JP2014022314A - Heat sink device and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink device light-weighted, excellent in heat radiation, and readily fabricable for improved assemblability by using a sheet metal member for radiating heat generated by a light source.SOLUTION: A heat sink ASSY 13 comprises: a slitted base plate 5 of a board-like shape in which slits 5-1, etc. are formed; plate fins 1 to 4 (two pairs of plate fins 1 to 4) each of which has its lower part bent to form a bent part, and the remaining parts of which form fin parts which pass through the corresponding slits of the slitted base plate 5 and extend upward; a base plate 6 which covers the bottom face of the bent part of each plate fin and holds the bent part of each plate fin between it and the slitted base plate 5; and a holding machine (male screws 21a, 22a, 23a and female screws 21b, 22b, 23b) for securing the bent parts between the slitted base plate 5 and the base plate 6.

Description

  The present invention relates to a heat sink device having a radiation fin and an illumination device using the heat sink device.

  Many LED lighting fixtures employ aluminum die-casting for heat dissipation and member mounting. However, as the input power increases, the amount of heat increases and the size of the aluminum die cast increases, so the material cost increases due to the increase in the size of the aluminum die cast, and the safety (drop) due to the increased weight of the equipment. Etc. are concerned.

  A heat sink by aluminum die-casting can be formed into an arbitrary shape and is excellent in workability. On the other hand, when the heat capacity is increased, the shape and weight are increased, and there are many restrictions due to the heat sink shape itself. As a constrained part, in the case of a lighting device for embedding a ceiling, since the diameter of the mounting hole in the ceiling is determined, the heat sink shape cannot be made larger than a certain hole diameter. When it is desired to increase the heat sink fin surface area for heat dissipation, the fin length is increased to increase the surface area. In that case, when the draft angle of the fin portion is taken into consideration when manufacturing the heat sink by aluminum die casting, the fin tip is thin and the root is thick. As a result, the weight increases more than necessary, which affects the safety (drop) during installation, the manufacturing period, and the part cost.

  As a countermeasure for these, there is a technique in which a plurality of heat sinks are stacked and a wiring board (LED module) is attached so as to face the stacked layers (Patent Document 1). In addition, there is a heat dissipation module in which a plurality of heat dissipation plates are arranged in a circle so as to be in contact with each other at a predetermined interval and support the upper and lower sides (Patent Document 2).

JP 2007-150268 A Utility Model Registration No. 3155521

  However, conventional heat sinks (for example, Patent Documents 1 and 2) are a method in which a plurality of heat sinks are stacked or combined, and the assemblability is poor.

  An object of the present invention is to provide a heat sink device that is lightweight, excellent in heat dissipation, and easy to assemble and has good assemblability by using a sheet metal member as a member that dissipates heat generated from a light source. .

The heat sink device of this invention is
A first base plate that is plate-shaped and has slits that penetrate from the lower surface to the upper surface;
A plate-shaped plate heat dissipating fin, wherein a part of the periphery is bent to form a bent portion, and the fin portion, which is the remaining portion of the bent portion, connects the slit of the first base plate to the first plate. The first base plate penetrates from the lower surface toward the upper surface and protrudes from the slit, and the upper surface of the bent portion on which the fin portion protrudes faces the lower surface of the first base plate. And plate radiating fins,
It is plate-shaped and has a larger area than the lower surface, which is the other surface of the bent portion of the plate heat dissipating fin, and the upper surface, which is one surface, covers the lower surface of the bent portion, A second base plate sandwiching the bent portion of the plate heat radiation fin together with the first base plate;
The first base plate and the second base plate are provided with a clamping mechanism that clamps the bent portion.

  ADVANTAGE OF THE INVENTION According to this invention, by setting it as the structure which used sheet metal (plate-shaped body) for the heat radiating member, the heat sink which is lightweight and excellent in heat dissipation, and can be produced simply can be provided.

FIG. 2 is an exploded perspective view (a) of the lighting device 100 according to the first embodiment and a perspective view (b) of the lighting device 100. FIG. 3 is a perspective view showing a heat sink ASSY 13 according to the first embodiment. The perspective view of the base plate 5 with a slit of the heat sink ASSY13 of Embodiment 1, and the base plate 6. FIG. Sectional drawing which showed the contact surface of heat sink ASSY13 of Embodiment 1, and the light source module 8. FIG. The top view (a) and BB sectional drawing (b) of the heat sink ASSY13 of Embodiment 1. FIG.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view (FIG. 1A) of the lighting device 100 showing the first embodiment and a perspective view after the lighting device 100 is assembled (FIG. 1B). FIG. 2 is a perspective view showing an assembled state of eight plate fins when each plate fin is assembled to the heat sink ASSY 13. As shown in FIG. 2 (or FIG. 4), a total of eight plate fins are assembled to the heat sink ASSY 13 by two plate fins. FIG. 3 is a perspective view of the base plate 5 with slit and the base plate 6 of the heat sink ASSY 13. 4 is a cross-sectional view corresponding to the AA cross section of FIG. 1 showing the contact surface between the heat sink ASSY 13 and the light source module 8. FIG. 5 is a top view (a) and a BB cross-sectional view (b) of the heat sink ASSY 13.

(Configuration of lighting device 100)
As shown in FIG. 1, the illumination device 100 includes a base plate 5 with slits, two plate fins 1 to 4, a base plate 6, a sheet 7 (sheet material) having flexibility and heat conductivity, and a plurality of sheets. A light source module 8 (mounting substrate) on which an LED 12 (light source) is mounted, a substrate retainer 9, a translucent cover 10 attached to the substrate retainer 9 to cover and protect the light source module 8, and light distribution are determined. And a frame 11 having a function.

(Heatsink ASSY13)
The heat sink ASSY 13 (heat sink device) includes a base plate 5 with slits (first base plate), two plate fins 1 to 4 (a plurality of heat radiating fins), a base plate 6 (second base plate), and a clamping mechanism (Male screws 21a, 22a, 23a and female screw portions 21b, 22b, 23b). The base plate 5 with slits which is a plate-like body, the base plate 6 which is a plate-like body, and the eight plate fins which are plate-like bodies are all sheet metal parts. In addition to the sheet metal part, any sheet-like body having thermal conductivity equivalent to that of the sheet metal part may be used, and the present invention is not limited to the sheet metal part.

(Assembly of lighting device 100)
The illumination device 100 shown in FIG. 1 inserts eight plate fins into each slit of the slit-containing base plate 5 and sandwiches the inserted eight plate fins between the slit-containing base plate 5 and the base plate 6. Then, the sheet 7, the light source module 8, and the substrate holder 9 are disposed on the lower side of the base plate 6, and the cover 10 is attached to the lower side of the substrate holder 9 with four screws. Then, the base plate 9 to which the base plate 5 with slits, the eight plate fins, the base plate 6, the sheet 7, the light source module 8, and the cover 10 are attached is attached to the frame 11 with the male screws 21a, 22a, and 23a. The frame 11 has female screw portions 21b, 22b, and 23b that are screwed into the male screws 21a, 22a, and 23a, respectively. As described above, the lighting device 100 of FIG. 1B is assembled.

(Base plate with slit 5)
As shown in FIGS. 3A and 4, the slit-containing base plate 5 has a plate shape, and a plurality of slits penetrating from the lower surface 5 a to the upper surface 5 b are formed. The slit-containing base plate 5 is formed with a plurality of slits corresponding to each plate fin of the two plate fins 1 to 4. Specifically, as shown in FIG. 3A and FIG. 4, the slit-containing base plate 5 corresponds to the two slits 5-1 corresponding to the two plate fins 1 and the two plate fins 2. Two slits 5-2, two slits 5-3 corresponding to the two plate fins 3, and one slit corresponding to the two plate fins 4 and passing through both of the two plate fins 4. A total of seven slits, 5-4, are formed.

(Multiple plate fins)
If the plate fin 1 is demonstrated to an example, the plate fin 1 is plate shape as shown in FIG. 2, a part of periphery is bend | folded and the bending part 1-1 is formed, and the bending part 1- 1 has a fin portion 1-2 which is the remaining portion. As shown in FIG. 4, the fin portion 1-2 penetrates the slit 5-1 corresponding to the plate fin 1 of the slit-containing base plate 5 from the lower surface 5a of the slit-containing base plate 5 toward the upper surface 5b, thereby forming the slit 5- Stick out from one. In addition, among the bent portions 1-1 of the plate fin 1, an upper surface 1b that is a surface on which the fin portion 1-2 protrudes is disposed to face the lower surface 5a of the slit-containing base plate 5. The same applies to the other plate fins 2 to 4. As shown in FIG. 4, each plate fin of the plurality of plate fins has a fin portion protruding from a corresponding slit among the plurality of slits of the slit base plate 5, and the upper surface of the bent portion is the lower surface 5 a of the slit base plate 5. It is arrange | positioned facing.

(Base plate 6)
As shown in FIGS. 3B, 4, 5, etc., the base plate 6 is plate-shaped and is larger than the total area of the lower surfaces 1 a of the bent portions of the eight plate fins. It has an area (described later in the description of FIG. 5), and the upper surface 6b covers the lower surfaces of the bent portions of the eight plate fins. The base plate 6 sandwiches the bent portions of the eight plate fins together with the slit-containing base plate 5.

(Clamping mechanism)
As shown in FIG. 1, female screw portions 21b, 22b, and 23b corresponding to male screws 21a, 22a, and 23a, male screws 21a, and the like constitute a clamping mechanism. The clamping mechanism clamps the bent portions of the plate fins between the slit-containing base plate 5 and the base plate 6. That is, as shown in FIG. 1A, the base plate 5 with slit and the base plate 6 are formed with through holes through which the male screw portions of the male screws 21a, 22a, and 23a pass. A through hole through which the male screw portion of the screws 21a, 22a, and 23a passes is formed. The male screws 21a, 22a, 23a and the like pass through these through holes and are screwed into corresponding female screw portions 21b, 22b, 23b formed in the frame 11 to fasten the base plate 5 with the slit and the base plate 6 to each other. As a result, the bent portions of the plate fins are sandwiched between the base plate 5 with slits and the base plate 6 (FIG. 4).

(Relationship between the lower surface of the bent portion and the upper surface 6b of the base plate 6)
Fig.5 (a) shows the X direction arrow view (top view) of FIG. FIG.5 (b) is the BB cross section of Fig.5 (a). As shown in FIGS. 5A and 5B, the slit-containing base plate 5 and the base plate 6 are disk shapes having substantially the same size. As shown in FIG. 5A, when viewed from above the slit base plate 5 in the direction from the upper surface 5b to the lower surface 5a of the slit base plate 5 (the X direction in FIG. 4), the respective bent portions of the eight plate fins. Is located inside the outer periphery 601 of the base plate 6 as a whole and has an outer peripheral shape of an outer periphery 701 that is slightly smaller than the outer periphery 601 of the base plate 6. Thus, since the outer periphery 601 of the base plate 6 is located outside the outer periphery 701 formed by the entire bent portion, heat is efficiently conducted from the base plate 6 to the entire bent portion.

(Relationship between base plate 6 and light source module 8 (mounting substrate))
As shown in FIGS. 4 and 5, the light source module 8 (mounting substrate) on which the plurality of LEDs 12 are mounted has a back surface 8 b that is the back side of the mounting surface 8 a on which the light source is mounted facing the lower surface 6 a of the base plate 6. A base plate 6 is attached. In this case, as shown in FIG. 4, a flexible sheet 7 (sheet material) having thermal conductivity is provided between the lower surface 6 a of the base plate 6 and the back surface 8 b of the light source module 8. Since the sheet 7 is flexible, the adhesion between the light source module 8 and the base plate 6 is enhanced via the sheet 7, so that heat conduction from the light source module 8 to the base plate 6 is improved.

  The heat sink ASSY 13 described in the first embodiment efficiently transfers the heat generated from the light source module 8 to the plate fins 1 to 4 by sandwiching the plate fins 1 to 4 (× 2) with the base plate 6 in the base plate 5 with slits. be able to. Further, the base plate 6 makes the substrate contact surface (contact surface with respect to the light source module 8) flat, and the adhesion of the light source module 8 (mounting substrate) can be improved.

  In Embodiment 1 demonstrated above, the heat sink ASSY13 aiming at the thermal radiation of the light source module 8 is comprised using a sheet-metal part, and it produces it lightweight and cheaply compared with the heat radiating member made from the conventional aluminum die-casting. be able to. Further, since the plate fins are inserted into the slit-containing base plate 5 provided with the slits, and the plurality of plate fins are held between the slit-containing base plate 5 and the base plate 6, the heat sink ASSY can be easily manufactured. Furthermore, as described in the explanation of FIG. 5, the outer periphery 601 of the base plate 6 is located outside the outer periphery 701 of the figure formed by the entire bent portion, so that heat is efficiently conducted from the base plate 6 to the entire bent portion. To do.

  In the above embodiment, the heat sink ASSY 13 used for the downlight has been described as shown in FIG. 1, but any lighting device may be used as the lighting device in which the heat sink ASSY 13 is used. Of course, the heat sink ASSY 13 can be used not only for the lighting device but also for other devices that require heat dissipation.

  In the heat sink ASSY 13 described in the above embodiment, the female screw portion formed on the frame 11 is used for the clamping mechanism, and the male screw 21a, 22a, and 23a are screwed on the lower surface 6a side of the base plate 6, respectively. Three nuts with female threads may be used. In this case, the heat sink ASSY 13 is in an assembled state without using the frame 11.

  1-4 plate fin, 5 base plate with slit, 6 base plate, 7 sheet, 8 light source module, 9 substrate holder, 10 cover, 11 frame, 12 LED, 13 heat sink assembly, 100 lighting device.

Claims (5)

A first base plate that is plate-shaped and has slits that penetrate from the lower surface to the upper surface;
A plate-shaped plate heat dissipating fin, wherein a part of the periphery is bent to form a bent portion, and the fin portion, which is the remaining portion of the bent portion, connects the slit of the first base plate to the first plate. The first base plate penetrates from the lower surface toward the upper surface and protrudes from the slit, and the upper surface of the bent portion on which the fin portion protrudes faces the lower surface of the first base plate. And plate radiating fins,
It is plate-shaped and has a larger area than the lower surface, which is the other surface of the bent portion of the plate heat dissipating fin, and the upper surface, which is one surface, covers the lower surface of the bent portion, A second base plate sandwiching the bent portion of the plate heat radiation fin together with the first base plate;
A heat sink device, comprising: a clamping mechanism that clamps the bent portion between the first base plate and the second base plate. The heat sink device is
A plurality of the plate heat dissipating fins;
The first base plate is
A plurality of the slits corresponding to each plate radiation fin of the plurality of plate radiation fins are formed,
Each plate radiation fin of the plurality of plate radiation fins is
The fin portion protrudes from the corresponding slit among the plurality of slits of the first base plate, and the upper surface of the bent portion is disposed to face the lower surface of the first base plate,
The second base plate is
The plurality of plate radiating fins have an area larger than the combined area of the lower surfaces of the bent portions, and the lower surfaces of the bent portions of the plurality of plate radiating fins are opposed to the upper surface. Covering, sandwiching each of the bent portions of the plurality of plate radiating fins together with the first base plate,
The clamping mechanism is
The heat sink device according to claim 1, wherein the bent portion of each of the plurality of plate radiating fins is sandwiched between the first base plate and the second base plate. Each of the bent portions of the plurality of plate radiating fins is
When viewed from above the first base plate in a direction from the upper surface to the lower surface of the first base plate, the second base plate is located inside the outer periphery of the second base plate as a whole. The heat sink device according to claim 2, wherein the heat sink device has an outer peripheral shape slightly smaller than the outer periphery. A heat sink device according to claim 1, a heat sink device according to claim 2, and a heat sink device according to claim 3;
An illumination apparatus comprising: a mounting surface on which a light source is mounted; and a mounting substrate attached to the second base plate so that a back side of the mounting surface faces the lower surface of the second base plate . The lighting device includes:
The lighting device according to claim 4, further comprising a flexible sheet material disposed between the lower surface of the second base plate and the back surface of the mounting substrate and having thermal conductivity.

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