JP5828133B2 - Radiation structure of lighting device - Google Patents

Description

  The present invention relates to a heat dissipation structure for a lighting device.

  Conventionally, in order to suppress the temperature rise of the light source due to heat generation, lighting devices having a heat dissipation structure have been invented. For example, an illumination device disclosed in Japanese Patent Application Laid-Open No. 2009-4131 (Patent Document 1) supports a heat sink plate in surface contact with an LED substrate that is a light source, and further supports the heat sink plate while reinforcing the plate. In addition, a metal reinforcing surface (frame) that transmits heat from the heat radiating plate to the outside is provided.

JP 2009-4131 A

  However, in the conventional lighting device disclosed in Patent Document 1, heat is radiated from the rear surface side of the light source. Moreover, in order to apply to the large illuminating device used outdoors etc., intensity | strength is calculated | required by the housing | casing of an illuminating device, Therefore, a housing | casing is often comprised with stainless steel. However, since the thermal conductivity of stainless steel is generally not so high, when the reinforcing surface (frame) of the conventional lighting device is made of stainless steel, there is a possibility that heat radiation to the outside is not efficiently performed. Although it is conceivable to use aluminum having high thermal conductivity for the reinforcing surface (frame), a large aluminum outer shell tends to be expensive. Furthermore, in the case of a large size, it is assumed that processing takes time.

  SUMMARY OF THE INVENTION The present invention solves such conventional problems, and an object of the present invention is to provide a heat dissipation structure for a lighting device that more reliably supports a light source and performs heat dissipation more efficiently.

  The heat dissipating structure of the lighting device according to the present invention includes a light source unit and a heat dissipating plate inside a housing, and the heat dissipating plate includes a light source supporting part, a lower surface supporting part, and a connecting part. The light source support part is in contact with part or all of the rear surface of the light source unit. The lower surface support portion is in contact with a surface of the inner wall of the housing that faces the rear surface of the light source unit. The connecting portion is in contact with the inner wall of the housing, has one end as a fixed end connected to the lower surface support portion, and the other end as an open end on the front side of the light source unit relative to the light source support portion. And

  The light source support portion of this heat dissipation structure may be in contact with only a part of the back surface of the light source unit. At this time, the heat radiating structure is provided with a pair of heat radiating plates, and the light source support part is brought into contact with the back surfaces of the two light source units facing each other. And the 2nd heat sink which has a 2nd light source support part which touches the part which the light source support part does not touch among the backs of a light source unit is provided. This 2nd heat sink has a 2nd lower surface support part and a 2nd connection part other than the 2nd light source support part. A 2nd lower surface support part contacts the part which the lower surface support part does not contact among the surfaces which oppose the back surface of a light source unit of the inner wall of a housing | casing. One end of the second connecting portion is connected to the second lower surface support portion and the other end is connected to the second light source support portion, thereby connecting the second light source support portion and the second lower surface support portion.

  The casing may be made of stainless steel, and the heat sink may be made of aluminum or aluminum alloy.

  In the heat dissipation structure, a high thermal conductivity material having a thermal conductivity equal to or higher than the thermal conductivity of the casing may be interposed in a contact portion between the casing inner wall and the radiator plate.

  This high thermal conductivity material may be formed of graphite sheet or silicon grease.

  The light source unit is preferably configured to have an LED light source.

  Since the light source unit is supported by the heat dissipation structure of the lighting device according to the present invention in contact with the heat dissipation plate that is in contact with two different surfaces of the housing of the lighting device, the light source is more reliably supported and the heat can be radiated more efficiently. There is.

Sectional drawing of the illuminating device using the thermal radiation structure of embodiment of this invention The perspective view inside the housing | casing 1 of the illuminating device using the thermal radiation structure of embodiment of this invention. Sectional drawing which shows the other example of the illuminating device using the thermal radiation structure of embodiment of this invention. The perspective view inside the housing | casing 1 which shows the other example of the illuminating device using the thermal radiation structure of embodiment of this invention. The top view which shows the variation of how to arrange the 2nd heat sink 4 of a pair in embodiment of this invention The perspective view which shows the example of the shape of the 2nd heat sink 4 in embodiment of this invention The perspective view which shows the other example of the thermal radiation structure of embodiment of this invention The perspective view which shows the other example of the thermal radiation structure of embodiment of this invention The perspective view which shows the other example of the thermal radiation structure of embodiment of this invention The perspective view which shows the other example of the thermal radiation structure of embodiment of this invention

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted. However, the following embodiments are merely examples of the present invention, and the present invention is not limited to this.

<Embodiment>
An embodiment of the present invention is shown in FIGS. The heat dissipation structure of the lighting device includes a light source unit 2 and a heat radiating plate 3 inside the housing 1, and the heat radiating plate 3 includes a light source support portion 31, a lower surface support portion 32, and a connecting portion 33. The light source support portion 31 is in contact with part or all of the back surface of the light source unit 2. The lower surface support portion 32 is in contact with the surface of the inner wall of the housing 1 that faces the back surface of the light source unit 2. The connecting portion 33 is in contact with the inner wall of the housing 1, has one end as a fixed end connected to the lower surface support portion 32, and the other end as an open end on the front side of the light source unit 2 with respect to the light source support portion 31. The part 31 and the lower surface support part 32 are connected.

  The light source support 31 of this heat dissipation structure contacts only a part of the back surface of the light source unit 2. At this time, the heat radiating structure is provided with a heat radiating plate 3 in a pair, and the light source support 31 is brought into contact with the back surfaces of the two opposite ends of the light source unit 2. And the 2nd heat sink 4 which has the 2nd light source support part 41 which contact | connects the part which the light source support part 31 is not contacting among the back surfaces of the light source unit 2 is provided. The second heat radiating plate 4 includes a second lower surface support portion 42 and a second connection portion 43 in addition to the second light source support portion 41. The second lower surface support portion 42 is in contact with a portion of the inner wall of the housing 1 that is not in contact with the lower surface support portion 32 of the surface facing the back surface of the light source unit 2. The second connection portion 43 has one end connected to the second lower surface support portion 42 and the other end connected to the second light source support portion 41, and the second light source support portion 41, the second lower surface support portion 42, and the like. Are connected.

  The casing 1 is made of stainless steel, and the heat sink 3 is made of aluminum or aluminum alloy.

  Further, in the heat dissipation structure, a high thermal conductivity material 5 (not shown) having a thermal conductivity equal to or higher than the thermal conductivity of the casing 1 is interposed at a contact portion between the inner wall of the casing 1 and the radiator plate 3.

  The high thermal conductivity material 5 (not shown) is formed of a graphite sheet or silicon grease.

  The light source unit 2 includes an LED light source 211.

  From here, the thermal radiation structure of the illuminating device of this embodiment is demonstrated concretely.

  As shown in FIG. 1, in the present embodiment, a light source unit 2 and a pair of heat sinks 3 made of aluminum and aluminum are used inside a box-shaped housing 1 made of stainless steel and having an upper opening. A pair of second heat sinks 4 is installed. As shown in FIG. 1, the housing 1 is formed by an open upper surface 11, a lower surface 12 that is a surface facing the upper surface 11, opposing side surfaces 13 and 13, and opposing side surfaces 14 and 14. The upper surface 11 of the housing 1 is covered with a transparent material such as transparent resin or glass. FIG. 2 is a cross-sectional view of the lighting device in a plane parallel to the side surface 14. As shown in FIG. 2, the cross-sectional shapes of the heat radiating plate 3 and the second heat radiating plate 4 in the plane parallel to the side surface 14 are shapes such as “Hi” and “Ko” of katakana, respectively.

  The radiator plate 3 has one end on the long side of the plate-like light source support portion 31 connected to one surface of the plate-like connecting portion 33, and one long side of the plate-like lower surface support portion 32 and the plate-like connecting portion. One long side of 33 is connected.

  The light source support portion 31 is plate-shaped so that the plate-shaped light source support portion 31 and the plate-like connection portion 33 are substantially orthogonal to the center side of one surface of the plate-like connection portion 33 instead of the end portion. Are connected in parallel with the long side of the connecting portion 33. The length of the long side of the light source support 31 is substantially the same as the length of the side surface 13 of the housing 1, and the length of the short side is set shorter than half the length of the side surface 14 of the housing 1. Is done. The length on the short side is preferably about 1/6 of the length of the side surface 14 of the housing 1.

  As shown in the cross-sectional view of FIG. 1, the lower surface support portion 32 is gradually changed in thickness so that the thickness on the other long side is larger than the thickness on the other long side. Note that the thickness may be gradually changed instead of stepwise. The lower surface support portion 32 is connected to the connection portion 33 so that the plate-like lower surface support portion 32 and the plate-like connection portion 33 are substantially orthogonal to each other on the longer long side. At this time, the lower surface support part 32 is connected so that it protrudes to the same surface side as the light source support part 31 of the plate-shaped connection part 33 is connected. The length of the long side of the lower surface support portion 32 is substantially the same as the length of the side surface 13 of the housing 1, and the length of the short side is set shorter than half the length of the side surface 14 of the housing 1. Is done. The length on the short side is preferably about one third of the length of the side surface 14 of the housing 1.

  In the connecting portion 33, the lower surface support portion 32 is connected to one long side, and the light source support portion 31 is connected to the center side of one surface. For this reason, the longer side where the lower surface support portion 32 is not connected is an open end that protrudes in the direction of the upper surface 11 from the light source support portion 31. The length of the long side of the connecting portion 33 is substantially the same as the length of the side surface 13 of the housing 1. The length on the short side of the connecting portion 33 is preferably substantially the same as the height of the housing 1, that is, the height of the side surface 13 and the side surface 14, but may be shorter than this. However, the length of the short side of the connecting portion 33 is set longer than the installation height of the light source unit 2 from the lower surface 12 in the housing 1. The position at which the light source support 31 is connected in the connecting portion 33 is set such that the light source unit 2 supported and installed by the light source support 31 is installed at a desired installation height.

  The light source support part 31, the lower surface support part 32, and the connection part 33 may be integrally formed, or may be connected by welding or the like after being formed separately.

  The second heat radiating plate 4 has a plate shape with one end on the long side of the plate-shaped second light source support portion 41 and one end on the long side of the plate-shaped second lower surface support portion 42. The second connecting portion 43 is configured to be connected so as to be orthogonal to both ends on the long side.

  The length of the long side of the second light source support portion 41 is substantially the same as the length of the side surface 13 of the housing 1, and the length of the short side is more than half the length of the side surface 14 of the housing 1. Is also set short. The length on the short side is preferably about one third of the length of the side surface 14 of the housing 1.

  The 2nd lower surface support part 42 is connected so that it may protrude in the same surface side as the 2nd light source support part 41 of the 2nd light-source support part 41 of the plate-shaped 2nd connection part 43 is connected. The length of the long side of the second lower surface support portion 42 is substantially the same as the length of the side surface 13 of the housing 1, and the length of the short side is more than half the length of the side surface 14 of the housing 1. Is also set short. The length on the short side is preferably about 1/6 of the length of the side surface 14 of the housing 1.

  The length of the long side of the second connecting portion 43 is substantially the same as the length of the side surface 13 of the housing 1. The length on the short side of the second connecting portion 43 is set so that the light source support portion 31 and the second light source support portion 41 have substantially the same height.

  The second light source support portion 41, the second lower surface support portion 42, and the second connection portion 43 may be integrally formed as in the case of the heat radiating plate 3, or may be formed separately and then connected by welding or the like. May be.

  The pair of two heat sinks 3 configured as described above are installed inside the housing 1 such that the lower surface support portion 32 is in contact with the lower surface 12 and the connecting portion 33 is in contact with each of the pair of side surfaces 13. . Further, the pair of the second heat radiating plates 4 configured as described above have the surfaces of the second connecting portion 43 without the second light source support portion 41 and the second lower surface support portion 42. Facing each other, the second lower surface support portion 42 is installed inside the housing 1 so as to contact the lower surface 12. At this time, as shown in the sectional view of FIG. 1, the second heat radiating plate 4 is disposed around the center of the lower surface 12, and the heat radiating plates 3 are disposed on both sides thereof. Even between the adjacent heat radiating plate 3 and the second heat radiating plate 4 and between the adjacent second radiating plates 4, pressure is exerted on each other even in a state where the respective members are thermally expanded by the heat generated by the light source unit 2. There is no distance. The lengths of the heat radiating plate 3 and the second heat radiating plate 4 mentioned here are only examples of desirable forms, and the lengths of the heat radiating plate 3 and the second heat radiating plate 4 and the balance of the lengths of each other. Is not limited to this.

In this embodiment, a graphite sheet obtained by processing graphite into a sheet shape is sandwiched between the inner wall of the housing 1 and the heat radiating plate 3 and the second heat radiating plate 4, or silicon grease used as a lubricant is applied. Thus, these materials are interposed as a high thermal conductivity material 5 (not shown). Both graphite sheet and silicon grease are materials with relatively high thermal conductivity.
The heat radiating plate 3 and the second heat radiating plate 4 are in contact with the inner wall of the housing 1 through a high thermal conductivity material 5 (not shown). Or the heat sink 3 and the 2nd heat sink 4 and the inner wall of the housing | casing 1 are made to contact directly, and the high thermal conductivity material 5 (not shown) fills the fine gap which arises in this contact part.

  On the surface on the upper side of the light source support 31 in the heat radiating plate 3 installed inside the casing 1 and on the surface on the upper surface 11 side of the second light source support 41 in the second heat radiating plate 4, the light source unit 2 Is installed. The light source unit 2 is installed so that both ends thereof are supported by the light source support portion 31 and the center portion is supported by the second light source support portion 41. As shown in FIGS. 1 and 2, the light source unit 2 includes an LED substrate 21 configured by including a plurality of LED light sources 211 and a base portion 22 on which the LED substrate 21 is installed. There may be a plurality of LED substrates 21 as shown in the figure, or a single large substrate.

  As described above, the heat dissipation structure of the lighting device according to the present embodiment uses the heat dissipation plate 3 that is in contact with the inner wall of the housing 1 and has a “H” cross section. In this heat dissipation structure, the heat generated by the light source unit 2 inside the housing 1 is transmitted to the housing 1 by the heat radiating plate 3, and the housing 1 heats the convection air in the peripheral space on its outer surface. Dissipate heat by telling. In general, when the casing is made of a material with high thermal conductivity, the casing itself can directly receive heat from the air inside the casing and dissipate it to the external space. If the conductivity is not so high, heat tends to be trapped inside the housing. In such a case, a heat radiating plate that directly touches the light source unit is often provided to assist heat dissipation. Also in this embodiment, the heat generated in the housing 1 is transmitted to the housing 1 via the heat radiating plate 3 by bringing the heat radiating plate 3 in direct contact with the light source unit 2 into contact with the housing 1. At this time, in this embodiment, since the heat sink 3 is brought into contact with not only the lower surface 12 of the housing 1 but also the side surface 13 of the housing 1, the heat of the internal space is transmitted to more surfaces of the housing 1. It is possible to improve heat dissipation efficiency.

  Moreover, in this embodiment, since the lower surface support part 32 and the connection part 33 of the heat sink 3 become the form reinforced by the surface of the housing | casing 1 which touches, the light source unit 2 is supported more reliably. Can do.

  Furthermore, in this embodiment, since the light source support part 31 is in contact with the light source unit 2 and the lower surface support part 32 and the connecting part 33 are in contact with the housing 1, there are few parts that do not touch either the heat source or the heat radiation destination. It has become. For this reason, it can be expected that the heat radiation efficiency per weight of the heat radiating plate 3 becomes higher.

  The heat dissipating structure of the lighting device of the present embodiment includes a heat dissipating plate 3 in a pair, and further includes a second heat dissipating plate 4 having a “U” cross section. Thereby, the light source unit 2 can be supported more strongly. Further, since the light source unit 2 is supported not only by the heat radiating plate 3 but also by the second heat radiating plate 4, the size of the light source support portion 31 of the heat radiating plate 3 is secured while ensuring the contact area of the heat radiating plate on the back surface of the light source unit 2. The length (the length on the short side) can be reduced. That is, since it is possible to reduce the size of the parts, the cost may be reduced depending on the scale of the lighting device.

  Since the heat dissipation structure of the lighting device of this embodiment includes the second heat dissipation plate 4 in a pair, the structure is symmetrical and the light source unit 2 can be supported more stably.

  The casing 1 used for the heat dissipation structure of the lighting device is made of stainless steel, and the heat sink 3 and the second heat sink 4 are made of aluminum or aluminum alloy. For this reason, the housing | casing 1 with high intensity | strength and the heat sink with high heat conductivity are realizable.

  Furthermore, the heat dissipation structure of the lighting device of the present embodiment has a contact portion between the inner wall of the housing 1 and the heat sink 3 or between the inner wall of the housing 1 and the heat sink 3 and the inner wall of the housing 1 and the second heat sink 4. A high thermal conductivity material 5 (not shown) having a thermal conductivity equal to or higher than the thermal conductivity of the housing 1 is interposed. Thereby, the gap which arises in the contact part of the housing 1 inner wall, the heat sink 3, and the second heat sink 4 can be filled, and the gap can be reduced. Usually, air exists in the gap, which may deteriorate the efficiency of heat transfer from the heat radiating plate 3 and the second heat radiating plate 4 to the housing 1. In the present embodiment, since the gap is reduced, it can be expected that the efficiency of heat dissipation is further increased.

  In the present embodiment, the high thermal conductivity material 5 (not shown) is formed of a graphite sheet or silicon grease, so that it can be easily assembled.

  The light source unit 2 according to the present embodiment includes an LED light source 211. By using a long-life LED, it is possible to reduce the frequency of maintenance, which is particularly effective when the lighting device is installed outdoors or at a high place. Further, since the LED has a relatively good luminous efficiency and the light emitting part is relatively compact, it can be expected to realize energy saving and space saving. Furthermore, since the LED can be configured so as to be capable of light control and color control, the color and brightness of the light can be changed without replacing the light source.

  In the present embodiment, the high thermal conductivity material 5 (not shown) is a graphite sheet or silicon grease, but other materials may be used as long as they have better thermal conductivity or heat transfer coefficient than air.

  Moreover, it is good also as a structure which does not use this high thermal conductivity material 5 (not shown).

  In the present embodiment, the housing 1 is made of stainless steel, and the heat sink 3 is made of aluminum or an aluminum alloy, but may be made of other materials.

  In the present embodiment, the second heat radiating plates 4 are arranged back to back in the direction along the side surface 14, but they may be installed in opposite directions as shown in FIG. 3, for example, as shown in FIG. These may be arranged in a direction along the side surface 13. FIG. 5 shows a plan view viewed from the second light source support portion 41 side. For example, in the case where the second connection portions 43 are arranged in a direction along the side surface 13, the second connection portion 43 is orthogonal to the side surface 13 (this embodiment also). (This shape) or the second connecting portion 43 may be parallel to the side surface 13. The second heat radiating plate 4 may be a plurality of pairs instead of a pair. Also, instead of a pair, one or three may be used.

  The second heat radiating plate 4 does not have to have the shape as in the present embodiment. For example, a shape like an I-shaped steel or a shape in which a square tube is laid as shown in FIG. 6 may be used. .

  The second heat radiating plate 4 may be omitted, and may be configured with only the heat radiating plate 3 as shown in FIG.

  In the present embodiment, a pair of heat sinks 3 are provided, but as shown in FIG. 8, a plurality of pairs may be formed by being divided into a plurality of pieces in the direction along the side surface 13. Moreover, as shown in FIG. 9, it may be a cantilever state instead of a pair. Furthermore, as shown in FIG. 10, you may use the heat sink 3 from which the shape of length etc. differs in the one surface side of the side surface 13, and the other surface side.

  In the present embodiment, the light source unit 2 includes the LED light source 211, but may be configured using a light source other than the LED.

DESCRIPTION OF SYMBOLS 1 Case 2 Light source unit 211 LED light source 3 Heat sink 31 Light source support part 32 Lower surface support part 33 Connection part 4 2nd heat sink 41 2nd light source support part 42 2nd lower surface support part 43 2nd connection part

Claims (5)

A heat dissipating structure of a lighting device including a light source unit and a heat sink inside a housing,
The heat radiating plate is in contact with a light source support part in contact with a part of the back surface of the light source unit, a lower surface support part in contact with a surface of the inner wall of the housing facing the back surface of the light source unit, and an inner wall of the housing. A connection for connecting the light source support and the bottom support with one end as a fixed end connected to the bottom support and the other end as an open end on the front side of the light source unit with respect to the light source support. and parts, the possess,
The heat radiating plate is provided in a pair, and the light source support portion is brought into contact with the back surfaces of the two light source units facing each other,
A second heat radiating plate having a second light source support portion in contact with a portion of the rear surface of the light source unit that is not in contact with the light source support portion;
The second heat radiating plate has a second lower surface support portion in contact with a portion of the inner wall of the housing that faces the back surface of the light source unit, the lower surface support portion not contacting, and one end of the second heat radiation plate. A second connection portion that connects the other light source support portion and the second lower surface support portion with the other end connected to the second light source support portion. A heat dissipating structure for a lighting device. The heat radiating structure for a lighting device according to claim 1 , wherein the casing is made of stainless steel, and the heat radiating plate is made of aluminum or an aluminum alloy. Wherein the contact portion of the housing wall and the radiating plate, the heat conductivity of the lighting device according to claim 1 or 2, characterized in that interposing a thermal conductivity of more high thermal conductivity material of the housing Heat dissipation structure. The heat dissipation structure for a lighting device according to claim 3 , wherein the high thermal conductivity material is formed of a graphite sheet or silicon grease. The said light source unit has an LED light source, The heat dissipation structure of the illuminating device in any one of Claims 1-4 characterized by the above-mentioned.

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