Light source module and lighting device

Abstract

To provide a light source module which can improve optical characteristics.SOLUTION: A light source module 10 comprises a plurality of kinds of light emitting elements 12 comprising a red light emitting element 12r, a green light emitting element 12g, and a blue light emitting element 12b containing no phosphor, a first phosphor light emitting element 12m containing the phosphor, and a second phosphor light emitting element 12a which radiates light in a color different from that of the first phosphor light emitting element 12m. When the maximum number of the light emitting elements 12 adjacent to one light emitting element 12 is considered N in the light source module 10, only the first phosphor light emitting element 12m or the second phosphor light emitting element 12a is arranged at a position where the number of the adjacent light emitting elements 12 becomes N-1 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] 2. Description of the Related Art Conventionally, there are light source modules that include a plurality of types of light emitting elements that emit light of different colors. This light source module can produce a wide range of colors on the chromaticity coordinates by controlling the on / off of light-emitting elements for each color.

[0003] In this light source module, if multiple types of light-emitting elements, including light-emitting elements using phosphors, are simply arranged in a dispersed manner, short-wavelength light emitted from adjacent light-emitting elements may be incident on the phosphors, causing unintended fluorescence and reducing color reproducibility, which may result in reduced optical characteristics.On the other hand, if the light source module is simply divided into areas where multiple types of light-emitting elements are arranged, the light from each area may be irradiated directly onto the irradiation surface without being mixed, causing color unevenness and brightness unevenness, which may result in reduced optical characteristics. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6784046 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a light source module and a lighting device that can improve optical characteristics. [Means for solving the problem]

[0006] The light source module of the embodiment includes a mounting area in which multiple types of light emitting elements are mounted, including red, green, and blue light emitting elements that do not contain phosphor, and first phosphor light emitting elements that contain phosphor and second phosphor light emitting elements that emit light of a color different from that of the first phosphor light emitting elements. In positions in the mounting area where the number of adjacent light emitting elements is four or less, only the first phosphor light emitting elements or the second phosphor light emitting elements are arranged. [Effects of the Invention]

[0007] According to the light source module of the embodiment, the optical characteristics can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a light source module showing an embodiment. [Figure 2] 2 is a schematic diagram of a lighting device including the same light source module. FIG. [Figure 3] FIG. 2 is a perspective view of a lens of the same lighting device. DETAILED DESCRIPTION OF THE INVENTION

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

[0010] 1 is a schematic diagram of a light source module 10. The light source module 10 includes a substrate 11 and a plurality of types of light emitting elements 12 mounted on the substrate 11.

[0011] The substrate 11 is rectangular and plate-like. The shape of the substrate 11 may be polygonal or circular, other than rectangular. The substrate 11 is a single-layer substrate or a single-sided substrate, and has a base substrate formed of a metal material or an inorganic material such as ceramics (e.g., aluminum oxide or aluminum nitride). An insulating layer is formed on one surface of the base substrate, and a wiring pattern is formed on the insulating layer. The wiring pattern includes a plurality of mounting pads for mounting each light-emitting element 12, and wiring portions that connect the mounting pads for each type of light-emitting element 12 in series or series-parallel and are connected to input terminal portions provided on the periphery of one surface of the substrate 11. The wiring portions are routed between the plurality of mounting pads and along the periphery of the substrate 11, but there are intersections where some of the wiring portions intersect. At these intersections, upper-layer wiring portions are provided that intersect with a jumper insulating layer provided on the lower-layer wiring portions, thereby insulating the wiring portions from each other.

[0012] The light-emitting elements 12 mounted on the substrate 11 are arranged linearly at a predetermined pitch in the horizontal direction, which is the first direction of the substrate 11, within a mounting range in which the outer shape of the light-emitting region formed by each light-emitting element 12 is approximately hexagonal, and are also arranged at a predetermined pitch in the vertical direction, which is the second direction intersecting the first direction of the substrate 11, with the light-emitting elements 12 being shifted by half a pitch in the horizontal direction from adjacent light-emitting elements 12 in the vertical direction. The predetermined pitch in the first direction and the predetermined pitch in the second direction for mounting the light-emitting elements 12 are approximately equal.

[0013] The light emitting elements 12 may be, for example, SMD (Surface Mount Device) package type or CSP (Chip Scale Package) type light emitting elements, which are connected by soldering to mounting pads of the wiring pattern on the substrate 11 and emit light using lighting power supplied through the wiring pattern. Wiring portions of the wiring pattern are arranged along the spaces between the light emitting elements 12 mounted on the substrate 11. It is preferable that the light emitting elements 12 have a lens disposed on the light emitting surface. Note that the resin material that seals the light emitting elements 12 may be formed into a convex shape so as to form a lens in the light emitting direction, thereby allowing the light emitting elements 12 to function like a lens.

[0014] The light-emitting elements 12 include red light-emitting elements 12r, green light-emitting elements 12g, and blue light-emitting elements 12b that do not contain phosphor, and a first phosphor light-emitting element 12m that is a light-emitting element 12 that contains phosphor, and a second phosphor light-emitting element 12a that emits light of a color different from that of the first phosphor light-emitting element 12m. In addition to these, the light-emitting elements 12 may include light-emitting elements 12 that contain phosphors and emit light of other colors, including cyan that does not contain phosphors, and light-emitting elements 12 that do not contain phosphors.

[0015] The red light emitting element 12r emits red light, which is a primary color. For example, a light emitting diode that emits light with a peak wavelength of 610 nm or more and 670 nm or less can be used as the red light emitting element 12r.

[0016] The green light emitting element 12g emits green light, which is a primary color, and may be, for example, a light emitting diode that emits light with a peak wavelength exceeding 505 nm and not exceeding 540 nm.

[0017] The blue light emitting element 12b emits light of a blue primary color, and may be, for example, a light emitting diode that emits light with a peak wavelength of 430 nm or more and 470 nm or less.

[0018] The first phosphor light-emitting element 12m emits mint-colored light, which is bright green or bluish green. The first phosphor light-emitting element 12m includes, for example, a light-emitting diode that emits bluish light with a peak wavelength of approximately 440 nm and a phosphor that emits yellowish and greenish fluorescence and is provided adjacent to the light-emitting surface of the light-emitting diode, and can emit mint-colored light with a peak wavelength of approximately 550 nm.

[0019] The second phosphor light emitting element 12a emits amber light. The second phosphor light emitting element 12a includes, for example, 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 and is provided adjacent to the light emitting surface of the light emitting diode, and can emit amber light with a peak wavelength of approximately 610 nm.

[0020] In this embodiment, in a chromaticity diagram of an xy coordinate system, the chromaticity coordinates of red light-emitting element 12r are approximately (x, y) = (0.72, 0.28), the chromaticity coordinates of green light-emitting element 12g are approximately (x, y) = (0.16, 0.72), and the chromaticity coordinates of blue light-emitting element 12b are approximately (x, y) = (0.14, 0.06). The chromaticity coordinates of the light emitted by first phosphor light-emitting element 12m are approximately (x, y) = (0.38, 0.47) and are located inside the triangular region connecting the chromaticity coordinates of the light emitted by red light-emitting element 12r, the chromaticity coordinates of the light emitted by green light-emitting element 12g, and the chromaticity coordinates of the light emitted by blue light-emitting element 12b. The chromaticity coordinates of the light emitted by second phosphor light-emitting element 12a are approximately (x, y) = (0.56, 0.42) and are located outside the triangular region.

[0021] Furthermore, the light-emitting element 12 may include a cyan light-emitting element (not shown in Fig. 1) that does not include a phosphor. The cyan light-emitting element may be, for example, a light-emitting diode that emits light with a peak wavelength of 480 nm or more and 500 nm or less. The chromaticity coordinates of the light emitted by the cyan light-emitting element are (x, y) = (0.09, 0.23), which is outside the triangular region described above.

[0022] The mounting positions of the plurality of types of light emitting elements 12 mounted on the substrate 11 have the following regularity.

[0023] When the maximum number of light-emitting elements 12 adjacent to one light-emitting element 12 (adjacent light-emitting elements 12 refer to any light-emitting element 12 whose center-to-center distance is X, where X is the center-to-center distance between two light-emitting elements 12 with the shortest center-to-center distance in the light source module 10) is N (in this embodiment, the center-to-center distances of all light-emitting elements 12 in the light source module 10 are equal, so the maximum number of adjacent light-emitting elements 12 is 6), the first phosphor light-emitting element 12m or the second phosphor light-emitting element 12a is arranged at a position where the number of adjacent light-emitting elements 12 is N-1 or less (6-1=5 in this embodiment). For example, the mounting positions at the outermost periphery of the mounting area of ​​the light-emitting elements 12 are positions where the number of adjacent light-emitting elements 12 is 3 or 4, which is N-1 or less (6-1=5 in this embodiment), so only the first phosphor light-emitting element 12m or the second phosphor light-emitting element 12a is arranged at the outermost periphery of the mounting area of ​​the light-emitting elements 12. Furthermore, even inside the mounting area of ​​the light-emitting elements 12, it is preferable to place only the first phosphor light-emitting element 12m or the second phosphor light-emitting element 12a in positions where no light-emitting elements 12 are placed, such as around screw holes, and the number of adjacent light-emitting elements 12 is N-1 (6-1=5 in this embodiment) or less.

[0024] The primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are not arranged at the center of the mounting area of ​​the light emitting element 12 and at a position adjacent to this center, but the first phosphor light emitting element 12m or the second phosphor light emitting element 12a is arranged.

[0025] The primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged only at positions where the number of adjacent light emitting elements 12 is N (six in this embodiment). That is, since the mounting positions inside the outermost periphery of the mounting area of ​​the light emitting elements 12 are positions where the number of adjacent light emitting elements 12 is N (six in this embodiment), the red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged only at mounting positions inside the outermost periphery of the mounting area of ​​the light emitting elements 12. Note that the first phosphor light emitting element 12m and the second phosphor light emitting element 12a may be arranged at positions where the number of adjacent light emitting elements 12 is N (six in this embodiment).

[0026] The red light emitting element 12r, the green light emitting element 12g, and the blue light emitting element 12b are arranged at positions that are not adjacent to light emitting elements 12 of different primary colors, respectively. That is, the red light emitting element 12r, the green light emitting element 12g, and the blue light emitting element 12b are arranged at positions with the first phosphor light emitting element 12m or the second phosphor light emitting element 12a interposed therebetween.

[0027] Furthermore, when cyan light-emitting elements are used as the light-emitting elements 12 of the light source module 10, the blue light-emitting elements 12b and the cyan light-emitting elements are arranged in positions where three or more of them are not adjacent to each other. In other words, it is fine to arrange one blue light-emitting element 12b and one cyan light-emitting element adjacent to each other, but two or more blue light-emitting elements 12b (cyan light-emitting elements) and one or more cyan light-emitting elements (blue light-emitting elements 12b) are arranged so that they are not adjacent to each other. This is because the distance between the blue light-emitting elements 12b and the cyan light-emitting elements on the chromaticity coordinates is short, and if three or more of them are adjacent to each other, blue lines will appear as color unevenness in the light emitted from the light source module 11.

[0028] Next, FIG. 2 shows a schematic diagram of a lighting device 20 equipped with the light source module 10. As shown in FIG.

[0029] The lighting device 20 is, for example, a projector that projects light. The lighting device 20 includes a light source module 10, a heat sink 21 to which the light source module 10 is attached, a collimator lens 23 and a condenser lens 24 that are lenses 22 that control the light emitted from the light source module 10, a diffusion plate 25 that diffuses the light controlled by the lens 22, an aperture body 27 having an aperture 26 through which the light controlled by the lens 22 passes, a projection lens 28 that projects the light that has passed through the aperture 26, and a power supply unit that turns on the light source module 10.

[0030] The heat sink 21 is made of, for example, a metal having excellent thermal conductivity and heat dissipation properties, and may be provided with a heat dissipation structure such as heat dissipation fins. The rear side of the substrate 11 of the light source module 10 is thermally connected to and attached to the front side of the heat sink 21.

[0031] 2 and 3, the collimator lens 23 is integrally formed and includes a plurality of lens portions 30 facing the respective light-emitting elements 12 and a connecting portion 31 connecting the front ends of the lens portions 30. Each lens portion 30 has a recess 32 for accommodating the light-emitting element 12, and an incident surface onto which light from the light-emitting element 12 is incident is formed on the inner surface of the recess 32. An exit surface from which incident light exits is formed on the front side of each lens portion 30, and a reflecting surface is formed between the entrance surface and the exit surface to reflect the incident light toward the exit surface. The lens portion 30 emits light from the light-emitting element 12 that is incident on the entrance surface from the exit surface as parallel light perpendicular to the exit surface.

[0032] The collimator lens 23 is positioned and attached to the substrate 11, so that the positional relationship between each light-emitting element 12 and each lens portion 30 is constant, thereby stabilizing the optical characteristics. As shown in Fig. 3, on the back side of the collimator lens 23, a plurality of attachment bosses, or attachment portions 33, are protruded from a connecting portion 31, and these attachment portions 33 are positioned and attached by being inserted into a plurality of attachment holes provided in the substrate 11.

[0033] The condenser lens 24 condenses the light emitted from the collimator lens 23 .

[0034] The diffusion plate 25 receives the light condensed by the condenser lens 24, and diffuses and mixes the colors.

[0035] Aperture body 27 blocks light that spreads around it and transmits light that corresponds to the shape of aperture 26. Aperture 26 is provided to be smaller than the size of substrate 11 and the size of the mounting area for light emitting element 12.

[0036] The projection lens 28 projects the light that has passed through the aperture 26 .

[0037] The power supply unit supplies lighting power to the light emitting elements 12 for each color of the light source module 10 in accordance with the color of the light to be projected, thereby lighting them up.

[0038] In the lighting device 20, the light-emitting elements 12 of each color are turned on according to the color of light to be projected, and the light from the turned-on light-emitting elements 12 is converted into parallel light by a collimator lens 23 and emitted, and is then focused by a condenser lens 24 toward an aperture 26, and the colors are mixed by a diffuser plate 25 just before the aperture 26, and the light that has passed through the aperture 26 is projected by a projection lens 28.

[0039] In the lighting device 20 that projects this light, light from the light emitting elements 12 arranged at the outermost periphery of the mounting area of ​​the light source module 10 is likely to be projected without being mixed, since only light from light emitting elements 12 arranged inside the outermost periphery of the mounting area of ​​the light emitting elements 12 is mixed by the diffuser 25. Therefore, when the primary color elements red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged at the outermost periphery of the mounting area of ​​the light emitting elements 12, the light from the primary color elements red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b, which are likely to be recognized as color unevenness, is projected without being mixed, impairing optical characteristics such as color reproducibility, color unevenness, and brightness unevenness.

[0040] In this embodiment, when the maximum number of light-emitting elements 12 adjacent to one light-emitting element 12 is N (6 in this embodiment), the first phosphor light-emitting element 12m or the second phosphor light-emitting element 12a is arranged at a position where the number of adjacent light-emitting elements 12 is N-1 or less (6-1=5 in this embodiment). That is, the mounting positions at the outermost periphery of the mounting area of ​​the light-emitting elements 12 are positions where the number of adjacent light-emitting elements 12 is 3 or 4, which is N-1 or less (6-1=5 in this embodiment), and therefore the first phosphor light-emitting element 12m or the second phosphor light-emitting element 12a is arranged at the outermost periphery of the mounting area of ​​the light-emitting elements 12.

[0041] Furthermore, the primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged only at positions where the number of adjacent light emitting elements 12 is N (six in this embodiment). That is, the mounting positions inside the outermost periphery of the mounting area of ​​the light emitting elements 12 are positions where the number of adjacent light emitting elements 12 is N (six in this embodiment), so the red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged only at mounting positions inside the outermost periphery of the mounting area of ​​the light emitting elements 12.

[0042] Therefore, since the primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are not arranged at the outermost periphery of the mounting area of ​​the light emitting element 12, it is possible to prevent the light from these primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b from being projected without being mixed by the diffuser plate 25, thereby improving optical characteristics such as color reproducibility, color unevenness, and brightness unevenness.

[0043] Furthermore, even inside the mounting area for light-emitting elements 12, if there are positions where no light-emitting elements 12 are arranged and the number of adjacent light-emitting elements 12 is N-1 (6-1=5 in this embodiment) or less, it is preferable to arrange first phosphor light-emitting element 12m or second phosphor light-emitting element 12a at those positions. In this case, too, it is possible to prevent light from primary color red light-emitting element 12r, green light-emitting element 12g, and blue light-emitting element 12b from being projected without being mixed by diffuser plate 25, thereby improving optical characteristics such as color reproducibility, color unevenness, and brightness unevenness.

[0044] Furthermore, in the lighting device 20 that projects this light, when the primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b are arranged adjacent to each other in the light source module 10, the difference in chromaticity between these primary color red light emitting element 12r, green light emitting element 12g, and blue light emitting element 12b is greater than the difference in chromaticity between these light emitting elements 12r, 12g, and 12b and the phosphor light emitting elements 12m and 12a, and therefore the light is not mixed by the diffuser plate 25 and is easily recognized as color unevenness.

[0045] In this embodiment, the red light emitting element 12r, the green light emitting element 12g, and the blue light emitting element 12b are arranged in positions that are not adjacent to each other. That is, the red light emitting element 12r, the green light emitting element 12g, and the blue light emitting element 12b are arranged in positions with the phosphor light emitting elements 12m and 12a, which have small chromaticity differences with the light emitting elements 12r, 12g, and 12b, respectively, interposed therebetween.

[0046] Therefore, the difference in chromaticity between adjacent light emitting elements 12 can be reduced, the color mixture at the diffusion plate 25 can be improved, and color unevenness can be reduced.

[0047] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0048] 10 Light Source Module 12 Light-emitting element 12a Second phosphor light-emitting element 12b Blue light-emitting element 12g green light emitting element 12m First phosphor light-emitting element 12r Red light emitting element 20 Lighting equipment 22 Lens 25 Diffuser 26 aperture 27 Aperture body

Claims

1. A light source module having a mounting area in which a plurality of types of light emitting elements are mounted, including red light emitting elements, green light emitting elements, and blue light emitting elements that do not contain a phosphor, and a first phosphor light emitting element that contains a phosphor, and a second phosphor light emitting element that emits light of a color different from that of the first phosphor light emitting element, In the mounting region, only the first phosphor light-emitting element or the second phosphor light-emitting element is disposed in a position where the number of adjacent light-emitting elements is four or less. A light source module characterized by:

2. The red light emitting element, the green light emitting element, and the blue light emitting element are arranged only at positions where the number of adjacent light emitting elements is five or more.

2. The light source module according to claim 1.

3. The blue light emitting element and the two or more cyan light emitting elements are not adjacent to each other.

3. The light source module according to claim 1 or 2.

4. A light source module according to any one of claims 1 to 3 is provided. A lighting device characterized by:

5. a lens that controls the light from the light source module; a diffusion plate that diffuses the light controlled by the lens; an aperture body having an aperture through which the light controlled by the lens passes; 5. The lighting device according to claim 4, further comprising:

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