lighting equipment
The modular lighting device design with separate heat dissipation paths for the light source and power supply units addresses the challenge of size and weight, achieving efficient heat dissipation through a base and heat dissipation piece formed by bending a metal plate, resulting in a compact and effective lighting solution.
Patent Information
- Application Number
- JP2021161278
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-09-30
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2041-09-30
AI Technical Summary
Conventional lighting devices with integrally molded heat dissipation fins face challenges in achieving a balance between small size, light weight, and effective heat dissipation due to the limitations of integral metal construction, which restricts fin thickness and number, leading to increased device size and weight.
The lighting device features a modular design with a heat dissipation piece fixed to a base, where the power supply unit is positioned with a gap between the base and a plate-like portion, allowing separate heat dissipation paths for the light source and power supply, and uses a base and heat dissipation piece formed by bending a metal plate for enhanced heat transfer.
This design achieves a small and lightweight structure with improved heat dissipation performance by separating heat dissipation paths, reducing direct heat transfer, and ensuring efficient heat dissipation without increasing the device's external size.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present disclosure relates to a heat dissipation structure for a lighting device. [Background technology]
[0002] Conventionally, lighting devices that are embedded in an installation surface such as a ceiling are known (see, for example, Patent Document 1). The lighting device disclosed in Patent Document 1 includes a device main body composed of a main body and a top plate, which are integrally molded aluminum parts. The device main body includes an annular side wall and heat dissipation fins from the bottom wall to the top, and a lower annular side wall from the bottom wall to the bottom. The lower annular side wall and the bottom wall define a light source housing section, in which a light source substrate is disposed in surface contact with the underside of the bottom wall. The annular side wall extends upward from the bottom wall and, together with the bottom wall, forms a substrate housing section with an open top. A power supply unit is housed in the substrate housing section, and the power supply unit is supported by an L-shaped bracket so as to be suspended from the top plate. Heat dissipation fins are provided on the outer surface of the annular side wall. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-16003 Summary of the Invention [Problem to be solved by the invention]
[0004] However, in the lighting device disclosed in Patent Document 1, the device body is integrally molded using a die-cast or forging process using a metal product such as aluminum, and the heat dissipation fins are also integrally formed. Therefore, it is difficult to make the heat dissipation fins thin, and attempting to ensure sufficient surface area to ensure heat dissipation performance results in an increase in the weight of the device body. Furthermore, to ensure a heat dissipation path from the light source board and the power supply unit, the power supply housing and the light source housing are integrally molded, and the heat dissipation fins are integrally formed on the annular side wall and bottom wall of the power supply housing. This makes it difficult to make the power supply housing and bottom wall thin, which limits the area in which the heat dissipation fins can be installed and the number of heat dissipation fins that can be installed. This results in an increase in the size of the device body in order to ensure heat dissipation performance.
[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a lighting device that achieves small size and light weight while ensuring heat dissipation performance. [Means for solving the problem]
[0006] The lighting device according to the present disclosure includes a light emitting element disposed No. 1 The light source device includes a light source unit having a substrate, a base having a first surface to which the light source unit is fixed, a heat dissipation piece provided on a second surface located on the back side of the first surface of the base, and a power supply unit that receives power from an external source and generates power to light the light emitting element, wherein the power supply unit is A second substrate and On the mounting surface Implemented Power supply circuit components and and a power supply box that covers the periphery of the power supply board and supports the power supply board, wherein the heat dissipation piece includes a fixing portion that is one end of the heat dissipation piece fixed to the second surface of the base, a plate-like portion that extends from the fixing portion in a direction intersecting with the second surface, and a power supply fixing portion to which the power supply unit is fixed, the mounting surface of the second substrate is disposed to face the surface of the plate-shaped portion, The power supply box is disposed with a gap between the second surface of the base, the fixing portion of the heat dissipation piece, and the plate-shaped portion. [Effects of the Invention]
[0007] According to the present disclosure, the lighting device has a structure in which a heat dissipation piece is fixed to a base, a power supply unit is fixed to the heat dissipation piece, and the power supply unit is positioned with a gap between the second surface of the base and the plate-shaped portion, thereby achieving a small and lightweight design while ensuring a heat dissipation area. [Brief explanation of the drawings]
[0008] [Figure 1] 1 is a perspective view of an illumination device 100 according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of the lighting device 100 shown in FIG. 1, viewed from above. [Figure 3] FIG. 3 is an exploded view of FIG. 2. [Figure 4] 1 is a perspective view of a lighting fixture 10 according to a first embodiment. [Figure 5] 1 is a perspective view of a lighting fixture 10 according to a first embodiment. [Figure 6] 1A and 1B are three-view diagrams of the lighting fixture 10. FIG. [Figure 7] 1 is an exploded perspective view of a lighting fixture 10 according to a first embodiment. [Figure 8] 1 is a cross-sectional view of an illumination device 100 according to a first embodiment. [Figure 9] 3 is an explanatory diagram of a structure for fixing a light source 13 to a base 11 according to the first embodiment. FIG. [Figure 10] FIG. 2 is an exploded perspective view of a power supply board support portion 52. [Figure 11] FIG. 10 is a perspective view of an illumination device 200 according to a second embodiment. [Figure 12] FIG. 12 is a perspective view of the lighting device 200 shown in FIG. 11 as viewed from above. [Figure 13] FIG. 13 is an exploded view of FIG. [Figure 14] FIG. 10 is a perspective view of a lighting fixture 210 according to a second embodiment. [Figure 15] FIG. 10 is a perspective view of a lighting fixture 210 according to a second embodiment. [Figure 16] 10A and 10B are three-view diagrams of a lighting device 200 according to a second embodiment. [Figure 17] FIG. 10 is a partial exploded perspective view of a lighting fixture 210 according to a second embodiment. [Figure 18] FIG. 10 is a cross-sectional view of an illumination device 200 according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION
[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and their description will be omitted or simplified as appropriate. Furthermore, the shape, size, arrangement, etc. of the configurations shown in each drawing may be changed as appropriate.
[0010] Embodiment 1 Fig. 1 is a perspective view of a lighting device 100 according to a first embodiment. Fig. 2 is a perspective view of the lighting device 100 shown in Fig. 1 as seen from above. Fig. 3 is an exploded view of Fig. 2. The lighting device 100 of the present disclosure is installed by being embedded in an installation surface such as a ceiling surface, with the mounting portion 30 and the light-transmitting cover 14 exposed on the installation surface. The lighting device 100 is also called a downlight fixture or a downlight.
[0011] 3, the lighting device 100 includes a lighting fixture 10 having a power supply unit 50 and a light source unit 12 (see FIG. 7), and a mounting unit 30 including a mounting bracket 32 for holding the lighting fixture 10 and mounting it on an installation surface. The lighting fixture 10 is fixed to the mounting unit 30 using a fixing member such as a screw. Specifically, the first surface 11a of the base 11 is fixed by abutting it against the upper surface of a support stand 35.
[0012] The mounting portion 30 is a design part with one surface exposed through an installation hole provided in the installation surface. The other surface of the mounting portion 30 faces the interior of the installation hole, and the lamp 10 and the mounting bracket 32 are installed on it. The mounting bracket 32 is, for example, a leaf spring protruding from the outside of the lighting device 100. It elastically deforms when inserted into the installation hole and then returns to its original shape to engage with the internal structure on the back side of the installation surface. A flange-shaped frame 31 is formed on the outer periphery of the mounting portion 30. The back surface of the frame 31, i.e., the surface 31a facing the interior of the installation hole, and the mounting bracket 32 sandwich the edge of the installation hole and the internal structure, thereby fixing the lighting device 100 to the installation surface. Note that in the first embodiment, the mounting brackets 32 protrude in three directions from the center of the lighting device 100, i.e., the center of the light source unit 12, toward the outer periphery. However, the number and locations of the mounting brackets 32 may be changed as long as the lighting device 100 can be attached to the installation surface.
[0013] As shown in Figure 1, one surface of the mounting part 30, which is the design part, has a reflective surface 33 around a hole 34 that exposes a translucent cover 14 that transmits light from the light source part 12, and a frame part 31 is formed on the outer periphery of the reflective surface 33.
[0014] 2 and 3, a support base 35 to which the lamp 10 is fixed protrudes from the rear side of the design portion of the mounting portion 30. Also, on the rear side of the design portion, a translucent cover holding surface 36 that faces the translucent cover 14 is formed around the hole 34.
[0015] 4 and 5 are perspective views of the lighting fixture 10 according to the first embodiment. FIG. 4 is a perspective view seen from the inside of the installation hole, and FIG. 5 is a perspective view seen from the design portion side. FIG. 6 is a three-view diagram of the lighting fixture 10. FIG. 6(a) is a top view, FIG. 6(b) is a front view, and FIG. 6(c) is a bottom view. FIG. 7 is an exploded perspective view of the lighting fixture 10 according to the first embodiment. FIG. 8 is a cross-sectional view of the lighting device 100 according to the first embodiment. FIG. 8 shows a cross section including the optical axis of the lighting device 100. As shown in FIGS. 7 and 8, the lighting fixture 10 has a light source unit 12 attached to a first surface 11a facing the design portion of the base 11, and a heat dissipation piece 20 attached to a second surface 11b on the back side of the first surface 11a.
[0016] The light source unit 12 is fixed by being sandwiched between the holder 15 and the base 11. The holder 15 is fixed to the base with screws 93.
[0017] The light source unit 12 has a light source 13 mounted on the surface of a light source substrate 12a. The light source 13 is a light-emitting element such as an LED element. A light-transmitting cover 14 is disposed to cover the light source 13, and is engaged with the holding unit 15 by inserting a locking piece 14a into a hole 15a formed in the holding unit 15.
[0018] FIG. 9 is an explanatory diagram of a structure for fixing the light source 13 to the base 11 according to the first embodiment. FIG. 9(a) is an enlarged view of the bottom surface of the lighting fixture 10. FIG. 9(b) is a cross-sectional view of the structure for fixing the light source 13 of the lighting fixture 10, showing a cross section of the AA portion. The holding portion 15 has a pressing portion 15b on the outside of the hole 15c that exposes the light source 13. The pressing portion 15b is a portion of the holding portion 15 that protrudes toward the base 11. The pressing portion 15b presses the light source substrate 12a against the base 11 by the elastic force of the material that makes up the holding portion 15. It is desirable that the holding portion 15 be made of an insulating material. The pressing portion 15b holds the light source substrate 12a with its back surface in contact with the base 11.
[0019] In the first embodiment, the pressing portion 15b is a leaf spring that extends from a portion of the edge of the opening 15d provided around the hole 15c and protrudes toward the light source substrate 12a. The pressing portion 15b is integrally molded with a portion of the holding portion 15. When the holding portion 15 is fixed to the base 11 with the screw 93, the pressing portion 15b bends upon contact with the light source substrate 12a and presses the light source substrate 12a toward the base 11 by its elasticity. This maintains the state in which the light source substrate 12a abuts against the first surface 11a of the base 11. Furthermore, the pressing portion 15b presses the light source substrate 12a by its elasticity, so that it can hold even light source substrates 12a of different thicknesses. Furthermore, even if the light source substrate 12a is warped and deformed, the pressing portion 15b presses the light source substrate 12a to correct it and bring it into close contact with the first surface 11a of the base 11. This ensures heat dissipation from the light source substrate 12a to the base 11 without needing to control the flatness of the light source substrate 12a more than necessary.
[0020] Furthermore, although base 11 is a flat plate and may have a slight warp, in the first embodiment, the warp can be corrected because base 11 is fastened to holder 15 using screws 93. Furthermore, as described above, lighting device 100 has a structure in which light source substrate 12a is pressed against first surface 11a of base 11, so that a heat dissipation path from light source substrate 12a to base 11 can be more reliably secured.
[0021] 7 and 8, a heat dissipation piece 20 is fixed to the second surface 11b of the base 11. The heat dissipation piece 20 is made by bending a thin metal plate into a U-shape, and includes a fixed portion 21 which is a flat portion along the second surface 11b of the base 11, and a plate-like portion 22 which extends from an end of the fixed portion 21 in a direction intersecting with the second surface 11b. In the first embodiment, the fixed portion 21 is a substantially rectangular portion, and the plate-like portions 22 extend from opposing sides of the substantially rectangular shape. Furthermore, the plate-like portions 22 extend perpendicular to the second surface 11b, but may also be inclined.
[0022] 7, the fixing portion 21 is fixed to the back side of the light source substrate 12a. The fixing portion 21 is fixed to the base 11 using a screw. With this configuration, heat from the light source substrate 12a is transferred to the heat dissipation piece 20 via the base 11.
[0023] The base 11 is a single flat metal plate, and is formed, for example, by punching a metal sheet into a predetermined shape. This configuration makes the base 11 easier to manufacture and increases the degree of freedom in shape. For example, the base 11 can be enlarged to increase the heat dissipation area from the light source unit 12. Heat from the light source unit 12 is also dissipated from the second surface 11b of the base 11.
[0024] A power supply fixing portion 23 is formed at the tip of the plate-shaped portion 22, i.e., at the end of the plate-shaped portion 22 opposite the fixing portion 21. The power supply unit 50 is fixed to the power supply fixing portion 23 with screws 90. As shown in FIG. 8 , the power supply unit 50 is disposed with a gap between the plate-shaped portion 22 of the heat dissipation piece 20 and the fixing portion 21 on the base 11 side. In other words, an air layer is interposed between the power supply unit 50 and the plate-shaped portion 22 and fixing portion 21 of the heat dissipation piece 20.
[0025] The power supply unit 50 is composed of a power supply board 51a and a power supply box 51 to which the power supply board 51a is fixed. The power supply box 51 includes a power supply board support part 52 that surrounds the power supply board 51a, and a terminal block plate 53 that is fixed to the upper surface of the power supply board support part 52 and to which a terminal block 59 is fixed.
[0026] 10 is an exploded perspective view of the power supply board support part 52. The power supply board support part 52 includes a structural member 52a to which a board 51b of the power supply board 51a is engaged and fixed, surrounding pieces 56 and 57 that surround the periphery of the power supply board 51a, and a heat transfer sheet 58 that is sandwiched and disposed between the board 51b and the bottom surface part 52b of the structural member 52a.
[0027] The structural member 52a of the power supply board support portion 52 is formed by bending a metal plate into a box shape with one side open. The bottom surface 52b of the box-shaped structural member 52a faces the secondary mounting surface of the board 51b. In the first embodiment, the board 51b has one side as a mounting surface and the other side as a secondary mounting surface. It may be a double-sided board with components mounted on both sides, or a single-sided board with components mounted only on the mounting surface and the secondary mounting surface as a non-mounting surface. When the board 51b is a double-sided board, electrical components are mounted on both sides of the board 51b, but the height of the components mounted on the secondary mounting surface is set shorter than the height of the components mounted on the mounting surface. The secondary mounting surface may also include a non-mounting surface where no components are mounted. Side walls 52c, 52g, 52h, and 52i extend from the edges of the bottom surface 52b and cover the four sides of the power supply board 51a. Although the structural member 52a has an open portion facing the bottom surface portion 52b, the portion is covered by the plate-shaped portion 22 of the heat dissipation piece 20, so the power supply board 51a is not exposed to the outside of the lighting device 100. Therefore, for example, when installing the lighting device 100, there is no risk of a worker accidentally touching the power supply board 51a, which is a live part, and the work can be performed safely. Furthermore, in the unlikely event that the board 51b shorts out and catches fire, it is possible to prevent flames from spreading toward the terminal block side. Note that the side walls 52c, 52g, 52h, and 52i may be partially omitted, and may be modified as appropriate as long as the base 11, the terminal block plate 53, the heat dissipation piece 20, and the structural member 52a are configured to cover the periphery of the power supply board 51a.
[0028] One side wall 52c of the structural member 52a is disposed parallel to the second surface 11b of the base 11 in the lighting fixture 10, and is the portion to which the terminal block plate 53 is fixed. A locking piece 52d that engages with the board 51b is formed on the side wall 52c, and holds the board 51b. The board 51b is pressed against the heat transfer sheet 58 and the bottom surface portion 52b by the locking piece 52d, and is held between the locking piece 52d and the heat transfer sheet 58. As a result, the structural member 52a and the power supply board 51a are combined together as a single unit, and a heat dissipation path from the power supply board 51a is also secured.
[0029] The enclosing piece 56 is an insulating sheet that is inserted between the power supply board 51a and the side walls 52c, 52g, 52h, and 52i of the structural member 52a. The enclosing piece 57 is an insulating sheet that covers the mounting surface of the board 51b. The enclosing piece 56 ensures an insulation distance between the power supply board 51a and the side walls 52c, 52g, 52h, and 52i of the structural member 52a. The enclosing piece 57 ensures an insulation distance between the power supply board 51a and the plate-shaped portion 22 of the heat dissipation piece 20, and the heat transfer sheet 58 ensures an insulation distance between the power supply board 51a and the bottom surface 52b of the structural member 52a.
[0030] As shown in FIGS. 6 and 7 , the terminal block plate 53 is fixed to the power supply board support portion 52. The terminal block plate 53 is disposed with one surface facing the second surface 11b of the base 11, and a terminal block 59 is fixed to a portion 53a that protrudes from the base 11 in a top view ( FIG. 6( a) ). The power supply board support portion 52 is fixed to a portion 53b of the terminal block plate 53 that faces the second surface 11b of the base 11. The terminal block plate 53 has a screw hole 53c and a locking piece 53d that protrudes downward in the portion 53b. The terminal block plate 53 is fixed to the power supply board support portion 52 by engaging and screwing using a screw hole 52e and a locking piece 52f provided in a tongue formed on a side wall 52c of the power supply board support portion 52. The terminal block plate 53 and the power supply board support portion 52 are electrically connected to each other by being fixed in this manner, and for example, both can be fixed to the same earth potential.
[0031] A fixing piece 54 formed on the terminal block plate 53 of the power supply unit 50 is fixed with a screw 90 to the power supply fixing portion 23 formed at the tip of the heat dissipation piece 20. At this time, only the fixing piece 54 of the power supply unit 50 abuts against the heat dissipation piece 20, and the power supply board support portion 52 is arranged with a gap between it and the plate-like portion 22 and the fixing portion 21 of the heat dissipation piece 20. Because the power supply unit 50 is arranged sandwiched between the plate-like portion 22 of the heat dissipation piece 20, space can be saved without increasing the external size of the lighting device 100, and heat dissipation performance can be ensured.
[0032] (Heat Dissipation of the Illumination Device 100) The power supply board 51a generates heat while the lighting device 100 is in use. The heat generated in the power supply board 51a is transferred from the board 51b to the structural member 52a via the heat transfer sheet 58 and the locking piece 52d of the structural member 52a. A portion of the heat transferred to the structural member 52a is transferred to the terminal block plate 53 and dissipated into the air. Note that a portion of the heat transferred to the terminal block plate 53 may be transferred from the power supply fixing part 23 to the heat dissipation piece 20, but the contact surface with the power supply fixing part 23 is small, so the transfer of heat from the power supply board 51a to the heat dissipation piece 20 is suppressed. Note that the heat from the power supply board 51a is also dissipated into the air in the process of being transferred to the structural member 52a and the terminal block plate 53.
[0033] Meanwhile, the light source 13 also generates heat during use of the lighting device 100. The heat generated by the light source 13 is transferred from the light source substrate 12a to the base 11, and then from the base 11 to the fixing portion 21 of the heat dissipation piece 20 and the plate-shaped portion 22. The entire lower surface of the fixing portion 21 of the heat dissipation piece 20 and the base 11 abuts against the second surface 11b of the base 11, facilitating heat transfer. The heat transferred to the plate-shaped portion 22 of the heat dissipation piece 20 is dissipated into the air. The heat of the heat dissipation piece 20 can be transferred from the power supply fixing portion 23 provided at the tip of the plate-shaped portion 22 to the terminal block plate 53, but the contact area is small. Therefore, the transfer of heat from the light source 13 to the power supply unit 50 is suppressed.
[0034] As described above, the lighting device 100 has a high heat dissipation efficiency because the heat dissipation path from the light source unit 12 and the heat dissipation path from the power supply board 51a are separated. Specifically, the power supply unit 50 is disposed with a gap between the fixed portion 21 and the plate-shaped portion 22 of the heat dissipation piece 20, thereby suppressing direct heat transfer from the power supply unit 50 to the fixed portion 21 or the plate-shaped portion 22. In addition, direct heat transfer from the light source unit 12 to the power supply unit 50 is also suppressed. As a result, the power supply unit 50 of the lighting device 100 is less susceptible to the thermal effects of the light source unit 12, and the operating quality and safety are maintained for a long period of time.
[0035] Furthermore, the lighting device 100 has a base 11 and heat dissipation piece 20 formed by bending a metal plate, which allows for a large surface area relative to the weight, which has the advantages of improved heat dissipation performance and ease of manufacture. Furthermore, the heat dissipation piece 20 and the power supply board support part 52 each have an independent structure, which has the advantage of making it easy to change the shape and dimensions of either one and to use it with other models.
[0036] (Variation) In the power supply unit 50 according to the first embodiment, the power supply substrate 51a is arranged so that its main mounting surface, on which the electrical components that make up the power supply circuit are mounted, and its rear side, the secondary mounting surface, face the surface of the plate-like portion 22 of the heat sink 20. However, the power supply substrate 51a may also be arranged so that its main mounting surface faces the surface of the terminal block plate 53 of the power supply unit 50, or so that its main mounting surface faces the base 11. Even in this case, the power supply unit 50 is fixed to the tip of the heat sink 20.
[0037] Embodiment 2 An illumination device 200 according to embodiment 2 will be described. The illumination device 200 according to embodiment 2 further includes a second heat dissipation piece 40 arranged in parallel with the heat dissipation piece 20 in addition to the illumination device 100 according to embodiment 1. In embodiment 2, the changes from embodiment 1 will be mainly described.
[0038] FIG. 11 is a perspective view of a lighting device 200 according to embodiment 2. FIG. 12 is a perspective view of the lighting device 200 shown in FIG. 11, seen from above. FIG. 13 is an exploded view of FIG. 12. FIGS. 14 and 15 are perspective views of a lighting fixture 210 according to embodiment 2. FIG. 16 is a three-view diagram of the lighting device 200 according to embodiment 2. FIG. 16(a) is a top view, FIG. 16(b) is a front view, and FIG. 16(c) is a bottom view. The lighting device 200 according to embodiment 2 is configured by combining a lighting fixture 210 with a mounting portion 30. The lighting fixture 210 is configured by adding a second heat dissipation piece 40 to the lighting fixture 10 according to embodiment 1. The second heat dissipation piece 40 is installed on the second surface 11b of the base 11 so that its surface is parallel to that of the heat dissipation piece 20.
[0039] Fig. 17 is a partially exploded perspective view of a lighting fixture 210 according to embodiment 2. Fig. 17 focuses on the base 11, the heat dissipation piece 20, and the second heat dissipation piece 40, and omits the light source unit 12 and the power supply unit 50. Fig. 18 is a cross-sectional view of the lighting device 200 according to embodiment 2. The second heat dissipation piece 40 has a plurality of heat dissipation pieces 41 and 42. The heat dissipation pieces 41 and 42 are formed by bending a metal plate formed into a predetermined shape.
[0040] The heat dissipation piece 41 includes a fixed portion 41a formed by bending a metal plate into a U-shape and fixed to the base 11 with screws 94, and plate-like portions 41b and 41c extending from the fixed portion 41a in a direction intersecting the second surface 11b of the base 11. The fixed portion 41a is made as large as possible to match the size of the second surface 11b of the base 11, and is configured to facilitate heat transfer from the base 11. As shown in FIG. 16(a), the plate-like portions 41b and 41c are set to be as large as possible without protruding from the outer shape of the base 11. The plate-like portion 41c is located outward of the plate-like portion 41b, and is set to have a smaller horizontal width than the plate-like portion 41b.
[0041] The heat dissipation piece 42 includes a fixed portion 42a formed by bending a metal plate into an L shape and fixed to the base 11 with a screw 94, and a plate-like portion 42b extending from the fixed portion 42a in a direction intersecting with the second surface 11b of the base 11. As shown in Fig. 16(a) , the heat dissipation piece 42 is set to be as large as possible without protruding from the outer shape of the base 11. Because the heat dissipation piece 42 is disposed outside the heat dissipation piece 41, the width direction dimension of the plate-like portion 42b is set to be smaller than the plate-like portions 41b and 41c of the heat dissipation piece 41.
[0042] 11 to 17, and may be, for example, all metal plates bent into an L shape or all bent into a U shape. Furthermore, the heat dissipation pieces 41 and 42 constituting the second heat dissipation piece 40 may be made up of even more heat dissipation pieces.
[0043] A tongue-shaped piece 43 is formed at the tip of the heat dissipation piece 42, bent toward the heat dissipation piece 41. The tip of the tongue-shaped piece 43 faces the flat surface of the heat dissipation piece 41. Therefore, for example, even if a worker grasps the heat dissipation piece 42 from the outside during installation of the lighting device 100, the tip of the tongue-shaped piece 43 abuts against the flat surface of the heat dissipation piece 41, preventing the heat dissipation piece 42 from tilting toward the heat dissipation piece 41, and maintaining the distance between the heat dissipation pieces 41 and 42. This prevents the heat dissipation performance of the second heat dissipation piece 40 from being impaired. Alternatively, the tongue-shaped piece 43 may be formed on the heat dissipation piece 41, thereby maintaining the distance between the heat dissipation pieces 41 and 42, between the plate-shaped portions 41b and 41c, and between the heat dissipation piece 41 and the plate-shaped portion 22. Alternatively, the tongue-shaped piece 43 may be formed by cutting out a portion of the heat dissipation piece 40. That is, the tongue-shaped piece 43 is not limited to the tip of the heat dissipation piece 40, but may be formed by cutting out a part of the heat dissipation piece 40 in the center of the plate surface.
[0044] Although not shown, the terminal block plate 53 may be formed so as to cover the tip of the second heat dissipation piece 40, and the heat dissipation piece 40 may be supported so as not to tilt by an upright piece formed by bending the peripheral edge of the terminal block plate 53 toward the base 11 or by cutting and raising a part of the terminal block plate 53 toward the gap in the heat dissipation piece 40. In this case, it is desirable that the terminal block plate 53 be provided with, for example, a slit-shaped opening so as not to hinder heat dissipation.
[0045] The heat dissipation pieces 41 and 42 can also be replaced with heat dissipation pieces made of die-cast aluminum. In this case, the fixing portions 41a and 42a become thicker, and the plate-like portions 41b, 41c, and 42b also become thicker, which makes the lighting device 200 heavier. However, the heat capacity of the heat dissipation pieces 41 and 42 increases, and the surface area can be increased by providing irregularities on the surface, thereby improving the heat dissipation performance.
[0046] The heat dissipation pieces 41 and 42 are fixed directly to the base 11 and are not connected to other components that make up the lighting device 200, and are therefore used only to dissipate heat from the light source unit 12. Therefore, heat from the light source unit 12 can be efficiently dissipated without being affected by other heat-generating units such as the power supply unit 50.
[0047] In the lighting device 200 according to embodiment 2, the provision of the second heat dissipation pieces 40 can improve the heat dissipation performance compared to embodiment 1. The shape, arrangement, and number of the second heat dissipation pieces 40 can be changed as appropriate depending on the amount of heat dissipation required.
[0048] As described above, the first and second embodiments of the present disclosure have been described. However, the first and second embodiments are merely examples of the lighting devices 100 and 200, and they can be combined with other known technologies. Furthermore, the respective embodiments can be combined. In other words, the lighting devices 100 and 200 can have some of their configurations omitted or modified without departing from the scope of the present disclosure. [Explanation of symbols]
[0049] 10 lighting fixture, 11 base, 11a first surface, 11b second surface, 12 light source unit, 12a light source board, 13 light source, 14 translucent cover, 14a locking piece, 15 holding portion, 15a hole, 15b pressing portion, 15c hole, 15d opening, 20 heat dissipation piece, 21 fixing portion, 22 plate-shaped portion, 23 power supply fixing portion, 30 mounting portion, 31 frame portion, 31a surface, 32 mounting bracket, 33 reflective surface, 34 hole, 35 support base, 36 translucent cover holding surface, 40 second heat dissipation piece, 41 heat dissipation piece, 41a fixing portion, 41b plate-shaped portion, 41c plate-shaped portion, 42 heat dissipation piece, 42a fixing portion, 42b plate-shaped portion, 50 power supply unit, 51 power supply box, 51a Power supply board, 51b board, 52 power supply board support portion, 52a structural member, 52b bottom portion, 52c side wall, 52d locking piece, 52e screw hole, 52f locking portion, 52g side wall, 52h side wall, 53 terminal block plate, 53a portion, 53b portion, 53c screw hole, 53d locking piece, 54 fixing piece, 56 enclosing piece, 57 enclosing piece, 58 heat transfer sheet, 59 terminal block, 90 screw, 91 screw, 93 screw, 94 screw, 100 lighting device, 200 lighting device, 210 lighting fixture.
Claims
1. a light source unit having a first substrate on which light emitting elements are arranged; a base having a first surface to which the light source unit is fixed; a heat dissipation piece provided upright on a second surface of the base located on the rear side of the first surface; a power supply unit that receives power from an external source and generates power to light the light-emitting element, The power supply unit a power supply substrate having a second substrate and power supply circuit components mounted on a mounting surface of the second substrate; a power supply box that covers the periphery of the power supply board and supports the power supply board, The heat sink piece is a fixing portion which is one end of the heat dissipation piece fixed to the second surface of the base; a plate-like portion extending from the fixed portion in a direction intersecting the second surface; a power supply fixing portion to which the power supply portion is fixed, the mounting surface of the second substrate is disposed to face the surface of the plate-shaped portion, The power supply box includes: The lighting device is arranged with a gap between the second surface of the base, the fixed portion of the heat dissipation piece, and the plate-shaped portion.
2. The power supply fixing unit is The lighting device according to claim 1 , wherein the heat sink is provided at a tip of the plate-shaped portion, which is the other end of the heat sink.
3. The power supply unit It is equipped with a terminal block that relays power supplied from an external source. The power supply box includes:
3. The lighting device according to claim 1, wherein the lighting device is formed by connecting at least two members: a terminal block plate to which the terminal block is fixed; and a power supply board support portion to which the power supply board is fixed.
4. The power supply substrate support portion is It is fixed only to the terminal block plate, The terminal block plate is The lighting device according to claim 3 , wherein the lighting device is fixed to the power supply fixing portion provided on the heat dissipation piece.
5. The terminal block plate is The lighting device according to claim 4 , wherein the light source is a plate-like member, and one surface of the plate-like member is disposed so as to face the second surface of the base.
6. The power supply substrate support portion is a structural member formed in a box shape with one side being an opening, The structural member is a bottom surface portion facing the opening; a side wall extending from an edge of the bottom surface, The second board of the power supply board is 6. The lighting device according to claim 4, wherein the structural member is fixed between the bottom surface and engaging pieces provided on opposing side walls of the structural member.
7. The power supply substrate support portion is a heat transfer sheet disposed in contact with the power supply board; The bottom surface of the structural member is the second substrate faces a secondary mounting surface, which is the surface opposite to the mounting surface of the second substrate; The heat transfer sheet is The lighting device according to claim 6 , wherein the lighting device is disposed between the secondary mounting surface and the bottom surface portion of the power supply board.
8. The sidewall surface of the structural member is the heat dissipation piece is disposed in a direction intersecting the surface of the plate-shaped portion, The plate-shaped portion of the heat dissipation piece is The lighting device according to claim 6 , wherein the light source is disposed so as to cover the opening of the power supply board support portion.
9. The terminal block plate is The lighting device according to claim 4, further comprising a surface to which the terminal block is fixed, the surface being arranged to face the second surface of the base.
10. The power supply board includes:
10. The lighting device according to claim 1, wherein the mounting surface of the second substrate is oriented in a direction intersecting with the second surface of the base.
11. The heat sink piece is It is formed by bending sheet metal, The fixing portion is a flat portion having a surface disposed along the second surface of the base, The plate-shaped portion is The lighting device according to claim 1 , wherein the fixing portion is a flat portion extending from an edge of the fixing portion in a direction intersecting with the second surface.
12. The plate-shaped portion is a plurality of plate-shaped portions; The power supply unit The lighting device according to claim 11 , wherein the lighting device is sandwiched between the plurality of plate-shaped portions.
13. a second heat dissipation piece extending from the second surface of the base; The second heat dissipation piece is a fixing portion that is a surface along the second surface; The lighting device according to claim 11 or 12, further comprising: a plate-shaped portion extending from an edge of the fixing portion in a direction intersecting with the second surface.
14. The lighting device according to claim 13 , wherein the plate-shaped portion of the second heat dissipation piece and the plate-shaped portion of the first heat dissipation piece are arranged in parallel.
Citation Information
Patent Citations
Illuminating device
JP2009064781A
Illumination device
JP2010016003A
Electric apparatus
JP2010272497A
Lighting system
JP2010287401A
Lighting device
JP2019012626A