JP7728136B2 - lighting equipment - Google Patents

Description

This disclosure relates to a heat dissipation structure for a lighting device.

Conventionally, lighting devices that are embedded in installation surfaces such as ceilings have been known (see, for example, Patent Document 1). The lighting device disclosed in Patent Document 1 has a device main body composed of a main body and a top plate, which are integrally molded aluminum parts. The device main body has 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 that it is suspended from the top plate. Furthermore, heat dissipation fins are provided on the outer surface of the annular side wall.

JP 2010-16003 A

However, the lighting device disclosed in Patent Document 1 has a device body that is integrally molded using die-casting or forging methods from a metal product such as aluminum, and the heat dissipation fins are also formed integrally. This makes it 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 power supply, the power supply housing and light source housing are molded integrally, and heat dissipation fins are formed integrally on the annular side wall that constitutes the power supply housing and the bottom wall that constitutes the light source housing. This makes it difficult to make the power supply housing and bottom wall thin, which limits the area in which heat dissipation fins can be installed and places restrictions on the number of heat dissipation fins that can be installed, resulting in an increase in the size of the device body in order to ensure heat dissipation performance.

This disclosure has been made to solve the above-mentioned problems, and aims to provide a lighting device that is small and lightweight while maintaining heat dissipation performance.

The lighting device according to the present disclosure comprises a light source unit having a first substrate on which light-emitting elements are arranged, a base on whose first surface the light source unit is fixed, a heat dissipation piece erected 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 elements, wherein the power supply unit comprises a power supply board having a second substrate and power circuit components mounted on a mounting surface of the second substrate, 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 comprises 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 fixing portion in a direction intersecting the second surface, and a power supply fixing portion to which the power supply unit is fixed , wherein the mounting surface of the second substrate is positioned opposite the surface of the plate-like portion, and the power supply box is positioned with a gap between the second surface of the base, the fixing portion of the heat dissipation piece, and the plate-like portion.

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 compact and lightweight design while ensuring a sufficient heat dissipation area.

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 viewed from above. FIG. 3 is an exploded view of FIG. 2. 1 is a perspective view of a lamp 10 according to a first embodiment. 1 is a perspective view of a lamp 10 according to a first embodiment. 1 is a three-view diagram of the lighting fixture 10. FIG. 1 is an exploded perspective view of a lamp 10 according to a first embodiment. FIG. 1 is a cross-sectional view of a lighting device 100 according to a first embodiment. 3 is an explanatory diagram of a structure for fixing a light source 13 to a base 11 according to the first embodiment. FIG. FIG. 2 is an exploded perspective view of a power supply board support portion 52. FIG. 10 is a perspective view of a lighting device 200 according to a second embodiment. FIG. 12 is a perspective view of the lighting device 200 shown in FIG. 11 as viewed from above. FIG. 13 is an exploded view of FIG. 12. FIG. 10 is a perspective view of a lighting fixture 210 according to a second embodiment. FIG. 10 is a perspective view of a lighting fixture 210 according to a second embodiment. 10A and 10B are three-view diagrams of a lighting device 200 according to a second embodiment. FIG. 10 is a partial exploded perspective view of a lighting fixture 210 according to a second embodiment. FIG. 10 is a cross-sectional view of a lighting device 200 according to a second embodiment.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that identical or corresponding parts in each drawing will be denoted by the same reference numerals, and their description will be omitted or simplified as appropriate. Furthermore, the shape, size, and arrangement of the configurations shown in each drawing may be modified as appropriate.

Embodiment 1.
Fig. 1 is a perspective view of a lighting device 100 according to embodiment 1. 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.

As shown in FIG. 3, the lighting device 100 comprises a lighting fixture 10 having a power supply unit 50 and a light source unit 12 (see FIG. 7), and a mounting unit 30 equipped with a mounting bracket 32 for holding the lighting fixture 10 and attaching it to 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 the support base 35.

The mounting portion 30 is a design part with one surface exposed from 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 lighting fixture 10 and 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 edge of the installation hole and the internal structure are sandwiched between the back surface of the frame 31, i.e., the surface 31a facing the interior of the installation hole, and the mounting bracket 32, thereby fixing the lighting device 100 to the installation surface. Note that in embodiment 1, 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 may be changed as long as the lighting device 100 can be attached to the installation surface.

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 the translucent cover 14, which transmits light from the light source part 12, and a frame part 31 is formed on the outer periphery of the reflective surface 33.

As shown in Figures 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 part 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.

Figures 4 and 5 are perspective views of the lighting fixture 10 according to embodiment 1. Figure 4 is a perspective view seen from the inside of the installation hole, and Figure 5 is a perspective view seen from the design portion side. Figure 6 is a three-view diagram of the lighting fixture 10. Figure 6(a) is a top view, Figure 6(b) is a front view, and Figure 6(c) is a bottom view. Figure 7 is an exploded perspective view of the lighting fixture 10 according to embodiment 1. Figure 8 is a cross-sectional view of the lighting device 100 according to embodiment 1. Figure 8 shows a cross-section including the optical axis of the lighting device 100. As shown in Figures 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 sink 20 attached to a second surface 11b on the back side of the first surface 11a.

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.

The light source unit 12 has a light source 13 mounted on the surface of the light source substrate 12a. The light source 13 is a light-emitting element such as an LED element. The translucent cover 14, which is arranged to cover the light source 13, engages with the holding unit 15 by inserting a locking piece 14a into a hole 15a formed in the holding unit 15.

Figure 9 is an explanatory diagram of the structure for fixing the light source 13 to the base 11 according to embodiment 1. Figure 9(a) is an enlarged view of the bottom surface of the lighting fixture 10. Figure 9(b) is a cross-sectional view of the structure for fixing the light source 13 of the lighting fixture 10, showing the cross section of the A-A section. 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 preferable 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.

In embodiment 1, pressing portion 15b is a leaf spring that extends from a portion of the edge of opening 15d provided around hole 15c and protrudes toward light source substrate 12a. Pressing portion 15b is integrally molded with a portion of holding portion 15. When holding portion 15 is fixed to base 11 with screw 93, pressing portion 15b bends upon contact with light source substrate 12a, and uses its elasticity to press light source substrate 12a toward base 11. This maintains light source substrate 12a in contact with first surface 11a of base 11. Furthermore, pressing portion 15b uses its elasticity to hold light source substrate 12a down, allowing it to hold light source substrates 12a of different thicknesses. Even if light source substrate 12a is warped and deformed, pressing portion 15b can correct light source substrate 12a and ensure close contact with first surface 11a of base 11. This ensures heat dissipation from the light source substrate 12a to the base 11 without overly controlling the flatness of the light source substrate 12a.

Furthermore, the base 11 is a flat plate and may have some warping, but in embodiment 1, it is fastened to the holding portion 15 using screws 93, so the warping can be corrected. Furthermore, as described above, the lighting device 100 has a structure in which the light source substrate 12a is pressed against the first surface 11a of the base 11, so a heat dissipation path from the light source substrate 12a to the base 11 can be more reliably secured.

As shown in Figures 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 that extends along the second surface 11b of the base 11, and a plate-like portion 22 that extends from the end of the fixed portion 21 in a direction that intersects with the second surface 11b. In embodiment 1, the fixed portion 21 is a roughly rectangular portion, and the plate-like portions 22 extend from opposing sides of the roughly rectangular shape. Furthermore, the plate-like portions 22 extend perpendicular to the second surface 11b, but may also be inclined.

As shown in Figure 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 screws. With this configuration, heat from the light source substrate 12a is transferred to the heat dissipation piece 20 via the base 11.

The base 11 is a flat metal plate, 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 its 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.

A power supply fixing portion 23 is formed at the tip of the plate-shaped portion 22, i.e., the end of the plate-shaped portion 22 opposite the fixed portion 21. The power supply unit 50 is fixed to the power supply fixing portion 23 with screws 90. As shown in Figure 8, the power supply unit 50 is positioned with a gap between the plate-shaped portion 22 of the heat dissipation piece 20 and the fixed 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 fixed portion 21 of the heat dissipation piece 20.

The power supply unit 50 consists of a power supply board 51a and a power supply box 51 to which it 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 top surface of the power supply board support part 52 and to which a terminal block 59 is fixed.

Figure 10 is an exploded perspective view of the power supply board support portion 52. The power supply board support portion 52 includes a structural member 52a to which the 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 portion 52b of the structural member 52a.

The structural member 52a of the power supply board support portion 52 is formed by bending sheet metal 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 embodiment 1, the board 51b has one side as the mounting surface and the other side as the 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 the non-mounting surface. If 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 lower 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 all four sides of the power supply board 51a. The structural member 52a has an open portion facing the bottom surface 52b, but is covered by the plate-shaped portion 22 of the heat sink 20, preventing the power supply board 51a from being exposed to the outside of the lighting device 100. This prevents workers from accidentally touching the power supply board 51a, which is a live part, during installation of the lighting device 100, allowing for safe work. Furthermore, in the unlikely event that the board 51b shorts out and catches fire, this prevents flames from spreading toward the terminal block. Note that some of the side walls 52c, 52g, 52h, and 52i may be omitted, and modifications may be made as appropriate as long as the base 11, terminal block plate 53, heat sink 20, and structural member 52a are configured to cover the periphery of the power supply board 51a.

One side wall 52c of the structural member 52a is arranged 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, holding the board 51b in place. The board 51b is pressed against the heat transfer sheet 58 and bottom surface 52b by the locking piece 52d, and is held between the locking piece 52d and the heat transfer sheet 58. This combines the structural member 52a and power supply board 51a together, ensuring a heat dissipation path from the power supply board 51a.

Enclosure piece 56 is an insulating sheet that is inserted between power supply board 51a and side walls 52c, 52g, 52h, and 52i of structural member 52a. Enclosure piece 57 is an insulating sheet that covers the mounting surface of board 51b. Enclosure piece 56 ensures an insulating distance between power supply board 51a and side walls 52c, 52g, 52h, and 52i of structural member 52a. Enclosure piece 57 ensures an insulating distance between power supply board 51a and plate-shaped portion 22 of heat dissipation piece 20, and heat transfer sheet 58 ensures an insulating distance between power supply board 51a and bottom surface 52b of structural member 52a.

As shown in Figures 6 and 7, the terminal block plate 53 is fixed to the power supply board support portion 52. The terminal block plate 53 is positioned with one side facing the second surface 11b of the base 11, and a terminal block 59 is fixed to a portion 53a that extends beyond the base 11 when viewed from above (Figure 6(a)). The power supply board support portion 52 is fixed to the 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 downward-protruding locking piece 53d in portion 53b, and is fixed to each other by engaging and screwing using the screw hole 52e and locking piece 52f provided on a tongue formed on the 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 by being fixed in this manner, and can, for example, be fixed to the same ground potential.

The 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 the heat dissipation piece 20, and the power supply board support portion 52 is positioned with a gap between it and the plate-shaped portion 22 and fixing portion 21 of the heat dissipation piece 20. Because the power supply unit 50 is positioned between the plate-shaped portions 22 of the heat dissipation piece 20, space can be saved without increasing the external dimensions of the lighting device 100, and heat dissipation performance can be ensured.

(Heat Dissipation of the Lighting Device 100)
The power supply board 51a generates heat during use of the lighting device 100. 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 during the process of transfer to the structural member 52a and the terminal block plate 53.

Meanwhile, when the lighting device 100 is in use, the light source 13 also generates heat. The heat generated by the light source 13 is transferred from the light source substrate 12a to the base 11, and from the base 11 to the fixed portion 21 of the heat dissipation piece 20 and then to the plate-shaped portion 22. The entire underside of the fixed 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. Heat from the heat dissipation piece 20 can be transferred from the power supply fixed 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, transfer of heat from the light source 13 to the power supply unit 50 is suppressed.

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 positioned with a gap between the fixed portion 21 and the plate-shaped portion 22 of the heat dissipation piece 20, which reduces direct heat transfer from the power supply unit 50 to the fixed portion 21 or the plate-shaped portion 22. Direct heat transfer from the light source unit 12 to the power supply unit 50 is also reduced. 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, maintaining operational quality and safety over the long term.

In addition, the lighting device 100 has a base 11 and heat dissipation piece 20 that are formed by bending and shaping plate-shaped metal, allowing for a large surface area relative to the weight, which has the advantages of improved heat dissipation performance and ease of manufacturing. Furthermore, because the heat dissipation piece 20 and power supply board support part 52 each have an independent structure, it is easy to change the shape and dimensions of either one, making it easy to share with other models.

(Modification)
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.

Embodiment 2.
A lighting device 200 according to embodiment 2 will be described. The lighting 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 lighting device 100 according to embodiment 1. The description of embodiment 2 will focus on changes from embodiment 1.

Figure 11 is a perspective view of a lighting device 200 according to embodiment 2. Figure 12 is a perspective view of the lighting device 200 shown in Figure 11, viewed from above. Figure 13 is an exploded view of Figure 12. Figures 14 and 15 are perspective views of a lighting fixture 210 according to embodiment 2. Figure 16 is a three-view diagram of the lighting device 200 according to embodiment 2. Figure 16(a) is a top view, Figure 16(b) is a front view, and Figure 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.

Figure 17 is a partially exploded perspective view of a lighting fixture 210 according to embodiment 2. Figure 17 focuses on the base 11, heat dissipation piece 20, and second heat dissipation piece 40, with the light source unit 12 and power supply unit 50 omitted. Figure 18 is a cross-sectional view of a lighting device 200 according to embodiment 2. The second heat dissipation piece 40 has multiple 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.

The heat dissipation piece 41 is made by bending a metal plate into a U-shape. It comprises a fixed portion 41a that is fixed to the base 11 with screws 94, and plate-like portions 41b and 41c that extend 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. Furthermore, as shown in FIG. 16(a), the dimensions of the plate-like portions 41b and 41c are set as large as possible without protruding from the outer shape of the base 11. The plate-like portion 41c is located further outward than the plate-like portion 41b, and its horizontal width is set smaller than that of the plate-like portion 41b.

The heat dissipation piece 42 is made by bending sheet metal into an L-shape and includes a fixed portion 42a that is fixed to the base 11 with screws 94, and a plate-like portion 42b that extends from the fixed portion 42a in a direction intersecting the second surface 11b of the base 11. As shown in Figure 16(a), the heat dissipation piece 42 is sized as large as possible without protruding from the outer shape of the base 11. Because the heat dissipation piece 42 is positioned further outboard than the heat dissipation piece 41, the width direction dimension of the plate-like portion 42b is set smaller than the plate-like portions 41b and 41c of the heat dissipation piece 41.

The shapes of the heat dissipation pieces 41 and 42 are not limited to those shown in Figures 11 to 17; for example, they may all be made of metal sheet bent into an L-shape, or all bent into a U-shape. Furthermore, the heat dissipation pieces 41 and 42 that make up the second heat dissipation piece 40 may be made up of even more heat dissipation pieces.

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 ensures that the heat dissipation performance of the second heat dissipation piece 40 is not impaired. The tongue-shaped piece 43 may also be formed on the heat dissipation piece 41, thereby maintaining the distance between the heat dissipation pieces 41 and 42, the plate-shaped portions 41b and 41c, and the heat dissipation piece 41 and the plate-shaped portion 22. The tongue-shaped piece 43 may also be formed by cutting out a portion of the heat dissipation piece 40. In other words, the tongue-shaped piece 43 is not limited to being at the tip of the heat dissipation piece 40, but may be formed by cutting out a portion of the heat dissipation piece 40 in the center of the plate surface.

Although not shown, the terminal block plate 53 may be formed 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 part of the terminal block plate 53 toward the gap in the heat dissipation piece 40. In this case, it is desirable to provide the terminal block plate 53 with, for example, slit-shaped openings so as not to hinder heat dissipation.

The heat dissipation pieces 41 and 42 can also be replaced with heat dissipation pieces made from die-cast aluminum. In this case, the fixing portions 41a and 42a become thicker, and the plate-shaped portions 41b, 41c, and 42b also become thicker, making 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 heat dissipation performance.

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. This allows for efficient heat dissipation from the light source unit 12 without being affected by other heat-generating components such as the power supply unit 50.

In the lighting device 200 according to embodiment 2, the installation of second heat dissipation pieces 40 allows for improved heat dissipation performance compared to embodiment 1. The shape, arrangement, and quantity of the second heat dissipation pieces 40 can be changed as appropriate depending on the amount of heat dissipation required.

As described above, embodiments 1 and 2 of the present disclosure have been described. However, embodiments 1 and 2 are merely examples of the lighting devices 100 and 200, and they can be combined with other known technologies. Furthermore, the respective embodiments can also be combined. In other words, the lighting devices 100 and 200 can have some of their configurations omitted or modified without departing from the spirit and scope of the present disclosure.

10 Lighting fixture, 11 Base, 11a First surface, 11b Second surface, 12 Light source unit, 12a Light source board, 13 Light source, 14 Light-transmitting 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 Reflecting surface, 34 Hole, 35 Support base, 36 Light-transmitting 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 surrounding piece, 57 surrounding 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 (14)

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. 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. 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. 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. 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. 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. 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 sandwiched between the secondary mounting surface and the bottom surface of the power supply board. 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 or 7 , which is disposed so as to cover the opening of the power supply board support part. 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 so as to face the second surface of the base. The power supply board includes:
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. 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. 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. 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. 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.