Light source device and lighting device

Abstract

This device provides a light source with multiple circuit boards while offering a high degree of flexibility in wiring. [Solution] The light source device 12 comprises a plurality of substrates 23, a plurality of light-emitting elements 24 disposed on each of the plurality of substrates 23, a connector 25 disposed on each of the plurality of substrates 23, and a wiring member 32. One end of the wiring member 32 is connected to a connector 25 disposed on one substrate 23, and the other end is connected to a connector 25 disposed on a substrate 23 different from the first substrate 23. Each substrate 23 has a periphery with an opposing edge portion 26 that faces other substrates 23 and a non-opposing edge portion 27 that does not face other substrates 23. The connector 25 is disposed on the non-opposing edge portion 27 side of the substrate 23.

Description

Technical Field

[0001] Embodiments of the present invention relate to a light source device and a lighting device.

Background Art

[0002] Conventionally, there is a light source device including a plurality of substrates on which a light emitting element and a connector are respectively arranged, and these substrates are arranged adjacent to each other.

[0003] In such a light source device, it is necessary to connect wirings to the plurality of substrates respectively. However, since the plurality of substrates are arranged adjacent to each other, the degree of freedom of wiring is low.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem to be solved by the present invention is to provide a light source device and a lighting device that have a high degree of freedom in wiring while including a plurality of substrates.

Means for Solving the Problems

[0006] The light source device according to the embodiment includes a plurality of substrates, a plurality of light emitting elements respectively arranged on the plurality of substrates, a connector respectively arranged on the plurality of substrates, and a wiring member. One end side of the wiring member is connected to a connector arranged on one substrate, and the other end side is connected to a connector arranged on a substrate different from the one substrate. Each of the substrates has an opposing side portion facing another substrate and a non-opposing side portion not facing another substrate at a peripheral portion. The connector is arranged on the non-opposing side portion side of the substrate.

Effects of the Invention

[0007] According to the light source device of this embodiment, it is expected that the degree of freedom in wiring can be increased even while having multiple substrates. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of a lighting device showing one embodiment. [Figure 2] This is a front view of the heat sink and light source of the same lighting device. [Figure 3] This is a front view of the light source module of the same light source device. [Figure 4] (a) to (g) are schematic front views showing the relationship between the external shape of the light source device and the virtual rectangle, respectively. [Modes for carrying out the invention]

[0009] One embodiment will be described below with reference to the drawings.

[0010] Figure 1 shows a schematic diagram of the lighting device 10. The lighting device 10 is, for example, a spotlight capable of projecting light of any color. The lighting device 10 comprises a heat sink 11, a light source device 12 disposed on the heat sink 11, a diffuser plate 13 that diffuses the light emitted from the light source device 12, an aperture body 15 having an aperture 14 through which the light transmitted through the diffuser plate 13 passes, a projection lens 16 that projects the light that has passed through the aperture 14, and a moving mechanism 18 that moves the light source unit 17, which is integrally formed by the heat sink 11, the light source device 12, the diffuser plate 13, and the aperture body 15, in the forward direction, which is the direction of light irradiation, or in the backward direction opposite to this forward direction. Furthermore, the lighting device 10 includes a housing that houses or accommodates the above-mentioned components (light source unit 17, moving mechanism 18, projection lens 16), and a power supply unit that lights up the light source device 12. The light source unit 17 may also include, for example, lenses such as collimator lenses and focusing lenses, or optical systems such as reflectors or light shields, in order to control the light emitted by the light source device 12 and have it incident onto the diffuser plate 13.

[0011] The moving mechanism 18 supports the light source unit 17 so that it can move toward the projection lens 16 (hereinafter referred to as the forward direction) or toward the projection lens 16 (hereinafter referred to as the backward direction). By operating a handle or the like, the feed mechanism is activated to move the moving mechanism 18 and the light source unit 17 together, making it possible to adjust the size of the light projected from the lighting device 10.

[0012] Figure 2 shows a front view of the heat sink 11 and light source device 12 of the lighting device 10.

[0013] The heat sink 11 is made of a metal such as aluminum, which has excellent thermal conductivity and heat dissipation properties, and a light source mounting surface 20 for mounting the light source device 12 is provided on its front side. The light source mounting surface 20 is planar and has an outer shape such as a square or a rectangle with elongated vertical or horizontal directions. The outer shape of the light source mounting surface 20 is not limited to a square, but may be a polygon with pentagons or more, or a circle, etc. The back side of the heat sink 11 may be provided with a heat dissipation structure such as heat dissipation fins.

[0014] The light source device 12 comprises a plurality of light source modules 22a, 22b, and 22c (also referred to as the first light source module 22a, the second light source module 22b, and the third light source module 22c). The light source modules 22a, 22b, and 22c are shaped by dividing them at predetermined angles in the circumferential direction centered on the center point O of the light source device 12, for example, by dividing them into three sections at 120-degree intervals. These three light source modules 22a, 22b, and 22c are arranged to be adjacent to each other in the circumferential direction centered on the center point O, thereby forming a single light source module assembly, the light source device 12.

[0015] Each light source module 22a, 22b, and 22c comprises a substrate 23 and a plurality of light-emitting elements 24 and a plurality of connectors 25 mounted on the front side, which is one side of the substrate 23.

[0016] As shown in Figures 2 and 3, the substrate 23 is formed as a pentagon having five vertices P1 to P5 and five sides. The pentagon is formed as a pentagon that is symmetrical with respect to a virtual line passing through one vertex P1 corresponding to the center point O. For example, the pentagon is symmetrical with respect to a perpendicular line extending from vertex P1 to the side opposite vertex P1.

[0017] When three substrates 23 are assembled and arranged as shown in Figure 2 such that the vertices P1 of the three substrates 23 are located at the center point O, the substrate 23 has opposing edges 26 that face other adjacent substrates 23 and non-opposing edges 27 that do not face other substrates 23. The opposing edges 26 consist of two opposing edges 26a and a second opposing edge 26b, and the non-opposing edges 27 consist of three non-opposing edges 27a, a second non-opposing edge 27b, and a third non-opposing edge 27c. The substrate 23 is formed in the shape of a pentagon having two opposing edges 26a, 26b and three non-opposing edges 27a, 27b, 27c, and when the three substrates 23 are assembled, a regular hexagonal substrate assembly is formed. In this embodiment, three substrates 23 are arranged together, and each substrate 23 has two opposing edges 26. However, the embodiment is not limited to this configuration. For example, four substrates 23 may be arranged together, and each substrate 23 may have two opposing edges 26. Alternatively, five substrates 23 may be arranged together, and one substrate 23 may have three opposing edges 26, and the other may have four opposing edges 26. When N substrates 23 are arranged together, the configuration will have a maximum of N-1 opposing edges 26. In this case, it is preferable that N is 3 or more. In other words, it is preferable that the minimum number of opposing edges 26 is 2.

[0018] On one substrate 23, the opposing side portions 26a and 26b are formed with an angle of 120 degrees via the vertex P1. Among the three non - opposing side portions 27a, 27b, and 27c, the first non - opposing side portion 27a is formed with an angle of 90 degrees via the vertex P2 between it and the first opposing side portion 26a, the second non - opposing side portion 27b is formed with an angle of 90 degrees via the vertex P3 between it and the second opposing side portion 26b, and the third non - opposing side portion 27c is formed with an angle of 120 degrees via the respective vertices P4 and P5 between it and the non - opposing side portions 27a and 27b respectively.

[0019] The third non - opposing side portion 27c is the longest side among the sides of the substrate 23 and forms one side of the regular hexagonal substrate assembly. The first non - opposing side portion 27a and the second non - opposing side portion 27b are the shortest sides among the sides of the substrate 23 and are half the length of the third non - opposing side portion 27c. When forming the regular hexagonal substrate assembly, the first non - opposing side portion 27a of two adjacent substrates 23 and the second non - opposing side portion 27b form one side of the regular hexagonal substrate assembly. The two opposing side portions 26a and 26b are longer than the first non - opposing side portion 27a and the second non - opposing side portion 27b and shorter than the third non - opposing side portion 27c.

[0020] Note that the shape of the substrate 23 is not limited to a pentagon where the outer sides that do not face other substrates 23 are formed by the three non - opposing side portions 27a, 27b, and 27c. It may be formed into a sector with an arc - shaped outer side, a rhombus with a triangular shape, etc. By using a substrate 23 with a sector - shaped outer side having an arc - shape, a substrate assembly with a circular outer shape may be formed. Alternatively, the outer shape of the substrate assembly may be a polygon other than a hexagon. Also, the shape of the substrates 23 of the light source modules 22a, 22b, and 22c is not limited to a shape divided into three in the circumferential direction centered on the center point O. It may be a shape divided into two, or a shape divided into four or more.

[0021] The substrate 23 is a single-layer substrate or a single-sided substrate, and has a base plate formed of an inorganic material such as a metal material like aluminum, a resin material like glass epoxy, or a ceramic such as aluminum oxide or aluminum nitride. A wiring pattern is formed on the front side of this base plate. The wiring pattern includes a plurality of light-emitting element mounting pad portions for mounting each light-emitting element 24, a pair of connector mounting pad portions provided at the peripheral portion (the non-opposing side portions 27a, 27b side) of the substrate 23, and a wiring portion that connects the light-emitting element mounting pad portions of each type of light-emitting element 24 in series or in series-parallel and whose both ends are connected to the pair of connector mounting pad portions. The wiring portion is wired along between the plurality of light-emitting element mounting pad portions or in the peripheral region of the substrate 23. When there is an intersection where some wiring portions cross, at that intersection, an upper-layer wiring portion that crosses a jumper insulating layer provided on the lower-layer wiring portion is provided, and the wiring portions are insulated from each other.

[0022] The substrate 23 is attached such that the back side, which is the other side opposite to the front side where the light-emitting element 24 and the connector 25 are mounted, is in surface contact with the light source mounting surface 20 of the radiator 11 and thermally connected. At this time, as shown in FIG. 2, the third non-opposing side portion 27c of the second light source module 22b is arranged to face parallel to the first side 20a, which is one side of the light source mounting surface portion 20 of the radiator 11. The first non-opposing side portion 27a of the first light source module 22a and the second non-opposing side portion 27b of the third light source module 27c are arranged to face parallel to the second side 20b, which is opposite to the first side 20a of the light source mounting surface portion 20 of the radiator 11. The vertex P5 of the first light source module 22a and the vertex P4 of the third light source module 22c are arranged to be closest to the third side 20c and the fourth side 20d that cross the respective sides 20a, 20b of the light source mounting surface 20 of the radiator 11. When the lighting device 10 is a spotlight, the first side 20a of the light source mounting surface 20 of the radiator 11 is the upper side, the second side 20b is the lower side, the third side 20c is the left side, and the fourth side 20d is the right side.

[0023] The second non-opposing side portion 27b of the first light source module 22a and the first non-opposing side portion 27a of the second light source module 22c are positioned opposite each other with a gap in between in the corner region formed by the first side 20a and the third side 20c of the light source mounting surface 20 of the heat sink 11, and a wiring space 28 is formed between them and the corner region. Similarly, the second non-opposing side portion 27b of the second light source module 22b and the first non-opposing side portion 27a of the third light source module 22c are positioned opposite each other with a gap in between in the corner region formed by the first side 20a and the fourth side 20d of the light source mounting surface 20 of the heat sink 11, and a wiring space 28 is formed between them and the corner region. In the front view shown in Figure 2, the wiring space 28 refers to the area of ​​the light source unit 17 where the heat sink 11 and the light source device 12 do not overlap. This configuration makes it possible to provide a larger wiring space 28, which increases the flexibility of the wiring to be placed in the wiring space 28.

[0024] Light source modules 22a, 22b, and 22c can be standardized by using light source modules with the same external dimensions, type of light-emitting element 24, and mounting position. From the viewpoint of standardization, it is preferable that light source modules 22a, 22b, and 22c are the same light source module, but they may be different light source modules. Different light source modules here refer to light source modules that have the same external dimensions and mounting position of the light-emitting element 24, but for example, have different types of light-emitting elements 24, different wiring patterns, or different positions for the connector 25.

[0025] Furthermore, the light-emitting element 24 may be of the SMD (Surface Mount Device) package type or CSP (Chip Scale Package) type, and is provided in a quadrilateral shape such as a square (cube) or rectangle (cuboid). The light-emitting element 24 is connected to the light-emitting element mounting pad portion of the wiring pattern of the substrate 23 by soldering, and emits light from the light-emitting surface when lighting power is supplied from the power supply unit through the wiring pattern. Preferably, the light-emitting element 24 has a lens portion disposed on the light-emitting surface. Alternatively, the resin material that is the sealing member of the light-emitting element 24 may be made convex in the direction of light irradiation to form a lens portion, thereby functioning as a lens portion.

[0026] The light-emitting elements 24 are mounted within a predetermined mounting area from opposite sides 26a and 26b of the substrate 23 via vertex P1. A predetermined number of light-emitting elements 24 are arranged at the same pitch in a direction parallel to the first opposite side 26a from the second opposite side 26b of the substrate 23, and a predetermined number of light-emitting elements 24 are also arranged at the same pitch in a direction parallel to the second opposite side 26b from the first opposite side 26a of the substrate 23, so that multiple light-emitting elements 24 are arranged within a roughly diamond-shaped mounting area. A connector mounting space 29 for mounting a connector 25 is formed between the light-emitting elements 24 arranged in the outermost row of the mounting area furthest from each opposite side 26a and 26b and the areas at both ends of each non-opposite side 27a and 27b and the third non-opposite side 27c.

[0027] As shown in Figure 2, in the state of the substrate assembly formed by combining three substrates 23, the mounting areas of the three substrates 23 combine to form a regular hexagonal mounting area, and multiple light-emitting elements 24 are arranged in this regular hexagonal mounting area. The regular hexagon of the substrate assembly formed by the three substrates 23 and the regular hexagon of the three combined mounting areas are offset by 60 degrees in the circumferential direction around the center point O, thereby forming a wiring space 28.

[0028] The light-emitting elements 24 are arranged such that three adjacent light-emitting elements 24 are located at each vertex of an equilateral triangle, and up to six light-emitting elements 24 are adjacent to one light-emitting element 24, with these six light-emitting elements 24 located at each vertex of a regular hexagon.

[0029] The light-emitting element 24 includes a light-emitting element 24 arranged in a first orientation in which one side of the rectangular outer shape is parallel to the first opposing side portion 26a of the substrate 23, and a light-emitting element 24 arranged in a second orientation in which one side of the rectangular outer shape is parallel to the second opposing side portion 26b. The light-emitting element 24 in the second orientation is arranged only in the row closest to the second opposing side portion 26b, and all remaining positions are filled with light-emitting elements 24 in the first orientation.

[0030] A light-emitting element 24 arranged in a second orientation on the second opposing edge 26b side of one substrate 23 will have the same orientation as a light-emitting element 24 arranged in a first orientation on the first opposing edge 26a side of another adjacent substrate 23. This creates an arrangement where the light-emitting element 24 arranged in the first orientation at the position closest to the first opposing edge 26a of the other adjacent substrate 23 and the three adjacent light-emitting elements 24 described above are positioned at the vertices of an equilateral triangle. Similarly, a light-emitting element 24 arranged in a first orientation at the position closest to the first opposing edge 26a of one substrate 23 will have an arrangement where the light-emitting element 24 arranged in a second orientation on another adjacent substrate 23 and the three adjacent light-emitting elements 24 described above are positioned at the vertices of an equilateral triangle. As a result, all light-emitting elements 24 arranged within the regular hexagonal mounting area are arranged in the above-described arrangement.

[0031] The light-emitting element 24 can be a combination of non-phosphor light-emitting elements that do not contain phosphors, such as primary colors like red, green, and blue, or light colors like cyan, and phosphor-containing light-emitting elements that contain phosphors, such as white, amber, bright green, yellow, or bluish-green mint.

[0032] Examples of non-phosphor light-emitting devices include red light-emitting devices that emit light with a peak wavelength of approximately 610 nm or more and approximately 670 nm or less, green light-emitting devices that emit light with a peak wavelength of approximately 505 nm or more and approximately 540 nm or less, blue light-emitting devices that emit light with a peak wavelength of approximately 430 nm or more and approximately 470 nm or less, and cyan light-emitting devices that emit light with a peak wavelength of approximately 480 nm or more and approximately 500 nm or less.

[0033] Examples of phosphor-emitting light-emitting devices include a white light-emitting device that emits white light, comprising a light-emitting diode that emits blue light with a peak wavelength of approximately 440 nm and a phosphor that emits yellow fluorescence covering the light-emitting surface of the light-emitting diode; an amber light-emitting device that emits amber light with a peak wavelength of approximately 610 nm, comprising a light-emitting diode that emits blue light with a peak wavelength of approximately 440 nm and a phosphor that emits yellow and red fluorescence covering the light-emitting surface of the light-emitting diode; and a mint-colored light-emitting device that emits mint light with a peak wavelength of approximately 550 nm, comprising a light-emitting diode that emits blue light with a peak wavelength of approximately 440 nm and a phosphor that emits yellow and green fluorescence covering the light-emitting surface of the light-emitting diode.

[0034] Each light-emitting element 24 of a specific color is positioned at various locations on the substrate 23, taking into consideration color mixing properties. Furthermore, only phosphor-emitting elements are positioned at the outermost periphery of the mounting area opposite the non-opposing edges 27a, 27b, and 27c of the substrate 23; no non-phosphor-emitting elements are positioned there. As a result, as shown in Figure 2, only phosphor-emitting elements are positioned at the outermost periphery of the hexagonal mounting area on which the light-emitting elements 24 are mounted; no non-phosphor-emitting elements are positioned there. In addition, non-phosphor-emitting elements such as primary-color red, green, and blue light-emitting elements, which do not contain phosphors, are positioned so as not to be adjacent to each other.

[0035] Furthermore, the multiple light-emitting elements 24 may be either light-emitting elements 24 that emit light of a single color, or multi-color light-emitting elements 24 that can individually emit multiple colors of light as described above.

[0036] Furthermore, two connectors 25 are used for input and output, and are connected by soldering to a pair of connector mounting pads on the wiring pattern of the circuit board 23.

[0037] The connectors 25 are positioned on the non-opposite sides 27a and 27b adjacent to the opposing sides 26a and 26b. These non-opposite sides 27a and 27b are located closer to the non-opposite sides 27a and 27b than to the opposing sides 26a and 26b. The connectors 25 are positioned in the connector placement space 29 between the light-emitting elements 24, which are arranged in the outermost row of the mounting area away from the opposing sides 26a and 26b of the substrate 23, and the non-opposite sides 27a and 27b.

[0038] The connector 25 includes a first connector 25a disposed on the first non-opposite side 27a of the substrate 23, and a second connector 25b disposed on the second non-opposite side 27b of the substrate 23. For example, the first connector 25a is connected to the anode side of the light-emitting element 24, and the second connector 25b is connected to the cathode side of the light-emitting element 24. Alternatively, the first connector 25a may be connected to the cathode side, and the second connector 25b may be connected to the anode side.

[0039] The connector 25 is, for example, a female connector and has a concave connector connection surface into which a corresponding male connector is inserted and connected. When viewed from the front of the substrate 23, the connector 25 is formed in a rectangle with one connector connection surface being the longer side, and the connector connection surface side is positioned facing outward, opposite the non-opposing sides 27a and 27b of the substrate 23. Inside the connector connection surface of the connector 25, a plurality of connector terminals are arranged in the longitudinal direction of the connector 25, each connected to the wiring portion of the wiring pattern for each type of light-emitting element 24.

[0040] Furthermore, the light source device 12 is electrically connected to the power supply unit by a pair of power connection wiring members 31, and the first light source module 22a and the second light source module 22b, and the second light source module 22b and the third light source module 22c are electrically connected by board-to-board connection wiring members 32. These wiring members 31 and 32 connect the three light source modules 22a, 22b, and 22c in series to the power supply unit.

[0041] The wiring member 31 for power connection comprises a wire 33 and a pair of connectors 34 provided at both ends of the wire 33 (Figure 2 shows only the connector 34 connected to the light source device 12). The wire 33 may use multiple wires corresponding to the number of different types of light-emitting elements 24, or it may use a flexible wiring cable. The connectors 34 are male connectors and are electrically connected by being inserted into the connector 25 from the outside of the non-opposing sides 27a and 27b of the substrate 23.

[0042] A pair of power supply wiring members 31 are used and are connected to a first connector 25a located on the first non-opposing side portion 27a of the first light source module 22a, which faces the second side 20b, the lower edge of the substrate mounting surface 20 of the heat sink 11, and to a second connector 25b located on the second non-opposing side portion 27b of the third light source module 22c. The power supply wiring members 31 are wired from the light source device 12 toward the bottom of the heat sink 11 and connected to a power supply unit located on the lower side of the housing of the lighting device 10.

[0043] The wiring member 32 for inter-board connection comprises a wire 35 and a pair of connectors 36 provided at both ends of the wire 35. The wire 35 may use multiple wires corresponding to the number of different types of light-emitting elements 24, or it may use a flexible wiring cable or the like. The connectors 36 are male connectors and are electrically connected by being inserted into the connectors 25 from the outside of the non-opposing sides 27a and 27b of the board 23.

[0044] The wiring member 32 for inter-board connection has one end connected to a connector 25 located on one board 23, and the other end connected to a connector 25 located on a different board 23.

[0045] In one lighting device 10, two wiring members 32 are used for inter-substrate connection. One wiring member 32 connects the second connector 25b located on the second non-opposite side 27b of the first light source module 22a to the first connector 25a located on the first non-opposite side 27a of the second light source module 22b. The other wiring member 32 connects the second connector 25b located on the second non-opposite side 27b of the second light source module 22b to the first connector 25a located on the first non-opposite side 27a of the third light source module 22c. These wiring members 32 connect the wiring sections of each type of light-emitting element 24 on adjacent substrates 23 in series.

[0046] As shown in Figure 2, the wiring member 32 for inter-board connection is positioned within the area of ​​the light source mounting surface 20 when viewed from the front side, which is the direction facing the light source mounting surface 20 of the heat sink 11. Specifically, it is positioned in the wiring space 28 between the second non-opposing side portion 27b of the first light source module 22a and the corner area formed by the first side 20a and the third side 20c of the light source mounting surface 20 of the heat sink 11. Furthermore, it is positioned in the wiring space 28 between the second non-opposing side portion 27b of the second light source module 22b and the first non-opposing side portion 27a of the third light source module 22c and the corner area formed by the first side 20a and the fourth side 20d of the light source mounting surface 20 of the heat sink 11. Therefore, the wiring member 32 does not protrude outward from the wiring space 28 or the light source mounting surface 20 of the heat sink 11.

[0047] In the lighting device 10, the power supply unit supplies lighting power to the light source modules 22a, 22b, and 22c of the light source device 12 through wiring members 31 and 32 for each type of light source 24 according to the color of light to be projected, thereby lighting the light source 24. The light from the lit light source 24 is incident on the effective area of ​​the diffuser plate 13 facing the aperture 14, and the light of each color is mixed by the diffuser plate 13 to generate a pseudo-light source, and the light from this pseudo-light source generated by the diffuser plate 13 is projected onto the illumination surface by the projection lens 16.

[0048] In the light source device 12, light from the light-emitting element 24 located at the outermost edge of the mounting area of ​​the light-emitting element 24 is not mixed with the light from the light-emitting element 24 located inside the outermost edge of the mounting area of ​​the light-emitting element 24, and is projected without being mixed. Therefore, if non-phosphor light-emitting elements such as primary color red light-emitting elements, green light-emitting elements, and blue light-emitting elements that do not contain phosphors are located at the outermost edge of the mounting area of ​​the light-emitting element 24, light from non-phosphor light-emitting elements such as primary color red light-emitting elements, green light-emitting elements, and blue light-emitting elements that do not contain phosphors, which are easily perceived as color unevenness, will be projected without being mixed, and optical properties such as color reproduction, color unevenness, and brightness unevenness will be impaired.

[0049] In the light source device 12 of this embodiment, only phosphor-containing light-emitting elements are placed at the outermost periphery of the mounting area of ​​the light-emitting element 24, while non-phosphor-containing light-emitting elements such as primary-color red light-emitting elements, green light-emitting elements, and blue light-emitting elements that do not contain phosphors are placed at mounting positions inward from the outermost periphery of the mounting area of ​​the light-emitting element 24.

[0050] In this way, by not arranging non-phosphor light-emitting elements such as primary-color red, green, and blue light-emitting elements that do not contain phosphors at the outermost periphery of the mounting area of ​​the light-emitting element 24, it is possible to prevent light from these non-phosphor light-emitting elements from being projected by the diffuser plate 13 without being mixed, thereby improving optical characteristics such as color reproducibility, color unevenness, and brightness unevenness.

[0051] Furthermore, when primary color red light-emitting elements, green light-emitting elements, and blue light-emitting elements are arranged adjacent to each other, the difference in chromaticity between these primary color red, green, and blue light-emitting elements is larger than the difference in chromaticity between non-phosphor light-emitting elements and phosphor light-emitting elements. As a result, the light is not mixed by the diffuser plate 13, and this is easily perceived as color unevenness.

[0052] In the light source device 12 of this embodiment, the red light-emitting element, the green light-emitting element, and the blue light-emitting element are arranged in positions that are not adjacent to each other. That is, the red light-emitting element, the green light-emitting element, and the blue light-emitting element are each placed between phosphor light-emitting elements where the difference in chromaticity with the light-emitting element 24 is small.

[0053] This reduces the difference in chromaticity between adjacent light-emitting elements 24, allowing for better color mixing in the diffuser plate 13 and reducing color unevenness.

[0054] Furthermore, the heat generated when the light-emitting element 24 is lit is transferred from the substrate 23 to the heat sink 11 for heat dissipation.

[0055] In this case, if the substrate 23 of the light source device 12 is made of a single large substrate, the displacement of the substrate 23, such as warping or bending due to the heat generated by the light-emitting element 24, will have a significant effect, and there is a risk that cracks may occur at the soldering points of the light-emitting element 24 and other components mounted on the substrate 23.

[0056] In the light source device 12 of this embodiment, multiple substrates 23 are assembled to form a single substrate assembly. This makes it possible to make the size of each of the multiple substrates 23 smaller than that of a single substrate, thereby reducing the effects of displacement such as warping or bending of the substrate 23 due to the heat generated by the light-emitting element 24, and suppressing the occurrence of cracks at the soldering points of the light-emitting element 24 and other components mounted on the substrate 23.

[0057] Furthermore, in the light source device 12 of this embodiment, since the connector 25 is arranged on the non-opposite side 27 of the substrate 23, even when multiple substrates 23 are assembled to form a single substrate assembly, there is a high degree of freedom in wiring to the connector 25, making it easy to wire the wiring member 31 that connects to the power supply unit and the wiring member 32 that connects between the substrates 23, and also preventing the wiring members 31 and 32 from blocking the light from the light-emitting element 24.

[0058] Furthermore, since the light-emitting element 24 includes a light-emitting element 24 arranged in a first orientation in which one side of the rectangular outer shape is parallel to the first opposing side portion 26a of the substrate 23, and a light-emitting element 24 arranged in a second orientation in which one side of the rectangular outer shape is parallel to the second opposing side portion 26b, the first opposing side portion 26a and the second opposing side portion 26b of adjacent substrates 23 face each other, the orientation of adjacent light-emitting elements 24 can be aligned between adjacent substrates 23, and changes in optical characteristics at the joints between substrates 23 can be suppressed.

[0059] Furthermore, since the second orientation light-emitting element 24 is arranged only in the row closest to the second opposing edge portion 26b, and the remaining positions are all occupied by the first orientation light-emitting element 24, the orientation and positional relationship of adjacent light-emitting elements 24 can be easily matched between adjacent substrates 23, thereby suppressing changes in optical characteristics at the joints between substrates 23.

[0060] Furthermore, the lighting device 10 can change the range of light emitted by moving the light source unit 17 forward or backward via the moving mechanism 18, thereby changing the distance between the diffuser plate 13 that generates the pseudo-light source and the projection lens 16.

[0061] In this configuration, the wiring members 32 connecting the substrates 23 are positioned within the area of ​​the light source mounting surface 20 of the heat sink 11 when viewed from the front facing the light source mounting surface 20 of the heat sink 11. They do not protrude outward from the wiring space 28 or the light source mounting surface 20 of the heat sink 11. Therefore, even if the light source unit 17 moves, the wiring members 32 will not get caught on other components, thus not hindering the movement of the light source unit 17 and suppressing the occurrence of electrical disconnections and other problems.

[0062] With respect to the wiring members 32 connecting the substrates 23, as shown in Figures 4(a) to (g) (Figures 4(a) to (g) show schematic front views illustrating the relationship between the outline of the light source device 12 and the virtual rectangle 40), if we define a virtual rectangle 40 that encompasses the light source device 12 in a front view and has an area larger than the sum of the front areas of the substrates 23 of the light source device 12, and where at least one side of the virtual rectangle 40 coincides with a vertex or side of the outline of the light source device 12, then the wiring members 32 are routed into a region 41 (wiring space 28) enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40. Here, "route" means that at least a part of the wiring members 32 is located within the region 41. It is preferable that all of the wiring members 32 are located within the region 41. In this case, the dividing section between adjacent substrates 23 is positioned corresponding to the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40, so that the wiring member 32 connecting the substrates 23 is routed into the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40.

[0063] Figure 4(a) shows the case where the outline of the light source device 12 is triangular, where one side of the virtual rectangle 40 coincides with one side of the outline of the light source device 12, and the other side of the virtual rectangle 40 opposite to that side coincides with one vertex of the outline of the light source device 12. Due to this relationship, the wiring member 32 is routed into the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40. Note that "coincidence" here includes configurations where the sides of the virtual rectangle 40 coincide with the sides of the outline of the light source device 12, as well as configurations where at least a part of the sides of the virtual rectangle 40 coincides with a side or vertex of the outline of the light source device 12. The same applies hereafter.

[0064] Figure 4(b) shows the case where the outer shape of the light source device 12 is a rectangle, and all sides of the virtual rectangle 40 overlap with one different vertex of the outer shape of the light source device 12 (provided that the area of ​​the virtual rectangle > the area of ​​the light source device 12). Due to this relationship, the wiring member 32 is routed into the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40.

[0065] Figure 4(c) shows the case where the outer shape of the light source device 12 is a pentagon, where one side of the virtual rectangle 40 overlaps with one side of the outer shape of the light source device 12, and the other three sides of the virtual rectangle 40 each overlap with one different vertex of the outer shape of the light source device 12. Due to this relationship, the wiring member 32 is routed into the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40.

[0066] If the outline of the light source device 12 is an odd-numbered polygon (2 × n + 1 (n = an integer greater than or equal to 2)) with five or more sides, for example, a heptagon, nonagon, eleven-sided polygon, etc., the relationship is the same as that of the pentagon shown in Figure 4(c). However, the other three sides of the virtual rectangle 40 each overlap with one different vertex of the outline of the light source device 12. In other words, in this case, the light source device 12 has an outline that includes vertices that do not overlap with the sides of the virtual rectangle 40.

[0067] Figure 4(d) shows the case where the outer shape of the light source device 12 is hexagonal, as in the embodiment described above. The two opposing sides of the virtual rectangle 40, one above and one below, each overlap with one different side of the outer shape of the light source device 12, and the other two opposing sides of the virtual rectangle 40, one different vertex of the outer shape of the light source device 12, each overlap with one vertex. Due to this relationship, the wiring member 32 is routed into the region 41 enclosed by the non-opposing side portion 27 of the light source device 12 and the virtual rectangle 40.

[0068] Furthermore, if the outer shape of the light source device 12 is an even-numbered polygon with hexagons or more, and is an N(6+4n (n=1 or greater integer)) polygon, for example a decagon, 14-sided polygon, 18-sided polygon, etc., the relationship will be the same as that of the hexagon shown in Figure 4(d). In this case as well, the light source device 12 will have a configuration in which the vertices do not overlap with the sides of the virtual rectangle 40.

[0069] For example, Figure 4(e) shows the case where the outline of the light source device 12 is a decagon, where the two opposing sides of the virtual rectangle 40, one on the top and one on the bottom, each coincide with one different side of the outline of the light source device 12, and the other two opposing sides of the virtual rectangle 40, one on the left and one on the right, each coincide with one different vertex of the outline of the light source device 12.

[0070] If the outline of the light source device 12 is an N(6+4n (n=1 or greater integer)) polygon, then two opposing sides, one above and one below, will overlap with two opposing sides of the virtual rectangle 40. Therefore, the number of remaining sides is N-2, and the number of sides (N / 2-1) on the left and right sides of the outline of the light source device 12 will be equal. If the value of the number of sides (N / 2-1) on the left and right sides of the outline of the light source device 12 is even, then the sides on the left and right sides of the outline of the light source device 12 will not overlap with opposing sides of the virtual rectangle 40.

[0071] Furthermore, Figure 4(f) shows the case where the outer shape of the light source device 12 is octagonal, and the four sides of the virtual rectangle 40 each overlap with one side of the outer shape of the light source device 12. Due to this relationship, the wiring member 32 is routed into the region 41 enclosed by the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40.

[0072] If the outer shape of the light source device 12 is an even-numbered polygon with 6 or more sides, and is a (6 × 4n-2 (n=1 or greater integer)) polygon, for example an octagon, dodecagon, hexagon, etc., the relationship is the same as that of the octagon shown in Figure 4(f).

[0073] For example, Figure 4(g) shows the case where the outline of the light source device 12 is a dodecagon, and the four sides of the virtual rectangle 40 each overlap with one different side of the outline of the light source device 12.

[0074] Thus, if a virtual rectangle 40 is defined that encompasses the light source device 12 in a front view and has an area larger than the sum of the front areas of the substrates 23 of the light source device 12, and at least one side of the virtual rectangle 40 overlaps with a vertex or edge of the outer shape of the light source device 12, then the wiring member 32 is routed to an area 41 (wiring space 28) enclosed by at least the non-opposite side portion 27 of the light source device 12 and the virtual rectangle 40, thereby increasing the degree of freedom in routing the wiring member 32 connecting the substrates 23. It is desirable that the virtual rectangle 40 be configured to have the smallest area while satisfying the conditions that it encompasses the light source device 12, has an area larger than the sum of the front areas of the substrates 23 of the light source device 12, and at least one side of the virtual rectangle 40 overlaps with a vertex or edge of the outer shape of the light source device 12.

[0075] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0076] 10 Lighting devices 11 Heat sink 12 Light source device 17 Light source section 20 Light source mounting surface 23 circuit boards 24 Light-emitting elements 25 connectors 26 Opposite sides 26a First opposite side 26b Second opposite side 27 Non-opposite edges 32 Wiring components 40 virtual rectangles 41 areas

Claims

[Claim 1] Multiple substrates; Each of the aforementioned multiple substrates is equipped with a plurality of light-emitting elements; Each of the aforementioned multiple circuit boards has a connector; A wiring member having one end connected to the connector disposed on one circuit board, and the other end connected to the connector disposed on a circuit board different from the first circuit board; Equipped with, Each of the aforementioned substrates has, in its peripheral portion, an opposing edge portion that faces another substrate and a non-opposing edge portion that does not face another substrate. The connector is disposed on the non-opposite side of the substrate. A light source device characterized by the following features.

Images