JP6865570B2 - Light emitting device - Google Patents

Description

The present invention relates to a light emitting device.

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. In some of these light emitting devices, the 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).

Japanese Unexamined Patent Publication No. 2008-235680 Japanese Unexamined Patent Publication No. 2011-049516 Japanese Unexamined Patent Publication No. 2011-108744

A plurality of light emitting parts are formed on one common substrate so that the amount of emitted light is large and light of various colors can be generated, and the individual light emitting parts are divided into a plurality of light emitting regions that emit light in different colors. Consider manufacturing a light emitting device. In such a light emitting device, depending on the arrangement of the light emitting regions on the common substrate, color unevenness of the emitted light may be conspicuous when each light emitting region is collectively emitted.

Therefore, an object of the present invention is to improve the color mixing property of light from each light emitting part in a light emitting device in which a plurality of light emitting parts having a plurality of light emitting regions that emit light in different colors are formed on a common substrate. Is.

It has a substrate and a plurality of light emitting parts formed on the upper surface of the substrate, each of the plurality of light emitting parts 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. It has a plurality of light emitting elements mounted on the substrate and a sealing resin filled on the substrate to seal the plurality of light emitting elements, and the arrangement angle of the plurality of light emitting regions in the upper surface with respect to the reference direction in the upper surface of the substrate is large. A light emitting device is provided, which is characterized by being different for each light emitting unit.

In the above light emitting device, the shapes of the plurality of light emitting regions in each light emitting unit are rotationally symmetric with respect to the center of the light emitting unit, and assuming that the number of the plurality of light emitting regions possessed by one light emitting unit is n, the light emitting units are connected to each other. It is preferable that the arrangement angles of the above differ by an integral multiple of 360 degrees / n.

In the above light emitting device, each of the plurality of light emitting parts is formed on a substrate and each of the n individual electrodes corresponding to the plurality of light emitting regions of the light emitting part, and all the light emitting parts of the light emitting part formed on the substrate. It is preferable that the regions have a common electrode and the plurality of light emitting regions in the individual light emitting portions can emit light independently of each other.

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

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

In the above light emitting device, each of the plurality of light emitting units has three light emitting regions that emit red, green, and blue light, and the arrangement angles are preferably 0 degrees, 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 whose emission wavelength is different from the three light emitting regions, and the arrangement angles are 0 degrees and 90 degrees. It is preferably four degrees, 180 degrees and 270 degrees.

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

According to the present invention, in a light emitting device in which a plurality of light emitting units having a plurality of light emitting regions that emit light in different colors are formed on a common substrate, it is possible to improve the color mixing property of the light from each light emitting unit. Is.

It is a front view of the lighting device 1. It is a top view and a side view of a light emitting device 2. It is a top view of the lens array 40. It is a top view of the light emitting device 2 excluding the lens array 40. It is a top view and sectional view of the light emitting part 20 in a light emitting device 2. It is a top view which shows the electrode pattern on a substrate 10. It is a top view of another light emitting device 2a. It is a top view of the light emitting part 20a in a light emitting device 2a. It is a figure which shows the modification of the arrangement of LED elements 31-3 in a light emitting part 20a. It is a top view of still 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 embodiments described below.

FIG. 1 is a front view of the lighting device 1. The lighting device 1 is a device that can be used as, for example, a floodlight for lighting. 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 lighting device 1 and the light emitting device 2 are not limited to the elliptical shape shown in the figure, but may have other shapes such as a rectangle, and the number of the light emitting devices 2 may be other than four. Further, the lighting device 1 has a heat sink (for example, a heat radiating fin) for promoting the release of heat generated by 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 arranged between the light emitting device 2 and the heat sink.

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

The substrate 10 is, for example, an insulating substrate made of ceramics, and has an elliptical shape with a major axis and a minor axis of 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 a common substrate 10 at intervals, and each of the light emitting portions 20 is independently arranged and evenly arranged along the outer circumference 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 has eight light emitting units 20, but the number of light emitting units 20 in the light emitting device is not particularly limited, and their arrangement may be different from that shown in the figure.

FIG. 3 is a top view of the lens array 40. The lens array 40 is an aggregate of lenses in which a plurality of lenses 41 are integrally formed, and in the illustrated example, the lens array 40 has eight lenses 41, which is the same as the number of 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 to collect the light emitted from the corresponding light emitting unit 20 and to irradiate the light emitted from the plurality of light emitting units 20 in an overlapping manner at a position sufficiently distant from the substrate 10. ..

FIG. 4 is a top view of the light emitting device 2 excluding the lens array 40. In Figure 4, for convenience, the light-emitting portion 20 disposed on the upper side of the center of the figure as "light-emitting portion 20 _1", from clockwise thereto, the light emitting unit 20 indicated as "light-emitting portion 20 _{2-20 8"} ing. The small circle indicated by reference numeral 16 is a screw hole for fixing the substrate 10 to the housing 3, and the square indicated by reference numeral 17 is a through hole of the substrate 10.

5 (A) and 5 (B) 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 portion 20 along the VB-VB line of FIG. 5A. The eight light emitting units 20 in the light emitting device 2 all have the same configuration, and one of them is shown in an enlarged manner in FIGS. 5 (A) and 5 (B). Each light emitting unit 20 has four light emitting regions 21R, 21G, 21B, and 21A (see FIG. 4) that emit light in different colors, and as components of these light emitting regions, a dam material 22 and a sealing resin. It has 23R, 23G, 23B, 23A and LED elements 31 to 34.

As shown in FIGS. 4 and 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 the light emitting regions 21R, 21G, 21B, and 21A, respectively. Equivalent to. The light emitting regions 21R, 21G, 21B, and 21A are all fan-shaped with a central angle of 90 degrees, and one circular light emitting region is formed by these fan shapes. The light emitting region 21R emits light in red (R), the light emitting region 21G emits light in green (G), the light emitting region 21B emits light in blue (B), and the light emitting region 21A emits light in amber color (A). As described below, the substrate 10 is provided with electrodes corresponding to these light emitting regions separately, and the four light emitting regions of each light emitting unit 20 can emit light independently of each other. Therefore, in the light emitting device 2, it is possible to emit light for each color, and white light can be obtained by emitting light of all four colors. Further, the overall emission color can be adjusted by adjusting the current flowing in each emission 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 resin 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 serves as a boundary on the outer peripheral side of the light emitting portion 20 and two straight portions that pass through the center of the circle and divide the circle into four equal parts, and are mounted on the substrate 10. It surrounds the LED elements 31 to 34. The length of the two straight lines is the same as the diameter of the circle. The dam material 22 has, for example, a reflective coating applied to its surface, so that the light emitted laterally from the LED elements 31 to 34 can be seen above the light emitting unit 20 (viewed from the LED elements 31 to 34). Reflect toward the side opposite to the substrate 10). In addition, in FIG. 5A, the dam material 22 is shown as being transparent.

The LED elements 31 to 34 are examples of light emitting elements, and are, for example, blue LEDs composed of a gallium nitride based compound semiconductor or the like and emitting blue light having an emission wavelength band of about 450 to 460 nm. The LED elements 31 to 34 are mounted in the regions on the substrate 10 corresponding to the light emitting regions 21R, 21G, 21B, and 21A, respectively, with the light emitting surface facing the side opposite to the substrate 10. In the illustrated example, 20 LED elements 31 are in the light emitting region 21R, 20 LED elements 32 are in the light emitting region 21G, 20 LED elements 33 are in the light emitting region 21B, and 20 LED elements are in the light emitting region 21A. 34 are implemented respectively. The lower surface of the LED elements 31 to 34 is 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 formed by a bonding wire 35 (hereinafter, simply referred to as a wire 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. For example, five LED elements 31 to 34 in each light emitting unit 20 may be connected in series, and four sets thereof may be further connected in parallel to a wiring pattern on the substrate 10. As a result, a current is supplied to each of the LED elements 31 to 34 via the wire 35. In FIG. 5A, the wire 35 is not shown for the sake of 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 amount of light. 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 series and parallel numbers of the LED elements 31 to 34 in each light emitting unit 20 may be the same in all the light emitting units 20 and the light emitting regions 21R, 21G, 21B, 21A, or may be different for each light emitting unit or the light emitting region. Good.

In FIG. 5A, the LED elements 31 to 34 are shown by white squares and black squares. The LED elements 31 to 34 shown by the squares of the same color all have the same arrangement direction of the element electrodes of the LED element. On the other hand, the LED elements 31 to 34 indicated by the white squares and the LED elements 31 to 34 indicated by the black squares are 90 degrees out of alignment with each other in the arrangement direction of the element electrodes of the LED elements. That is, the LED elements 31 to 34 shown by the white squares are mounted on the substrate 10 by rotating 90 degrees with respect to the LED elements 31 to 34 shown by the black squares. In FIG. 5A, the distribution of the white square and the black square is axisymmetric with respect to the straight line Y in the vertical direction in the figure passing 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 in the upper surface of the substrate 10 with respect to the reference direction on the substrate 10 (for example, the major axis direction or the minor axis direction of the ellipse) are straight lines Y. It is distributed line-symmetrically with respect to.

Further, as shown in FIG. 5A, the LED elements 31 to 34 of each light emitting unit 20 pass through the center of the straight line portion of the dam material 22, that is, the center of the light emitting unit 20, and the upper surface of the substrate 10. They are arranged line-symmetrically with respect to the two straight lines X and Y that are 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, since the arrangement of the LED elements 31 to 34 of each light emitting unit 20 and the distribution of the mounting angles have symmetry, the mounting process of the LED elements 31 to 34 at the time of manufacturing the light emitting device 2 becomes easy.

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, 21A are filled. The whole of the above is 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. As a result, the light emitting region 21R emits red light in a wavelength range 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. As a result, the light emitting region 21G emits green light in a wavelength range of, for example, 500 to 570 nm.

The sealing resin 23B is a sealing resin having a 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 that does not contain a phosphor. The light emitting region 21B emits blue light in a wavelength range of, for example, 450 to 490 nm.

The sealing resin 23A is a sealing resin having a light emitting region 21A that emits amber light. Since the amber wavelength region spans the long wavelength region of yellow and the short wavelength region of yellow-red, 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. As a result, the light emitting region 21A emits amber-colored light having a wavelength range of, for example, 580 to 600 nm. The sealing resin 23A may contain one type of amber phosphor or two types of green phosphor and red phosphor instead of the yellow phosphor and the red phosphor. Amber light emission can be realized by any of the above three methods.

One sealing resin may contain a plurality of types of phosphors, or 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, 11A and a common electrode 12, which are formed on the upper surface of the substrate 10.

The individual electrodes 11R, 11G, 11B, 11A are provided corresponding to the light emitting regions 21R, 21G, 21B, 21A, respectively. The individual electrodes 11R, 11G, 11B, 11A are formed by a rectangular through hole 17 in the center of the substrate 10 from below the arc portion of the dam material 22 corresponding to the light emitting regions 21R, 21G, 21B, 21A in each light emitting portion 20. It is pulled out in the vicinity. 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 under the straight portion of the dam material 22 in each light emitting portion 20, and is drawn out from there in the vicinity of the through hole 17 in the center of the substrate 10.

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

A maximum of eight electrodes are required to enable the light emitting regions 21R, 21G, 21B, and 21A to emit light independently of each other. However, when the number of light emitting parts and light emitting regions increases, the necessary electrodes are provided on one side of the substrate 10. It becomes difficult to wire everything to. Therefore, in the light emitting device 2, the number of electrodes is reduced to 5 by combining the cathode electrodes of the four light emitting regions 21R, 21G, 21B, and 21A into one common electrode 12 (making the cathode common).

As can be seen by comparing FIGS. 4 and 6, the individual electrodes 11R, 11G, 11B, 11A and the common electrode 12 are covered and hidden by the resist 13 except for a part around each light emitting portion 20. There is. Around each light emitting unit 20, the individual electrodes 11R, 11G, 11B, 11A and the common electrode 12 are exposed on the substrate 10 as inspection terminals 14R, 14G, 14B, 14A, 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, 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 14R, 14G, 14B, 14A and the inspection terminal 15 without mounting the short circuit element. It is also possible to turn on 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 21R, 21G, 21B, and 21A in each light emitting unit 20 are 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 21R, 21G, 21B, and 21A with respect to the reference direction (for example, the major axis direction or the minor axis direction of the ellipse) in 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 portion ₂₀ 3-20 _8, the light emitting device 2, the light emitting region 21R of the light-emitting portions 20 in the upper surface of the substrate 10, 21G, 21B, the arrangement angle of 21A differs 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 angles of the light emitting regions between the light emitting units 20 are different 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 Is the same. When the light emitting regions 21R, 21G, 21B, and 21A of the adjacent light emitting units 20 are rotationally symmetric 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 with this, the color mixing property when each light emitting region is made to emit light at once is improved.

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

FIG. 7 is a top view of another light emitting device 2a. Further, FIG. 8 is a top view of the light emitting unit 20a in the light emitting device 2a. The light emitting device 2a differs 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 case of the light emitting device 2, but has the same configuration as the light emitting device 2 in other respects. Have. Therefore, in the following, the light emitting device 2a will be mainly described in terms of differences from the light emitting device 2, and the description overlapping with the light emitting device 2 will be omitted. Note that the lens array 40 is not shown in FIG. 7.

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, 23B correspond to the light emitting regions 21R, 21G, 21B, respectively. .. The light emitting regions 21R, 21G, and 21B are all fan-shaped with a central angle of 120 degrees, and one circular light emitting region is formed 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, 11B corresponding to the light emitting regions 21R, 21G, 21B, and one common electrode 12 common to these light emitting regions. The three light emitting regions 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 light in 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 divides the circle into three equal parts by passing through the center of the circle and the annular portion that serves as the boundary on the outer peripheral side of the light emitting portion 20a. It has a straight portion of the book. The lengths of the three straight lines are all the same as the radius of the circle. In FIG. 8, the dam material 22a is shown 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 by the dam material 22a in the light emitting unit 20, respectively, and are divided into three regions on the substrate 10 corresponding to the light emitting regions 21R, 21G, and 21B. It is implemented. In the illustrated example, 30 LED elements 31 are mounted in the light emitting region 21R, 30 LED elements 32 are mounted in the light emitting region 21G, and 30 LED elements 33 are mounted in the light emitting region 21B. The LED elements 31 to 33 are connected in series and parallel at 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, the wires connecting the LED elements 31 to 33 are not shown.

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 shown by squares of the same color. The LED elements 31 to 33 indicated by the white squares are mounted by rotating 90 degrees on the substrate 10 with respect to the LED elements 31 to 33 indicated by the black squares, and the arrangement direction of the element electrodes is different. It is off by 90 degrees. In each light emitting unit 20a, the 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 line-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 20a are arranged line-symmetrically with respect to the straight line Y.

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

In the light emitting device 2a, the individual electrodes 11R, 11G, 11B also have a rectangular through hole 17 in the center of the substrate 10 from below the arc portion of the dam material 22a corresponding to the light emitting regions 21R, 21G, 21B in each light emitting portion 20a. It is pulled out near. On the other hand, the common electrode 12 extends in a Y shape under the straight portion of the dam material 22a in each light emitting portion 20a, and is drawn out from 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. Further, as shown in FIG. 7, even in the light emitting device 2a, around each light emitting unit 20a, the individual electrodes 11R, 11G, 11B and a part of the common electrode 12 operate the light emitting regions 21R, 21G, 21B, respectively. The inspection terminals 14R, 14G, 14B, and 15 are exposed on the substrate 10 to confirm (lighting).

As shown in FIG. 7, the shapes of the light emitting regions 21R, 21G, and 21B in each light emitting unit 20a are the same fan shape having a central angle of 120 degrees, and are rotationally symmetric with respect to the center of the light emitting unit 20a. Similarly to the light emitting device 2, the light emitting device 2a also has different arrangement angles of the light emitting regions 21R, 21G, and 21B of the light emitting portions 20a with respect to a certain reference direction in the upper surface of the substrate 10 by 120 degrees. The arrangement angles of the light emitting regions 21R, 21G, and 21B of each light emitting unit 20a are 0 degrees, 120 degrees, and 240 degrees. In the light emitting device 2a, since one light emitting unit 20 has three light emitting regions, the arrangement angles of the light emitting regions between the light emitting units 20a differ by an integral multiple of "360 degrees / 3 = 120 degrees". Therefore, a part of the eight light emitting units 20a has the same arrangement angle of the light emitting region. Even in the light emitting device 2a, the color mixing property when all 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 smaller than that in the case of the light emitting devices 2 and 2a. Has the same configuration as. Therefore, in the following, the light emitting device 2b will be mainly described in terms of differences from the light emitting devices 2 and 2a, and the description overlapping with the light emitting devices 2 and 2a will be omitted. Also in FIG. 10, the illustration of the lens array 40 is omitted.

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 regions 21W and 21C are both fan-shaped (semi-circular) having a central angle of 180 degrees, and one circular light emitting region is formed by these fan shapes. The light emitting region 21W emits light in a warm color (color temperature 3500K), and the light emitting region 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 if both of them are made to emit light, the white color temperature can be adjusted.

The dam material 22b is a frame that serves as a boundary between the light emitting regions 21W and 21C, and has an annular portion that serves as a boundary on the outer peripheral side of the light emitting portion 20b and a single circle that passes through the center of the circle and divides the circle into two equal parts. It has a straight portion. The length of the straight part is the same as the diameter of the circle.

The sealing resins 23W and 23C are filled in the region surrounded by the dam material 22b on the substrate 10, respectively, and integrally cover and protect the entire LED element and the wire connecting them in the corresponding light emitting region 21W and 21C. (Sealing). The sealing resins 23W and 21C contain a green phosphor and a red phosphor whose ratio is adjusted.

As shown in FIG. 10, also in the light emitting device 2b, the arrangement angles of the light emitting regions 21W and 21C of the light emitting portions 20b with respect to a certain reference direction in the upper surface of the substrate 10 are different by 180 degrees, similarly to the light emitting devices 2 and 2a. There are two arrangement angles of the light emitting regions 21W and 21C of each light emitting unit 20b, 0 degree and 180 degrees. In the light emitting device 2b, since one light emitting unit 20 has two light emitting regions, the arrangement angles of the light emitting regions between the light emitting units 20b differ by an integral multiple of "360 degrees / 2 = 180 degrees". Even in the light emitting device 2b, the color mixing property when all 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 20b are arranged in the same direction with respect to the reference direction.

The light emitting region 21A of the amber may be replaced with a light emitting region of another color such as yellow. Further, for example, one light emitting unit may be provided with a light emitting region that emits light other than visible light such as infrared rays, in addition to the light emitting unit of visible light such as RGB. Further, for example, in addition to the three light emitting regions of RGB, one light emitting unit is provided with three light emitting regions that emit yellow (Y), magenta (M), and cyan (C) light, respectively. 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 to form the electrodes in the (n + 1) system. Further, even in these cases, the arrangement of the light emitting regions in the upper surface of the substrate 10 with respect to the reference direction is made different between the light emitting parts, so that the arrangement of the light emitting regions of all the light emitting parts with respect to the reference direction is the same. In comparison, the color mixing property when each light emitting region is made to emit light at once 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 shapes and areas 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 may be further provided on the outer peripheral side of the light emitting unit 20. In this case, the annular light emitting region may be further divided into four RGBA light emitting regions by the dam material.

Further, the substrate 10 is not limited to an elliptical shape, and may be a rectangular shape. When a rectangular substrate is used, for example, the direction of one side of the substrate may be used as a reference direction, and the arrangement angle of the light emitting region with respect to the reference direction may be different between the light emitting units.

The substrate 10 may be configured by laminating an insulating circuit board on a metal substrate. In this case, it is preferable to provide openings in the portions corresponding to the light emitting portions 20, 20a and 20b on the circuit board and mount the LED elements 31 to 34 directly on the upper surface of the metal substrate. 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 portions 20, 20a and 20b.

Further, in the light emitting devices 2, 2a and 2b, in order to facilitate the production and improve the reliability, all the elements having the same light emitting wavelength are used as the LED elements 31 to 34, and different types of fluorescence are used for each sealing resin. By dispersing and mixing the body, different colors are obtained for each light emitting part. 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, and in this case, the sealing resin 23R does not have to contain a red phosphor. Further, the LED element 32 may be a green LED that emits green light, and in this case, the sealing resin 23G does not have to contain a green phosphor. Further, the LED element 33 may be an element such as an ultraviolet LED element that emits light other than blue light. In this case, the sealing resin 23B absorbs the light from the LED element 33 and emits light in blue. ₁₀ O ₁₇ : A phosphor such as ^{Eu 2+ may be contained.}

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

1 Lighting device 2,2a, 2b Light emitting device 10 Substrate 11R, 11G, 11B, 11A, 11W, 11C Individual electrode 12 Common electrode 20, 20a, 20a', 20b Light emitting part 21R, 21G, 21B, 21A, 21W, 21C Light emission Areas 22, 22a, 22b Dam material 23R, 23G, 23B, 23A, 23W, 23C Encapsulating resin 31, 32, 33, 34 LED element 40 Lens array

Claims (8)

With the board
It has a plurality of light emitting portions formed on the upper surface of the substrate, and has a plurality of light emitting portions.
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 filled on the substrate to seal the plurality of light emitting elements.
Arrangement angles of the plurality of light emitting regions of said upper surface relative to a reference direction in the upper surface of the substrate varies for each light emitting portion,
Each of the plurality of light emitting units has n individual electrodes formed on the substrate and corresponding to the plurality of light emitting regions of the light emitting unit, and all the light emitting regions of the light emitting unit formed on the substrate. Has a common common electrode and
In each light emitting unit, the n individual electrodes of the light emitting unit and a part of the common electrode are exposed on the substrate as inspection terminals of the plurality of light emitting regions of the light emitting unit.
A light emitting device characterized in that. The shapes of the plurality of light emitting regions in the individual light emitting parts are rotationally symmetric with respect to the center of the light emitting parts.
The light emitting device according to claim 1, wherein when the number of the plurality of light emitting regions possessed by one light emitting unit is n, the arrangement angles of the light emitting units differ by an integral multiple of 360 degrees / n. Wherein the plurality of light emitting regions in individual light-emitting portion is capable of emitting light independently of each other, the light emitting device according to claim 1 or 2. Each of the plurality of light emitting portions further has a dam material that serves as a boundary between the light emitting regions.
The light emitting device according to any one of claims 1 to 3, wherein the common electrode is formed so as to pass under the dam material on the substrate. 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 4 , wherein the arrangement angle is 0 degree, 120 degree, and 240 degree. 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 wavelength different from that of the three light emitting regions.
The light emitting device according to any one of claims 2 to 4 , wherein the arrangement angle is 0 degree, 90 degree, 180 degree and 270 degree. In each light emitting unit, individual light emitting elements in a plurality of light emitting regions in which the arrangement directions of the element electrodes in the upper surface with respect to the reference direction are different are arranged line-symmetrically with respect to a straight line passing through the center of the light emitting unit. , The light emitting device according to claim 5 or 6. The light emitting device according to claim 5 or 6 , wherein in each light emitting unit, the plurality of light emitting elements in the plurality of light emitting regions are arranged line-symmetrically with respect to a straight line passing through the center of the light emitting unit in the upper surface. ..

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