JP6648594B2 - Light emitting device and lighting device - Google Patents

Description

  Embodiments described herein relate generally to a light emitting device and a lighting device.

There is a light emitting device including a plurality of types of light emitting elements that emit different colors of light. Such a light emitting device can emit light of all colors (full color) by controlling the turning on and off of the light emitting elements for each light emitting color.
Here, there is a problem that it is difficult to mix colors depending on the color of light.
Therefore, if a plurality of types of light-emitting elements that emit different colors of light are simply provided in a dispersed manner, optical characteristics such as color unevenness and luminance unevenness may be deteriorated.
Therefore, it has been desired to develop a technology capable of improving optical characteristics such as color unevenness and luminance unevenness even when a plurality of types of light emitting elements having different colors of emitted light are provided.

JP 2014-082236 A

  The problem to be solved by the present invention is to provide a light emitting device and a lighting device that can improve optical characteristics.

The light-emitting device according to the embodiment is a light-emitting device that includes a plurality of types of light-emitting elements that emit different colors of light and can emit light of four or more types including two or more primary colors. A plurality of first light-emitting elements provided on the substrate and not including a phosphor and emitting red light; a phosphor provided on the substrate adjacent to the first light-emitting element ; A plurality of light emitting elements that emit blue or green light on the u′v ′ chromaticity diagram, in which the distance between the red light and the red light is the longest among the plural types of light emitting elements . A second light emitting element; diffusing the red light emitted from the plurality of first light emitting elements and the blue light or green light emitted from the plurality of second light emitting elements; And a diffusing portion that performs the following. On the substrate, the first light-emitting element and the second light-emitting element are adjacent to each other at two or more locations, and at the two or more locations, the red light and the blue light are emitted. System or green light is diffused by one diffusion unit , and the number of the first light emitting elements is larger than the number of the second light emitting elements .

  According to the embodiments of the present invention, it is possible to provide a light emitting device and a lighting device capable of improving optical characteristics.

FIG. 2 is a schematic plan view illustrating a light emitting device 1 according to the present embodiment. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is a schematic cross-sectional view illustrating a lighting device 100 according to the present embodiment.

The invention according to the embodiment is a light-emitting device that has a plurality of types of light-emitting elements that emit different colors of light and is capable of emitting light of four or more colors including two or more primary colors; A plurality of first light-emitting elements that are provided on the substrate and do not include a phosphor and emit red light; a plurality of first light-emitting elements that are provided adjacent to the first light-emitting element and that do not include a phosphor. , U′v ′ chromaticity diagram, a plurality of second light emitting elements that emit blue light or green light , the distance between the plurality of types of light emitting elements and the red light being the longest. A light emitting element; a diffusing unit that diffuses the red light emitted from the plurality of first light emitting elements and the blue light or green light emitted from the plurality of second light emitting elements. Wherein the first light emitting element and the second light emitting element are adjacent to each other on the substrate. Portion is present more than two locations, in the two positions or more portions, wherein the red light, the is a blue or green-based light, diffused by one of said diffusing section, the first light emitting The light emitting device has a larger number of elements than the number of the second light emitting elements .
According to this light emitting device, even when a plurality of types of light emitting elements having different light colors are provided, optical characteristics such as color unevenness and luminance unevenness can be improved.

Further, the first color may be reddish, and the second color may be blued or greenish.
It is difficult to mix the primary colors because the half width is narrow, but according to this light emitting device, the color mixing can be facilitated.

In addition, the first color may be green, and the second color may be blue.
It is difficult to mix the primary colors because the half width is narrow, but according to this light emitting device, the color mixing can be facilitated.

Further, the number of the first light emitting elements may be larger than the number of the second light emitting elements.
For example, a light-emitting element that emits red light easily absorbs light that has been reflected by a sealing portion and has entered the light-emitting element. Therefore, if the number of the first light-emitting elements that emit red light is increased, the amount of red light that is reduced by absorption can be compensated.

The invention according to an embodiment is a lighting device including the above light emitting device; and a housing in which the light emitting device is housed.
According to this illumination device, even when a plurality of types of light emitting elements having different light colors are provided, optical characteristics such as color unevenness and luminance unevenness can be improved.

  Hereinafter, embodiments will be described with reference to the drawings. In each of the drawings, similar components are denoted by the same reference numerals, and detailed description will be omitted as appropriate.

(Light emitting device)
FIG. 1 is a schematic plan view illustrating a light emitting device 1 according to the present embodiment.
In FIG. 1, the sealing portion 40, the wiring pattern 12, and the like are omitted to avoid complication.
FIG. 2 is a sectional view taken along line AA in FIG.
As shown in FIGS. 1 and 2, the light emitting device 1 includes a substrate 10, a light emitting unit 20, a frame 30, and a sealing unit 40.

The substrate 10 has a base 11 and a wiring pattern 12.
The base 11 has a plate shape. The base 11 is preferably formed using a material having high thermal conductivity. The material having high thermal conductivity can be, for example, an inorganic material such as ceramics (for example, aluminum oxide or aluminum nitride), or a metal plate whose surface is coated with an insulating material. When the surface of the metal plate is coated with an insulating material, the insulating material may be made of an organic material or may be made of an inorganic material.

  The wiring pattern 12 has a mounting pad 12a, a wiring portion 12b, a conductive via 12c, and an input terminal 12d. The mounting pad 12 a is provided on one surface of the base 11. The mounting pad 12a is provided inside the frame 30.

  The wiring section 12b is provided on the surface of the base 11 opposite to the side on which the mounting pads 12a are provided. One end of the wiring portion 12b is electrically connected to the mounting pad 12a via the conductive via 12c. The other end of the wiring portion 12b is electrically connected to the input terminal 12d.

  The conductive via 12c penetrates the base 11 in the thickness direction. One end of the conductive via 12c is electrically connected to the mounting pad 12a. The other end of conductive via 12c is electrically connected to wiring portion 12b.

The input terminal 12d is provided on the surface of the base 11 opposite to the side on which the mounting pads 12a are provided. The arrangement position of the input terminal 12d is not particularly limited. The input terminal 12d can be provided, for example, near the periphery of the base 11.
The wiring portion 12b and the input terminal 12d can be provided on the surface of the base 11 on the side where the mounting pads 12a are provided. In this case, the conductive via 12c can be omitted. In addition, the input terminal 12d can be provided outside the frame 30.

Further, one set of the mounting pad 12a, the wiring portion 12b, the conductive via 12c, and the input terminal 12d can be provided for each type of light emitting element (each light emitting element 20y to 20b2).
In addition, a power supply, a control device, and the like (not shown) provided outside the light emitting device 1 are electrically connected to the input terminals 12d provided for each type of light emitting element. Therefore, the light emitting device 1 can emit light of all colors (full color) by controlling lighting and extinguishing for each type of light emitting element.
The base 11 can have a single-layer structure as illustrated in FIG. 2 or a multilayer structure.

  The material of the wiring pattern 12 is not particularly limited as long as it is a conductive material. The material of the wiring pattern 12 can be, for example, a metal such as silver, copper, gold, and tungsten. When the material of the base 11 is a ceramic, the substrate 10 can be formed by using, for example, an LTCC (Low Temperature Co-fired Ceramics) method. For example, the substrate 10 can be formed by simultaneously firing the base 11 and the wiring pattern 12 at a temperature of 900 ° C. or less.

  Further, a heat spreader (not shown) may be provided on the surface of the substrate 10 opposite to the side on which the light emitting unit 20 is provided. A heat spreader (not shown) can be connected to the substrate 10 via heat conductive grease, solder, or the like. If a heat spreader (not shown) is provided, conduction and dispersion of heat generated in the light emitting unit 20 can be achieved. Therefore, since the power applied to the light emitting unit 20 can be increased, the amount of light emitted from the light emitting device 1 can be increased. In addition, since it is easy to secure a heat conduction path, it is possible to suppress an increase in the temperature of the sealing unit 40, and thus the temperature of the light emitting unit 20.

  The light emitting section 20 includes light emitting elements 20y, 20o, 20r, 20c, 20b1, 20g, and 20b2. The light emitting elements 20y, 20o, 20r, 20c, 20b1, 20g, and 20b2 are provided on one surface of the substrate 10.

The light emitting element 20y emits, for example, yellow light. The light emitting element 20y emits, for example, light having a peak wavelength of 570 nm or more and 590 nm or less. The light emitting element 20y may include, for example, a light emitting diode that emits blue light and a phosphor that is provided on the light emitting surface of the light emitting diode and emits yellow fluorescent light.
The light emitting element 20o emits, for example, orange light. The light emitting element 20o emits light with a peak wavelength exceeding 590 nm and 620 nm or less, for example. The light emitting element 20o may include, for example, a light emitting diode that emits blue light and a phosphor that is provided on the light emitting surface of the light emitting diode and emits amber fluorescence.
The light emitting element 20r emits, for example, red light. The light emitting element 20r can be, for example, a light emitting diode that emits light having a peak wavelength of 610 nm or more and 660 nm or less.

The light emitting element 20c, the light emitting element 20b1, and the light emitting element 20b2 emit blue light.
The light emitting element 20c emits, for example, cyan light. The light emitting element 20c can be, for example, a light emitting diode that emits light having a peak wavelength of 500 nm or more and 505 nm or less.
The light emitting element 20b1 can be, for example, a light emitting diode that emits blue light having a peak wavelength of about 475 nm.
The light emitting element 20b2 can be, for example, a light emitting diode that emits blue light having a peak wavelength of about 450 nm.

  The light emitting element 20g emits, for example, green light. The light emitting element 20g can be, for example, a light emitting diode that emits light with a peak wavelength exceeding 505 nm and not exceeding 540 nm.

  The light emitting elements 20y to 20b2 are mounted on the mounting pads 12a using a COB (Chip on Board) method. The light emitting elements 20y to 20b2 are joined on the mounting pads 12a1 to 12g1 via silver paste or silver nanopaste. The light emitting elements 20y to 20b2 can be upper and lower electrode type light emitting diodes, flip chip type light emitting diodes, or the like.

  Here, in the light emitting diode of the upper and lower electrode type, the light emitting layer for generating light is provided inside the light emitting diode on the opposite side (upper side) to the substrate 10 side. On the other hand, in a flip-chip type light emitting diode, a light emitting layer for generating light is provided on the substrate 10 side (lower side) inside the light emitting diode. Then, the light emitting layer provided on the light emitting diode becomes a heat source. Therefore, if a flip-chip type light emitting diode in which a light emitting layer serving as a heat source is provided closer to the substrate 10 can improve heat dissipation. On the other hand, if a light emitting diode of the upper and lower electrode type is used, the upper electrode and the mounting pad 12a are electrically connected via the wiring 21, so that the degree of freedom regarding the arrangement position of the mounting pad 12a can be increased. Therefore, even when the light emitting elements 20y to 20b2 are mounted at a high density, the design of the wiring pattern 12 becomes easy.

The light emitting elements 20y to 20b2 illustrated in FIG. 2 are all upper and lower electrode type light emitting diodes. However, if necessary, all of the light-emitting elements 20y to 20b2 may be flip-chip type light-emitting diodes, or a mixture of upper and lower electrode type light-emitting diodes and flip-chip type light-emitting diodes.
For example, in the light emitting element 20r that emits red light, the luminous efficiency may decrease or the emission color may shift as the temperature increases. Further, the phosphors provided in the light emitting elements 20y and 20o can be a heat source. Therefore, the light emitting elements 20y, 20o, and 20r can be flip-chip type light emitting diodes with high heat dissipation.

  When the light emitting elements 20y to 20b2 are upper and lower electrode type light emitting diodes, the electrodes (lower electrodes) on the substrate 10 side of the light emitting elements 20y to 20b2 are made of lead-free solder (SAC: SnAgCu, etc.), gold tin (AuSn). ) It is electrically connected to the mounting pad 12a via a conductive bonding material such as an alloy paste, a silver paste, and a silver nanopaste. The electrodes (upper electrodes) of the light emitting elements 20y to 20b2 on the side opposite to the substrate 10 side are electrically connected to the mounting pads 12a via the wirings 21. The wiring 21 can be connected using, for example, a wire bonding method.

  When the light emitting elements 20y to 20b2 are flip-chip type light emitting diodes, the electrodes of the light emitting elements 20y to 20b2 are made of a conductive bonding material such as lead-free solder, gold-tin alloy paste, silver paste, or silver nano paste. Through this, it is electrically connected to the mounting pad 12a.

Next, the arrangement of the light emitting elements 20y to 20b2 will be described.
The region where the light emitting element is provided (for example, the region inside the frame portion 30) has a central region 14 and a peripheral region 13 surrounding the central region 14. The peripheral region 13 has an annular shape.
As described above, the light-emitting element 20r that emits red light may decrease the luminous efficiency or shift the luminescent color as the temperature increases. If the luminous efficiency decreases or the luminescent color shifts, color unevenness and luminance unevenness may occur. Therefore, it is preferable that the disposition position of the light emitting element 20r be determined in consideration of heat dissipation. In this case, the peripheral region 13 radiates heat more easily than the central region 14. Therefore, the light emitting element 20r is preferably provided in the peripheral region 13.

  When the plurality of light emitting elements 20r are gathered in the peripheral region 13, when the light emitting device 1 emits only red light, it seems that ring-shaped light is applied to the irradiation surface. However, red light is easily diffused because it has a long wavelength and a wide half width. Therefore, even if the plurality of light emitting elements 20r are collected in the peripheral area 13, it is possible to suppress the irradiation of the irradiation surface with the ring-shaped red light.

  The light-emitting elements 20c, 20b1, and 20b2 that emit blue light have a short wavelength and a small half-value width, so that they are not easily diffused. Therefore, when the light-emitting elements 20c, 20b1, and 20b2 are collected in the peripheral area 13, when the light-emitting device 1 emits only blue or cyan light, ring-shaped light may be irradiated on the irradiation surface. Therefore, the light emitting elements 20c, 20b1, and 20b2 are preferably provided in the central region 14.

  Note that the light-emitting elements 20c, 20b1, and 20b2 are less likely to decrease in luminous efficiency or shift in luminescent color with an increase in temperature. Therefore, even if the light emitting elements 20c, 20b1, and 20b2 are provided in the central region 14 where heat is hardly dissipated, there is little possibility that color unevenness or luminance unevenness occurs.

Considering that the light-emitting device 1 emits white light, the total number of the light-emitting elements 20c, 20b1, and 20b2 is about １ ／ of the total number of the light-emitting elements 20y, 20o, 20r, and 20g. Therefore, if the small number of light emitting elements 20c, 20b1, and 20b2 are provided in the central region 14 having a small area, the distance between the light emitting elements is prevented from being excessively long or excessively short. be able to.
Further, the number of the light emitting elements 20r can be set to be larger than the number of the light emitting elements 20g and the total number of the light emitting elements 20c, 20b1, and 20b2. The light emitting element 20r that emits red light easily absorbs light that has been reflected by the sealing portion 40 and the like and has entered the light emitting element 20r. Therefore, if the number of light emitting elements 20r is increased, the amount of red light reduced by absorption can be compensated.

  The light emitting element 20y that emits yellow light and the light emitting element 20o that emits orange light have phosphors. Therefore, when the light emitting elements 20y and 20o are adjacent to the light emitting elements 20c, 20b1 and 20b2 that emit light with a short wavelength, the light with the short wavelength emitted from the light emitting elements 20c, 20b1 and 20b2 enters the phosphor. Unintended fluorescence may occur. When unintended fluorescence is generated, color reproducibility may decrease. Therefore, it is preferable that the light emitting elements 20y and 20o are not adjacent to the light emitting elements 20c, 20b1 and 20b2 as much as possible.

  For example, the light emitting elements 20y and 20o are preferably provided in the peripheral region 13 as much as possible. It should be noted that even if red light with a long wavelength enters the phosphors of the light emitting elements 20y and 20o, no fluorescence is generated. Therefore, even if the light emitting element 20r that emits red light and the light emitting elements 20y and 20o are provided in the peripheral region 13, there is no possibility that unintended fluorescence is generated.

  That is, at least a part of the plurality of light-emitting elements 20y, the plurality of light-emitting elements 20o, and the plurality of light-emitting elements 20r is outside the region where the plurality of light-emitting elements 20c, the plurality of light-emitting elements 20b1, and the plurality of light-emitting elements 20b2 are provided. It is provided in.

  Further, since the light emitting element 20r has no phosphor, there is no possibility that unintended fluorescence is generated even when the light emitting element 20r and the light emitting elements 20c, 20b1, and 20b2 are adjacent to each other. Therefore, it is more preferable to provide the light emitting element 20r between the light emitting elements 20y, 20o and the light emitting elements 20c, 20b1, 20b2. By doing so, the distance between the light emitting elements 20y, 20o and the light emitting elements 20c, 20b1, 20b2 can be increased, so that the occurrence of unintended fluorescence in the light emitting elements 20y, 20o can be suppressed. it can.

  In this case, it is preferable that the number of the light emitting elements 20y and 20o adjacent to the light emitting elements 20c, 20b1 and 20b2 be smaller than the number of the light emitting elements 20r adjacent to the light emitting elements 20c, 20b1 and 20b2.

  Since the light emitting element 20g emits light having a longer wavelength than the light emitting elements 20c, 20b1, and 20b2, the light emitting element 20g may be provided between the light emitting elements 20y and 20o and the light emitting elements 20c, 20b1, and 20b2. it can. In this case, it is more preferable to provide the light emitting element 20g between the light emitting element 20r and the light emitting elements 20c, 20b1, and 20b2. By doing so, the distance between the light emitting elements 20y, 20o and the light emitting elements 20c, 20b1, 20b2 can be further increased, so that the occurrence of unintended fluorescence in the light emitting elements 20y, 20o is further suppressed. be able to.

When the area of the light emitting surface 40a of the sealing portion 40 (the light emitting area of the light emitting device 1) is S1 and the total area of the light emitting elements 20y to 20b2 is S2, S2 / S1 is less than 0.2. By doing so, the distance between the light emitting elements 20y to 20b2 becomes longer, so that it becomes easier to suppress the generation of unintended fluorescence in the light emitting elements 20y and 20o.
However, if S2 / S1 is less than 0.2, the distance between the light emitting elements 20y to 20b2 becomes too long, and a larger light emitting area is required to obtain the same light amount.

On the other hand, when S2 / S1 exceeds 0.3, the distance between the light emitting elements 20y to 20b2 is too short, and unintended fluorescence is easily generated in the light emitting elements 20y and 20o.
Therefore, it is preferable that S2 / S1 be 0.2 or more and 0.3 or less.

Further, there is a problem that it is difficult to mix colors depending on the color of light.
Therefore, if a plurality of types of light-emitting elements that emit different colors of light are simply provided in a dispersed manner, optical characteristics such as color unevenness and luminance unevenness may be deteriorated.
According to the knowledge obtained by the present inventors, color mixing can be facilitated by shortening the distance between light emitting elements where the color difference of emitted light is large.
For example, if light-emitting elements having a large difference in color of emitted light are provided adjacent to each other, color mixing can be facilitated.

In this case, the difference in light color can be obtained from the distance on the u'v 'chromaticity diagram.
Therefore, when arranging a plurality of types of light-emitting elements that emit different colors of light, the distance is determined for each color of light by a u′v ′ chromaticity diagram, and the light-emitting elements having a longer distance are provided adjacent to each other. What should I do?

In this case, among the colors of the light emitted from the light emitting elements 20y to 20b2, those having the longest distance on the u'v 'chromaticity diagram are red light and green light.
Therefore, as can be seen from FIG. 1, the light emitting element 20g is provided as close as possible to the light emitting element 20r.
The next longer distances on the u'v 'chromaticity diagram are green light and blue light.
Therefore, as can be seen from FIG. 1, the light emitting element 20g is provided as close as possible to the light emitting elements 20c, 20b1, and 20b2.
In this case, as can be seen from FIG. 1, the light emitting element 20g can be provided between the light emitting element 20r and the light emitting elements 20c, 20b1, and 20b2.

  Further, as described above, the light emitting elements 20c, 20b1, and 20b2 are provided on the center side of the area where the light emitting element is provided, and the light emitting element 20r is provided on the peripheral side of the area where the light emitting element is provided. Therefore, as can be seen from FIG. 1, the light emitting elements 20c, 20b1, 20b2, the light emitting element 20g, and the light emitting element 20r are arranged in this order from the center side to the peripheral side of the region where the light emitting elements are provided. be able to.

  The frame portion 30 has a frame shape. The frame portion 30 is provided on a surface of the substrate 10 on which the light emitting elements 20y to 20b2 are provided. The frame part 30 is provided so as to surround the light emitting elements 20y to 20b2. The frame portion 30 can be formed from, for example, a resin such as PBT (polybutylene terephthalate) or PC (polycarbonate), ceramics, or the like.

When the material of the frame portion 30 is a resin, particles made of titanium oxide or the like can be mixed to improve the reflectance with respect to light emitted from the light emitting elements 20y to 20b2. Note that the present invention is not limited to particles of titanium oxide, and particles made of a material having a high reflectance with respect to light emitted from the light emitting elements 20y to 20b2 may be mixed. Moreover, the frame part 30 can also be formed from white resin, for example. That is, the frame portion 30 can have both the function of defining the region where the sealing portion 40 is formed and the function of the reflector. Note that the shape of the frame portion 30 is not limited to the illustrated one, and can be changed as appropriate.
Further, the frame portion 30 is not always necessary and can be omitted. When the frame portion 30 is not provided, the shape of the sealing portion 40 can be, for example, a dome shape.

  The sealing section 40 is provided inside the frame section 30. When the light emitting surface 40 a of the sealing portion 40 is a flat surface, the height of the sealing portion 40 is preferably lower than the height of the frame portion 30. By doing so, it is possible to prevent the resin from overflowing to the outside of the frame portion 30 when supplying a resin described later. The sealing section 40 is provided so as to cover the light emitting elements 20y to 20b2. When the light emitting surface 40a of the sealing portion 40 is a flat surface, the height of the sealing portion 40 is, for example, about 2 to 5 times the thickness of the light emitting elements 20y to 20b2. it can. In addition, the thickness dimension of the light emitting elements 20y to 20b2 can be about 0.1 mm.

  Further, the light emitting surface 40a of the sealing portion 40 may be, for example, a dome-shaped curved surface.

Further, the diffusion part 40b can be provided in the sealing part 40.
The diffusion unit 40b diffuses light emitted from the light emitting elements 20y to 20b2.
The diffuser 40b can be, for example, fine irregularities provided on the light emitting surface 40a. There is no particular limitation on the size and shape of the irregularities, and it is only necessary that the light incident on the diffusing portion 40b be diffused.
In addition, the unevenness can be provided in the entire area of the light emitting surface 40a, or can be provided in a predetermined area. The density of the unevenness may be constant or may be partially different.

  The unevenness is formed by, for example, performing a blast treatment or a chemical treatment on the light emitting surface 40a of the sealing portion 40, or pressing a mold material against the light emitting surface 40a when forming the sealing portion 40. Can be.

  Further, as the diffusion portion 40b, a layer containing a diffusion material (for example, particles such as silicon oxide) can be provided on the sealing portion 40 or on the light emitting surface 40a side of the sealing portion 40. However, when a layer containing a diffusing material is provided, light extraction efficiency may be reduced. For this reason, it is more preferable that the diffusion portion 40b has fine irregularities provided on the light emission surface 40a.

  By providing the diffusion portion 40b, light emitted from the light emitting elements 20y to 20b2 can be diffused, so that the occurrence of color unevenness can be further suppressed. In addition, it is possible to further prevent the ring-shaped light from being irradiated on the irradiation surface or to reduce the area of the irradiation surface.

The sealing portion 40 is formed from a material having a light transmitting property. The sealing section 40 can be formed from, for example, a transparent resin such as a silicone resin. In this case, it is preferable that the sealing portion 40 be formed from a methyl silicone resin. This is because methyl silicone resin has heat resistance and flexibility. In this case, the hardness of the methyl silicone resin is preferably about Shore A20 to A40.
The sealing section 40 can be formed, for example, by supplying a resin inside the frame section 30. The supply of the resin can be performed, for example, using a liquid metering device such as a dispenser.

(Manufacturing method of light emitting device 1)
Next, a method for manufacturing the light emitting device 1 will be described.
First, the light emitting elements 20y to 20b2 are mounted on the substrate 10 having the wiring pattern 12. At this time, the arrangement of the light emitting elements 20y to 20b2 is set as described above. In addition, since a known technique can be applied to mounting of the light emitting elements 20y to 20b2, detailed description is omitted.
Next, a frame 30 is provided so as to surround the light emitting elements 20y to 20b2. In this case, a frame-shaped frame portion 30 may be bonded to the substrate 10 or a resin may be applied to the substrate 10 in a frame shape and cured.

Next, a resin having a light-transmitting property is supplied inside the frame portion 30 to form the sealing portion 40.
The supply of the resin can be performed, for example, using a liquid metering device such as a dispenser. At this time, the shape of the light emitting surface 40a of the sealing portion 40 is controlled by adjusting the viscosity of the supplied resin. For example, by supplying a resin having a low viscosity, the light emitting surface 40a of the sealing portion 40 is made flat. For example, by supplying a resin having a high viscosity, the light emission surface 40a of the sealing portion 40 is formed to have a dome-shaped curved surface. The viscosity of the supplied resin can be determined, for example, by performing an experiment or a simulation in advance.
In addition, the diffusion portion 40b is formed by subjecting the light emitting surface 40a of the sealing portion 40 to blasting or chemical treatment, or pressing the mold material against the light emitting surface 40a when forming the sealing portion 40. .

Next, as necessary, a heat spreader is provided on the surface of the substrate 10 opposite to the side on which the light emitting elements 20y to 20b2 are provided.
As described above, the light emitting device 1 can be manufactured.

(Lighting device)
Next, an example of the lighting device 100 according to the present embodiment will be described.
FIG. 3 is a schematic cross-sectional view illustrating the lighting device 100 according to the present embodiment.
The lighting device 100 illustrated in FIG. 3 is a floodlight installed in a building, a stadium, or the like. Note that lighting device 100 according to the present embodiment is not limited to a light projector. The lighting device 100 may be any device that can emit full-color light.
As shown in FIG. 3, the illumination device 100 includes an irradiation unit 110 and a light source unit 120.

The irradiation unit 110 has a housing 111 and a reflector 112.
The housing 111 has a box shape. The housing 111 can be formed from, for example, an aluminum alloy. An end of the housing 111 opposite to the light source unit 120 is open. This opening is closed by a light-transmitting cover (not shown). A hole 111 a is provided at an end of the housing 111 on the light source unit 120 side.

  The reflector 112 is provided inside the housing 111. A flange 112a protruding outward is provided at an end of the reflector 112 opposite to the light source unit 120 side. The flange 112a is fixed to a mounting plate (not shown) provided on the inner wall of the housing 111.

  The reflector 112 can be a cylindrical body having both ends opened. The reflector 112 has a form in which the cross-sectional dimension gradually decreases toward the light source unit 120 side. The inner surface of the reflector 112 is a mirror surface. The end of the reflector 112 on the light source unit 120 side is provided inside the hole 111a. An end of the reflector 112 on the light source unit 120 side is provided at a position facing the light emitting device 1. Note that, for example, a hemispherical lens may be arranged on the light emission side of the light emitting device 1. In addition, the light emitting surface of the lens may be subjected to a diffusion process, or a diffusion sheet may be attached. If a diffusion process is performed or a diffusion sheet is attached, light emitted from the light emitting elements 20y to 20b2 can be diffused, so that the occurrence of color unevenness can be further suppressed.

The light source unit 120 includes the light emitting device 1, a housing 121, a mounting unit 122, a heat radiating unit 123, a packing 124, a heat radiating fin 125, and a heat pipe 126.
The housing 121 has a box shape. The housing 121 can be formed from, for example, an aluminum alloy. A hole is provided at an end of the housing 121 on the irradiation unit 110 side. The light emitting device 1 attached to the attachment portion 122 is provided inside the hole. That is, the light emitting device 1 is housed in the housing 121.

  The attachment portion 122 has a plate shape. The attachment section 122 can be formed from, for example, an aluminum alloy. The attachment section 122 is attached to the heat radiating section 123 using a fastening member such as a screw. A concave portion is provided on the end face of the mounting section 122 on the irradiation section 110 side. The light emitting device 1 is mounted inside the recess.

The heat radiation section 123 has a plate shape. The heat radiating section 123 can be formed, for example, of an aluminum alloy. The heat radiating section 123 is attached to the inside of the housing 121 using a fastening member such as a screw (not shown).
The packing 124 has an annular shape. The packing 124 is provided between the heat radiation part 123 and the inner wall surface of the housing 121.

  The radiation fin 125 has a thin plate shape. A plurality of radiation fins 125 are provided. The radiation fins 125 can be formed, for example, from an aluminum alloy. The radiating fins 125 are provided on the surface of the radiating portion 123 opposite to the side on which the mounting portion 122 is provided.

The heat pipe 126 is provided between the heat radiation part 123 and the heat radiation fin 125. A plurality of heat pipes 126 can be provided.
In addition, a control device (not shown) for controlling the light emitting device 1 can be provided. For example, the control device controls lighting and extinguishing for each of the light emitting elements 20y to 20b2. Further, the control device controls the power supplied to each of the light emitting elements 20y to 20b2, and controls the light emission output for each of the light emitting elements 20y to 20b2.

In addition, the light source unit 120 may further include a diffusion unit 127.
The diffusion unit 127 can be a plate-shaped body formed of, for example, glass or transparent resin. The diffusion portion 127 can have fine irregularities on the surface. There is no particular limitation on the size and shape of the unevenness, and it is sufficient that the light (light emitted from the light emitting device 1) incident on the diffusion unit 127 is diffused.
In addition, the unevenness can be provided in the entire area of the plate-like body, or can be provided in a predetermined area. The density of the unevenness may be constant or may be partially different.

  The irregularities can be formed, for example, by subjecting the surface of the plate to a blast treatment or a chemical treatment, or by pressing a mold material against the surface of the plate when forming the plate.

  Further, the diffusion section 127 may be, for example, a plate-like body including a diffusion material (for example, particles such as silicon oxide). However, when a plate-like body including a diffusing material is used, light extraction efficiency may be reduced. Therefore, it is more preferable that the diffusion portion 127 be a plate-like body having fine irregularities on the surface.

  By providing the diffusion unit 127, the light emitted from the light emitting elements 20y to 20b2 can be diffused, so that the occurrence of color unevenness can be further suppressed. In addition, it is possible to further prevent the ring-shaped light from being irradiated on the irradiation surface or to reduce the area of the irradiation surface.

  It should be noted that at least one of the diffusion unit 40b and the diffusion unit 127 described above can be provided. In this case, considering the light extraction efficiency, it is preferable that one of the diffusion unit 40b and the diffusion unit 127 be provided.

  While some embodiments of the present invention have been described above, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. These novel embodiments can be implemented in other various forms, and various omissions, replacements, changes, and the like can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and equivalents thereof. The above-described embodiments can be implemented in combination with each other.

  REFERENCE SIGNS LIST 1 light emitting device, 10 substrate, 11 base, 12 wiring pattern, 12a mounting pad, 12b wiring portion, 12c conductive via, 12d input terminal, 20y to 20b2 light emitting element, 30 frame portion, 40 sealing portion, 40a light emitting surface , 40b diffusion unit, 100 lighting device, 110 irradiation unit, 111 housing, 120 light source unit, 127 diffusion unit

Claims (3)

A light-emitting device that has a plurality of types of light-emitting elements that emit different colors of light and can emit light of four or more colors including two or more primary colors,
A substrate;
A plurality of first light emitting elements that are provided on the substrate and do not include a phosphor and emit red light;
The substrate is provided adjacent to the first light emitting element and does not include a phosphor. On the u'v 'chromaticity diagram, between the plurality of types of light emitting elements and the red color A plurality of second light emitting elements that emit blue or green light , the distance being the longest;
A diffuser that diffuses the red light emitted from the plurality of first light emitting elements and the blue light or green light emitted from the plurality of second light emitting elements;
With
On the substrate, the first light emitting element and the second light emitting element are adjacent to each other at two or more locations,
In the two or more portions, the red light and the blue or green light are diffused by one diffusion unit ,
A light emitting device in which the number of the first light emitting elements is larger than the number of the second light emitting elements . A light-emitting device that has a plurality of types of light-emitting elements that emit different colors of light and can emit light of four or more colors including two or more primary colors,
A substrate;
A plurality of first light emitting elements that are provided on the substrate and do not include a phosphor and emit green light;
The substrate is provided adjacent to the first light emitting element and does not include a phosphor. On the u'v 'chromaticity diagram, between the plurality of types of light emitting elements and the green color A plurality of second light-emitting elements that emit bluish light whose distance is the longest;
A diffusing unit that diffuses the green light emitted from the plurality of first light emitting elements and the blue light emitted from the plurality of second light emitting elements;
With
On the substrate, the first light emitting element and the second light emitting element are adjacent to each other at two or more locations,
In the two or more portions, the green light and the blue light are diffused by one diffusion unit ,
A light emitting device in which the number of the first light emitting elements is larger than the number of the second light emitting elements . A light-emitting device according to claim 1 or 2 ;
A housing in which the light emitting device is housed;
A lighting device comprising: