JP2021019078A - Light-emitting device - Google Patents

Abstract

To provide a light-emitting device capable of easily performing wiring to a plurality of light-emitting element groups obtained by conjugating light-emitting elements on the basis of luminous colors and capable of radiating light in a wide color gamut.SOLUTION: A light-emitting device includes a first light-emitting element group for emitting first white light, a second light-emitting element group for emitting second white light, and an auxiliary light-emitting section for emitting auxiliary white light on the green side from the first and second white light. The first and second light-emitting element groups are mounted in a first region 201, and the auxiliary light-emitting section is mounted on a second region 202 occupying an outer periphery section of the first region, first and second positive electrodes and first and second negative electrodes cross the second region so that the one end is arranged on a peripheral section of a substrate and the other end is arranged on an outer edge section of the first region. There are provided a first current path from the first positive electrode up to the first negative electrode through the first light-emitting element group, a second current path from the second positive electrode up to the second negative electrode through the second light-emitting element group, and a third current path from the third positive electrode up to the third negative electrode through the auxiliary light-emitting section.SELECTED DRAWING: Figure 1

Description

The present invention includes a substrate and a plurality of light emitting elements mounted on the substrate, and can independently drive a plurality of light emitting element groups in which the light emitting elements are aggregated based on the emission color to irradiate light in a wide color gamut. Regarding the light emitting device.

A COB (Chip On Board) type light emitting device in which a plurality of LED (Light-Emitting Diode) elements are mounted on a general-purpose substrate such as a ceramic substrate or a metal substrate is known. The white light emitted by such a light emitting device includes bluish and yellowish ones, which are represented by color temperature and greatly affect the atmosphere of the illumination space. In Japan, in general, a light emitting device that irradiates white light having a relatively high color temperature of about 5000 K is used for residential lighting, and a lower color temperature is used for lighting for restaurants and hotels to give a sense of quality. A light emitting device that irradiates white light is used. Further, the color temperature of the light emitted by the light emitting device is generally determined for each light emitting device, and a light emitting device that emits light having a desired color temperature is selected according to the intended use.

However, it may be convenient if one light emitting device can irradiate at different color temperatures depending on various conditions such as a time zone. For example, the LED light emitting module described in Patent Document 1 can irradiate white light having two different color temperatures. The LED light emitting module has a substrate, a transparent first dam material formed on the substrate, and an opaque second dam material arranged outside the first dam material. The plurality of LEDs arranged inside the first dam material (hereinafter referred to as "first region") are coated with a phosphor resin adjusted so that the first region emits light at 5000 K. A plurality of second LEDs arranged in an area (hereinafter referred to as "second area") set between the first dam material and the second dam material so that the second area emits light at 2700 K. It is coated with a fluorescent resin adjusted to.

The light emitting device described in Patent Document 1 can switch between the first white light emitted from the first region and the second white light emitted from the second region. Further, by lighting the first light emitting region and the second light emitting region at the same time and adjusting the light emission intensity of each, the coordinates of the first white light and the coordinates of the second white light on the chromaticity diagram can be obtained. It is possible to irradiate any white light on the line connecting the two. For example, if the first white light and the second white light are arranged on the blackbody radiation locus, any white light close to the blackbody radiation locus can be irradiated in the range of 2700K to 5000K.

JP-A-2016-119381

However, the light emitting device described in Patent Document 1 can only irradiate white light on a line connecting the coordinates of the first white light and the coordinates of the second white light on the chromaticity diagram. For example, even if the first white light and the second white light are arranged on the black body radiation locus, since the black body radiation locus is a curve, the black body other than the first white light and the second white light It is not possible to irradiate white light located on the radiation trajectory.

That is, the light emitting device described in Patent Document 1 has a problem that the color gamut that can be irradiated is narrow. As is well known, it is possible to expand the color gamut by adding an auxiliary light source that emits light at distant coordinates on the chromaticity diagram. However, Patent Document 1 does not show a means for efficiently arranging an auxiliary light source.

Therefore, the present invention includes a substrate and a plurality of light emitting elements mounted on the substrate, and when the light emitting elements are aggregated into a plurality of light emitting element groups based on the emission color, the wiring to each light emitting element group is provided. An object of the present invention is to provide a light emitting device capable of irradiating light having a wide color gamut easily.

The light emitting device according to one embodiment of the present invention includes a substrate, a first region occupying a central portion of the substrate, a second region occupying an outer peripheral portion of the first region, and a first region provided on the substrate. Positive electrode, second positive electrode, third positive electrode, first negative electrode, second negative electrode, third negative electrode, first light emitting element group that emits first white light, The first and second light emitting element groups include a second light emitting element group that emits a second white light and an auxiliary light emitting unit that emits an auxiliary white light on the green side of the first and second white light. , The auxiliary light emitting part is mounted in the second region, the first and second positive electrodes are arranged, and the first and second negative electrodes cross the second region, and one end is The peripheral portion and the other end of the substrate are arranged on the outer edge portion of the first region, and the first current path from the first positive electrode to the first negative electrode via the first light emitting element group and the second A second current path from the positive electrode to the second negative electrode via the second light emitting element group, and a third current path from the third positive electrode to the third negative electrode via the auxiliary light emitting portion. It is characterized by being prepared.

In the above light emitting device, it is preferable that the first light emitting element included in the first light emitting element group and the second light emitting element included in the second light emitting element group are arranged in a checkered pattern.

In the above light emitting device, the auxiliary light emitting unit preferably includes a third light emitting element group, a fourth light emitting element group, and a fifth light emitting element group having different light emitting colors.

In the above light emitting device, it is preferable that the third light emitting element group, the fourth light emitting element group, and the fifth light emitting element group emit light in red, green, and blue, respectively.

In the above light emitting device, it is preferable that the third light emitting element group, the fourth light emitting element group, and the fifth light emitting element group emit white light different from the first and second white light and different from each other. ..

In the above-mentioned light emitting device, in the third, fourth or fifth light emitting element group, at least two rows of third, fourth or fifth light emitting element rows in which the light emitting elements are connected in series are connected in parallel, and the third and third light emitting elements are connected in parallel. The fourth or fifth light emitting element sequence preferably surrounds the first region.

In the above light emitting device, it is preferable that the third, fourth or fifth light emitting element rows are arranged so as to be intertwined with each other.

The present invention can provide a light emitting device capable of irradiating light in a wide color gamut by easily wiring to a plurality of light emitting element groups in which light emitting elements are aggregated based on the light emitting color.

It is a top view which shows typically an example of the light emitting device which concerns on one Embodiment. It is sectional drawing which shows typically an example of the light emitting device which concerns on one Embodiment. It is a chromaticity diagram which shows an example of the color gamut of the white light which the light emitting device which concerns on one Embodiment irradiates. FIG. 5 is a cross-sectional view schematically showing an example of a light emitting device according to another embodiment, which is a first modification. It is a chromaticity diagram which shows another example of the color gamut of white light which a light emitting device irradiates. It is the 2nd modification, and is the top view which shows typically the light emitting device which concerns on other embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and can be appropriately modified without departing from the gist thereof. In addition, those having the same or equivalent functions in each figure may be designated by the same reference numerals, and the description thereof may be omitted or simplified. In addition, the matters specifying the invention shown in the claims are described in parentheses "()".

FIG. 1 is a top view schematically showing an example of a light emitting device 1 according to one embodiment. Further, FIG. 2 is a cross-sectional view schematically showing an example of the light emitting device 1 according to one embodiment. FIG. 2 shows a cross section of the light emitting device 1 shown in FIG. 1 along the VA-VA line. The light emitting device 1 is used for, for example, a floodlight, high ceiling lighting, stadium lighting, illumination, and the like.

The light emitting device 1 includes a substrate 2 and a plurality of light emitting elements 3 mounted on the substrate 2. The board 2 has a mounting board 20 and a circuit board 21. The substrate 2 may have a guide hole 24 for attaching the light emitting device 1 to another lighting fixture or the like.

The mounting substrate 20 is a flat substrate made of a metal having excellent heat resistance and heat dissipation such as aluminum or copper. For example, the mounting substrate 20 shown in FIGS. 1 and 2 has a square shape when viewed from above, and has a circular mounting region 200 in which the light emitting element 3 is mounted at the center thereof. The mounting area 200 is divided into a first area 201 and a second area 202 in order from the inside. Each of these regions does not necessarily have to have a circular shape as shown in FIG. 1, and the second region 202 may be arranged so as to surround the first region 201. Further, the mounting area 200 may be divided into three or more areas. The mounting board 20 also functions as a heat radiating plate for dissipating heat generated from the light emitting element 3 mounted on the mounting area 200.

The circuit board 21 is a flat printed circuit board formed of an insulating resin such as glass epoxy. For example, the circuit board 21 shown in FIGS. 1 and 2 has a square shape substantially the same as the mounting board 20 in a top view, and has a circular opening substantially the same as the mounting region 200 in the central portion thereof. The circuit board 21 has a pair of protrusions extending linearly toward the center of the opening and an annular portion extending along the boundary between the second region 202 and the first region 201 in the opening. .. Wiring 61A to 65A and 61B to 65B are provided on the protruding portion and the annular portion. The circuit board 21 is fixed on the mounting board 20 with, for example, an adhesive sheet or an adhesive.

The light emitting element 3 is an LED element that emits primary color light or white light. The primary color light is, for example, RGB (red, green, blue) or CMY (cyan, magenta, yellow) or the like. The method for obtaining white light may be an additive color mixture of three primary color lights or a complementary color mixture, and may be, for example, an additive color mixture of blue light and yellow light. Alternatively, the light emitting element 3 may emit primary color or white light using a phosphor. In this case, the light emitting element 3 uses an LED die that emits a primary color light having a short wavelength such as blue, absorbs all the light having the short wavelength into the phosphor, and causes the phosphor to have a long wavelength such as red, green, and yellow. The primary color may be emitted, or white emission may be made by color-mixing the emission of the LED die and the emission of the phosphor. The light emitting element 3 is fixed to the mounting region 200 of the mounting board 20 which is the light emitting surface of the light emitting device 1 with an insulating adhesive or the like so that the emitted light is emitted from the opening of the circuit board 21.

The light emitting element 3 arranged in the mounting region 200 shown in FIG. 1 is divided into five systems (light emitting element group) based on the light emitting color. The first and second light emitting elements 3 constituting the first and second systems are arranged in the first region 201 in the central portion of the mounting region 200 and are used as the main illumination. Further, the third to fifth light emitting elements 3 constituting the third to fifth systems are arranged in the second region 202 on the outer peripheral side in the mounting region 200, and are used as an auxiliary light emitting unit for auxiliary lighting.

The light emitting element 3 included in the first and second systems arranged in the first region 201 has a resin 80 at the upper part. The resin 80 contains a phosphor that absorbs the light emitted by the light emitting element 3 and emits light having a longer wavelength.

The first light emitting element 3 arranged in the first region 201 adds color to the blue light emitted by the LED die included in the first light emitting element 3 and the light having a large red component emitted by the first resin 80. The mixture is mixed and irradiated with the first white light W1. Similarly, the second light emitting element 3 arranged in the first region 201 adds the blue light emitted by the LED die included in the second light emitting element 3 and the yellow light emitted by the second resin 80. The mixture is mixed and irradiated with the second white light W2.

The third to fifth light emitting elements 3 arranged in the second region 202 emit a plurality of different primary color lights (R, G, B). That is, when the light emitted from the third to fifth light emitting elements 3 is added and mixed, the auxiliary white light W _RGB (see FIG. 3) is obtained. The auxiliary white light W _RGB has a higher color temperature than the first white light W1 and a lower color temperature than the second white light W2. The third to fifth light emitting elements 3 form an auxiliary light source unit.

The first white light W1 irradiated by the first light emitting element 3 is white light of about 2200 K having a low color temperature, and the second white light W2 irradiated by the second light emitting element 3 has a high color temperature. It is said to be white light of about 6500K. Further, the primary color light emitted by the third light emitting element 3 is red (R), the primary color light emitted by the fourth light emitting element 3 is green (B), and the fifth light emitting element 3 is irradiated. The primary color light to be used is blue (B). The auxiliary light source unit irradiates the auxiliary white light W _RGB (see FIG. 3) in which the three primary colors of red, green, and blue (RGB) are added and mixed. The light emitting element 3 that emits green light may be configured by combining an LED die that emits blue light and a resin containing a phosphor that absorbs blue light and emits green light. Further, the light emitting element 3 that emits red light may be configured by combining an LED die that emits blue light and a resin containing a phosphor that absorbs blue light and emits red light.

In the first to fifth light emitting element groups including the first to fifth light emitting elements 3, the first to fifth light emitting elements in which a predetermined number of light emitting elements 3 are connected in series with each other by a wire 4 made of gold or copper, respectively. The first to fifth light emitting element trains including the element trains are further connected in parallel. The first to fifth light emitting elements 3 may be connected in parallel, or these parallel circuits may be connected in series. In the first region 201 of FIG. 1, five rows of first light emitting elements composed of twelve first light emitting elements 3 are connected in parallel to form a first light emitting element group. Similarly, five rows of second light emitting elements composed of twelve second light emitting elements 3 are connected in parallel to form a second light emitting element group.

Further, in the second region 202, the third light emitting element row (R) formed by connecting 24 third light emitting elements 3 (R) in series is connected in parallel in two rows, and the third light emitting element row (R) is connected in parallel. It constitutes a group of light emitting elements. Similarly, a fourth light emitting element row (G) formed by connecting 24 fourth light emitting elements 3 (G) in series is connected in parallel in four rows to form a fourth light emitting element group. ing. Similarly, a fifth light emitting element row (B) formed by connecting 24 fifth light emitting elements 3 (B) in series is connected in two rows in parallel to form a fifth light emitting element group. ing. That is, in the second region 202, the third light emitting element row (R), the fourth light emitting element row (G), the fourth light emitting element row (G), and the fifth light emitting element are circularly formed from the inside. The row (B), the third light emitting element row (R), the fourth light emitting element row (G), the fourth light emitting element row (G), and the fifth light emitting element row (B) are arranged. Of these third to fifth light emitting element rows, half of the light emitting element rows are arranged in an arc shape on the left side in the second region 202, and the other half row is a circle on the right side in the second region 202. They are arranged in an arc.

A voltage value obtained by multiplying both ends of the first to fifth light emitting element rows by a predetermined number (direct number) of the voltage Vf for causing one light emitting element 3 included in each light emitting element row to emit light is applied to emit light. A current flows through the element 3, and the light emitting element 3 emits light.

The first and second light emitting elements 3 arranged in the first region 201 of FIG. 1 have a so-called checkered pattern arrangement (checker) in which the first light emitting element 3 and the second light emitting element 3 are interchanged in odd and even rows. Pattern). The first and second light emitting elements 3 are not limited to such an arrangement, and may be dispersedly arranged in the first region 201 so as to reduce uneven illumination. For example, a matrix. It may be arranged in a shape or a concentric circle.

As described above, the first and second light emitting elements 3 are arranged so that the light emitting elements 3 of the same system are not adjacent to each other. Therefore, the wire 4 connecting the first light emitting element 3 and the wire 4 connecting the second light emitting element 3 partially intersect in the first region 201. That is, although the wires 4 intersect, the first and second light emitting elements 3 are dispersedly arranged in the first region 201 in a checkered pattern, so that the illumination by the light emitting device 1 is homogenized and the unevenness of illumination is reduced. Will be done.

The electrodes 51A to 55A, 51B to 55B, and the wirings 61A to 65A, 61B to 65B are formed of a copper layer, a gold-plated layer, or the like on the circuit board 21. The electrodes 51A to 55A and 51B to 55B are a part of the first to fifth positive electrodes and the first to fifth negative electrodes, respectively. Further, the wirings 61A to 65A and 61B to 65B are the remaining parts of the first to fifth positive electrodes and the first to fifth negative electrodes, respectively.

The electrodes 51A to 55A and the wirings 61A to 65A apply a positive potential from an external power source (not shown) to one end (anode) of the first to fifth light emitting element trains. Further, the electrodes 51B to 55B and the wirings 61B to 65B apply a negative potential from an external power source to the other end (cathode) of the first to fifth light emitting element rows. The wires 61A to 65A are electrically connected to one end of the first to fifth light emitting element trains by the wire 4, and the wires 61B to 65B are respectively connected to the other end of the first to fifth light emitting element trains by the wire 4. Is electrically connected to.

As shown in FIG. 1, the electrodes 51A to 55A and 51B to 55B are provided at corners facing each other on the diagonal line of the circuit board 21. The electrodes 51A to 55A and the electrodes 51B to 55B are arranged so as to be point-symmetrical with respect to a predetermined symmetry point at the center of the opening of the circuit board 21. This simplifies the layout of the electrodes. The electrodes 51A to 55A and 51B to 55B are not limited to such an arrangement, and may be arranged in a peripheral portion other than the corner portion of the circuit board 21.

The wirings 61A to 65A and 61B to 65B shown in FIG. 1 are provided along the outer edge of the opening of the circuit board 21 (that is, the outer edge of the mounting area 200) and toward the center of the opening of the circuit board 21. It is also provided on a pair of linearly extending protrusions. Further, the wirings 61A to 62A and 61B to 62B are also present in the annular portion provided along the boundary between the second region 202 and the first region 201.

The light emitting element 3 emits light when a current is supplied from an external power source via the electrodes 51A to 55A and 51B to 55B and the wirings 61A to 65A and 61B to 65B. Each path from the electrodes 51A to 55A to the electrodes 51B to 55B via the wirings 61A to 65A, the first to fifth light emitting element groups, and the wirings 61B to 65B supplies a current to the first to fifth light emitting element groups. It constitutes the first to fifth current paths. The intensity of the light emitted by the first to fifth light emitting elements 3 is controlled for each of the first to fifth systems (light emitting element group) by adjusting the amount of current supplied to the first to fifth current paths. ..

The resin frame 70 is provided in an annular shape along the outer edge of the opening of the circuit board 21 to prevent the sealing resin 81 filling the mounting region 200 from flowing out. Further, the resin frame 70 is made of an opaque silicone resin or the like mixed with white particles and has reflexivity. The resin frame 70 reflects the light emitted laterally from the light emitting element 3 by the resin frame 70 and heads toward the front of the light emitting surface of the light emitting device 1, so that the illumination by the light emitting device 1 becomes bright.

As described above, the sealing resin 81 is filled in the space on the mounting region 200 surrounded by the resin frame 70, and seals and protects the first to fifth light emitting elements 3 arranged on the mounting region 200. .. At this time, the first to fifth light emitting elements 3 are sealed with the same sealing resin 81. That is, since it is not necessary to provide a resin frame for separating the first region 201 and the second region 202 in the mounting region 200, the degree of freedom in arranging the first to fifth light emitting elements 3 is improved. When it is desired to separate the sealing resin to be filled in the first region 201 and the sealing resin to be filled in the second region 202, the boundary between the first region 201 and the second region 202 is not shown. A resin frame is provided (the resin frame can be omitted if the tix property of the resin that seals the first region 201 is increased). The sealing resin 81 may contain a scattering material in order to uniformly disperse the light emitted by the light emitting element 3. Further, the sealing resin 81 may contain a phosphor that absorbs the light emitted by the light emitting element 3 and emits light having a longer wavelength. In the following description, it is assumed that the sealing resin 81 does not contain a phosphor.

The protection element 9 is a Zener diode, and when an overvoltage is applied to the light emitting element 3, a Zener current is passed to protect the light emitting element 3. The protection element 9 is connected in antiparallel to the first to fifth light emitting elements 3 between the wirings 61A to 65A and the wirings 61B to 65B via wires, respectively. Note that FIG. 1 shows only the protective element 9 that protects the first and second light emitting elements 3, but similarly, the protective elements 9 of the third to fifth light emitting elements 3 are the third to fifth, respectively. It is connected in anti-parallel to the light emitting element 3 of.

Hereinafter, a method for manufacturing the light emitting device 1 shown in FIG. 1 will be briefly described. First, the circuit board 21 provided with the electrodes 51A to 55A, 51B to 55B, and the wirings 61A to 65A, 61B to 65B is fixed on the mounting board 20. Next, the LED dies included in the first and second light emitting elements 3 are die-bonded to the first region 201 of the mounting substrate 20, and the LED dies included in the third to fifth light emitting elements 3 are die-bonded to the second region 202. Is die-bonded. Next, the first to fifth light emitting elements 3 and the first to fifth light emitting elements 3 and the wirings 61A to 65A and 61B to 65B are connected by the wire 4. Next, the first and second resins 80 containing the phosphor are applied to the upper part of the LED die arranged in the first region 201. Next, the resin frame 70 is formed along the outer edge of the second region 202, and the sealing resin 81 is filled in the first and second regions 201 and 202 surrounded by the resin frame 70. At this time, the first to fifth light emitting elements 3 are sealed. Through the above steps, the light emitting device 1 shown in FIG. 1 is manufactured.

FIG. 3 is a chromaticity diagram drawn by simplifying the CIE 1931 chromaticity diagram, and shows the color gamut of white light emitted by the light emitting device 1 according to one embodiment. On the chromaticity diagram of FIG. 3, the blackbody radiation locus 30, the first and second white lights W1, W2, the emission colors R, G, and B of the third to fifth light emitting element groups, and the third to fifth. Auxiliary white light W _RGB , which is obtained by color-mixing the light emission of the light emitting element group of the above, is shown. The eight rectangular regions covering the blackbody radiation trajectory 30 represent color temperature regions that indicate the rank of the LED as defined by ANSI (American National Standards Institute). Each of the eight color temperature regions is represented by 2700K, 3000K, 3500K, 4000K, 4500K, 5000K, 5700K, 6500K, depending on the color temperature of the center.

The first light emitting element 3 emits light with the first white light W1 (outside the rectangular region showing 2700K) having a color temperature of 2200K on the blackbody radiation locus 30 on the chromaticity diagram shown in FIG. The second light emitting element 3 emits light with the second white light W2 (the central portion of the rectangular region showing 6500K) having a color temperature of 6500K on the blackbody radiation locus 30 on the chromaticity diagram shown in FIG.

As described above, the intensity of the first white light W1 irradiated by the first light emitting element group and the intensity of the second white light W2 irradiated by the second light emitting element group are the electrodes 51A to 52A and 51B. By adjusting the amount of current supplied to ~ 52B, each is controlled independently. That is, the light emitting device 1 adds and mixes the first white light W1 irradiated by the first light emitting element group and the second white light W2 irradiated by the second light emitting element group on the chromaticity diagram. It is possible to irradiate any white light on the line connecting the coordinates of the first white light W1 and the coordinates of the second white light W2.

The light emitting device 1 includes a third to fifth light emitting element group (third to fifth system) in addition to the first and second light emitting element groups (first and second systems). The third light emitting element group, the fourth light emitting element group, and the fifth light emitting element group arranged in the second region 202 are the first primary color light, the second primary color light, and the third primary color light, respectively. Emit. These first primary color light, second primary color light, and third primary color light are red light (R), green light (G), and blue light (B), respectively. The intensities of the first to third primary color lights emitted by the third to fifth light emitting element groups are independently controlled by adjusting the amount of current supplied to the electrodes 53A to 55A and 53B to 55B. That is, the auxiliary light emitting unit composed of the third to fifth light emitting elements groups adds and mixes the first to third primary color lights, and the RGB (red, green, blue) primary color light on the chromaticity diagram of FIG. 3 is added. Light at any coordinate in the triangle whose apex is the coordinate of can be irradiated as auxiliary white light W _RGB .

When the auxiliary light emitting unit irradiates the auxiliary white light W _RGB shown on the chromaticity diagram of FIG. 3, the light emitting device 1 has a first white light W1, a second white light W2, and an auxiliary white light W _RGB. When adding and mixing with and, the intensity of each can be adjusted, and light can be emitted at any chromaticity within the triangle whose apex is these coordinates. As a result, the light emitting device 1 can irradiate light having a wide color gamut.

The quality of white light is different between the first and second white lights W1 and W2 and the auxiliary white light W _RGB . That is, since the first and second white lights W1 and W2 include the light emitted by the phosphor of the resin 80, they have a continuous spectrum in a wide wavelength range. On the other hand, the auxiliary white light W _RGB emitted by the auxiliary light emitting unit is white light obtained by adding and mixing the primary color light emitted by the LED die, and therefore consists of three line spectra having a narrow wavelength range. Therefore, the light emitting device 1 is high at a desired color temperature by simultaneously irradiating the white light obtained by adding and mixing the first and second white lights W1 and W2 and the auxiliary white light W _RGB. Color rendering properties can be ensured.

In addition to being composed of three light emitting element groups, the auxiliary light emitting unit may be composed of four or more light emitting element groups, or may be composed of one or two light emitting element groups. For example, in the case of two systems, the auxiliary light emitting unit may irradiate the light emitting color of the third light emitting element group as blue and the light emitting color of the fourth light emitting element group as yellow.

As described above, the light emitting device 1 includes a first region 201 occupying the central portion of the substrate 2 and a second region 202 occupying the outer peripheral portion of the first region 201. On the substrate 2, the electrode 51A and the wiring 61A (first positive electrode), the electrode 52A and the wiring 62A (the second positive electrode), the electrode 53 and the wiring 63A (the third positive electrode), the electrode 51B and the wiring 61B ( (First negative electrode), electrode 52B and wiring 62B (second negative electrode), electrode 53B and wiring 63B (third negative electrode) are formed. In the first region 201, a first light emitting element group that emits the first white light W1 and a second light emitting element group that emits the second white light W2 are mounted, and in the second light emitting region, the first light emitting element group is mounted. An auxiliary light emitting unit that emits auxiliary white light W _RGB on the green side of the white lights W1 and W2 of ~ 2 is mounted.

At this time, the wirings 61A, 62A, 61B, 62B are connected to the electrodes 51A, 52A, 51B, 52B at the corners of the substrate 2, cross the second region 202, and end at the outer edge of the first region 201. The unit is arranged, and the end portion is connected to the first and second light emitting element groups. That is, a current path from the electrode 51A to the electrode 51B via the wiring 61A, the first light emitting element group, and the wiring 61B is completed. Similarly, a current path from the electrode 52A to the electrode 52B via the wiring 62A, the second light emitting element group, and the wiring 62B is completed. Further, the wirings 63A and 63B are connected to the electrodes 53A and 53B at the corners of the substrate 2 and include an end portion arranged so as to cross the second region 202, and this end portion is included in the auxiliary light emitting portion. It is connected to a third light emitting element group. That is, a current path from the electrode 53A to the electrode 53B via the wiring 63A, the third light emitting element group, and the wiring 63B is completed (the same applies to the fourth to fifth light emitting element groups).

Therefore, the light emitting device 1 arranges the first and second light emitting element groups, which are the main light emitting parts, in the central portion of the substrate, and provides auxiliary light emitting units (third to fifth light emitting element groups) for finely adjusting the light emitting color. Wiring is simplified by arranging it on the outer periphery of the main light emitting part. Further, since the light emitting device 1 obtains a desired light emitting color by synthesizing the first white light W1, the second white light W2, and the auxiliary white light W _RGB , the color gamut of the light emitting color can be widened. it can.

Further, in the light emitting device 1, the light emitting elements 3 included in the first light emitting element group and the light emitting elements 3 included in the second light emitting element group are arranged in a checkered pattern. As a result, in the main light emitting unit (first region 201), the color mixing property of the white light W1 of the first light emitting element group and the white light W2 of the second light emitting element group is improved.

Further, 24 light emitting elements 3 are connected in series in the third light emitting element group (R), the fourth light emitting element group (G), and the fifth light emitting element group (B) included in the auxiliary light emitting unit. The third to fifth light emitting element rows are connected in parallel in 2, 4, and two rows, respectively, and symmetrically surround the main light emitting portion (first region 201). As a result, the balance related to the fine adjustment of the emitted color is improved.

It should be noted that the above-described embodiments merely show examples of embodiment in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

FIG. 4 is a cross-sectional view schematically showing a light emitting device 1a according to another embodiment, which is a first modification. FIG. 4 shows another example of the cross section of the light emitting device 1 shown in FIG. 1 along the VA-VA line.

The third to fifth light emitting elements 3 included in the third to fifth light emitting element groups arranged in the second region 202 of the light emitting device 1a shown in FIG. 4 are the light emitted by the LED die included in each light emitting element 3. A third to fifth resin 80 containing a phosphor that absorbs light and emits light having a longer wavelength is provided on the upper portion thereof. With the third to fifth resins 80, the third to fifth light emitting element groups irradiate white light W3, W4, W5 (see FIG. 5). Since the light emitting device 1a is the same as the light emitting device 1 shown in FIG. 2, the other points will be mainly described.

For example, in the fourth light emitting element group arranged in the second region 202, the blue light emitted by the LED die included in the fourth light emitting element 3 and the yellow light emitted by the fourth resin 80 are added. The mixture is mixed and irradiated with a fourth white light W4 (see FIG. 5). Similarly, the third and fifth light emitting element groups are composed of the blue light emitted by the LED dies included in the third and fifth light emitting elements 3 and the red and blue components emitted by the third and fifth resins 80. A large amount of light is added and mixed to irradiate the third and fifth white lights W3 and W5 (see FIG. 5).

FIG. 5 is a chromaticity diagram showing an example of the color gamut of white light emitted by the light emitting device 1a. The first light emitting element group and the second light emitting element group emit the first white light W1 and the second white light W2 on the blackbody radiation locus 30 on the chromaticity diagram, as in FIG. On the other hand, the third to fifth light emitting element groups are the third white light W3 and the fourth white light W3 on the green side (the positive direction side of the y-axis in the figure) from the blackbody radiation locus 30 on the chromaticity diagram of FIG. It emits white light W4 and a fifth white light W5. The color temperatures of the third to fifth white lights W3, W4, and W5 are higher than the first white light W1 and lower than the second white light W2, and are approximately 3000K, 4000K, and 5000K, respectively. In addition to these color temperatures, the color temperatures of the third to fifth white lights W3 to W5 may be selected from eight color temperature ranges defined by the ANSI (American National Standards Institute) standard.

The intensities of the third to fifth white lights W3 to W5 are independently controlled by adjusting the amount of current supplied to the electrodes 53A to 55A and 53B to 55B. As a result, the light emitting device 1a adds and mixes the first to fifth white lights W1 to W5 irradiated by the first to fifth light emitting element groups, and the first to fifth whites shown in the chromaticity diagram of FIG. Any white light can be irradiated in the pentagon whose apex is the coordinates of the lights W1 to W5. As a result, the light emitting device 1 can irradiate light in a wide color gamut that roughly covers the eight color temperature regions defined by ANSI (American National Standards Institute).

In this modified example, the auxiliary light emitting unit obtained auxiliary white light by color-mixing the third to fifth white lights W1, W2, and W3 emitted by the third to fifth light emitting element groups. However, in addition to being composed of three light emitting element groups, the auxiliary light emitting unit may be composed of four or more light emitting element groups, or may be composed of one or two light emitting element groups.

FIG. 6 is a top view schematically showing a light emitting device 1b according to another embodiment, which is a second modification. The light emitting device 1b shown in FIG. 6 has an arrangement of the light emitting elements 3 included in the third to fifth light emitting element groups arranged in the second region 202 and the arrangement of the light emitting elements 3 and the wires 4 as compared with the light emitting device 1 shown in FIG. Wiring is different. Other than that, since the light emitting device 1b is the same as the light emitting device 1 shown in FIG. 1, the points different from those of FIG. 1 will be mainly described.

Each of the third to fifth light emitting elements groups is configured by electrically connecting a predetermined number of light emitting elements 3 in series with each other by a wire 4 made of gold or copper. In the second region 202 shown in FIG. 6, four rows of third to fifth light emitting elements composed of 24 light emitting elements 3 are arranged in parallel. Of these third to fifth light emitting element trains, half are arranged in an arc shape on the left side in the second region 202, and the other half are arranged in an arc shape on the right side in the second region 202. .. The number of the third to fifth light emitting element rows may be different from each other. For example, when the third to fifth light emitting element groups irradiate each of the red (R), green (B), and blue (B) primary color lights, they are included in the fourth light emitting element group that irradiates the green primary color light. The number of the fourth light emitting element trains may be twice as many as the third and fifth light emitting element trains that irradiate the primary color light of red or blue.

The light emitting element 3 included in the third to fifth light emitting element groups includes a wire 4 for connecting the light emitting elements 3 included in the third light emitting element group to each other and a light emitting element 3 included in the fourth light emitting element group to each other. The wires 4 to be connected and the wires 4 to connect the light emitting elements 3 included in the fifth light emitting element group to each other are arranged so as to intersect each other in the second region 202. That is, the third to fifth light emitting element sequences are intertwined. As a result, the light emitting elements 3 included in the third to fifth light emitting element groups are dispersedly arranged in the second region 202, so that the illumination by the auxiliary light emitting unit of the light emitting device 1b is homogenized. Such wiring of the wire 4 may have a configuration in which the third to fifth light emitting elements 3 irradiate the primary color light of red (R), green (B), and blue (B), or the third to fifth light emitting elements 3. The same can be applied even if the light emitting element 3 of the above is configured to irradiate the third to fifth white lights W3, W4, and W5.

1, 1a, 1b Light emitting device 2 Board 3 Light emitting element 4 Wire 9 Protective element 20 Mounting board 21 Circuit board 51A to 55A, 51B to 55B Electrodes (first to third positive electrodes, negative electrodes)
61A to 65A, 61B to 65B wiring (first to third positive electrodes, negative electrodes)
70 Resin frame 80 Resin 81 Encapsulating resin 200 Mounting area 201 First area 202 Second area

Claims (7)

With the board
A first region occupying the central portion of the substrate and
A second region occupying the outer peripheral portion of the first region and
A first positive electrode, a second positive electrode, a third positive electrode, a first negative electrode, a second negative electrode, and a third negative electrode provided on the substrate.
A first group of light emitting elements that emit a first white light,
A second group of light emitting elements that emit a second white light,
An auxiliary light emitting unit that emits auxiliary white light on the green side of the first and second white lights,
With
The first and second light emitting elements are mounted in the first region.
The auxiliary light emitting unit is mounted in the second region.
The first and second positive electrodes and the first and second negative electrodes cross the second region, and one end is arranged at the peripheral portion of the substrate and the other end is arranged at the outer edge portion of the first region. Being done
A first current path from the first positive electrode to the first negative electrode via the first light emitting element group, and
A second current path from the second positive electrode to the second negative electrode via the second light emitting element group, and
A third current path from the third positive electrode to the third negative electrode via the auxiliary light emitting portion, and
A light emitting device equipped with. The first light emitting element included in the first light emitting element group and the second light emitting element included in the second light emitting element group are arranged in a checkered pattern.
The light emitting device according to claim 1. The auxiliary light emitting unit includes a third light emitting element group, a fourth light emitting element group, and a fifth light emitting element group having different emission colors from each other.
The light emitting device according to claim 1 or 2. The third light emitting element group, the fourth light emitting element group, and the fifth light emitting element group emit light in red, green, and blue, respectively.
The light emitting device according to claim 3. The third light emitting element group, the fourth light emitting element group, and the fifth light emitting element group emit white light different from the first and second white light and different from each other.
The light emitting device according to claim 3. In the third, fourth or fifth light emitting element group, at least two rows of third, fourth or fifth light emitting element rows in which the light emitting elements are connected in series are connected in parallel.
The third, fourth, or fifth light emitting element sequence surrounds the first region.
The light emitting device according to any one of claims 3 to 5. The third, fourth, or fifth light emitting element trains are arranged so as to be intertwined with each other.
The light emitting device according to claim 6.

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