JP2018093151A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device where a plurality of light-emitting sections having a plurality of light-emitting regions that emit light in mutually different colors are formed on a common substrate, which improves color mixing properties of light from each of the light emitting sections.SOLUTION: A light-emitting device (2) has a substrate (10) and a plurality of light-emitting sections (20) formed on the upper surface of the substrate, where each of the plurality of light-emitting sections has a plurality of light-emitting regions (21R, 21G, 21B and 21A) that emit light in mutually different colors, each of the plurality of light-emitting regions has a plurality of light-emitting elements (31 to 34) mounted on the substrate and sealing resins (23R, 23G, 23B and 23A) which are packed on the substrate and seal the plurality of light-emitting elements, and arrangement angles of the plurality of light-emitting regions in the upper surface with respect to a reference direction in the upper surface of the substrate are different depending on the light-emitting sections.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a light emitting device.

  2. Description of the Related Art A COB (Chip On Board) light emitting device in which an LED (light emitting diode) element is mounted on a substrate and the LED element is sealed with a translucent resin containing a phosphor is known. Among such light emitting devices, there are devices in which a light emitting region is divided into a plurality of partial regions by a dam material, and each partial region emits light in a different color (see, for example, Patent Documents 1 to 3).

JP 2008-235680 A JP 2011-049516 A JP 2011-108744 A

  In order to increase the amount of emitted light and generate light of various colors, a plurality of light emitting portions are formed on one common substrate, and each light emitting portion is divided into a plurality of light emitting regions that emit light of different colors. Consider manufacturing a light emitting device. In such a light-emitting device, depending on the arrangement of the light-emitting areas on the common substrate, there is a possibility that the color unevenness of the emitted light may be noticeable when the light-emitting areas are collectively emitted.

  Accordingly, an object of the present invention is to improve the color mixing property of light from each light emitting unit in a light emitting device in which a plurality of light emitting units each having a plurality of light emitting regions emitting different colors are formed on a common substrate. It is.

  A substrate and a plurality of light emitting units formed on the upper surface of the substrate, each of the plurality of light emitting units has a plurality of light emitting regions that emit light in different colors, and each of the plurality of light emitting regions is a substrate A plurality of light emitting elements mounted on the substrate and a sealing resin which is filled on the substrate and seals the plurality of light emitting elements, and an arrangement angle of the plurality of light emitting regions in the upper surface with respect to a reference direction in the upper surface of the substrate is There is provided a light emitting device that is different for each light emitting unit.

  In the above light emitting device, the shape of the plurality of light emitting regions in each light emitting unit is rotationally symmetric with respect to the center of the light emitting unit, and the number of the plurality of light emitting regions of one light emitting unit is n, Are preferably different by an integral multiple of 360 degrees / n.

  In the above light emitting device, each of the plurality of light emitting portions is formed on the substrate and corresponds to each of the plurality of light emitting regions of the light emitting portion, and all the light emission of the light emitting portion formed on the substrate. It is preferable to have a common electrode common to the regions, and the plurality of light emitting regions in each light emitting unit can emit light independently of each other.

  In the above light-emitting device, each of the plurality of light-emitting portions preferably further includes a dam material that serves as a boundary between the light-emitting regions, and the common electrode is preferably formed so as to pass under the dam material on the substrate. .

  In the above light emitting device, in each light emitting part, n individual electrodes and a part of the common electrode of the light emitting part are exposed on the substrate as inspection terminals for a plurality of light emitting areas of the light emitting part. Is preferred.

  In the above light-emitting device, each of the plurality of light-emitting portions preferably has three light-emitting regions that emit red, green, and blue, and the arrangement angles are preferably three types of 0 degree, 120 degrees, and 240 degrees. Alternatively, each of the plurality of light emitting units has three light emitting regions that emit red, green, and blue light, and another light emitting region having a light emission wavelength different from the three light emitting regions, and the arrangement angle is 0 degree, 90 degrees. It is preferable that the angle is 180 degrees and 270 degrees.

  In the above light emitting device, it is preferable that the light emitting elements having different mounting angles within the upper surface with respect to the reference direction in each light emitting unit are arranged symmetrically with respect to a straight line passing through the center of the light emitting unit. Moreover, in each light emitting part, it is preferable that the plurality of light emitting elements in the plurality of light emitting regions are arranged symmetrically with respect to a straight line passing through the center of the light emitting part in the upper surface.

  ADVANTAGE OF THE INVENTION According to this invention, in the light-emitting device with which the light emission part which has several light emission area | regions light-emitted in a mutually different color was formed on the common board | substrate, it is possible to improve the color mixing property of the light from each light emission part. It is.

1 is a front view of a lighting device 1. FIG. It is the upper side figure and side view of the light-emitting device 2. 3 is a top view of the lens array 40. FIG. 4 is a top view of the light emitting device 2 excluding the lens array 40. FIG. 3 is a top view and a cross-sectional view of a light emitting unit 20 in the light emitting device 2. FIG. 3 is a plan view showing an electrode pattern on a substrate 10. FIG. It is a top view of another light-emitting device 2a. It is a top view of the light emission part 20a in the light-emitting device 2a. It is a figure which shows the modification of arrangement | positioning of the LED elements 31-33 in the light emission part 20a. It is a top view of another light emitting device 2b.

  Hereinafter, the light emitting device will be described with reference to the drawings. However, it should be understood that the present invention is not limited to the drawings or the embodiments described below.

  FIG. 1 is a front view of the lighting device 1. The illuminating device 1 is a device that can be used as, for example, a floodlight for illumination. As an example, as shown in FIG. 1, a housing 3 and four light emitting devices 2 arranged on an elliptical light emitting surface thereof. And have. The light emitting surface of the illumination device 1 and the light emitting device 2 are not limited to the elliptical shape shown in the figure, but may be other shapes such as a rectangle, and the number of the light emitting devices 2 may be other than four. Moreover, the illuminating device 1 has a heat sink (for example, a heat radiating fin) for promoting release of heat generated in the light emitting device 2 on the back surface side opposite to the illustrated light emitting surface. Although not shown, an appropriate spacer may be disposed between the light emitting device 2 and the heat sink.

  2A and 2B are a top view and a side view of the light-emitting device 2, respectively. The light emitting device 2 includes a substrate 10, a plurality of light emitting units 20 formed on the upper surface of the substrate 10, and a lens array 40 disposed on the plurality of light emitting units 20. As will be described later, the lens array 40 has eight lenses, and reference numeral 41 denotes these lenses.

  The substrate 10 is an insulating substrate made of ceramics, for example, and has an elliptical shape in which the lengths of the major axis and the minor axis are about 20 cm and about 10 cm, respectively. The substrate 10 is fixed to the housing 3 of the light emitting device 2 shown in FIG.

  A plurality of light emitting units 20 are formed on the substrate 10 which is a common substrate at intervals, and each of the light emitting units 20 is independent and is evenly arranged along the outer periphery of the elliptical substrate 10. As will be described later, each light emitting unit 20 has a plurality of LED elements, and each light emitting unit 20 forms one element group. In the illustrated example, the light emitting device 2 includes eight light emitting units 20, but the number of the light emitting units 20 in the light emitting device is not particularly limited, and the arrangement thereof may be different from the illustrated one.

  FIG. 3 is a top view of the lens array 40. The lens array 40 is an assembly of lenses in which a plurality of lenses 41 are integrally formed. In the illustrated example, the lens array 40 includes eight lenses 41 that are the same as the number of the light emitting units 20 in the light emitting device 2. The end of the lens array 40 is fixed to the housing 3 of the light emitting device 2 shown in FIG. As shown in FIG. 2B, the optical axis Z of each lens 41 coincides with the normal direction of the substrate 10. Each lens 41 is provided in the same arrangement as the light emitting unit 20 on the substrate 10 corresponding to each light emitting unit 20, and has, for example, the same shape and size. Each lens 41 is designed so that the emitted light from the corresponding light emitting unit 20 is condensed and the emitted light from the plurality of light emitting units 20 is overlapped and irradiated at a position sufficiently away from the substrate 10. .

FIG. 4 is a top view of the light emitting device 2 excluding the lens array 40. In FIG. 4, for the sake of convenience, the light emitting unit 20 arranged at the upper center of the figure is referred to as “light emitting unit 20 ₁ ”, and each light emitting unit 20 is indicated as “light emitting units 20 _{2 to} 20 ₈ ” clockwise from there. ing. A small circle indicated by reference numeral 16 is a screw hole for fixing the substrate 10 to the housing 3, and a square indicated by reference numeral 17 is a through hole of the substrate 10.

  5A and 5B are a top view and a cross-sectional view of the light emitting unit 20, respectively. FIG. 5B shows a cut surface of the light emitting unit 20 along the line VB-VB in FIG. All of the eight light emitting units 20 in the light emitting device 2 have the same configuration, and in FIG. 5A and FIG. 5B, one of them is shown enlarged. Each light emitting unit 20 has four light emitting regions 21R, 21G, 21B, and 21A (see FIG. 4) that emit light in different colors. As the components of these light emitting regions, a dam material 22 and a sealing resin 23R, 23G, 23B, 23A and LED elements 31-34.

  As shown in FIG. 4 and FIG. 5 (A), the four regions divided by the dam material 22 and covered with the sealing resins 23R, 23G, 23B, and 23A are divided into light emitting regions 21R, 21G, 21B, and 21A, respectively. Equivalent to. Each of the light emitting regions 21R, 21G, 21B, and 21A has a fan shape with a central angle of 90 degrees, and one circular light emitting region is configured by these fan shapes. The light emitting area 21R emits red (R), the light emitting area 21G emits green (G), the light emitting area 21B emits blue (B), and the light emitting area 21A emits amber (A). As will be described below, the substrate 10 is provided with electrodes respectively corresponding to these light emitting regions, and the four light emitting regions of each light emitting unit 20 can emit light independently of each other. For this reason, the light emitting device 2 can emit light for each color, and white light can be obtained by emitting all four colors. In addition, the overall emission color can be adjusted by adjusting the current flowing through each light emitting region.

  The dam material 22 serves as a boundary between the light emitting regions 21R, 21G, 21B, and 21A and is a frame for preventing the sealing resins 23R, 23G, 23B, and 23A from flowing out. The dam material 22 is made of, for example, white resin, and is fixed to the upper surface of the substrate 10. The dam material 22 has an annular portion that is a boundary on the outer peripheral side of the light emitting portion 20 and two straight portions that divide the circle into four equal parts through the center of the circle, and is mounted on the substrate 10. The LED elements 31 to 34 are surrounded. The lengths of the two straight portions are both the same as the diameter of the circle. The dam material 22 has a reflective coating on the surface thereof, for example, so that the light emitted from the LED elements 31 to 34 to the side is seen above the light emitting unit 20 (as viewed from the LED elements 31 to 34). The light is reflected toward the opposite side of the substrate 10. In FIG. 5A, the dam material 22 is illustrated as being transparent.

  The LED elements 31 to 34 are an example of a light emitting element, and are, for example, blue LEDs that are made of a gallium nitride compound semiconductor and emit blue light having an emission wavelength band of about 450 to 460 nm. The LED elements 31 to 34 are mounted in regions on the substrate 10 corresponding to the light emitting regions 21R, 21G, 21B, and 21A, with the light emitting surface facing away from the substrate 10, respectively. In the illustrated example, 20 LED elements 31 are provided in the light emitting area 21R, 20 LED elements 32 are provided in the light emitting area 21G, 20 LED elements 33 are provided in the light emitting area 21B, and 20 LED elements are provided in the light emitting area 21A. 34 are respectively mounted. The lower surfaces of the LED elements 31 to 34 are fixed to the upper surface of the substrate 10 with, for example, a transparent insulating adhesive.

  The LED elements 31 to 34 have a pair of element electrodes on the upper surface, and as shown in FIG. 5B, the element electrodes of the adjacent LED elements 31 to 34 are bonded by bonding wires 35 (hereinafter simply referred to as wires 35). They are electrically connected to each other. The LED elements 31 to 34 are connected in series in one row (20 stages) in each light emitting unit 20. However, the LED elements 31 to 34 in each light emitting unit 20 may be connected in series and parallel, respectively. For example, five LED elements 31 to 34 in each light emitting unit 20 may be connected in series, and the four sets may be further connected in parallel to the wiring pattern on the substrate 10. Thereby, a current is supplied to the LED elements 31 to 34 via the wires 35. In FIG. 5A, the wire 35 is not shown for simplicity.

  The number of LED elements 31 to 34 in each light emitting unit 20 is not particularly limited, and each light emitting unit 20 may have a larger number of LED elements 31 to 34 in order to obtain a high light amount. Further, the number of LED elements 31 to 34 included in one light emitting unit 20 may be the same for all the light emitting units 20 or may be different for each light emitting unit 20. The number of LED elements 31 to 34 in each light emitting unit 20 in series and the number in parallel may be the same in all the light emitting units 20 and the light emitting regions 21R, 21G, 21B, and 21A, or may be different for each light emitting unit or light emitting region. Good.

  In FIG. 5A, the LED elements 31 to 34 are indicated by a white square and a black square. The LED elements 31 to 34 indicated by squares of the same color all have the same arrangement direction of the element electrodes of the LED elements. On the other hand, the LED elements 31 to 34 indicated by white squares and the LED elements 31 to 34 indicated by black squares are shifted by 90 degrees in the arrangement direction of the element electrodes of the LED elements. That is, the LED elements 31 to 34 indicated by white squares are mounted on the substrate 10 by being rotated 90 degrees with respect to the LED elements 31 to 34 indicated by black squares. In FIG. 5A, the distribution of the white squares and the black squares is line symmetric with respect to a straight line Y in the vertical direction in the drawing that passes through the center of the light emitting unit 20. In other words, in each light emitting unit 20, the LED elements 31 to 34 having different mounting angles within the upper surface of the substrate 10 with respect to a reference direction (for example, the major axis direction or the minor axis direction of the ellipse) on the substrate 10 are linear Y Is distributed symmetrically with respect to.

  Further, as shown in FIG. 5A, the LED elements 31 to 34 of each light emitting unit 20 are two straight lines passing through the center of the straight portion of the dam material 22, that is, the upper surface of the substrate 10 passing through the center of the light emitting unit 20. Are arranged symmetrically with respect to two straight lines X and Y orthogonal to each other. Further, in the light emitting unit 20, the arrangement of the LED elements 31 to 34 is also 90 degree rotationally symmetric with respect to the center of the light emitting unit 20. As described above, the arrangement of the LED elements 31 to 34 of each light emitting unit 20 and the distribution of the mounting angles have symmetry, so that the mounting process of the LED elements 31 to 34 at the time of manufacturing the light emitting device 2 is facilitated.

  The sealing resins 23R, 23G, 23B, and 23A are filled in the regions surrounded by the dam material 22 on the substrate 10, respectively, and the LED elements 31 to 34 and the wires 35 in the corresponding light emitting regions 21R, 21G, 21B, and 21A are filled. Are entirely covered and protected (sealed). As the sealing resin 23R, 23G, 23B, 23A, for example, a colorless and transparent resin such as an epoxy resin or a silicone resin, particularly a resin having a heat resistance of about 250 ° C. may be used.

The sealing resin 23R contains, for example, a red phosphor such as CaAlSiN ₃ : Eu ²⁺ that absorbs blue light from the LED element 31 and emits red light. Thereby, the light emitting region 21 </ b> R emits red light in a wavelength region of, for example, 620 to 750 nm. The sealing resin 23G contains, for example, a green phosphor such as (BaSr) ₂ SiO ₄ : Eu ²⁺ that absorbs blue light from the LED element 32 and emits green light. Thereby, the light emitting region 21G emits green light having a wavelength range of 500 to 570 nm, for example.

  The sealing resin 23B is a sealing resin for the light emitting region 21G that emits blue light. Since the LED element 33 is a blue LED, the sealing resin 23B may be a transparent resin containing no phosphor. The light emitting region 21B emits blue light having a wavelength range of 450 to 490 nm, for example.

  The sealing resin 23A is a sealing resin for the light emitting region 21A that emits amber light. Since the amber color wavelength region extends over the yellow long wavelength region and the yellow red short wavelength region, the sealing resin 23A contains, for example, a yellow phosphor and a red phosphor. The yellow phosphor is, for example, a phosphor such as YAG (Yttrium Aluminum Garnet) that absorbs blue light from the LED element 34 and emits yellow light. Accordingly, the light emitting region 21A emits amber light in a wavelength range of, for example, 580 to 600 nm. Note that the sealing resin 23A may contain one type of amber fluorescent material or two types of green fluorescent material and red fluorescent material instead of the yellow fluorescent material and the red fluorescent material. Any one of the above-described three methods can realize amber light emission.

  Note that one sealing resin may contain a plurality of types of phosphors, and the sealing resins 23R, 23G, 23B, and 23A may contain different types of phosphors for each light emitting unit 20.

  FIG. 6 is a plan view showing an electrode pattern on the substrate 10. Each light emitting unit 20 has four individual electrodes 11R, 11G, 11B, and 11A and a common electrode 12, which are formed on the upper surface of the substrate 10.

  The individual electrodes 11R, 11G, 11B, and 11A are provided corresponding to the light emitting regions 21R, 21G, 21B, and 21A, respectively. The individual electrodes 11R, 11G, 11B, and 11A are formed from the rectangular through-holes 17 in the center of the substrate 10 from below the arc portions of the dam material 22 corresponding to the light emitting regions 21R, 21G, 21B, and 21A in the light emitting units 20, respectively. It is pulled out nearby. On the other hand, the common electrode 12 is common to the light emitting regions 21R, 21G, 21B, and 21A. The common electrode 12 extends in a cross shape below the straight portion of the dam material 22 in each light emitting unit 20, and is drawn from there to the vicinity of the through hole 17 in the center of the substrate 10.

  The individual electrodes 11R, 11G, 11B, and 11A correspond to anode electrodes, and the common electrode 12 corresponds to a cathode electrode. By connecting the portion of the through hole 17 of the substrate 10 to an external power source, current is supplied to the LED elements 31 to 34 of each light emitting unit 20, and the light emitting regions 21 R, 21 G, 21 B, and 21 A of each light emitting unit 20 emit light. To do.

  In order to enable the light emitting regions 21R, 21G, 21B, and 21A to emit light independently from each other, a maximum of eight systems of electrodes are required. However, as the number of light emitting portions and light emitting regions increases, the necessary electrodes are arranged on one side of the substrate 10. It becomes difficult to wire all of them. For this reason, in the light emitting device 2, the number of electrodes is reduced to five by combining the cathode electrodes of the four light emitting regions 21R, 21G, 21B, and 21A into one common electrode 12 (a common cathode).

  4 and 6, the individual electrodes 11R, 11G, 11B, and 11A and the common electrode 12 are covered with a resist 13 except for a part around each light emitting portion 20, and are hidden. Yes. Around each light emitting unit 20, the individual electrodes 11R, 11G, 11B, and 11A and the common electrode 12 are exposed on the substrate 10 as inspection terminals 14R, 14G, 14B, 14A, and 15 respectively. The inspection terminals 14R, 14G, 14B, 14A, and 15 are for confirming the operation (lighting) of the light emitting regions 21R, 21G, 21B, and 21A. In the light emitting device 2, one light emitting region of one light emitting unit 20 is formed by connecting a power source between the inspection terminals 14 R, 14 G, 14 B, 14 A and the inspection terminal 15 without mounting the shorting element. It is also possible to light only.

  Next, the arrangement of the light emitting regions 21R, 21G, 21B, and 21A of each light emitting unit 20 will be described with reference to FIG.

As shown in FIG. 4, the shapes of the light emitting regions 21 </ b> R, 21 </ b> G, 21 </ b> B, and 21 </ b> A in each light emitting unit 20 are all the same fan shape with a central angle of 90 degrees, and are rotationally symmetric with respect to the center of the light emitting unit 20. In the light emitting device 2, the arrangement angles of the light emitting regions 21 </ b> R, 21 </ b> G, 21 </ b> B, 21 </ b> A with respect to a reference direction (for example, the major axis direction or minor axis direction of the ellipse) within the upper surface of the substrate 10 are different for each light emitting unit 20. In other words, with respect to the upper center of the light emitting portion 20 ₁ in FIG. 4, the light emitting portion 20 ₂ on the right side, the light emitting region 21R, 21G, 21B, 21A is rotated 90 degrees clockwise. Further, the light emitting unit 20 _2, the light emitting portion 20 ₃ at the right end in the figure, the light emitting region 21R, 21G, 21B, 21A is rotated 90 degrees clockwise. The same applies to the light emitting units 20 _{3 to} 20 _{8. In} the light emitting device 2, the arrangement angles of the light emitting regions 21 R, 21 G, 21 B, and 21 A of the respective light emitting units 20 in the upper surface of the substrate 10 are different by 90 degrees.

Emitting region 21R of the light emitting portion 20, 21G, 21B, 21A disposed angle of, when based on the light emitting unit 20 _1, 0 degree, 90 degrees, four types of 180 degrees and 270 degrees. In the light emitting device 2, since one light emitting unit 20 has four light emitting regions, the arrangement angle of the light emitting regions between the light emitting units 20 differs by an integral multiple of “360 degrees / 4 = 90 degrees”. Therefore, the light emitting portion 20 ₁ and the light emitting portion 20 _5, the light emitting portion 20 ₂ and the light emitting unit 20 _6, the light emitting portion 20 ₃ and the light emitting unit 20 _7, and a light emitting portion 20 ₄ emitting portion 20 _8, the arrangement angle of the light emitting region Are the same. When the light emitting regions 21R, 21G, 21B, and 21A of the adjacent light emitting units 20 are rotationally symmetrical with each other by 90 degrees, the light emitting device 2 has the same arrangement of the light emitting regions of all the light emitting units 20 with respect to the reference direction. Compared to the above, the color mixing property is improved when the light emitting areas are collectively emitted.

  As described above, the arrangement angles of the light emitting regions with respect to the reference direction in the upper surface of the substrate 10 may not necessarily be different from each other for all the light emitting units, and the arrangement angles of some of the light emitting units may be the same. . Moreover, the difference in the arrangement angle between the light emitting units 20 may be made smaller than 90 degrees, and the arrangement angles may be made different for all the light emitting units.

  FIG. 7 is a top view of another light emitting device 2a. FIG. 8 is a top view of the light emitting unit 20a in the light emitting device 2a. The light emitting device 2a is different from the light emitting device 2 in that the number of light emitting regions in one light emitting unit 20a is three, which is one less than that in the light emitting device 2, but otherwise has the same configuration as the light emitting device 2. Have. Therefore, in the following, the light emitting device 2a will be described with a focus on differences from the light emitting device 2, and the description overlapping with the light emitting device 2 will be omitted. In FIG. 7, the lens array 40 is not shown.

  As shown in FIGS. 7 and 8, in the light emitting device 2a, the three regions divided by the dam material 22a and covered with the sealing resins 23R, 23G, and 23B correspond to the light emitting regions 21R, 21G, and 21B, respectively. . Each of the light emitting regions 21R, 21G, and 21B has a fan shape with a central angle of 120 degrees, and one circular light emitting region is configured by these fan shapes. The light emitting region 21R emits light in red (R), the light emitting region 21G emits light in green (G), and the light emitting region 21B emits light in blue (B). Also in the light emitting device 2a, the substrate 10 is provided with three individual electrodes 11R, 11G, and 11B corresponding to the light emitting regions 21R, 21G, and 21B, respectively, and one common electrode 12 that is common to these light emitting regions. The three light emitting areas of each light emitting unit 20 can emit light independently of each other. In the light emitting device 2a, white light can be obtained by emitting all of the light emitting regions 21R, 21G, and 21B.

  The dam material 22a is a frame that serves as a boundary between the light emitting regions 21R, 21G, and 21B, and passes through an annular portion that serves as a boundary on the outer peripheral side of the light emitting unit 20a and the center of the circle, and divides the circle into three equal parts. A linear portion of the book. The lengths of the three straight portions are all the same as the radius of the circle. In FIG. 8, the dam material 22a is illustrated as being transparent.

  The LED elements 31 to 33 are, for example, the same blue LEDs as those of the light emitting device 2, and are divided into three parts by the dam material 22 a in the light emitting unit 20, respectively, in regions on the substrate 10 corresponding to the light emitting regions 21 R, 21 G, and 21 B. Has been implemented. In the illustrated example, 30 LED elements 31 are mounted on the light emitting area 21R, 30 LED elements 32 are mounted on the light emitting area 21G, and 30 LED elements 33 are mounted on the light emitting area 21B. The LED elements 31 to 33 are connected in series and parallel in each light emitting unit 20a. For example, 15 LED elements are connected in series, and two sets thereof are further connected in parallel to the wiring pattern on the substrate 10. That is, two 15-stage series connection circuits are connected in parallel. In FIG. 8, for the sake of simplicity, illustration of wires connecting the LED elements 31 to 33 is omitted.

  In FIG. 8, similarly to FIG. 5A, LED elements 31 to 33 having the same arrangement direction of the element electrodes of the LED elements are indicated by squares of the same color. The LED elements 31 to 33 indicated by white squares are mounted by rotating 90 degrees on the substrate 10 with respect to the LED elements 31 to 33 indicated by black squares. It is 90 degrees off. In each light emitting unit 20a, LED elements 31 to 33 having different mounting angles in the upper surface of the substrate 10 with respect to a certain reference direction on the substrate 10 are distributed symmetrically with respect to the straight line Y of FIG. 8 passing through the center of the light emitting unit 20a. doing. Further, as shown in FIG. 8, the LED elements 31 to 33 of each light emitting unit 20 a are arranged symmetrically with respect to the straight line Y.

  FIG. 9 is a diagram illustrating a modification of the arrangement of the LED elements 31 to 33 in the light emitting unit 20a. The light emitting part 20a of the light emitting device 2a may be one in which the LED elements 31 to 33 are arranged like the light emitting part 20a 'shown in FIG. In the light emitting unit 20a ', the arrangement of the LED elements 31 to 33 in the light emitting regions 21R, 21G, and 21B has a 120-degree rotational symmetry with respect to the center of the light emitting unit 20a'. Further, in the light emitting unit 20a ', the distribution of the mounting angles of the LED elements 31 to 33 is also in a 120-degree rotational symmetry relationship with respect to the center of the light emitting unit 20a'.

  Also in the light emitting device 2a, the individual electrodes 11R, 11G, and 11B have rectangular through holes 17 in the center of the substrate 10 from below the arc portions of the dam material 22a corresponding to the light emitting regions 21R, 21G, and 21B in the light emitting portions 20a. It is pulled out near. On the other hand, the common electrode 12 extends under the straight portion of the dam material 22a in each light emitting portion 20a in a Y shape, and is drawn from there to the vicinity of the through hole 17 in the center of the substrate 10. In the light emitting device 2a, the number of electrodes is reduced to four by combining the cathode electrodes of the three light emitting regions 21R, 21G, and 21B into one common electrode 12. In addition, as shown in FIG. 7, also in the light emitting device 2 a, the individual electrodes 11 </ b> R, 11 </ b> G, 11 </ b> B and a part of the common electrode 12 are operated in the light emitting regions 21 </ b> R, 21 </ b> G, 21 </ b> B around the respective light emitting units 20 a ( Are exposed on the substrate 10 as the inspection terminals 14R, 14G, 14B, and 15.

  As shown in FIG. 7, the light emitting regions 21R, 21G, and 21B in each light emitting unit 20a have the same fan shape with a central angle of 120 degrees and are rotationally symmetric with respect to the center of the light emitting unit 20a. In the light emitting device 2a as well, similarly to the light emitting device 2, the arrangement angles of the light emitting regions 21R, 21G, and 21B of the light emitting units 20a with respect to a certain reference direction in the upper surface of the substrate 10 are different by 120 degrees. There are three arrangement angles of the light emitting regions 21R, 21G, and 21B of each light emitting unit 20a: 0 degree, 120 degrees, and 240 degrees. In the light emitting device 2a, since one light emitting unit 20 has three light emitting regions, the arrangement angle of the light emitting regions between the light emitting units 20a differs by an integral multiple of “360 degrees / 3 = 120 degrees”. For this reason, some of the eight light emitting units 20a have the same arrangement angle of the light emitting regions. Even in the light emitting device 2a, the color mixing property when the light emitting regions are collectively emitted is improved as compared with the case where the light emitting regions of all the light emitting units 20a are arranged in the same direction with respect to the reference direction.

  FIG. 10 is a top view of yet another light emitting device 2b. The light emitting device 2b is different from the light emitting devices 2 and 2a in that the number of light emitting regions in one light emitting unit 20b is two, which is smaller than that of the light emitting devices 2 and 2a. Has the same configuration. Therefore, in the following, the light emitting device 2b will be described with a focus on differences from the light emitting devices 2 and 2a, and the description overlapping with the light emitting devices 2 and 2a will be omitted. In FIG. 10, the lens array 40 is not shown.

  As shown in FIG. 10, in the light emitting device 2b, the two regions divided by the dam material 22b and covered with the sealing resins 23W and 23C correspond to the light emitting regions 21W and 21C, respectively. The light emitting areas 21W and 21C are both fan-shaped (semi-circular) with a central angle of 180 degrees, and one circular light-emitting area is formed by these fan-shaped areas. The light emitting area 21W emits light in a warm color (color temperature 3500K), and the light emitting area 21C emits light in a cold color (color temperature 6500K). Also in the light emitting device 2b, the substrate 10 is provided with two individual electrodes 11W and 11C corresponding to the light emitting regions 21W and 21C, respectively, and one common electrode 12 common to these light emitting regions. Around each light emitting portion 20b, the individual electrodes 11W and 11C and a part of the common electrode 12 are exposed on the substrate 10 as inspection terminals 14W, 14C and 15, respectively. In the light emitting device 2b, the two light emitting regions of each light emitting unit 20b can emit light independently of each other, and the white color temperature can be adjusted by emitting both of them.

  The dam material 22b is a frame that serves as a boundary between the light emitting regions 21W and 21C, and a single ring that bisects the circle through the center of the circle and the annular portion that serves as the boundary on the outer peripheral side of the light emitting unit 20b. And a straight portion. The length of the straight portion is the same as the diameter of the circle.

  Each of the sealing resins 23W and 23C is filled in a region surrounded by the dam material 22b on the substrate 10, and integrally covers and protects the LED elements in the corresponding light emitting regions 21W and 21C and the wires connecting them. (Seal). The sealing resins 23W and 21C contain a green phosphor and a red phosphor whose ratios are adjusted.

  As shown in FIG. 10, in the light emitting device 2b as well, as in the light emitting devices 2 and 2a, the arrangement angles of the light emitting regions 21W and 21C of the light emitting units 20b with respect to a certain reference direction in the upper surface of the substrate 10 are different by 180 degrees. There are two arrangement angles of the light emitting regions 21W and 21C of each light emitting unit 20b, 0 degrees and 180 degrees. In the light emitting device 2b, since one light emitting unit 20 has two light emitting regions, the arrangement angle of the light emitting regions between the light emitting units 20b differs by an integral multiple of “360 degrees / 2 = 180 degrees”. Also in the light emitting device 2b, the color mixing property when the light emitting areas are collectively emitted is improved as compared with the case where the arrangement of the light emitting areas of all the light emitting units 20b with respect to the reference direction is the same.

  The amber light emitting region 21A may be replaced with a light emitting region of another color such as yellow. Further, for example, in addition to a visible light emitting unit such as RGB, a light emitting region that emits light other than visible light such as infrared light may be provided in one light emitting unit. In addition, for example, in addition to the three light emitting areas of RGB, one light emitting section is provided with three light emitting areas that respectively emit yellow (Y), magenta (M), and cyan (C) light. The number of light emitting regions per one may be six. Even in these cases, it is possible to provide the same number (n) of individual electrodes as the light emitting region for each light emitting unit and one common electrode on the substrate, thereby forming an (n + 1) system of electrodes. Even in these cases, the arrangement of the light emitting regions of all the light emitting units with respect to the reference direction is made the same by changing the arrangement angle of the light emitting regions with respect to the reference direction in the upper surface of the substrate 10 between the light emitting units. In comparison, the color mixing property when the light emitting regions are collectively emitted is improved.

  In the light emitting units 20, 20a, and 20b, all the light emitting regions have the same shape and the same area, but the shape and area may be different for each light emitting region in the light emitting unit. For example, an annular light emitting region adjacent to the four light emitting regions 21R, 21G, 21B, 21A in the light emitting unit 20 may be further provided on the outer peripheral side. In this case, the annular light emitting region may be further divided into four light emitting regions of RGBA by a dam material.

  Moreover, the board | substrate 10 is not restricted to an elliptical thing, A rectangle may be sufficient. In the case of using a rectangular substrate, for example, the direction of one side of the substrate may be set as a reference direction, and the arrangement angle of the light emitting region with respect to the reference direction may be varied between the light emitting units.

  The substrate 10 may be configured by attaching an insulating circuit substrate on a metal substrate. In this case, it is preferable that the LED elements 31 to 34 are directly mounted on the upper surface of the metal substrate by providing openings in portions corresponding to the light emitting portions 20, 20a, and 20b on the circuit board. If the metal substrate is made of aluminum or copper having excellent heat resistance and heat dissipation, the metal substrate functions as a heat dissipation substrate that dissipates heat generated in the light emitting units 20, 20a, and 20b.

Further, in order to facilitate the manufacture and improve the reliability of the light emitting devices 2, 2a, and 2b, all the elements having the same emission wavelength are used as the LED elements 31 to 34, and different kinds of fluorescent materials are used for the respective sealing resins. Different colors are obtained for each light emitting part by dispersing and mixing the body. However, as the LED elements 31 to 34, elements having different emission wavelengths may be used. For example, the LED element 31 may be a red LED that emits red light. In this case, the sealing resin 23 </ b> R may not contain a red phosphor. The LED element 32 may be a green LED that emits green light. In this case, the sealing resin 23G may not contain a green phosphor. The LED element 33 may be an element that emits light other than blue light, such as an ultraviolet LED element. In this case, the sealing resin 23B absorbs light from the LED element 33 and emits blue light. A phosphor such as ₁₀ O ₁₇ : Eu ²⁺ may be contained.

  The LED elements 31 to 34 are not limited to blue LEDs, and may be, for example, purple LEDs or near-ultraviolet LEDs, and the emission wavelength band may be in a range of about 200 to 460 nm including the ultraviolet region. . Further, for example, the LED elements 31 to 34 of a certain light emitting unit 20 are blue LEDs, and the LED elements 31 to 34 of the other light emitting units 20 are green LEDs. The emission wavelength bands may be different.

DESCRIPTION OF SYMBOLS 1 Illumination device 2, 2a, 2b Light-emitting device 10 Board | substrate 11R, 11G, 11B, 11A, 11W, 11C Individual electrode 12 Common electrode 20, 20a, 20a ', 20b Light emission part 21R, 21G, 21B, 21A, 21W, 21C Light emission Region 22, 22a, 22b Dam material 23R, 23G, 23B, 23A, 23W, 23C Sealing resin 31, 32, 33, 34 LED element 40 Lens array

Claims (9)

A substrate,
A plurality of light emitting portions formed on the upper surface of the substrate,
Each of the plurality of light emitting units has a plurality of light emitting regions that emit light in different colors,
Each of the plurality of light emitting regions has a plurality of light emitting elements mounted on the substrate and a sealing resin that is filled on the substrate and seals the plurality of light emitting elements,
An arrangement angle of the plurality of light emitting regions in the upper surface with respect to a reference direction in the upper surface of the substrate is different for each light emitting unit.
A light emitting device characterized by that. The shape of the plurality of light emitting regions in each light emitting unit is rotationally symmetric with respect to the center of the light emitting unit,
2. The light emitting device according to claim 1, wherein the arrangement angle between the light emitting units is different by an integral multiple of 360 degrees / n, where n is the number of the plurality of light emitting regions included in one light emitting unit. Each of the plurality of light emitting units is formed on the substrate and has n individual electrodes respectively corresponding to the plurality of light emitting regions of the light emitting unit, and all light emitting regions of the light emitting unit formed on the substrate. A common electrode,
The light emitting device according to claim 2, wherein the plurality of light emitting regions in each light emitting unit can emit light independently of each other. Each of the plurality of light emitting portions further includes a dam material that becomes a boundary between the light emitting regions,
The light emitting device according to claim 3, wherein the common electrode is formed on the substrate so as to pass under the dam material.   In each light emitting part, the n individual electrodes and a part of the common electrode of the light emitting part are exposed on the substrate as inspection terminals for the plurality of light emitting regions of the light emitting part. 5. The light emitting device according to 3 or 4. Each of the plurality of light emitting units has three light emitting regions that emit red, green, and blue light,
The light emitting device according to any one of claims 2 to 5, wherein the arrangement angles are three kinds of 0 degree, 120 degrees, and 240 degrees. Each of the plurality of light emitting units has three light emitting regions that emit red, green, and blue light, and one other light emitting region having a light emission wavelength different from that of the three light emitting regions,
The light emitting device according to any one of claims 2 to 5, wherein the arrangement angles are four types of 0 degree, 90 degrees, 180 degrees, and 270 degrees.   8. The light emitting device according to claim 6, wherein light emitting elements having different mounting angles in the upper surface with respect to the reference direction in each light emitting unit are arranged symmetrically with respect to a straight line passing through the center of the light emitting unit. .   8. The light emitting device according to claim 6, wherein in each of the light emitting units, the plurality of light emitting elements of the plurality of light emitting regions are arranged in line symmetry with respect to a straight line passing through a center of the light emitting unit in the upper surface. .

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