JP2013251056A - Heat sink, and lighting fixture equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain heat sinks, and a lighting fixture equipped with the same, which can be coupled with each other without use of other component by making the heat sink have a structure provided with a male screw and a female screw.SOLUTION: An outer periphery edge part of an underside cylindrical part 13 of a heat sink 100 and an inner periphery edge part of a main-body top-face concave part 20 of a heat sink 100 are put together, and the upper heat sink is rotated with the center of a heat sink plate opening part 10a as a rotating center while it is pressed downward, whereby, a male screw part 13a and a body female screw part 20a are screwed together. Thus, the heat sinks 100 and a lighting fixture body 101 are detachably coupled with each other.

Description

  The present invention relates to a heat sink and a lighting fixture including the heat sink, and more particularly to a heat sink structure capable of changing a heat radiation area.

  Conventionally, a heat sink has been used as a means for radiating heat generated from a lighting fixture. And this heat sink changes the heat dissipation area by changing the size of the heat sink or adjusting the height of the fin part formed on the heat sink in order to obtain the effective heat dissipation effect of the lighting fixture, The shape of the heat sink is determined in accordance with the characteristics of the lighting fixture, and an effective heat dissipation action is obtained.

  In addition, since the shape and size of the heat sink varies depending on the type of lighting fixture, if the types of lighting fixtures increase, a heat sink having a shape corresponding to each type is required. Moreover, in heat sinks, such as LED lighting fixtures, when increasing light quantity, in order to raise the heat dissipation effect of LED, it is necessary to enlarge a heat sink and to increase a thermal radiation area. On the contrary, the improvement of the thermal performance of the LED reduces the problem of heat generation, and if you want to make it smaller than the size of the current heat sink installed, you need to separately process and mold the downsized heat sink come.

  From such a problem, a coupling fin in which one heat sink is formed by screwing each heat radiating fin with each radiating fin forming the heat sink as a separate member has been proposed (for example, Patent Document 1). reference). This is to increase or decrease the number of heat dissipating fins according to the heat dissipating characteristics required by the heat dissipating object, to obtain the optimum heat dissipating performance, and to eliminate the need to newly remanufacture the entire heat sink.

Japanese Patent Laid-Open No. 10-126076 (page 3-4, FIGS. 1 and 3)

However, the heat sink described in Patent Document 1 has a problem that the number of parts is increased because the heat radiating fins are coupled with screws.
Moreover, since each radiation fin is couple | bonded by several screws, there also existed a problem that workability | operativity was bad to increase / decrease a radiation fin.
Furthermore, when reducing the number of heat radiation fins, there is a lower limit to the number that can be reduced due to the physical shape of the heat radiation fins. When increasing the number of heat radiation fins, The contact surface of the heat sink sometimes becomes large, which hinders physical coupling and results in the problem that efficient heat dissipation performance cannot be obtained.

The present invention has been made to solve the above-described problems. The first object of the present invention is to allow the heat sinks to be connected to each other without using other parts by using a male screw / female screw structure. It is to obtain a heat sink and a lighting fixture including the heat sink.
And the 2nd objective is to obtain a heat sink and a lighting fixture provided with the same with which the area of the contact surface with respect to a heat dissipation object does not change, even if it combines or separates heat sinks.

  The heat sink according to the present invention is a heat sink that is detachable from the luminaire main body, has a fin portion that radiates heat generated from the light source of the luminaire main body, has a cylindrical shape, and has an internal thread on the inner peripheral surface on one end side. A cylindrical portion in which a female screw forming portion is formed and a male screw is formed on the outer peripheral surface on the other end side, a support body that supports the fin portion and the cylindrical portion, and the cylinder The male screw forming portion of the main body is a main body female screw forming portion formed by subjecting the inner peripheral surface of the recess formed in the flat portion of the lighting fixture main body to a female screw processing, or another cylindrical portion of the heat sink. The internal thread forming portion can be detachably coupled by being screwed, and the internal thread forming portion of the cylindrical portion can be detachably coupled by being threaded to the external thread forming portion of another heat sink. .

  According to the present invention, the internal thread forming portion is formed on one end side of the cylindrical portion, and the external thread forming portion is formed on the other end side. In addition, it is possible to detachably connect another heat sink to the heat sink, so that the heat sink having a dedicated size can be selected according to the light amount or heat generation amount of the light source of the luminaire body. It is possible to change the heat radiation area by increasing / decreasing the number of heat sinks to be coupled without manufacturing.

  Moreover, since a heat sink and a lighting fixture main body, or heat sinks can be combined without using other components, the number of components can be suppressed.

  Then, only by rotating the heat sink, the light fixture main body or another heat sink can be screwed and coupled, so that the workability of increasing or decreasing the heat sink is dramatically improved.

It is the external appearance perspective view seen from the side in which the fin part 12 was formed in the heat sink 100 which concerns on Embodiment 1 of this invention. It is the external appearance perspective view seen from the side in which the fin part 12 is not formed in the heat sink 100 which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the lighting fixture 110 which concerns on Embodiment 1 of this invention. It is principal part sectional drawing in the side view of the lighting fixture 110 which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the coupling | bonding of the two heat sinks 100 which concern on Embodiment 1 of this invention.

Embodiment 1 FIG.
(Structure of heat sink 100)
1 is an external perspective view of the heat sink 100 according to Embodiment 1 of the present invention as viewed from the side where the fin portion 12 is formed, and FIG. 2 is the side where the fin portion 12 is not formed in the heat sink 100. It is the external appearance perspective view seen from. Hereinafter, the structure of the heat sink 100 will be described with reference to FIGS. 1 and 2. In the following description, the direction in which the fin portion 12 is formed in the heat sink plate 10 shown in FIG.

  As shown in FIG. 1, the heat sink 100 according to the present embodiment includes a disc-shaped heat sink plate 10 formed of a material having high thermal conductivity such as aluminum, and the heat sink plate 10 is provided at the center of the heat sink plate 10. The heat sink plate opening 10a is formed in a circular shape. A cylindrical upper surface side cylindrical portion 11 is erected from the peripheral edge of the heat sink plate opening 10a upward. Further, a plurality of fin-shaped fin portions are radially formed from the outer peripheral surface of the upper surface side cylindrical portion 11 until it reaches the peripheral edge of the heat sink plate upper surface 10b while being in contact with the upper surface of the heat sink plate 10 (heat sink plate upper surface 10b). 12 is extended and the fin part 12 is formed so that it may become substantially perpendicular | vertical with respect to the heat sink board upper surface 10b. At this time, the upper surface of the upper surface side cylindrical portion 11 and the upper surface of the fin portion 12 (fin surface 12a) are flush with each other so as to be substantially parallel to the heat sink plate upper surface 10b.

  In addition, side opening portions 11b are formed between the extended portions of the fin portions 12 on the side peripheral surface of the upper cylindrical portion 11 where the fin portions 12 are extended. By the perforation of the side opening 11b, air flows in the direction from the inside of the upper cylindrical portion 11 toward the wall surface of the fin portion 12 via the side opening 11b, or in the opposite direction. Heat dissipation performance can be demonstrated.

  Further, on the inner peripheral surface on the upper end side of the upper surface side cylindrical portion 11, a female screw forming portion 11a subjected to female screw processing is configured.

  As shown in FIG. 2, a cylindrical lower surface side cylindrical portion 13 is erected on the heat sink plate lower surface 10 c of the heat sink plate 10 from the periphery of the heat sink plate opening 10 a downward. On the side surface of the lower surface side cylindrical portion 13, a male screw forming portion 13a subjected to male screw processing is configured. Here, the screw pitch of the aforementioned female screw forming portion 11a and the screw pitch of the male screw forming portion 13a are the same.

  The upper surface side cylindrical portion 11 and the lower surface side cylindrical portion 13 correspond to the “cylindrical portion” of the present invention, and the heat sink plate 10 corresponds to the “support” of the present invention.

(About the structure of the lighting fixture 110 and the coupling | bonding aspect of the heat sink 100)
FIG. 3 is an exploded perspective view of the lighting fixture 110 according to Embodiment 1 of the present invention, and FIG.
As illustrated in FIG. 3, the lighting fixture 110 according to the present embodiment is a so-called downlight, and includes a lighting fixture main body 101. The luminaire main body 101 is formed by aluminum die casting or the like, and has a hollow cylindrical shape and a side cross section having a trapezoidal shape. . The diameter of the lower surface opened here is formed to be larger than the diameter of the upper surface.

  A circular main body upper surface recess 20 is formed in the center of the heat sink contact surface 21a, which is the upper surface of the main body upper surface plate 21, and the inner peripheral surface of the main body upper surface recess 20 is subjected to internal thread processing. The main body female screw forming portion 20a is configured. Further, the outer diameter of the lower surface side cylindrical portion 13 formed on the heat sink plate lower surface 10 c of the heat sink plate 10 and the inner diameter of the main body upper surface recess 20 formed on the heat sink contact surface 21 a of the main body upper surface plate 21 are as follows. The screw pitch of the main body female screw forming portion 20a and the screw pitch of the male screw forming portion 13a are the same.

  Moreover, the flange part 25 is formed in the opening part of the lower surface of the lighting fixture 110 in the shape of a flange toward the outer side from the peripheral part. Here, the flange portion 25 is fixed to a hole opened in the ceiling of the irradiation side space by a leaf spring (not shown) installed on the side surface or the like of the lighting fixture 110, whereby the entire lighting fixture 110 is ceiling-mounted. It will be fixed to.

  As shown in FIG. 4, a reflection surface 24 is formed on the inner surface of the luminaire main body 101, and the LED substrate 22 on which the LEDs are mounted and the translucent property are formed inside the luminaire main body 101. A cover 23 is accommodated.

The LED substrate 22 is a substrate such as an aluminum substrate, an iron substrate, a glass epoxy substrate, or a paper phenol substrate, on which one or a plurality of LEDs (not shown) are mounted. The LED substrate 22 is installed such that the mounting surface faces downward, and the back surface of the mounting surface is in contact with the LED substrate mounting surface 21b which is the lower surface of the main body upper surface plate 21. The LED substrate 22 is preferably a metal substrate from the viewpoint of heat dissipation. However, when the LED substrate 22 is not a metal substrate, by increasing the area of the copper foil, or by providing a copper foil on the non-mounting surface of the LED as a double-sided substrate, and providing a thermal via between the mounting surface side, The heat dissipation can be improved.
The LED board 22 is installed so that its mounting surface faces downward, and the back surface of the mounting surface is in contact with the LED board installation surface 21b. By installing a heat radiation sheet such as acrylic, silicon or elastomer, heat radiation grease, or heat radiation double-sided tape between the LED board 22 and the LED board 22, the thermal resistance between the main body upper surface plate 21 and the LED board 22 is reduced. It becomes possible to reduce and to improve heat dissipation.

  The translucent cover 23 is formed of transparent or translucent resin or glass, and has a function of covering and protecting the mounting surface of the LED substrate 22 from below and controlling light emitted from the LEDs. As a specific method for controlling this light, a light diffusing material is added to the translucent cover 23 to provide a diffusing function, or the surface shape of the translucent cover 23 is made a lens shape to provide a condensing function. Alternatively, there is a method of providing a diffusion function by applying a texture to the surface of the translucent cover 23.

  As described above, the reflection surface 24 is formed on the inner surface of the luminaire main body 101 and has a function of reflecting light emitted from the LEDs mounted on the LED substrate 22. Further, the reflective surface 24 can be subjected to a desired light distribution control by performing a surface treatment according to the light distribution of the light emitted from the LED.

Next, attachment of the heat sink 100 to the lighting fixture body 101 will be described with reference to FIGS. 3 and 4.
As described above, the lower surface side cylindrical portion 13 of the heat sink 100 is formed with the male screw forming portion 13a, and the main body upper surface recessed portion 20 of the lighting fixture main body 101 is formed with the main body female screw forming portion 20a. Accordingly, by aligning the outer peripheral edge portion of the lower surface side cylindrical portion 13 and the inner peripheral edge portion of the main body upper surface recessed portion 20 and pressing the heat sink 100 downward, the center of the heat sink plate opening portion 10a is rotated around the rotation center, thereby providing a male screw. The forming portion 13a and the main body female screw forming portion 20a are screwed together, and the heat sink 100 and the lighting fixture main body 101 are detachably coupled. As a result, the heat sink plate lower surface 10c of the heat sink 100 and the heat sink contact surface 21a of the luminaire main body 101 come into contact with each other, so that the heat generated from the LEDs mounted on the LED substrate 22 is transferred to the main body upper plate 21. Therefore, the heat can be efficiently conducted to the heat sink 100 and radiated to the outside. Furthermore, as shown in FIG. 4, the diameter of the heat sink plate 10 of the heat sink 100 and the diameter of the main body upper surface plate 21 of the luminaire main body 101 are made substantially the same, thereby generating from the LEDs mounted on the LED substrate 22. It is possible to more efficiently conduct the heat to the heat sink 100 through the main body upper surface plate 21.

FIG. 5 is a view for explaining the coupling of the two heat sinks 100 according to the first embodiment of the present invention. In the heat sink 100, a male screw forming portion 13 a is formed on the lower surface side cylindrical portion 13, and a female screw forming portion 11 a is formed on the upper surface side cylindrical portion 11. Therefore, for example, as described above, the internal thread forming portion 11a of the upper surface side cylindrical portion 11 of the heat sink 100 coupled to the luminaire main body 101 and the lower surface side cylindrical portion 13 of the second heat sink 100 different from the heat sink 100 are included. The male screw forming portion 13a and the female screw forming portion 11a are screwed together by rotating the center of the heat sink plate opening 10a around the center of rotation while pressing the second heat sink 100 downward. Then, the heat sink 100 coupled to the lighting fixture body 101 and the second heat sink 100 are detachably coupled. At this time, as described above, the upper surface of the upper cylindrical portion 11 and the fin portion upper surface 12a of the heat sink 100 are formed to be flush with each other. The upper surface of the side cylindrical portion 11 and the fin portion upper surface 12 a come into contact with the heat sink plate lower surface 10 c of the second heat sink 100. As a result, the heat generated from the LED mounted on the LED substrate 22 and conducted to the heat sink 100 coupled to the luminaire main body 101 is efficiently conducted to the second heat sink 100 and radiated. FIG. 4 shows a state in which the third heat sink 100 is coupled to the second heat sink 100 by the same method.
The lighting fixture 110 shown in FIG. 3 and FIG. 4 is one in which three heat sinks 100 are coupled to the lighting fixture main body 101, but is not limited to this. What is necessary is just to determine the quantity of the heat sink 100 couple | bonded according to the emitted-heat amount.

  The heat sink contact surface 21a corresponds to the “planar portion of the lighting fixture body” of the present invention.

(Effect of Embodiment 1)
With the above-described configuration, the main body female thread forming portion 20a is formed in the main body upper surface concave portion 20 for the lighting fixture main body 101, the female screw forming portion 11a is formed in the upper surface side cylindrical portion 11 for the heat sink 100, and the lower surface Since the male thread forming portion 13a is formed in the side cylindrical portion 13, the heat sink 100 can be detachably coupled to the luminaire main body 101 while being rotated and screwed. Can be detachably coupled while screwing together. Therefore, it is possible to change the heat radiation area by increasing or decreasing the number of heat sinks 100 to be coupled without producing a heat sink of a dedicated size according to the light amount or heat generation amount of the LED on the LED substrate 22. Become.

  Moreover, since the heat sink 100 and the luminaire main body 101 or the heat sinks 100 can be coupled without using other components, the number of components can be suppressed.

  In addition, as described above, only by rotating the heat sink 100, the light fixture main body 101 or another heat sink 100 can be screwed and coupled, so that the workability of increasing / decreasing the heat sink 100 is greatly improved.

  Even when the heat sink 100 is increased or decreased, only the heat sink plate lower surface 10c of the lowermost heat sink 100 is in contact with the laminated heat sink 100 with respect to the luminaire main body 101. It is possible to ensure a constant area of the abutting surface with respect to the luminaire main body 101), and to obtain efficient heat dissipation performance.

  In addition, since the heat sink plate lower surface 10c of the heat sink 100 and the heat sink contact surface 21a of the luminaire main body 101 are in contact with each other, the heat generated from the LEDs mounted on the LED substrate 22 is transmitted via the main body upper plate 21. Thus, it is possible to efficiently conduct heat to the heat sink 100 and dissipate heat to the outside. Furthermore, by making the diameter of the heat sink plate 10 of the heat sink 100 substantially the same as the diameter of the main body upper surface plate 21 of the lighting fixture main body 101, the heat generated from the LEDs mounted on the LED substrate 22 can be reduced. It is possible to conduct heat to the heat sink 100 more efficiently via the.

  As described above, since the upper surface of the upper cylindrical portion 11 and the fin portion upper surface 12a of the heat sink 100 are formed in a flush state, the upper surface of the upper cylindrical portion 11 of the heat sink 100, and The fin portion upper surface 12a comes into contact with the heat sink plate lower surface 10c of the heat sink 100 coupled to the upper portion thereof. As a result, heat generated from the LEDs mounted on the LED substrate 22 and conducted to the lower heat sink 100 is efficiently conducted to the upper heat sink 100 and radiated.

  As shown in FIG. 1, the shape of the heat sink 100 is such that a plurality of fin portions 12 extend radially from the side surface of the upper surface side cylindrical portion 11, but is not limited thereto. For example, the fin portions may be arranged in parallel, or the fin portions may be arranged in a mesh shape, and the female screw forming portion 11a and the male screw forming portion 13a are formed as shown in FIG. As long as it can be combined so as to have a laminated structure.

  Further, as shown in FIG. 3, the heat sinks 100 to be stacked are all of the same shape, but are stacked by combining heat sinks of different shapes (for example, different fin shapes or arrangements thereof). It is good also as what to do.

  Further, as shown in FIG. 1, the upper surface of the upper cylindrical portion 11 and the fin upper surface 12 a of the heat sink 100 are formed to be flush with each other, and the upper surface of the upper cylindrical portion 11 of the heat sink 100 is The fin portion upper surface 12a is in contact with the heat sink plate lower surface 10c of the heat sink 100 coupled to the upper portion, but is not limited thereto. In other words, it is not always necessary to bring the entire upper end surface of the heat sink into contact with the upper heat sink, and at least a part of the upper end surface of the heat sink contacts the upper heat sink as long as the desired heat dissipation performance is obtained. It is good also as what makes it.

  Moreover, although the light source of the lighting fixture main body 101 is LED, it is not limited to this, An incandescent bulb or a discharge lamp and other light sources may be sufficient.

  DESCRIPTION OF SYMBOLS 10 Heat sink board, 10a Heat sink board opening part, 10b Heat sink board upper surface, 10c Heat sink board lower surface, 11 Upper surface side cylindrical part, 11a Female thread formation part, 11b_ Side opening part, 12 Fin part, 12a Fin part upper surface, 13 Lower surface side cylindrical part , 13a Male thread forming portion, 20 Main body upper surface recessed portion, 20a Main body female screw forming portion, 21 Main body upper surface plate, 21a Heat sink contact surface, 21b LED substrate installation surface, 22 LED substrate, 23 Translucent cover, 24 Reflective surface, 25 Flange Part, 100 heat sink, 101 lighting fixture body, 110 lighting fixture.

Claims (6)

A heat sink that can be freely attached to and detached from the luminaire body,
A fin portion for radiating heat generated from the light source of the lighting fixture body;
A cylindrical portion having a cylindrical shape, with an internal thread formed on the inner peripheral surface on one end side to form an internal thread forming portion, and an external thread formed on the outer peripheral surface on the other end side to configure an external screw forming portion;
A support for supporting the fin portion and the cylindrical portion;
The male screw forming portion of the cylindrical portion is a main body female screw forming portion formed by subjecting an inner peripheral surface of a recess formed in a flat portion of the lighting fixture main body to a female screw processing, or the cylinder of another heat sink. It can be detachably coupled by screwing into the female thread forming part of the part,
The heat sink, wherein the female screw forming portion of the cylindrical portion can be detachably coupled by being screwed into the male screw forming portion of another heat sink. The support is
Presents a plate shape,
The cylindrical part is supported in the center so that the central axis of the cylindrical part is perpendicular to the plate surface,
The fin portion is formed on one surface of the plate surface,
When the male thread forming portion of the cylindrical portion is screwed and coupled to the female thread forming portion of the cylindrical portion of another heat sink, the other surface of the plate surface is formed on another heat sink. The heat sink according to claim 1, wherein the heat sink is in contact with at least a part of an end portion of the fin portion opposite to the support body or the flat portion of the luminaire main body. When the male thread forming portion of the cylindrical portion is screwed and coupled to the female thread forming portion of the cylindrical portion of another heat sink, the other surface of the support is formed on another heat sink. The heat sink according to claim 2, wherein the fin portion is in contact with the entire end portion of the heat sink opposite to the support body. The shape of the said plate | board surface of the said support body is substantially the same as the surface shape of the said plane part of the said lighting fixture main body couple | bonded. The heat sink of Claim 2 or Claim 3 characterized by the above-mentioned. The fin portion is erected so as to be substantially perpendicular to the one surface of the support, and extends radially from the side surface of the cylindrical portion,
The heat sink according to any one of claims 2 to 4, wherein an opening is formed between the extended portions of the fin portions on the side surface of the cylindrical portion. The lighting fixture body;
One or a plurality of the heat sinks detachably connectable to the lighting fixture body and the heat sink according to any one of claims 1 to 5;
A lighting fixture characterized by comprising:

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