted in the light emitting unit is set to three, the present invention is not limited to this, and the effect can be obtained if two or more light emitting diodes are mounted in one light emitting unit. . Regarding the light emission color of the light emitting diode, among the plurality of light emitting diodes mounted in one light emitting unit, there may be light emitting diodes having the same light emission color.

(8) In the above embodiment, the material of the reflection plate 22 was not particularly referred to, but examples thereof include the following. If a metal such as aluminum or stainless steel is used as the material of the reflection plate 22, the efficiency of heat radiation from the front surface of the substrate can be improved. As a result, with respect to the light emitting diodes 201 to 203, it is possible to prolong the life of the light emitting diodes 201 to 203, prevent the emission efficiency from decreasing due to the temperature rise, and prevent the emission wavelength from shifting.

A resin may be used as the material of the reflector 22. In this case, the surface of the resin may be plated with aluminum or the like to form a reflecting surface to prevent the transmission of light into the inside of the reflecting plate 22. As an advantage of using a resin, it has good workability and can be reduced in weight. In addition, in the above-described embodiment, the emitted light of the light emitting diodes 201 to 203 passes through the inside of the resin layer 21, but the material of the resin layer 21 is not glass but resin other than resin. May be used.

[0056]

As described above, according to the present invention,
Since the light emitted from the light emitting diodes of a plurality of colors is mixed by providing the color mixing layer, a lighting device with high color mixing can be provided. Further, according to the present invention, since the light distribution layer is provided and the light is spread to the peripheral portion of the light emitting unit, the light emitting area can be expanded and the light amount of the peripheral portion of the light emitting unit can be improved.

[Brief description of drawings]

FIG. 1 is an external view showing a schematic configuration of a lighting device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of an electronic circuit provided in a main body section 11 which constitutes the lighting device 1.

3A and 3B are diagrams showing a configuration of a light emitting unit 2 forming a main body portion 11, FIG. 3A is a plan view of the light emitting unit 2, and FIG. It is a cross-sectional perspective view showing.

FIG. 4 is a sectional perspective view of the light emitting unit 2 (see FIG.
It is the figure which expanded (b) and showed details.

FIG. 5 is a plan view of the light emitting unit 2 in a plan view with a resin layer 21 and a reflection plate 22 removed.

FIG. 6 is a diagram showing a far-field pattern of each of the three light emitting diodes 201 to 203 when the centers thereof are located at the vertices of an equilateral triangle having a side of 1 mm.

FIG. 7 is a diagram exemplifying an optical path of emitted light of a light emitting diode which passes through a resin layer 21 in the light emitting unit 2 according to the second embodiment of the present invention.

FIG. 8 is a diagram showing a vertical cross section of one light emitting unit 2 constituting an illuminating device according to a third embodiment of the present invention, and also showing an optical path of light passing through a resin layer 21. .

FIG. 9 is a view showing a cross section of a light emitting unit 2 that constitutes an illumination device according to a fourth embodiment of the present invention.

FIG. 10 is an external perspective view of a light emitting unit according to a modified example (5) of the present invention, which is a bird's-eye view of a light emitting unit having a substantially hexagonal shape in plan view.

[Explanation of symbols]

1 Lighting device 2,114 light emitting unit 11 Main body 12 power supply 13 Power plug 21 Resin layer 21a Light distribution layer 21b Mixed color layer 22 Reflector 23 board 23a-23f Cu pattern 110-113 electrode terminals 201-203 light emitting diode FFP1 to FFP3 Far field pattern S1-S5 interface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuyuki Matsui             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5F041 AA11 DA14 DA19 DA33 DA36                       DA43 DA82 DB08 DC08 DC22                       DC23 DC66 DC83 FF11

Claims (8)

[Claims] 1. A light emitting unit in which a plurality of light emitting bodies having different light emitting colors are mounted on a substrate, which is a cylindrical body having a lower bottom surface in a region including the light emitting body of the substrate, A frusto-conical body having a color mixing portion whose peripheral surface is a reflection surface, an upper bottom surface of the color mixing portion being a lower bottom surface, and an upper bottom surface having a larger area than the lower bottom surface, the inner peripheral surface of which is reflective. A light-emitting unit, which has a surface and a light distribution portion whose inside is filled with a translucent material. 2. A light emitting unit in which a plurality of light emitting bodies having different light emitting colors are mounted on a substrate, wherein a region including the light emitting body of the substrate is a lower bottom surface, and the area is smaller than the lower bottom surface. A frustoconical body having an upper bottom surface, the inner peripheral surface of which is a reflecting surface, and the upper bottom surface of the color mixing portion is the lower bottom surface, and the upper bottom surface has a larger area than the lower bottom surface. A light emitting unit, which is a truncated pyramid and has a light distribution portion whose inner peripheral surface is a reflecting surface and whose inside is filled with a light-transmitting substance. 3. The light emitting unit according to claim 1, wherein the reflection surface is a mirror surface. 4. The light emitting unit according to claim 1, wherein the reflecting surface is painted in a predetermined color. 5. The inside of the color mixing portion is filled with a transparent material having a refractive index higher than that of the transparent material filling the light distribution portion, and The light emitting unit according to claim 1, wherein the light-transmitting substance filling the light distribution portion has a refractive index higher than that of air. 6. The light emitting unit according to claim 1, wherein an interface between the color mixing section and the light distribution section bulges toward the color mixing section. 7. The light emitting unit according to claim 1, wherein an upper bottom surface of the light distribution portion is bulged toward the light distribution portion side. 8. An illumination device using the light emitting unit according to claim 1.