JP2014154822A - Radiation fin for heat sink and heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation fin for a heat sink using carbon fiber having light-weight and sufficient strength.SOLUTION: A radiation fin 1 for a heat sink is connected to a base substance of the heat sink and comprises a body consisting of carbon fiber. The body comprises: a shape holding part 3 where a part of the carbon fiber is reinforced by resin in order to maintain a shape of the body; and a heat radiation part 2 where the carbon fiber on a surface thereof is exposed without being covered with the resin.

Description

  The present invention relates to a heat sink fin for a heat sink using carbon fiber as a material, and a heat sink provided with the same.

  2. Description of the Related Art Conventionally, a heat sink provided with heat radiation fins made of a metal having high thermal conductivity has been used in order to achieve suitable heat radiation. However, in recent years, with the development of various materials, materials other than metals having high thermal conductivity, such as pitch-based carbon fibers disclosed in Patent Document 1, have become available.

  Patent Document 2 proposes a heat sink in which heat dissipating fins are made of carbon fiber reinforced resin (CFRP) in order to reduce weight.

Japanese Patent Laid-Open No. 04-163319 JP 2001-217359 A

  However, since the pitch-based carbon fiber as shown in Patent Document 1 does not have sufficient strength, it is not preferable that the fin for a heat sink that requires strength is composed only of the pitch-based carbon fiber. Moreover, since the radiation fin shown by patent document 2 is filled with resin between the several carbon fibers contained in a radiation fin, heat radiation from the outer periphery of carbon fiber is prevented by resin, and sufficient heat dissipation performance Cannot be realized.

  In view of the above circumstances, an object of the present invention is to realize a heat dissipating fin for a carbon fiber heat sink having both good heat dissipation performance and necessary strength, and a heat sink including the same.

  In order to solve the above problems, a heat sink fin for a heat sink according to the present invention is a heat sink fin for a heat sink having a main body made of carbon fiber, which is connected to a base of the heat sink, In order to maintain the shape of the main body, a shape holding portion in which a part of the carbon fiber is reinforced with a resin, and a heat dissipation portion where the carbon fiber on the surface is exposed without being covered with the resin are provided. And

  The above-mentioned “holding the shape of the main body” means that the shape holding portion is held not only when the shape holding portion can hold the shape of the main body alone, but also at the portion where the main body is connected to the base body. Including the case where the shape of the main body can be held in cooperation with the device.

  In addition, “a part of the carbon fiber is reinforced with resin” means that a plurality of carbon fibers constituting the main body are partially reinforced with resin to form a so-called carbon fiber reinforced resin (Carbon Fiber Reinforced Plastic). Means. The shape holding part is obtained by reinforcing a part of carbon fibers constituting the main body with resin, and the number, shape, position, and the like may be arbitrarily configured as long as the shape of the main body can be held.

  The term “connected” means that the heat sink is fixed so that heat can be transferred from the base of the heat sink to the carbon fiber of the heat radiating fin. The radiating fin may be connected to the heat sink base by any method as long as it can be connected to the heat sink base to the carbon fiber of the radiating fin. In order to raise, it is preferable that the part which transmits the heat | fever of a base | substrate is contacting the carbon fiber of a radiation fin directly.

  The above-mentioned “main body made of carbon fiber” includes not only a case where the main body is made of only carbon fibers but also other materials as long as the main body can substantially maintain the heat radiation performance and weight reduction effect by the carbon fibers. This includes cases where

  In the heat dissipating fin according to the present invention, it is preferable that the shape holding portion is provided in a peripheral portion of the main body that is not connected to the base body.

  Furthermore, in the heat radiating fin according to the present invention, it is preferable that the shape holding portion is provided over the entire peripheral portion of the main body that is not connected to the base body.

  The shape retaining portion is provided across the carbon fiber of the main body so as to connect each of the carbon fibers of the main body, and the crossing of the shape retaining portion across the carbon fiber. In a cross section perpendicular to the direction in which it is to be done, it is preferable that only a part of the cross section is reinforced with the resin.

  The above-mentioned “in the cross section perpendicular to the crossing direction of the shape holding portion crossing the carbon fiber, only a part of the cross section is reinforced with the resin” means that the shape holding portion crossing the carbon fiber. It is not necessary that all the cross-sections of the above-mentioned sections are “a part of the cross-section is reinforced with the resin”. It only needs to be reinforced with resin.

  The heat sink which concerns on this invention is provided with the said radiation fin and the base | substrate which has a groove part, The said radiation fin is connected to the said groove part, It is characterized by the above-mentioned.

  According to the heat sink for a heat sink of the present invention and the heat sink provided with the heat sink, the heat sink for the heat sink having a main body made of carbon fiber connected to the base of the heat sink. In order to maintain the shape, by providing a shape holding portion in which a part of the carbon fiber is reinforced with resin, and a heat radiation portion where the carbon fiber on the surface is exposed without being covered with the resin, While holding the shape by the shape holding portion reinforced with resin, good heat dissipation performance can be realized by the heat dissipation portion where the carbon fibers on the surface are exposed.

Schematic configuration diagram of heat sink according to the present invention Schematic of the fin which concerns on the 1st Embodiment of this invention. Schematic of the fin which concerns on the 2nd Embodiment of this invention. Schematic of the fin which concerns on the 3rd Embodiment of this invention. Schematic of the fin which concerns on the 4th Embodiment of this invention. Schematic of the fin which concerns on the 5th Embodiment of this invention. Schematic of the fin which concerns on the 6th Embodiment of this invention.

  Embodiments of a heat sink fin for a heat sink according to the present invention and a heat sink provided with the heat sink fin will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a heat sink 10 including heat radiating fins according to the first embodiment of the present invention. FIG. 2 shows a front view (upper view of FIG. 2) and a bottom view (lower view of FIG. 2) of the heat radiation fin 1 for the heat sink according to the first embodiment of the present invention. 3 to 7, similarly to FIG. 2, a front view (upper view of each drawing) and a bottom view (lower view of each drawing) of the heat sink fin 1 for heat sinks according to the second to sixth embodiments are shown. Show. Moreover, the AA sectional view of the front view shown in the upper left of FIG. 3 is shown in the right view of FIG.

  As a device for heat dissipation, for example, there is a projector as shown in FIG. The apparatus 20 includes a substrate (not shown) on which a light source serving as a heat source is disposed, a reflector 22 attached so as to surround the substrate, a base 5 of the heat sink 10 provided so that the entire surface of the substrate is in close contact, An apparatus support portion 24 that rotatably supports the apparatus main body 23 via rotating shafts 27 provided on both side surfaces of the heat sink 10, and a handle 25 that rotates a tightening screw to fix the apparatus main body 23 in a predetermined posture. With. The apparatus 20 is fixed by rotating the handle 25 and pressing a tightening screw (not shown) against the side plate 6 after positioning the apparatus 20 in a suitable posture in accordance with a desired irradiation direction while rotating the apparatus 20 manually.

  The heat sink 10 of the apparatus 20 shown in FIG. 1 is erected in the Y direction in FIG. 1 from both the heat dissipating fins 1 to be described later, the aforementioned base 5 having a plurality of grooves 4 formed in parallel, and both ends of the base 5. In addition, two side plates 6 and three reinforcing members 7 (7A, 7B, and 7C) that are provided so as to be bridged between the side plates 6 and that support the end portions in the Y direction of the radiating fins 1 are provided. Each reinforcing member 7 has the same number of grooves as the number of the radiating fins 1. The plurality of heat dissipating fins 1 according to the first embodiment are respectively connected to the groove portions 4 by being fitted into the groove portions 4 of the base body 5 and fixed with an adhesive having high thermal conductivity. Similarly, the end of the fin 1 in the Y direction is fitted into the groove of the reinforcing member 7, and the fin 1 is supported by each reinforcing member 7 so as not to be bent. The reinforcing material 7A has a groove in the lower half in the figure, the reinforcing material 7B has a groove in the right half in the figure, and the reinforcing material 7C has a groove in the upper half in the figure. The heat radiating fins 1 are fitted to each other.

  In the present embodiment, the base 5 is made of aluminum. The radiating fin 1 has a length of 270 mm in the X direction, a length of 205 mm in the Y direction, and a length (thickness) of 1 mm in the Z direction. The base 5 has a length of 272 mm in the X direction and a length in the Y direction. The length (thickness) is 220 mm, and the length in the Z direction is 272 mm. The grooves are provided with a width of 1 mm, a depth of 3 mm, and an interval of 6 mm.

  In addition, it is not limited to the said embodiment, The said base | substrate 5 may be arrange | positioned by what kind of space | intervals by what kind of aspect, as long as the radiation fin 1 is spaced apart and installed. Moreover, if the heat sink 10 can exhibit its function as a whole, the base 5 can be configured in any shape to which the radiating fins 1 can be connected, and any material can be used as long as it has a high thermal conductivity. Can be configured. Similarly, the reinforcing members 7A, 7B, 7C, the side plates 6 and the like may be omitted, a new configuration may be added, or any configuration as long as the function of the heat sink 10 can be exhibited as a whole. can do.

  Further, the heat sink of the present embodiment is not limited to the present embodiment, and the heat sink of the present embodiment can be used with various types of devices 20 having various sizes as heat dissipation targets. You can connect by way.

  A heat radiation fin 1 according to the first embodiment shown in FIG. 2 is a heat radiation fin 1 for a heat sink including a main body 1A made of carbon fiber, which is connected to a base 5 of a heat sink 10, and the main body 1A is a main body. In order to maintain the shape of 1A, a shape holding portion 3 in which a part of the carbon fiber is reinforced with a resin and a heat radiation portion 2 in which the surface carbon fiber is exposed without being covered with the resin are provided. Moreover, the radiation fin 1 is formed in a rectangular thin plate shape, and one side of the rectangle (a portion below the broken line C in FIG. 2 in the Y direction) is fitted and connected to the groove portion 4 of the base 5 of the heat sink 10. Yes.

  The radiating fins 1 according to the second to sixth embodiments shown in FIGS. 3 to 7 are modifications of the radiating fin 1 according to the first embodiment, and the shapes of the radiating part 2 and the shape holding part 3 are the same. Only is different. For this reason, about the radiation fin 1 which concerns on 2nd thru | or 6th embodiment, a common part with the radiation fin 1 which concerns on 1st Embodiment is abbreviate | omitted and demonstrated. Moreover, the heat sink 10 according to FIG. 1 can include the heat radiation fins 1 according to the second to sixth embodiments instead of the heat radiation fins 1 according to the first embodiment.

  The heat dissipating part 2 may be composed of any material as long as it is a carbon fiber having good heat conductivity, for example, may be composed of a pitch-based carbon fiber using a pitch as a raw material as shown in Patent Document 1, It may be composed of PAN-based carbon fibers made from polyacrylonitrile (PAN), or may be composed of a combination of pitch-based and PAN-based carbon fibers. In the first to sixth embodiments, the heat dissipation portion 2 is made of pitch-based carbon fiber.

  In the heat dissipating part 2, the direction of the carbon fiber is preferably configured to be away from the part connected to the base 5. Since the heat dissipating fin 1 according to the first embodiment is connected to the base 5 and receives heat at a portion below the broken line C in the Y direction, the direction of the carbon fibers extends substantially in the Y direction shown in FIG. The heat can be suitably transmitted toward the direction away from the portion that receives the heat, and the heat can be suitably radiated. In addition, depending on the type of heat sink cooling object and the purpose of use, when it is desired to transfer heat to the heat radiating portion 2 in a plurality of directions, the direction of the carbon fiber is directed to each direction in which heat is to be transferred. You may form the thermal radiation part 2 combining arbitrarily.

  Moreover, the main body of the radiation fin 1 is not limited to a sheet shape, and may be configured in any shape and any size as long as the radiation portion 2 extends in a direction away from the portion connected to the base 5. For example, the main body of the heat radiating fin 1 may have a rod shape instead of a thin plate shape as long as the heat radiating portion 2 extends in a direction away from a portion that contacts the base 5.

  Further, the heat radiating portion 2 of the heat radiating fin 1 is fixed so that heat can be transferred from the base 5 of the heat sink 10 to the carbon fiber of the heat radiating fin 1. In this case, as long as heat can be transferred from the base 5 to the carbon fibers of the radiating fins 1, the heat radiating portion 2 may be fixed to the base 5 by any method, but the heat radiating performance is improved. Therefore, it is preferable that the portion that receives heat from the base 5 is in direct contact with the carbon fibers of the heat dissipation portion 2. In the first to sixth embodiments shown in FIGS. 2 to 7, heat conduction is performed with the exposed carbon fiber portion 2 </ b> A in direct contact with the substrate 5 among the connection portions that fit into the grooves 4 of the substrate 5. It is fixed with a highly adhesive. The heat dissipating part 2 may be configured in any number, any position, shape, and size as long as it can exhibit a heat dissipating function.

  The shape holding portion 3 may be reinforced with resin in an arbitrary shape within a range in which the shape of the main body 1A can be held, and may be configured in an arbitrary shape, an arbitrary position, and an arbitrary thickness. The above-mentioned “holding the shape of the main body 1 </ b> A” not only means that the shape holding portion 3 can hold the shape of the main body alone, but also the shape holding portion 3 is connected to the base body 5. In this case, the shape of the main body can be held in cooperation with being held by the groove portion. Further, the present invention is not limited to the above embodiment, and the shape retaining portion 3 may be any shape as long as it can retain the shape of the main body. For example, when the main body is rectangular, it is necessarily provided in the peripheral portion of the shape of the main body 1A. For example, the shape holding portion 3 may be provided in a diagonal line (X shape).

  In order to improve the heat dissipation performance, it is preferable to reduce the proportion of the shape holding portion 3 as much as possible with respect to the heat dissipation portion 2. Specifically, the surface area of the heat radiating portion 2 is increased as much as possible within a range in which the heat radiating fins 1 are sufficiently reinforced such that the heat radiating fins 1 are curved by their own weight and the adjacent radiating fins 1 do not contact each other. In addition, the ratio of the shape retaining portion 3 is reduced. More specifically, for example, it is preferable that the ratio of the heat radiation portion 2 and the shape retaining portion 3 is configured such that at least the heat radiation portion 2 occupies 50% or more of the heat radiation fin.

  In the radiating fin 1, it is preferable that the shape maintaining portion 3 is provided in a peripheral portion that is not connected to the base body 5 of the main body 1A. In this case, desired strength can be suitably realized while protecting the peripheral portion of the heat radiation portion 2 from damage or the like. Furthermore, it is preferable that the shape retaining portion 3 is provided over the entire peripheral portion not connected to the base body 5 of the main body 1A. The heat radiating fins 1 according to the first to sixth embodiments shown in FIGS. 2 to 7 are configuration examples in which the shape holding portion 3 is provided over the entire peripheral portion not connected to the base 5.

  In the radiating fin 1 shown in FIG. 1, the shape retaining portion 3 is connected to the base body 5 in the Y direction below the broken line C as described above, and the connecting portion connected to the base body 5 (the lower portion in the Y direction from the broken line C). The shape holding portion 3 is provided in a U-shape over the entire peripheral portion of the heat radiating fin 1 except for (). For this reason, by providing the shape retaining portion 3 in the peripheral portion and securing the sufficient shape retaining performance as described above, the ratio of the heat radiating portion 2 in the radiating fin 1 is maximized to obtain a high heat radiating performance. Can be realized.

  On the other hand, when the strength is required by the radiating fin 1, for example, as in the radiating fin 1 according to the second, third, fifth, and sixth embodiments shown in FIGS. By providing the shape retaining portion 3 around the entire periphery of the heat radiating portion 2 including the connected portion, higher shape retaining performance can be realized. Further, as shown in FIG. 3, when the shape holding portion 3 is provided so as to exclude the connection portion with the base body 5, the area of the carbon fiber portion 2 </ b> A that is in direct contact with the base body 5 can be sufficiently increased. Heat can be received efficiently, and the shape retention performance can be suitably realized.

  Further, in the heat dissipating fins 1 according to the fourth to sixth embodiments shown in FIGS. 5 to 7, the shape retaining portion 3 is connected to the frame-shaped portion 3 </ b> A that surrounds the peripheral portion and the frame-shaped portion 3 </ b> A. And an intermediate support portion 3B extending in a direction away from the connecting portion (Y direction in each figure). In this case, the center part of the heat radiation part 2 can be suitably held by the intermediate support part 3B while protecting the periphery of the heat radiation part 2 by the frame-shaped part 3A.

  Further, the heat dissipating fin 1 according to the fourth embodiment shown in FIG. 5 is connected to the frame-shaped portion 3A and the frame-shaped portion 3A, and extends in a direction away from the connection portion with the base 5 (Y direction in FIG. 5). Since the shape holding portion 3 is configured in an E shape with the intermediate support portion 3B, the carbon fiber is exposed even in the vicinity of the connection portion with the base body 5 while maintaining the shape of the main body preferably. Therefore, better heat dissipation performance can be achieved than when the shape holding portion 3 is provided over the entire vicinity of the connection portion with the base body 5.

  Further, the shape holding portion 3 may be further provided with an intermediate support portion 3B. For example, the shape holding portion 3 may be configured in a lattice shape.

  The radiating fin 1 of the sixth embodiment shown in FIG. 7 crosses the shape maintaining portion 3 with the frame-shaped portion 3A, the intermediate support portion 3B, the intermediate support portion 3B, and the frame-shaped portion 3A. It is set as the structure provided with the further intermediate | middle support part 3C provided in this. Since the intermediate support portion 3B and the further intermediate support portion 3C, which are stretched over the frame-like portion 3A in different directions, are provided, the holding effect of the main body shape can be suitably enhanced. In the heat radiating fin 1 of FIG. 7, when the intermediate support portion 3B and the further intermediate support portion 3C of the shape holding portion 3 are further increased, the shape holding performance can be further improved.

  Moreover, it is preferable that the shape holding | maintenance part 3 is comprised so that it may not prevent transmitting heat in the direction away from the connection part (part which receives heat) with the base | substrate 5. FIG. For this reason, when the shape holding portion 3 is provided across the carbon fibers of the main body of the radiating fin 1 so as to connect the carbon fibers of the main body of the radiating fin 1, In the cross section orthogonal to the direction in which the shape maintaining portion 3 that crosses the carbon fibers constituting the fin 1 crosses the carbon fibers, only a part of the cross section is preferably reinforced with resin.

  The above-mentioned “in the cross section perpendicular to the crossing direction of the shape holding portion crossing the carbon fiber, only a part of the cross section is reinforced with resin” means that all of the shape holding portions crossing the carbon fiber are used. It is not necessary that the cross-section is “a part of the cross-section is reinforced with resin”, and at least a part of the cross-section of the shape-holding portion crossing the carbon fiber is reinforced with a resin. It only has to be.

  In the first to sixth embodiments, the portion of the shape retaining portion 3 that crosses the carbon fibers in the X direction (the transverse portion of the shape retaining portion 3) is a cross-sectional view taken along the line AA in FIG. In the cross section orthogonal to the direction crossing the carbon fiber, only the surface of the radiation fin 1 is reinforced with resin as shown in FIG. For this reason, since the resin does not enter between the carbon fibers in the central portion of the crossing portion of the shape holding portion 3, the heat dissipation performance is higher than when the entire crossing portion of the shape holding portion 3 is reinforced with resin. Can be realized.

  As described above, by reinforcing only the surface portion of the shape holding portion 3 with resin, even if the shape holding portion 3 is provided in an arbitrary shape at an arbitrary position of the radiating fin 1, a desired heat dissipation performance is realized. Becomes easier. In the case where the shape maintaining portion 3 is provided on the thin plate-shaped heat radiating fin 1, only one surface of the crossing portion or only the surface of the crossing portion may be used as long as at least a part thereof is reinforced with a resin in a cross section perpendicular to the crossing direction of the crossing portion. Any part such as the central part of the transverse part may be reinforced with resin.

  Moreover, although the radiation fin 1 may be formed by arbitrary methods, for example, a prepreg shape in which a part of a carbon fiber sheet is cured by impregnating a carbon fiber with a thermosetting resin such as an epoxy resin is cured. It is preferable that the sheet is placed, heated and pressurized to be cured, and a part of the carbon fiber sheet is used as the shape maintaining portion 3.

  In the first embodiment, five rectangular pitch-based carbon fiber sheets having a length of 270 mm in the X direction, a length of 205 mm in the Y direction, and a length (thickness) of 0.2 mm in the Z direction are stacked and stacked. The prepreg sheets are arranged in the shape of the desired shape holding portion 3 on both sides of the sheet in the thickness direction. In addition, each carbon fiber sheet uses what the direction of the carbon fiber which comprises each carbon fiber sheet corresponds to a Y direction. And it presses, heating at 200 degreeC for 30 minutes (2000t). Then, the heat radiation fin 1 is manufactured by cooling and holding at room temperature for 2 hours. In addition, as for the radiation fin 1, the pitch-type carbon fiber part which has not arrange | positioned the prepreg sheet | seat is formed as the heat radiating part 2, and the part which has arrange | positioned the prepreg sheet | seat is formed as the shape maintenance part 3. Further, in the shape holding portion 3, the portion of the heat radiating fin 1 that crosses the carbon fiber (the portion extending in the X direction) is shaped so that the resin that reinforces the carbon fiber penetrates only the surface of the heat radiating fin 1. Among them, a prepreg sheet having a smaller amount of resin than a portion extending in the Y direction is used.

  As described above, when a prepreg sheet is placed on a part of the carbon sheet and heated and pressurized to produce a heat radiation fin, the shape retaining portion 3 is formed in a cost-saving and arbitrary shape by a simple manufacturing process. it can.

  In the process of manufacturing the radiating fin 1, a prepreg sheet may be disposed between each carbon fiber sheet, a resin sheet may be used instead of the prepreg sheet, and a part of the carbon fiber can be reinforced. If there is, the heat radiation fin 1 may be manufactured by forming the shape holding portion 3 by any method.

  In addition, when forming the radiating fins 1 by stacking and pressing a number of sheets of carbon fiber having a desired thickness, the direction in which heat is to be transmitted is fixed, such as when the part to which the heating element is connected is always fixed. If known, it is preferable to match the directions of the carbon fibers of each sheet. On the other hand, when there are a plurality of directions in which heat is to be transmitted, such as when the portion to which the heating element is connected fluctuates, the directions of the carbon fibers of each sheet may be varied. Also, a plurality of types of carbon fiber sheets such as a pitch-based carbon fiber sheet and a PAN-based carbon fiber sheet are stacked and stacked, and a prepreg sheet is placed on a part of the sheet to heat and pressurize to produce a heat radiation fin. Good.

  In addition, since the heat sink 10 according to the present embodiment is manufactured by fitting the radiating fins 1 to the base 5 having the groove portions 4 and bonding them, the heat sink 10 can be manufactured easily and at low cost. it can.

  According to the heat dissipating fin 1, the heat dissipating fin 1 for a heat sink having a main body made of carbon fiber connected to the base of the heat sink, wherein the main body is a part of the carbon fiber for maintaining the shape of the main body. The shape holding portion 3 reinforced with resin and the heat radiating portion 2 with the surface carbon fiber exposed without being covered with the resin, the shape holding the shape of the main body of the radiating fin 1 reinforced with resin. Good heat radiation performance can be realized by the heat radiation portion 2 where the carbon fibers on the surface are exposed while being held by the portion 3.

  The heat sink 10 is a shape holding portion 3 in which the base 5 that requires strength is made of a metal having high thermal conductivity, and the heat radiating fin 1 is reinforced with a part of carbon fiber with resin in order to hold the shape of the main body. And it is comprised by the thermal radiation part 2 which the carbon fiber of the surface exposed without being covered with resin, Therefore Weight reduction can be achieved suitably, maintaining a high shape maintenance performance and thermal radiation performance. For example, in the example of the heat sink 10 shown in FIG. 1, if the whole is composed of aluminum, the mass of the heat radiation target device 20 is about 20 kg. Weight reduction is expected in the mass of the degree.

  The present invention described above can be implemented in various other forms without departing from the spirit and essential features of the present invention. Accordingly, the examples described herein are illustrative and should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1 Fin 2 Heat radiation part 3 Shape holding part 3A Frame-shaped part 3B Intermediate support part 3C Further intermediate support part 4 Groove part 5 Base | substrate 10 Heat sink 20 Apparatus

Claims (5)

A heat dissipating fin for a heat sink having a main body made of carbon fiber connected to the base of the heat sink,
The main body has a shape holding portion in which a part of the carbon fiber is reinforced with resin in order to hold the shape of the main body, and a heat dissipation portion where the carbon fiber on the surface is exposed without being covered with the resin. A heat dissipating fin characterized by comprising.   The radiating fin according to claim 1, wherein the shape holding portion is provided in a peripheral portion of the main body that is not connected to the base body.   The radiating fin according to claim 2, wherein the shape holding portion is provided over the entire periphery of the main body that is not connected to the base body. The shape retaining portion is provided across the carbon fibers of the main body so as to connect the carbon fibers of the main body;
The cross section orthogonal to the crossing direction of the shape holding portion crossing the carbon fiber, only a part of the cross section is reinforced with the resin. Radiating fins. The radiation fin according to any one of claims 1 to 5,
A substrate having a groove,
The heat sink, wherein the heat radiation fin is connected to the groove.