JP2012256779A - Heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink using a paper sheet, excellent in heat dissipation characteristics and capable of manufacturing at low cost.SOLUTION: The heat sink is made in a three-dimensional shape by at least one molding method out of (i) bending molding (including bending molding in a curved-surface shape) and (ii) notching processing and bending molding of the notching processing part (including bending molding in a curved-surface shape) of powder for giving a sheet thermal conductivity and/or a paper sheet added with fiber. A part of the paper sheet constitutes a heat receiving part 1 which comes into surface contact with a member on a heat generation source side, and the other parts constitute a heat dissipation part 2.

Description

  The present invention relates to a paper heat sink that can be used for heat radiation of various heat sources including a semiconductor element.

2. Description of the Related Art Conventionally, heat sinks have been widely used for radiating various heat sources including semiconductor elements, and are also used in lighting fixtures using light emitting diodes (LEDs) that are rapidly spreading in recent years.
Electronic devices using semiconductor elements are required to be smaller, lighter, lower cost and higher in productivity, and the same is required for heat sinks used for semiconductor elements. However, since the main material of the conventional heat sink is a metal such as aluminum or copper and is hard and heavy, there is a limit to downsizing, weight reduction, cost reduction, and productivity improvement.

In contrast to such a conventional heat sink, Patent Document 1 discloses a heat sink in which a paper sheet in which a heat conductive powder is added to a fiber is zigzag bent into a heat radiation fin, and the heat radiation fin is fixed to the heat conduction member. (Radiator) is shown.
Although this heat sink has inferior thermal characteristics to a metal heat sink, it has a great advantage that cannot be realized with a metal heat sink in terms of size reduction, weight reduction, and cost reduction.

JP 2011-54689 A

  However, the heat sink disclosed in Patent Document 1 does not have an integral structure of the heat radiating portion (heat radiating fin) and the heat receiving portion (heat conducting member), and the heat radiating fin made of a paper sheet bent in a zigzag shape is point contacted to the heat conducting member. Therefore, there is a drawback in that the heat transfer is poor, and therefore the thermal conductivity is low and sufficient heat dissipation characteristics cannot be obtained. Moreover, since the process of adhering the point contact part of the radiation fin with respect to a heat conductive member with an adhesive agent is required, manufacturing cost also becomes high.

  Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a heat sink using a paper sheet, which has excellent heat dissipation characteristics and can be manufactured at low cost.

The gist of the present invention for solving the above problems is as follows.
[1] One paper sheet to which powder or / and fibers for imparting thermal conductivity to the sheet are added, (i) bending (including the case of bending into a curved surface), (ii ) A heat sink that is formed into a three-dimensional shape by one or more forming methods of cutting and bending of the cut portion (including the case of bending into a curved surface), and a part of the paper sheet generates heat. A heat sink comprising a heat receiving part (1) in surface contact with a source side member and the other part constituting a heat radiating part (2).
[2] In the heat sink of [1], the paper sheet is a heat sink formed by bending a corrugated valley bottom into a corrugated plate shape, and the paper sheet portion (a) at the valley bottom is a heat receiving portion (1). And the other paper sheet part (b) constitutes the heat radiating part (2).

[3] In the heat sink of [1] above, a portion on one end side in the longitudinal direction of the paper sheet is bent into a corrugated plate shape in which each corrugated valley bottom is flat, and a portion on the other end side in the longitudinal direction of the paper sheet ( c) is a heat sink which is bent and formed and folded back to the trough side of the corrugated sheet to be in close contact with the bottom of the trough, and the paper sheet part (c) and the paper sheet part (a) at the bottom of the trough are heat receiving parts. A heat sink comprising (1) and the other paper sheet portion (b) constituting the heat radiating portion (2).
[4] A heat sink according to the above [2] or [3], wherein a pair of opposed paper sheet portions constituting each crest of the corrugated plate are in close contact with each other.
[5] The heat sink of [1] above, wherein a portion (d) at both ends in the longitudinal direction of the paper sheet is bent and formed in one direction, and a flat paper sheet portion (e) at the center side Constitutes a heat receiving portion (1), and the paper sheet portion (d) constitutes a heat radiating portion (2).

[6] The heat sink according to [5], wherein the paper sheet portion (d) has one or more bent portions in the middle of the height direction.
[7] In the heat sink of [1] above, a heat sink in which at least three paper sheet portions (f) of a polygonal paper sheet are bent and raised in one direction, and a flat paper sheet on the center side The heat sink, wherein the part (g) constitutes a heat receiving part (1) and the paper sheet part (f) constitutes a heat radiating part (2).
[8] The heat sink according to [7], wherein a plurality of slit grooves are provided in the paper sheet portion (f) at intervals along the longitudinal direction.
[9] In the heat sink of [1] above, a paper sheet is bent into a corrugated shape with flat corrugated bottoms, and the compact is folded into a cylindrical shape so that the bottom of the corrugation is inside the cylinder. The heat sink is characterized in that the paper sheet portion (a1) at the bottom of the valley constitutes the heat receiving portion (1) and the other paper sheet portion (b1) constitutes the heat radiating portion (2).

[10] In the heat sink of [1] above, a portion on one end side in the longitudinal direction of the paper sheet is bent into a corrugated shape having a flat corrugated bottom, and a portion on the other end side in the longitudinal direction of the paper sheet ( c1) is bent and folded back to the trough side of the corrugated sheet to bring it into close contact with the bottom of the trough, and the molded body is bent into a cylinder so that the paper sheet portion (c1) is inside the cylinder. The paper sheet part (c1) and the paper sheet part (a1) at the bottom of the valley constitute the heat receiving part (1), and the other paper sheet part (b1) constitutes the heat dissipation part (2). Features heat sink.
[11] In the heat sink of [1], a portion (h) on one end side or both end sides in the paper sheet width direction is provided with a plurality of slits spaced along the longitudinal direction, and the paper sheet portion ( h) is bent and raised in one direction, and the paper sheet portion (i) in which the slit is not provided in the molded body is directed to the outer side of the cylinder. The paper sheet part (i) constitutes a heat receiving part (1) and the paper sheet part (h) constitutes a heat radiating part (2). heatsink.

[12] In the heat sink of [1], a portion (h1) on one end side or both end sides in the paper sheet width direction is provided with a plurality of slits spaced along the longitudinal direction, and the paper sheet portion ( h1) is bent and raised in one direction, and the paper sheet portion (i1) that is not provided with slits in the molded body is faced up to the spiral body. The paper sheet part (i1) constitutes a heat receiving part (1) and the paper sheet part (h1) constitutes a heat radiating part (2). heatsink.
[13] The heat sink according to [1], wherein a heat sink is formed by cutting a plurality of portions of a paper sheet and bending the cut portion to be raised in one direction. A heat sink, wherein the sheet portion (j) constitutes a heat radiating portion (2) and the other flat paper sheet portion (k) constitutes a heat receiving portion (1).

[14] In the heat sink of [1], a plurality of portions on one end side in the longitudinal direction of the paper sheet are cut, the cut portion is bent and formed in one direction, and the other in the longitudinal direction of the paper sheet. A flat paper sheet portion (k) of the one end side portion in the longitudinal direction of the paper sheet by bending the end side portion (l) and folding it back to the side opposite to the start-up forming side of the cut portion The paper sheet part (j) formed by raising and forming the notched part constitutes a heat radiating part (2), and the paper sheet part (l) and the paper sheet part (k) receive heat. A heat sink comprising the part (1).
[15] In the heat sink of [1], a plurality of portions of the paper sheet are cut, the cut portion is bent and formed in one direction, and a flat paper sheet portion (k1) of the formed body is formed. A heat sink formed by bending the paper sheet portion (j1) formed by raising the notched portion into a cylindrical shape so as to face the outside of the tube, and the paper sheet portion (j1) constitutes a heat radiating portion (2) The heat sink, wherein the paper sheet part (k1) constitutes a heat receiving part (1).
[16] The heat sink according to [1], wherein the heat sink includes a housing connecting portion fixed in a state of surface contact with the housing as a part of the heat radiating portion.

  The heat sink of the present invention is formed by forming a sheet of paper with thermal conductivity into a three-dimensional shape, and constitutes a heat receiving portion in which a part of the paper sheet is in surface contact with a member on the heat source side. Since this part constitutes a heat radiating part, it has excellent thermal conductivity and heat radiating characteristics as compared with the heat sink of Patent Document 1, and can be manufactured at a low cost because there is no extra bonding step.

The top view which shows one Embodiment of the heat sink of this invention Front view of the heat sink of the embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 1 to the member by the side of a heat source (however, it shows in the state which carried out the longitudinal cross-section of the member by the side of a heat source) (A)-(D) is a front view which shows other embodiment of the heat sink of this invention, respectively. The top view which shows other embodiment of the heat sink of this invention Front view of the heat sink of the embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 5 to the member by the side of a heat source (however, it shows in the state which carried out the longitudinal cross-section of the member by the side of a heat source) (A)-(D) is a front view which shows other embodiment of the heat sink of this invention, respectively. The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 9 to the member at the heat source side (however, it shows in the state which carried out the longitudinal cross-section of the member at the heat source side) The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 12 to the member by the side of a heat source (however, it shows in the state which carried out the longitudinal cross-section of the member by the side of a heat source) (A), (B) is a front view showing another embodiment of the heat sink of the present invention. The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 16 to the member by the side of a heat source (however, it shows in the state which carried out the longitudinal cross-section of the member by the side of a heat source) The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The front view shown in the state which attached the heat sink of embodiment of FIG. 19 to the member by the side of a heat source (however, it shows in the state which carried out the longitudinal cross-section of the member by the side of a heat source) The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 22 in the state attached to the tubular or columnar member by the side of a heat source. FIG. 22 is a front view showing a molded body obtained by bending a paper sheet into a corrugated plate shape before being folded into a cylindrical shape as shown in FIG. 22 used in the embodiment of FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 25 in the state attached to the tubular or columnar member by the side of a heat source. FIG. 25 is a front view showing a molded body obtained by bending a paper sheet into a corrugated shape used in the embodiment of FIG. 25 and before being folded into a cylindrical shape as shown in FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 28 in the state attached to the tubular or columnar member by the side of a heat source. 28 is a longitudinal sectional view showing the heat sink of the embodiment of FIG. 28 attached to a tubular or columnar member on the heat source side. FIG. 28 is a front view showing a paper sheet provided with slits before being bent into a cylindrical shape as shown in FIG. 28, used in the embodiment of FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 32 in the state attached to the tubular or columnar member by the side of a heat source. 32 is a longitudinal sectional view showing a state where the heat sink of the embodiment of FIG. 32 is attached to a tubular or columnar member on the heat source side. 32 is a front view showing a paper sheet provided with slits before being bent into a cylindrical shape as shown in FIG. 32, used in the embodiment of FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 36 in the state attached to the tubular or columnar member by the side of a heat source. 36 is a longitudinal sectional view showing the heat sink of the embodiment of FIG. 36 attached to a tubular or columnar member on the heat source side. 36 is a front view showing a paper sheet provided with slits before being folded into a spiral shape as shown in FIG. 36, used in the embodiment of FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 40 in the state attached to the tubular or columnar member by the side of a heat source. 40 is a longitudinal sectional view showing the heat sink of the embodiment of FIG. 40 attached to a tubular or columnar member on the heat source side. 40 is a front view showing a paper sheet provided with slits before being folded into a spiral shape as shown in FIG. 40, used in the embodiment of FIG. The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The side view of the heat sink of embodiment of FIG. 44 is a longitudinal sectional view of the heat sink of the embodiment of FIG. 44 is a plan view showing a paper sheet provided with an incision processing portion, which is used in the embodiment of FIG. 44, and before the incision processing portion is bent as shown in FIG. The top view which shows other embodiment of the heat sink of this invention The front view of the heat sink of embodiment of FIG. The side view of the heat sink of embodiment of FIG. 49 is a longitudinal sectional view of the heat sink of the embodiment of FIG. 49 is a plan view showing a paper sheet used in the embodiment of FIG. 49 and provided with a cut portion, and before the cut portion is bent as shown in FIG. The top view which shows other embodiment of the heat sink of this invention 54 is a longitudinal sectional view of the heat sink of the embodiment of FIG. The top view which shows other embodiment of the heat sink of this invention 56 is a longitudinal sectional view of the heat sink of the embodiment of FIG. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 58 in the state attached to the tubular or columnar member by the side of a heat source. The other embodiment of the heat sink of this invention is shown, The front view shown in the state attached to the tubular or columnar member by the side of a heat source The top view which shows the heat sink of embodiment of FIG. 60 in the state attached to the tubular or columnar member by the side of a heat source. (A), (B) is a front view showing another embodiment of the heat sink of the present invention. (A)-(C) is a front view showing another embodiment of the heat sink of the present invention. (A) shows the mounting state of the metal heat sink to a plurality of semiconductor elements having variations in height, and (A) shows the mounting state of the heat sink of the present invention to a plurality of semiconductor elements having variations in height. Illustration Explanatory drawing which shows the attachment state of the heat sink of this invention with respect to the member of the heat-source side whose surface is non-planar Drawing to explain "vertical mounting" and "horizontal mounting" of heat sink

The heat sink of the present invention is a heat sink in which one paper sheet provided with thermal conductivity is formed into a three-dimensional shape by one or more of the following (i) and (ii) molding methods, A part of the heat receiving part 1 is in surface contact with a member on the heat source side, and another paper sheet part, that is, a paper sheet part rising from the heat receiving part 1 constitutes the heat radiating part 2. Hereinafter, individual paper sheet portions that stand up from the heat receiving portion 1 and constitute the heat radiating portion 2 may be referred to as “heat radiating fins 20”.
(I) Folding (including the case of bending into a curved surface)
(Ii) Incision processing and bending of the incised portion (including the case of bending into a curved surface)

Here, there is no particular limitation on the heat source side member with which the heat receiving portion 1 of the heat sink of the present invention is in surface contact, but representative examples include semiconductor elements such as LEDs, members of appliances such as heaters and projectors, Examples include other heat sink components. Further, the heat source side member can be applied to a tubular or columnar member, and examples of the heat source side tubular or columnar member include a pipe portion of a water-cooled heat sink, a column heater, a column LED lighting device, For example, a projector light source.
The heat receiving portion 1 that is in surface contact with the member on the heat source side is a plane portion that is formed between the bent portion and the bent portion and can be in plane contact as long as it can come into surface contact with the member on the heat source side. Alternatively, it may be curved.

In the forming method (i), for example, a paper sheet is bent using a mechanical bending device or the like. In the forming method (ii) described above, for example, a gate-shaped or semi-circular shape is cut at a plurality of locations on the paper sheet, and the bending is performed so that these cut portions are raised. Here, the bending (processing) of the paper sheet in (i) and (ii) includes a case where the paper sheet is bent into a curved shape.
Further, by combining the molding methods (i) and (ii) above, for example, by performing the cutting process such as a gate shape or a semicircular shape at a plurality of locations on the paper sheet by the molding method (ii), After the bending process is performed so that the processing portion is raised, the entire paper sheet may be bent by the forming method (i).

  The paper sheet is obtained by adding a powder or / and a fiber for imparting thermal conductivity. For example, as shown in Patent Document 1, wet papermaking in which a thermal conductive powder is added to a fiber constituting paper. However, the present invention is not limited to this. The fiber constituting the paper is a cohesive string-like elongated material that is naturally stretched or artificially stretched. Specifically, natural fiber (plant fiber, animal fiber), chemical fiber (rayon) Recycled fibers such as fibers, semi-synthetic fibers such as acetate fibers, synthetic fibers such as nylon fibers, acrylic fibers and polyester fibers), inorganic fibers (glass fibers, carbon fibers, metal fibers), etc., one or more of these Can be used. From the standpoint of ensuring the bending resistance of the paper sheet, the fibers constituting the paper are preferably made mainly of plant fibers (natural pulp) or plant fibers (natural pulp) and chemical fibers. In addition to the main paper fiber as described above, the paper sheet includes binder fiber (chemical fiber) that melts by heat, and the binder fiber is melted by a hot press or the like. You may use what was added.

  Powder or / and fiber for imparting thermal conductivity to a paper sheet (hereinafter referred to as “thermal conductive powder / fiber” for convenience of explanation. Similarly, when referring only to powder, it is referred to as “thermal conductive powder”). As, for example, one or more powders or fibers of silicon nitride, aluminum nitride, magnesia, alumina silicate, silicon, iron, silicon carbide, carbon, boron nitride, alumina, silica, aluminum, copper, silver, gold, etc. are used. be able to. Usually, in order to include a heat conductive powder / fiber in a paper sheet, the heat conductive powder / fiber is added to and suspended in a papermaking slurry, and the papermaking slurry is made into a sheet.

When the heat conductive powder is used, even if the particle size is too small or too large, the adhesion of the powder to the paper fiber is likely to decrease, so the average particle size of the powder is about 0.1 to 500 μm. preferable.
When the thickness of the paper sheet is too thin, the strength is lowered. On the other hand, when the thickness is too thick, the deformability is likely to be lowered and the manufacturing cost is increased.
The thermal conductivity in the surface direction of the paper sheet is preferably 10 W / m · K or more. In order to obtain such thermal conductivity, the content of thermally conductive powder / fiber in the paper sheet is appropriately adjusted.

In the heat sink of the present invention as described above, after the heat of the member on the heat generation source is received by the heat receiving portion 1, it is transmitted to the heat radiating portion 2 (heat radiating fin 20) and radiated from the surface (heat radiating surface). . The heat sink of the present invention is formed by forming a sheet of paper with heat conductive powder and fibers into a three-dimensional shape, and constitutes a heat receiving portion 1 in which a part of the paper sheet is in surface contact with a member on the heat source side. And since the other part (the paper sheet part which rose from the heat receiving part 1) comprises the heat radiating part 2, it is excellent in thermal conductivity and a heat radiation characteristic.
The heat sink of the present invention is suitable for a heat sink of a type in which the heat radiating portion 2 (radiating fin 20) is short and radiates heat by natural cooling. This is because paper has a low thermal conductivity, and in order to ensure sufficient heat dissipation characteristics due to convection, the heat radiation portion 2 (heat radiation fin 20) is lowered and the heat receiving portion 1 and the heat radiation portion 2 are spaced from each other. This is because it is necessary to reduce the temperature difference. From such a viewpoint, the height of the heat radiating part 2 (heat radiating fin 20) is preferably 50 mm or less.

In addition, a heat sink composed of only a paper sheet to which thermally conductive powder / fiber is added as in the present invention (hereinafter referred to as a “heat sink made of paper sheet” for convenience of explanation) has the following advantages.
(1) Since the specific gravity of a heat sink made of a paper sheet is much smaller than that of a metal heat sink made of copper or aluminum, the weight of the heat sink can be reduced.
(2) Whereas metal heat sinks need to be screwed to members such as semiconductor elements and fixed with terminal solder to the board, paper sheet heat sinks are lightweight, so double-sided adhesive tapes, etc. It is possible to fix it to a member such as a semiconductor element or a substrate with this simple means. Also, the number of parts and man-hours for fixing can be reduced, and the cost can be reduced accordingly.

  (3) When heat is dissipated by a single heat sink when multiple semiconductor elements are radiated, there is a variation in height between the semiconductor elements. When using a metal heat sink, heat conduction is performed to absorb the steps between the semiconductor elements. It is necessary to use a sheet. On the other hand, a paper heat sink has low plastic deformation stress and high flexibility. Therefore, the step between semiconductor elements can be easily absorbed by deformation of the heat sink itself. In addition, when the surface of the heat source that contacts the heat sink is non-planar (a curved surface or a surface with irregular slopes, irregularities, etc.), in the case of a metal heat sink, the shape of the heat receiving part is matched to the surface shape of the member. In addition, it is necessary to secure the adhesion between the member surface and the heat sink by interposing a heat conductive sheet in order to absorb variations due to tolerances or by post-processing the heat sink side. In contrast, a paper heat sink has low plastic deformation stress and high flexibility, so that it can be in close contact with the surface of the member by deformation of the heat sink itself, and can easily absorb variations due to tolerances.

(4) Metal heat sinks are generally manufactured by methods such as (a) extrusion using a mold, (b) punching a metal plate, and then forming by bending. This method requires expensive molds (male / female) and advanced extrusion technology, and method (b) is difficult to punch out during punching and has poor productivity. On the other hand, a paper heat sink can be manufactured by a relatively simple method in which a paper sheet is punched with a relatively simple punching die (male die) and then subjected to bending or the like. At the same time, it is easy to overlap, so that it can be manufactured with high productivity and low cost.
(5) Metal heat sinks have low emissivity, and surface treatment is necessary to increase emissivity, whereas paper heat sinks have high emissivity and surface treatment to increase emissivity. There is no need.

  In the following description, “vertical mounting” of the heat sink means that the heat sink is disposed so that the heat receiving portion (heat receiving surface) and the heat radiating surface of the heat radiating fin are in a vertical state as shown in FIGS. Similarly, “horizontal mounting” refers to the case where the heat sink is arranged and mounted so that the heat receiving portion (heat receiving surface) is in a horizontal state, as shown in FIGS. This refers to the case where the heat sink is arranged and attached so that the portion (heat receiving surface) is vertical and the heat radiating surface of the heat radiating fin is horizontal.

1 to 3 show an embodiment of a heat sink according to the present invention. FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is attached to a member (for example, a semiconductor element) on the heat source side. It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
The heat sink of this embodiment is formed by bending a paper sheet into a corrugated plate shape where each corrugated valley bottom is flat, and the paper sheet portion a at the flat valley bottom constitutes the heat receiving portion 1, The other paper sheet portion b rising from the portion 1 constitutes the heat radiating portion 2 (heat radiating fin 20). The shape of the radiating fin 20 of this embodiment is a gate shape (quadrangle) in cross section, and as a whole is a so-called rectangular wave corrugated shape. As shown in FIG. 3, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side, and the heat sink is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.

FIGS. 4A to 4D show another embodiment which is a modification of the heat sink of the type shown in FIGS. 1 to 3, and are all front views of the heat sink. These heat sinks are also fixed to the member 3 with the adhesive layer 4 interposed between the heat receiving portion 1 and the heat generating source side member 3 in the same manner as in FIG.
In the embodiment of FIG. 4A, the bent portion of the heat sink shown in FIGS. 1 to 3, that is, the base end portion of the radiating fin 20 and the corner portions 5 and 6 of the ceiling portion 7 are provided with R. . The size of R is preferably about 2 to 5 times the thickness of the paper sheet.

In the embodiment of FIG. 4A, the ceiling portion 7 of the radiating fin 20 has a circular arc shape in cross section. In this embodiment, R as shown in FIG. 4A may be attached to the corner of the base end portion of the radiation fin 20.
In the embodiment of FIG. 4C, the shape of the radiating fin 20 is a triangular cross section. In this embodiment, R as shown in FIG. 4A may be attached to the base end portion of the radiating fin 20 and each corner portion of the ceiling portion 7.
In the embodiment of FIG. 4D, a paper sheet is formed by bending a corrugated valley bottom into a corrugated plate shape, but a pair of opposed paper sheet portions 8 constituting each heat dissipating fin 20. The heat dissipating part 2 is configured in a comb shape.

Since the heat sinks of the types shown in FIGS. 1 to 3 and FIGS. 4A to 4D as described above may be formed into a three-dimensional shape by continuously bending a rolled paper sheet, There are advantages that productivity is high and manufacturing costs are particularly low.
Moreover, the heat sink of FIGS. 1-3 and the heat sink of FIG. 4 (a)-(c) are the same envelope volume (envelope volume: heat sink height x width x depth), and FIG. The surface area of the heat dissipating part 2 is larger than the heat sink of (D), and each heat dissipating fin 20 has a ceiling part 7. Therefore, when installed vertically, the chimney effect (if the four sides are surrounded by high temperature walls, air The effect of promoting the convection of the water) provides excellent heat dissipation characteristics. However, since the ceiling portion 7 of the heat radiating fin 20 hinders air convection during horizontal mounting, the heat dissipation characteristics are lower than those during vertical mounting.

  In addition, when bending paper sheets with thermally conductive powder / fiber added, the thermally conductive powder / fiber tends to peel off especially at the bent part (corner), resulting in a decrease in thermal conductivity and an increase in thermal resistance (results). , Which is likely to cause a short circuit). In this respect, the heat sink of FIG. 4A is provided with R at each corner 5 and 6 of the bent portion, and the heat sink of FIG. Therefore, the heat conductive powder / fiber is hardly peeled off at the bent portion, and it is difficult for the heat conduction characteristic to be lowered and the heat resistance to be raised.

Further, in the heat sink of FIG. 4C, since the shape of the radiation fin 20 is a triangular cross section and the radiation surface is an inclined surface, the radiation surface of the radiation fin 20 is vertical as in the heat sink of FIGS. Compared to the surface, there is less radiation interference between adjacent heat radiation fins 20, and the radiation heat radiation efficiency is improved accordingly.
In addition, the heat sink of FIG. 4 (D) is perpendicular to the heat sinks of FIGS. 1 to 3 and the heat sinks of FIGS. 4 (A) to 4 (C) because the radiating fin 20 does not have a ceiling portion that hinders convection. The difference in heat dissipation characteristics between mounting and horizontal mounting can be reduced.

  In view of the above, the heat sinks shown in FIGS. 1 to 3 and the heat sinks shown in FIGS. 4A to 4C are heat sinks having particularly excellent heat dissipation characteristics during vertical mounting. It is suitable for electric equipment (for example, a TV, a refrigerator, an air conditioner, and an LED downlight) whose installation direction is determined. On the other hand, the heat sink shown in FIG. 4 (d) is a heat sink having a small difference in heat radiation characteristics between vertical mounting and horizontal mounting. For this reason, even if the heat sink mounting (installation) direction is not fixed (for example, vertically installed) Suitable for game consoles and desktop PCs that can be used horizontally, and LED spotlights that can change the direction of illumination).

5 to 7 show other embodiments of the heat sink of the present invention. FIG. 5 is a plan view, FIG. 6 is a front view, and FIG. 7 is a state where the heat sink is attached to a member (for example, a semiconductor element) on the heat source side. It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
The heat sink of this embodiment is formed by bending a portion on one end side in the longitudinal direction of the paper sheet into a corrugated shape with flat bottoms of the corrugations and bending a portion c on the other end side in the longitudinal direction of the paper sheet. Then, the paper sheet portion c and the paper sheet portion a at the bottom portion of the corrugated plate constitute the heat receiving portion 1 and rise from the heat receiving portion 1. The other paper sheet part b comprises the heat radiating part 2 (heat radiating fin 20). Similar to the embodiment of FIGS. 1 to 3, the shape of the heat dissipating fin 20 of this embodiment is a gate shape (quadrangle) in cross section, and as a whole has a so-called rectangular wave corrugated shape. As shown in FIG. 7, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side, and the heat sink is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.

FIGS. 8A to 8D show another embodiment which is a modification of the heat sink of the type shown in FIGS. 5 to 7, and are all front views of the heat sink. These heat sinks are also fixed to the member 3 with the adhesive layer 4 interposed between the heat receiving portion 1 and the heat generating source side member 3 as in FIG.
In the embodiment of FIG. 8A, the bent portion of the heat sink shown in FIGS. 5 to 7, that is, the base end portion of the radiating fin 20 and the corner portions 5 and 6 of the ceiling portion 7 are provided with R. . The size of R is preferably about 2 to 5 times the thickness of the paper sheet.

In the embodiment of FIG. 8A, the ceiling portion 7 of the radiating fin 20 has an arcuate cross section. In this embodiment, R as shown in FIG. 8A may be attached to the corner of the base end portion of the radiation fin 20.
In the embodiment of FIG. 8C, the shape of the radiating fin 20 is a triangular cross section. In this embodiment, R as shown in FIG. 8A may be attached to the base end portion of the radiating fin 20 and each corner portion of the ceiling portion 7.
In the embodiment of FIG. 8 (d), a portion on one end side in the longitudinal direction of the paper sheet is bent and formed into a corrugated plate shape in which each corrugated valley bottom is flat, and a portion c on the other end side in the longitudinal direction of the paper sheet is In this case, it is bent and folded back to the trough side of the corrugated sheet to make it closely contact the bottom of the valley. It is configured in a comb shape.

  Since the heat sinks of the types shown in FIGS. 5 to 7 and FIGS. 8A to 8D as described above can be formed into a three-dimensional shape by continuously bending a rolled paper sheet, There are advantages that productivity is high and manufacturing costs are particularly low. Furthermore, by folding the paper sheet portion c toward the trough side of the corrugated plate and overlapping the paper sheet portion a, the entire bottom portion of the heat sink becomes the heat receiving portion 1 and can receive heat from the entire surface of the member 3 on the heat source side. As a result, the heat dissipation characteristics are improved. Further, since the amount of heat transfer is proportional to the cross-sectional area of the heat sink, the amount of heat transfer increases as the cross-sectional area increases by the amount of the paper sheet portion c, and as a result, the thermal resistance decreases.

Furthermore, each heat sink of FIGS. 5 to 7 and FIGS. 8A to 8D corresponds to each of the heat sinks of FIGS. 1 to 3 and FIGS. 4A to 4D having the same corrugated plate shape. Has performance.
That is, in the heat sinks of FIGS. 5 to 7 and the heat sinks of FIGS. 8A to 8C, the heat dissipating section 2 is configured in a comb shape in the same envelope volume (envelope volume: heat sink height × width × depth). The surface area of the heat dissipating part 2 is larger than the heat sink of (D), and each heat dissipating fin 20 has a ceiling part 7. Therefore, when installed vertically, the chimney effect (if the four sides are surrounded by high temperature walls, air The effect of promoting the convection of the water) provides excellent heat dissipation characteristics. However, since the ceiling portion 7 of the heat radiating fin 20 hinders air convection during horizontal mounting, the heat dissipation characteristics are lower than those during vertical mounting.

  In addition, when bending paper sheets with thermally conductive powder / fiber added, the thermally conductive powder / fiber tends to peel off especially at the bent part (corner), resulting in a decrease in thermal conductivity and an increase in thermal resistance (results). , Which is likely to cause a short circuit). In this respect, the heat sink shown in FIG. 8A is provided with an R at each corner 5 and 6 of the bent portion, and the heat sink shown in FIG. Therefore, the heat conductive powder / fiber is hardly peeled off at the bent portion, and it is difficult for the heat conduction characteristic to be lowered and the heat resistance to be raised.

Further, in the heat sink of FIG. 8C, since the shape of the heat radiating fins 20 is a triangular cross section and the heat radiating surface is an inclined surface, the heat radiating surfaces of the heat radiating fins 20 are vertical as in the heat sinks of FIGS. Compared to the surface, there is less radiation interference between adjacent heat radiation fins 20, and the radiation heat radiation efficiency is improved accordingly.
In addition, the heat sink of FIG. 8D is vertical compared to the heat sinks of FIG. 5 to FIG. 7 and the heat sinks of FIG. 8A to FIG. The difference in heat dissipation characteristics between mounting and horizontal mounting can be reduced.

  In view of the above, the heat sinks of FIGS. 5 to 7 and the heat sinks of FIGS. 8A to 8C are heat sinks having particularly excellent heat dissipation characteristics during vertical mounting. It is suitable for electric equipment (for example, a TV, a refrigerator, an air conditioner, and an LED downlight) whose installation direction is determined. On the other hand, the heat sink shown in FIG. 8 (d) is a heat sink having a small difference in heat radiation characteristics between vertical mounting and horizontal mounting. For this reason, an electrical device having a fixed heat sink mounting (installation) direction (for example, vertical installation) Suitable for game consoles and desktop PCs that can be used horizontally, and LED spotlights that can change the direction of illumination).

9 to 11 show another embodiment of the heat sink of the present invention. FIG. 9 is a plan view, FIG. 10 is a front view, and FIG. 11 is a state attached to a member (for example, a semiconductor element) on the heat source side. It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
The heat sink of this embodiment is formed by bending and forming vertically (right angle) portions d on both ends in the longitudinal direction of the paper sheet, and the flat paper sheet portion e on the central side constitutes the heat receiving portion 1. The paper sheet portion d constitutes the heat radiating portion 2 (heat radiating fin 20). As shown in FIG. 11, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side and is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.
Note that the paper sheet portion d may be raised in one direction (upward), and therefore may be inclined rather than vertical.

  In such a heat sink, the entire bottom portion of the heat sink becomes the heat receiving portion 1 without folding the paper sheet portion like the heat sinks of FIGS. 5 to 7 and the heat sinks of FIGS. Heat can be received from the entire surface of the member 3. In addition, since the radiating fin 20 does not have a ceiling portion that hinders convection, a difference in heat radiation characteristics between vertical mounting and horizontal mounting can be reduced. Therefore, this heat sink is an electric device in which the mounting direction of the heat sink is not fixed (for example, a game machine or a desktop personal computer that can be used vertically or horizontally, an LED spotlight that can change the lighting direction, etc.) Suitable for

In the heat sink of the type shown in FIGS. 9 to 11, the paper sheet portion d can have one or more bent portions in the middle of the height direction. FIGS. 12 to 14 show an embodiment of such a heat sink. FIG. 12 is a plan view, FIG. 13 is a front view, and FIG. 14 is a state where the heat sink is attached to a member (for example, a semiconductor element). It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
In the heat sink of this embodiment, the portions d on both end sides in the longitudinal direction of the paper sheet are bent and formed vertically (at right angles), and the tip portion 9 of the paper sheet portion d is placed on the paper sheet portion e side. The paper sheet part d is bent in the horizontal direction at a right angle, and the cross-section is inverted L-shaped. That is, the paper sheet portion d of this embodiment has one (one step) bent portion 10 (a right-angle bent portion) in the middle of the height direction. As shown in FIG. 14, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side and is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.

FIGS. 15A and 15B show other embodiments of the heat sink in which the paper sheet portion d has one or more bent portions in the middle of the height direction, both of which are front surfaces of the heat sink. FIG. Similarly to FIG. 14, these heat sinks are also fixed to the member 3 with the adhesive layer 4 interposed between the heat receiving portion 1 and the heat generating source side member 3.
In the embodiment of FIG. 15A, both end portions d in the longitudinal direction of the paper sheet are bent and formed vertically (at right angles), and the leading end portion 9 of the paper sheet portion d is changed to the paper sheet portion. The portion 9 is bent at a right angle in the horizontal direction, and a portion 90 on the tip side of the portion 9 is bent downward at a right angle. That is, the paper sheet portion d of this embodiment has two (two steps) bent portions 10x and 10y (both are right-angle bent portions) in the middle of the height direction.

In the embodiment shown in FIG. 15 (a), both end portions d in the longitudinal direction of the paper sheet are bent and formed vertically (at a right angle), and the leading end portion 9 of the paper sheet portion d is formed as a paper sheet portion. B is bent at a right angle in the horizontal direction on the e side, and a portion 90 on the leading end side of the portion 9 is raised vertically, and a portion 900 on the leading end side of the portion 90 is further perpendicular to the horizontal direction on the anti-paper sheet portion e side. It is a bent one. That is, the paper sheet portion d of this embodiment has three (three steps) bent portions 10x, 10y, and 10z (all of which are right-angle bent portions) in the middle of the height direction.
The paper sheet portions d, 9, 90, and 900 may be bent in one direction, and therefore may be inclined instead of vertical or perpendicular.

The heat sinks of FIGS. 12 to 14 have a larger surface area and higher heat dissipation characteristics than the heat sinks of FIGS. 9 to 11 in the same envelope volume (envelope volume: heat sink height × width × depth). Furthermore, the heat sinks of FIGS. 15A and 15A have a larger surface area of the heat radiation part 2 than the heat sinks of FIGS. 12 to 14 in the same envelope volume (envelope volume: heat sink height × width × depth). High heat dissipation characteristics.
The heat sinks shown in FIGS. 12 to 14 and the heat sinks shown in FIGS. 15A and 15A are heat sinks that have particularly excellent heat dissipation characteristics during vertical mounting, and electrical devices that have a fixed heat sink mounting (installation) direction (for example, , TV, refrigerator, air conditioner, LED downlight).

16 to 18 show another embodiment of the heat sink of the present invention. FIG. 16 is a plan view, FIG. 17 is a front view, and FIG. 18 is a state where the heat sink is attached to a member (for example, a semiconductor element) on the heat source side. It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
In the heat sink of this embodiment, a paper sheet portion f on each side of a rectangular paper sheet is bent and formed vertically (right angle), and a flat paper sheet portion g on the center side receives heat. The paper sheet portion f constitutes the heat radiating portion 2 (heat radiating fin 20). As shown in FIG. 18, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side, and the heat sink is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.
Notches 11 are provided at the four corners of the paper sheet in order to bend and form each paper sheet portion f.

The paper sheet may have a polygonal shape, and may be raised by bending and forming at least three paper sheet portions f of the paper sheet. Further, the paper sheet portion f may be raised in one direction (upward), and thus may be inclined instead of vertical (right angle).
In such a heat sink, the entire bottom portion of the heat sink becomes the heat receiving portion 1 without folding the paper sheet portion like the heat sinks of FIGS. 5 to 7 and the heat sinks of FIGS. Heat can be received from the entire surface of the member 3.
Also, since the paper sheet portion f on at least three sides of the polygonal paper sheet is bent and raised in one direction, the heat sink has particularly excellent heat dissipation characteristics when mounted horizontally. (Installation) It is an electrical device with a fixed direction, and is suitable for a device in which a heat sink is mounted horizontally.

19 to 21 show another embodiment of the heat sink of the present invention. FIG. 19 is a plan view, FIG. 20 is a front view, and FIG. 21 is a state where the heat sink is attached to a member (for example, a semiconductor element) on the heat source side. It is a front view (however, it shows in the state which carried out the longitudinal cross-section of the member 3 by the side of a heat source).
In the heat sink of this embodiment, a plurality of slit grooves 12 are provided in the paper sheet portion f of the embodiment of FIGS. 16 to 18 at intervals along the longitudinal direction. As shown in FIG. 21, the heat receiving portion 1 is in surface contact with the member 3 on the heat source side, and the heat sink is fixed to the member 3 with an adhesive layer 4 interposed in the surface contact portion.
By providing the plurality of slit grooves 12 in the paper sheet portion f as described above, it is possible to reduce the difference in heat radiation characteristics between the vertical mounting and the horizontal mounting, as compared with the heat sinks of FIGS. For this reason, it is suitable for electrical equipment where the mounting (installation) direction of the heat sink is not fixed (for example, game consoles and desktop PCs that can be used vertically or horizontally, LED spotlights that can change the lighting direction, etc.) Yes.

22 to 24 show another embodiment of the heat sink of the present invention. FIG. 22 is a front view showing a state where the heat sink is attached to a tubular or columnar member, and FIG. 23 is a plan view. FIG. 24 is a front view showing a molded body obtained by bending a paper sheet into a corrugated plate shape before being bent into a cylindrical shape as shown in FIG.
The heat sink of this embodiment is formed by bending a paper sheet into a corrugated plate shape having flat corrugated bottoms, and bending the formed body A into a tubular shape so that the bottom of the corrugation is inside the cylinder. The paper sheet portion a1 at the bottom of the valley constitutes the heat receiving portion 1, and the other paper sheet portion b1 rising from the heat receiving portion 1 constitutes the heat radiating portion 2 (heat radiating fin 20). This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.

The corrugated shape of the molded body A is a portal-shaped (quadrangle) cross section like the embodiment of FIGS. In addition, the molded object A may be a corrugated sheet shape like embodiment of Fig.4 (a)-(d).
When the heat sink is attached to the tubular or columnar member 3 on the heat source side, the molded body A may be bent into a tubular shape to complete the heat sink, and then attached to the tubular or columnar member 3. However, for example, in a state where an adhesive layer is formed on the surface of the paper sheet portion a1 of the molded body A or an adhesive layer is formed on the outer peripheral surface of the tubular or columnar member 3, the molded body A is tubular or columnar. The tubular heat sink may be completed and attached to the tubular or columnar member 3 at the same time. When the molded body A is folded into a cylindrical shape to complete the heat sink as in the former case, both ends of the molded body A molded into a cylindrical shape are joined with an adhesive or the like to form a cylindrical heat sink. .
The heat sink can efficiently dissipate heat when the heat source side member is tubular or cylindrical. Examples of the tubular or columnar member on the heat source side include a pipe portion of a water-cooled heat sink, a columnar heater, a columnar LED lighting apparatus, a projector light source, and the like.

FIGS. 25 to 27 show another embodiment of the heat sink of the present invention. FIG. 25 is a front view showing the heat sink attached to a tubular or columnar member, and FIG. 26 is a plan view. FIG. 27 is a front view showing a molded body obtained by bending a paper sheet into a corrugated plate shape before being bent into a cylindrical shape as shown in FIG.
The heat sink of this embodiment is formed by bending a portion on one end side in the longitudinal direction of the paper sheet into a corrugated plate shape in which each corrugated valley bottom is flat and bending a portion c1 on the other end side in the longitudinal direction of the paper sheet. Then, the sheet A is brought into close contact with the bottom of the corrugated plate by folding it back to the corrugated plate side, and the formed body A is formed into a tubular shape so that the paper sheet portion c1 is inside the tube. c1 and the paper sheet portion a1 at the bottom of the valley constitute the heat receiving portion 1, and the other paper sheet portion b1 rising from the heat receiving portion 1 constitutes the heat radiating portion 2 (heat radiating fin 20). This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.

In this heat sink, the paper sheet portion c1 is folded back to the corrugated valley side and overlapped with the paper sheet portion a1, so that the entire bottom of the heat sink becomes the heat receiving portion 1 and can receive heat from the entire surface of the member 3 on the heat source side. Therefore, the heat dissipation characteristics are improved accordingly.
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.
The corrugated plate shape of the molded body A is a gate shape (quadrangle) in cross section, similar to the embodiment of FIGS. Note that the molded body A may have a corrugated shape as in the embodiment of FIGS.

When the heat sink is attached to the tubular or columnar member 3 on the heat source side, the molded body A may be bent into a tubular shape to complete the heat sink, and then attached to the tubular or columnar member 3. However, for example, in a state where an adhesive layer is formed on the surface of the paper sheet portion c1 of the molded body A or an adhesive layer is formed on the outer peripheral surface of the tubular or columnar member 3, the molded body A is tubular or columnar. The tubular heat sink may be completed and attached to the tubular or columnar member 3 at the same time. When the molded body A is folded into a cylindrical shape to complete the heat sink as in the former case, both ends of the molded body A molded into a cylindrical shape are joined with an adhesive or the like to form a cylindrical heat sink. .
The heat sink can efficiently dissipate heat when the heat source side member is tubular or cylindrical. Examples of the tubular or columnar member on the heat source side include a pipe portion of a water-cooled heat sink, a columnar heater, a columnar LED lighting apparatus, a projector light source, and the like.

28 to 31 show another embodiment of the heat sink of the present invention. FIG. 28 is a front view showing a state where the heat sink is attached to a tubular or columnar member, FIG. 29 is a plan view, and FIG. Is a longitudinal sectional view. FIG. 31 is a front view showing a paper sheet before slitting and being bent into a cylindrical shape as shown in FIG.
In the heat sink of this embodiment, a plurality of slits 13 are provided in a portion h on one end side in the paper sheet width direction at intervals along the longitudinal direction, and the paper sheet portion h is bent and formed vertically (at a right angle). ) (The bent sheet is formed along the broken line in FIG. 31), and the paper sheet portion i in which the slit 13 is not provided in the formed body B is placed in the cylinder outer direction. The paper sheet portion i constitutes the heat receiving portion 1 and the paper sheet portion h constitutes the heat radiating portion 2 (heat radiating fins 20). This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.
Note that the paper sheet portion h may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle).
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.

  When the heat sink is attached to the tubular or columnar member 3 on the heat source side, the molded body B may be bent into a cylindrical shape to complete the heat sink, and then attached to the tubular or columnar member 3. However, for example, in a state where an adhesive layer is formed on the surface of the paper sheet portion i of the molded body B or an adhesive layer is formed on the outer peripheral surface of the tubular or columnar member 3, the molded body B is tubular or columnar. The tubular heat sink may be completed and attached to the tubular or columnar member 3 at the same time. When the molded body B is bent into a cylindrical shape to complete a heat sink as in the former case, both ends of the molded body B molded into a cylindrical shape are joined with an adhesive or the like to form a cylindrical heat sink. .

  The heat sink can efficiently dissipate heat when the heat source side member is tubular or cylindrical. Further, compared to the heat sinks of FIGS. 22 to 24 and the heat sinks of FIGS. 25 to 27, the difference in heat radiation characteristics between the vertical mounting and the horizontal mounting can be reduced. Examples of the tubular or columnar member on the heat source side include a pipe portion of a water-cooled heat sink, a columnar heater, a columnar LED lighting apparatus, a projector light source, and the like.

32 to 35 show another embodiment of the heat sink of the present invention. FIG. 32 is a front view showing the heat sink attached to a tubular or columnar member, FIG. 33 is a plan view, and FIG. Is a longitudinal sectional view. FIG. 35 is a front view showing a paper sheet provided with slits and before being bent into a cylindrical shape as shown in FIG.
The heat sink of this embodiment is provided with a plurality of slits 13 at intervals along the longitudinal direction of the portions h _x , h _y at both ends in the paper sheet width direction, and the both paper sheet portions h _x , h _y is bent and raised at a right angle (folded along the broken line in FIG. 35), and the central paper sheet portion i in which the slit 13 is not provided in the molded body B is raised and molded. The paper sheet portions h _x and h _y are bent and formed in a cylindrical shape so as to face the outside of the cylinder, the paper sheet portion i constitutes the heat receiving portion 1, and the paper sheet portions h _x and h _y radiate heat. Part 2 (radiating fin 20) is configured. This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.

The paper sheet portions h _x and h _y may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle).
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.
Other configurations, manufacturing methods, mounting methods to the member 3, suitable usage patterns, and the like are the same as those in the embodiment of FIGS.

36 to 39 show another embodiment of the heat sink of the present invention. FIG. 36 is a front view showing the heat sink attached to a tubular or columnar member, FIG. 37 is a plan view, and FIG. Is a longitudinal sectional view. FIG. 39 is a front view showing a paper sheet that is provided with slits and is not formed into a spiral shape as shown in FIG.
In the heat sink of this embodiment, a plurality of slits 14 are provided in a portion h1 on one end side in the paper sheet width direction at intervals along the longitudinal direction, and the paper sheet portion h1 is bent and formed vertically (at a right angle). ) (The paper sheet portion i1 in which the slit is not provided is formed in the formed body C, and the paper sheet portion h1 which has been formed is formed in the spiral outer direction. The paper sheet portion i1 constitutes the heat receiving portion 1 and the paper sheet portion h1 constitutes the heat radiating portion 2 (heat radiating fins 20). This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.
The paper sheet portion h1 may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle).
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.

  When this heat sink is attached to the tubular or columnar member 3 on the heat source side, the molded body C may be folded into a spiral shape to complete the heat sink, and then attached to the tubular or columnar member 3. However, for example, in a state where an adhesive layer is formed on the surface of the paper sheet portion i1 of the molded body C or an adhesive layer is formed on the outer peripheral surface of the tubular or columnar member 3, the molded body C is tubular or columnar. The member 3 may be attached to the tubular or columnar member 3 at the same time as the spiral heat sink is completed. When the molded body C is formed into a heat sink by bending the molded body C in a spiral manner as in the former case, a part of the molded body C wound in a spiral is overlapped on the upper and lower sides, and the polymerized portion is bonded with an adhesive. You may make it adhere | attach.

  The heat sink can efficiently dissipate heat when the heat source side member is tubular or cylindrical. Further, compared to the heat sinks of FIGS. 22 to 24 and the heat sinks of FIGS. 25 to 27, the difference in heat radiation characteristics between the vertical mounting and the horizontal mounting can be reduced. Moreover, since the length wound helically can be adjusted freely, even when the tubular or cylindrical member to be attached is long and a plurality of the heat sinks shown in FIGS. Can respond. Examples of the tubular or columnar member on the heat source side include a pipe portion of a water-cooled heat sink, a columnar heater, a columnar LED lighting apparatus, a projector light source, and the like.

40 to 43 show another embodiment of the heat sink of the present invention. FIG. 40 is a front view showing the heat sink attached to a tubular or columnar member, FIG. 41 is a plan view, and FIG. Is a longitudinal sectional view. FIG. 43 is a front view showing a paper sheet that is provided with a slit and is not bent into a spiral shape as shown in FIG.
The heat sink of this embodiment is provided with a plurality of slits 14 at intervals along the longitudinal direction in the portions h1 _x and h1 _y on both ends in the paper sheet width direction, and the paper sheet portions h1 _x and h1. _Y is bent and formed vertically (at a right angle) (bent along the broken line in FIG. 43), and the paper sheet portion i1 in which no slit is provided in the formed body C is raised and formed. The paper sheet portions h1 _x and h1 _y are formed in a spiral shape so as to face the outer side of the spiral body, the paper sheet portion i1 constitutes the heat receiving portion 1, and the paper sheet portions h1 _x and h1 _y dissipate heat. Part 2 (radiating fin 20) is configured. This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member 3 with an adhesive layer (not shown) interposed in the surface contact portion.

The paper sheet portions h1 _x and h1 _y may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle).
A heat sink having such a shape and structure is not easy to manufacture from a metal material, but can be easily manufactured from a paper sheet.
Other configurations, manufacturing methods, mounting methods to the members 3, suitable usage patterns, and the like are the same as those in the embodiment of FIGS.

44 to 48 show another embodiment of the heat sink of the present invention. FIG. 44 is a plan view, FIG. 45 is a front view, FIG. 46 is a side view, and FIG. FIG. 48 is a plan view showing a paper sheet that is provided with a cut portion and the cut portion is bent and formed as shown in FIG.
The heat sink of this embodiment is obtained by cutting a plurality of portions of a paper sheet, bending the cut processed portion 15 and raising it vertically (right angle) (bending along the broken line in FIG. 48). The paper sheet portion j formed by raising and forming the notching portion 15 constitutes the heat radiating portion 2 (heat radiating fin 20), and the other flat paper sheet portion k constitutes the heat receiving portion 1. In this heat sink, the heat receiving portion 1 comes into surface contact with a member (not shown) on the heat source side, and is fixed to the member with an adhesive layer (not shown) interposed in the surface contact portion.

Although the method of providing the notching portion 15 is arbitrary, in the present embodiment, in order to form a plurality of wide radiating fins 20 in parallel, as shown in FIG. A plurality of parts 15 are provided in parallel. The radiating fins 20 can be formed by bending the respective notched portions 15 at the positions indicated by broken lines in FIG. 48 and raising them vertically (at right angles).
Note that the paper sheet portion j may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle). Further, the shape of the cut portion 15 is arbitrary, such as a semicircular shape or a triangular shape, in addition to the portal shape.

Since this heat sink does not have a ceiling portion that hinders convection in the radiating fins 20, it is possible to reduce the difference in heat radiation characteristics between vertical mounting and horizontal mounting. Therefore, this heat sink is an electric device in which the mounting direction of the heat sink is not fixed (for example, a game machine or a desktop personal computer that can be used vertically or horizontally, an LED spotlight that can change the lighting direction, etc.) Suitable for
Moreover, since this heat sink can be manufactured simply by bending the notched portion 15 and raising it vertically (at right angles), there is an advantage that it can be manufactured with relatively simple equipment.

49 to 53 show another embodiment in which the shape of the cutting portion 15 is different. FIG. 49 is a plan view, FIG. 50 is a front view, FIG. 51 is a side view, and FIG. . FIG. 53 is a plan view showing a paper sheet that is provided with a cut portion and that is not bent and formed as shown in FIG.
In this embodiment, in order to form a large number of radiating fins 20 having a small width, as shown in FIG. 53, a large number of narrow-cut-shaped cutting portions 15 are provided vertically and horizontally. The radiating fins 20 can be formed by bending the respective notched portions 15 at the positions indicated by broken lines in FIG. 53 and raising them vertically (at right angles).
This heat sink is suitable for electrical equipment where the mounting (installation) direction of the heat sink is not fixed (for example, game consoles and desktop PCs that can be used vertically or horizontally, LED spotlights that can change the lighting direction, etc.) However, compared with the heat sinks of FIGS. 44 to 48, the heat dissipation characteristics in the mounting direction rotated 90 degrees are superior.

54 and 55 show another embodiment of the heat sink of the present invention. FIG. 54 is a plan view and FIG. 55 is a longitudinal sectional view.
In the heat sink of this embodiment, a plurality of portions on one end side in the longitudinal direction of the paper sheet are cut, and the cut portion 15 is bent and formed vertically (at a right angle), and the other end in the longitudinal direction of the paper sheet. The side portion l is bent and folded back to the side opposite to the start-up side of the cut portion 15 so as to be brought into close contact with the flat paper sheet portion k of the one end portion in the paper sheet longitudinal direction. The paper sheet portion j formed by raising and forming the notching portion 15 constitutes the heat radiating portion 2 (heat radiating fin 20), and the paper sheet portion l and the paper sheet portion k constitute the heat receiving portion 1. Yes. In this heat sink, the heat receiving portion 1 comes into surface contact with a member (not shown) on the heat source side, and is fixed to the member with an adhesive layer (not shown) interposed in the surface contact portion.

Although the method of providing the notching portion 15 is arbitrary, in this embodiment, in order to form a plurality of wide radiating fins 20 in parallel, a wide gate-shaped notching portion is formed as in FIG. A plurality of 15 are provided in parallel. The radiating fins 20 can be formed by bending each of the cut portions 15 at a position indicated by a broken line in FIG.
Note that the paper sheet portion j may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle). Further, the shape of the cut portion 15 is arbitrary, such as a semicircular shape or a triangular shape, in addition to the portal shape.

In this heat sink, the paper sheet portion l is folded and overlapped with the paper sheet portion k, so that the entire bottom portion of the heat sink becomes the heat receiving portion 1 and can receive heat from the entire surface of the member on the heat source side. Will improve.
Moreover, since this heat sink does not have the ceiling part which becomes a hindrance to a convection in the radiation fin 20, the thermal radiation characteristic difference at the time of vertical mounting and horizontal mounting can be made small. Therefore, this heat sink is an electric device in which the mounting direction of the heat sink is not fixed (for example, a game machine or a desktop personal computer that can be used vertically or horizontally, an LED spotlight that can change the lighting direction, etc.) Suitable for

56 and 57 show another embodiment in which the shape of the cutting portion 15 is different. FIG. 56 is a plan view and FIG. 57 is a longitudinal sectional view.
In this embodiment, in order to form a large number of radiating fins 20 having a small width, as in FIG. 53, a large number of narrow and narrow cut-out processed portions 15 are provided vertically and horizontally. The radiating fins 20 can be formed by bending each of the notched portions 15 at a position indicated by a broken line in FIG.
This heat sink is suitable for electrical equipment where the mounting (installation) direction of the heat sink is not fixed (for example, game consoles and desktop PCs that can be used vertically or horizontally, LED spotlights that can change the lighting direction, etc.) However, compared with the heat sinks of FIGS. 54 and 55, the heat dissipation characteristics in the mounting direction rotated 90 degrees are superior.

58 and 59 show another embodiment of the heat sink of the present invention. FIG. 58 is a front view showing a state where it is attached to a tubular or columnar member on the heat source side, and FIG. 59 is a plan view.
In the heat sink of this embodiment, a plurality of portions of the paper sheet are cut, the cut portion 15 is bent and formed vertically (right angle), and the molded body D (molded body corresponding to FIG. 44) is formed. A flat paper sheet portion k1 is formed by bending a paper sheet portion j1 formed by raising and forming the notching portion 15 so that the paper sheet portion j1 faces the outside of the tube, and the paper sheet portion j1 is formed by the heat radiating portion 2 ( A heat radiating fin 20) is formed, and the paper sheet portion k1 forms the heat receiving portion 1. This heat sink has its heat receiving portion 1 in surface contact with the tubular or columnar member 3 on the heat source side, and is fixed to the member with an adhesive layer (not shown) interposed in the surface contact portion.

Although the method of providing the notching portion 15 is arbitrary, in this embodiment, in order to form a plurality of wide radiating fins 20 in parallel, a wide gate-shaped notching portion is formed as in FIG. A plurality of 15 are provided in parallel. The radiating fins 20 can be formed by bending the respective notched portions 15 at the positions indicated by broken lines in FIG. 48 and raising them vertically (at right angles).
Note that the paper sheet portion j1 may be raised in one direction (upward), and therefore may be inclined instead of vertical (right angle). Further, the shape of the cut portion 15 is arbitrary, such as a semicircular shape or a triangular shape, in addition to the portal shape.

  When the heat sink is attached to the tubular or columnar member 3 on the heat source side, the molded body D may be bent into a tubular shape to complete the heat sink, and then attached to the tubular or columnar member 3. For example, a state where an adhesive layer is formed on the surface of the paper sheet portion k1 of the molded body D (molded body corresponding to FIG. 44), or a state where an adhesive layer is formed on the outer peripheral surface of the tubular or columnar member 3 Thus, by winding the molded body D around the tubular or columnar member 3, the tubular heat sink may be completed and attached to the tubular or columnar member 3 at the same time. In the case of forming the heat sink by bending the molded body D into a cylindrical shape as in the former case, both ends of the molded body D molded into a cylindrical shape are joined with an adhesive or the like to form a cylindrical heat sink. .

60 and 61 show another embodiment in which the shape of the cutting portion 15 is different. FIG. 60 is a plan view and FIG. 61 is a longitudinal sectional view.
In this embodiment, in order to form a large number of radiating fins 20 having a small width, as in FIG. 53, a large number of narrow and narrow cut-out processed portions 15 are provided vertically and horizontally. The radiating fins 20 can be formed by bending each of the notched portions 15 at a position indicated by a broken line in FIG.
The heat sinks of FIGS. 58 and 59 and the heat sinks of FIGS. 60 and 61 can efficiently dissipate heat when the member on the heat source side is tubular or cylindrical. Examples of the tubular or columnar member on the heat source side include a pipe portion of a water-cooled heat sink, a columnar heater, a columnar LED lighting apparatus, a projector light source, and the like.

The heat sink 2 of the heat sink of the present invention can have a housing connecting portion that is fixed in a state of being in surface contact with the housing as a part thereof. 62 (a), (b) and FIGS. 63 (a)-(c) show some embodiments thereof. Each figure is a front view of the heat sink.
The heat sink of the embodiment of FIG. 62 (a) is formed by bending a paper sheet into a U-shaped cross section, and a paper sheet portion m corresponding to the lower side of the U-shape constitutes the heat receiving portion 1, and other paper. The sheet | seat part n comprises the thermal radiation part 2 (radiation fin 20). This heat sink is fixed to the member 3 with an adhesive layer 4 interposed between the heat receiving part 1 and the member 3 (semiconductor or the like) on the heat source side. Reference numeral 60 denotes a substrate that supports the member 3. A paper sheet portion corresponding to the upper side of the U shape in the heat radiating portion 2 constitutes the housing connecting portion 16 and is connected (fixed) to the housing 50. Usually, this connection (adhesion) is made by interposing an adhesive layer.
Further, the heat sink of the embodiment of FIG. 62 (a) is provided with a buffer bent portion 200 that absorbs vibration shock in the U-shaped intermediate sheet sheet portion n (radiation fin 20). Other configurations are the same as those of the heat sink in FIG.

Further, the heat sink of the embodiment of FIG. 63 (a) is one in which a paper sheet portion o is continuously provided as a part of the heat radiating portion 2 (radiating fin 20) at the end of the heat sink of FIG. 4 (d). Yes, the leading end side of the paper sheet portion o constitutes the housing connecting portion 16 and is connected (fixed) to the housing 50. Usually, this connection (adhesion) is made by interposing an adhesive layer.
Further, the heat sink of the embodiment of FIGS. 63A and 63C is provided with a buffer bending portion 200 that absorbs vibration shock in the middle of the paper sheet portion o (radiation fin 20). Other configurations are the same as those of the heat sink of FIG.
As described above, the heat of the member 3 on the heat source side can be dissipated through the casing 50 by connecting a part of the heat radiating section 2 (the casing connecting section 16) to the casing 50. The vibration shock from the housing side can be absorbed by the heat sink.

Hereinafter, the advantages of the heat sink of the present invention over the metal heat sink will be described with reference to FIGS. 64 (a), (b) and FIG.
When a plurality of semiconductor elements (for example, a plurality of flat package type semiconductor elements mounted on a substrate) are radiated by one heat sink, there is a variation in height between the semiconductor elements. Therefore, when a metal heat sink is used. As shown in FIG. 64A, it is necessary to use a heat conductive sheet 70 to absorb the step between the semiconductor elements 30a and 30b. On the other hand, a paper heat sink has a low plastic deformation stress and high flexibility. Therefore, as shown in FIG. 64 (a), the step between the semiconductor elements 30a and 30b is easily absorbed by the deformation of the heat sink itself. can do.

  In addition, when the surface of the heat source that contacts the heat sink is non-planar (a curved surface or a surface with irregular slopes, irregularities, etc.), in the case of a metal heat sink, the shape of the heat receiving part is matched to the surface shape of the member. In addition, it is necessary to secure the adhesion between the member surface and the heat sink by interposing a heat conductive sheet in order to absorb variations due to tolerances or by post-processing the heat sink side. On the other hand, since the paper heat sink has low plastic deformation stress and high flexibility, it can be in close contact with the surface of the member 3 by deformation of the heat sink itself as shown in FIG. Can be absorbed.

a, a1, b, b1, c, c1, d, e, f, g, h, h x, h y, h1, h1 x, h1 y, i, i1, j, j1, k, k1, l, m, n, o Paper sheet part 1 Heat receiving part 2 Heat radiating part 3 Member 4 Adhesive layer 5,6 Corner part 7 Ceiling part 8,9 Paper sheet part 10, 10x, 10y, 10z Bending part 11 Notch 12 Slit groove 13 , 14 Slit 15 Incision processing part 16 Case connection part 20 Radiation fin 50 Case 90 Paper sheet part 200 Bending part 900 Paper sheet part A, B, C, D Molded body

Claims (16)

One sheet of paper to which powder or / and fibers for imparting thermal conductivity are added to the sheet is (i) bent (including the case where it is bent into a curved shape), (ii) notched And a heat sink made into a three-dimensional shape by one or more molding methods of the bending processing of the cut portion (including the case of bending into a curved surface),
A heat sink, wherein a part of the paper sheet constitutes a heat receiving part (1) in surface contact with a member on the heat source side, and the other part constitutes a heat radiating part (2). It is a heat sink that is formed by bending a paper sheet into a corrugated plate shape where each corrugated valley bottom is flat,
The heat sink according to claim 1, wherein the paper sheet portion (a) at the bottom of the valley constitutes a heat receiving portion (1), and the other paper sheet portion (b) constitutes a heat radiating portion (2). The portion on one end side in the longitudinal direction of the paper sheet is bent and formed into a corrugated shape with flat corrugated bottoms, and the portion (c) on the other end side in the longitudinal direction of the paper sheet is folded and formed. It is a heat sink closely attached to the bottom of the valley by folding back to the valley side,
The paper sheet part (c) and the paper sheet part (a) at the bottom of the valley constitute a heat receiving part (1), and the other paper sheet part (b) constitutes a heat radiating part (2). The heat sink according to claim 1.   The heat sink according to claim 2 or 3, wherein a pair of opposed paper sheet portions constituting each crest portion of the corrugated plate are in close contact with each other. The heat sink is a heat sink that is formed by bending a part (d) on both ends in the longitudinal direction of the paper sheet and bending it up in one direction.
The heat sink according to claim 1, wherein a flat paper sheet part (e) on the center side constitutes a heat receiving part (1), and the paper sheet part (d) constitutes a heat radiating part (2).   The heat sink according to claim 5, wherein the paper sheet portion (d) has one or more bent portions in the middle of the height direction. A heat sink that is formed by bending a paper sheet portion (f) on at least three sides of a polygonal paper sheet and bending it up in one direction,
The heat sink according to claim 1, wherein a flat paper sheet part (g) on the center side constitutes a heat receiving part (1), and the paper sheet part (f) constitutes a heat radiating part (2).   The heat sink according to claim 7, wherein a plurality of slit grooves are provided at intervals along the longitudinal direction of the paper sheet portion (f). A paper sheet is a heat sink in which each corrugated valley bottom is bent into a flat corrugated shape, and the molded body is bent into a cylindrical shape so that the valley bottom is inside the cylinder,
The heat sink according to claim 1, wherein the paper sheet portion (a1) at the bottom of the valley constitutes a heat receiving portion (1), and the other paper sheet portion (b1) constitutes a heat radiating portion (2). One end of the paper sheet in the longitudinal direction is bent into a corrugated shape with flat corrugated bottoms, and the other end (c1) in the longitudinal direction of the paper sheet is folded into a corrugated sheet. It is a heat sink that is brought into close contact with the bottom of the valley by folding back to the valley side, and the molded body is bent into a cylindrical shape so that the paper sheet portion (c1) is inside the cylinder,
The paper sheet portion (c1) and the paper sheet portion (a1) at the bottom of the valley constitute a heat receiving portion (1), and the other paper sheet portion (b1) constitutes a heat radiating portion (2). The heat sink according to claim 1. A portion (h) on one or both ends in the paper sheet width direction is provided with a plurality of slits spaced along the longitudinal direction, and the paper sheet portion (h) is bent and formed in one direction. A heat sink formed by bending and forming a paper sheet portion (i) of the molded body, which is not provided with a slit, into a tubular shape so that the paper sheet portion (h) which has been raised and formed faces the outside of the tube ,
The heat sink according to claim 1, wherein the paper sheet part (i) constitutes a heat receiving part (1), and the paper sheet part (h) constitutes a heat radiating part (2). A part of the paper sheet width direction (h1) is provided with a plurality of slits at intervals along the longitudinal direction, and the paper sheet part (h1) is bent and formed in one direction. A heat sink formed by bending and forming a paper sheet portion (i1) without slits in the molded body into a spiral shape so that the paper sheet portion (h1) that has been raised and formed faces the outer side of the spiral body ,
The heat sink according to claim 1, wherein the paper sheet portion (i1) constitutes a heat receiving portion (1), and the paper sheet portion (h1) constitutes a heat radiating portion (2). It is a heat sink that cuts a plurality of locations on a paper sheet, folds and cuts the cut portion, and starts up in one direction.
The paper sheet portion (j) formed by raising and forming the cut portion constitutes a heat radiating portion (2), and the other flat paper sheet portion (k) constitutes a heat receiving portion (1). Item 2. The heat sink according to Item 1. Cut and cut multiple locations on one end of the paper sheet in the longitudinal direction, fold and cut the notched portion in one direction, and fold and form the other end (l) in the longitudinal direction of the paper sheet. Then, by folding back to the opposite side of the notch forming side of the cut-in processing portion, a heat sink closely attached to the flat paper sheet portion (k) of the one end side portion in the paper sheet longitudinal direction,
The paper sheet part (j) formed by raising and forming the notching part constitutes a heat radiating part (2), and the paper sheet part (l) and the paper sheet part (k) constitute a heat receiving part (1). The heat sink according to claim 1. A paper obtained by cutting a plurality of portions of a paper sheet, bending and cutting the cut processed portion in one direction, and forming a flat paper sheet portion (k1) of the formed body by raising the cut processed portion. It is a heat sink that is bent into a cylindrical shape so that the sheet part (j1) faces the outside of the cylinder,
The heat sink according to claim 1, wherein the paper sheet portion (j1) constitutes a heat radiating portion (2), and the paper sheet portion (k1) constitutes a heat receiving portion (1).   2. The heat sink according to claim 1, further comprising a housing connecting portion fixed in a state of surface contact with the housing as a part of the heat radiating portion.

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