Thermally conductive sheet and electronic device using same

Abstract

To provide a thermal-conductive sheet capable of easily being positioned and reducing the thermal resistance by absorbing the unevenness of a heat-generating unit and a heat-dissipating unit, and an electronic apparatus using the same.SOLUTION: The thermal-conductive sheet includes: a heat-generating component; a heat-dissipation member; and a sheet-like thermal conductive sheet material that is placed between the heat-generating component and the heat-dissipation member being abutted thereon. The electronic apparatus further includes a mounting sheet having a portion covering a part of the thermal conductive sheet material and a portion protruding from the outer periphery of the thermal conductive sheet material. At least a portion of the covering portion of the mounting sheet is attached to the thermal conductive sheet material, and at least a portion of the protruding portion of the mounting sheet is attached to the heat-generating component or the heat-dissipation member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a thermally conductive sheet provided between a heat-generating component and a heat-dissipating component, and an electronic device using the same. [Background technology]

[0002] In recent years, as electronic devices become more powerful, the amount of heat generated inside the devices has increased, making heat countermeasures important. For this reason, for example, thermal interface materials (hereafter referred to as TIM) such as silicone grease are placed between heat-generating and heat-dissipating components to quickly conduct heat. However, when silicone grease is used, if the heat-generating and heat-dissipating components repeatedly expand and contract due to heat, a phenomenon known as pump-out occurs in which the silicone grease is gradually discharged to the outside, making thermal conductivity prone to deterioration. For this reason, thermally conductive sheets such as graphite sheets are sometimes used.

[0003] As prior art document information related to the invention of this application, for example, Patent Document 1 is known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-10599 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the graphite sheet is slippery, making it difficult to position it accurately.

[0006] An object of the present disclosure is to provide a thermally conductive sheet that is easy to position and can absorb unevenness in heat-generating components and heat-dissipating components to reduce thermal resistance, and an electronic device using the same. [Means for solving the problem]

[0007] An electronic device according to one aspect of the present disclosure comprises a heat-generating component, a heat-dissipating member, and a sheet-shaped thermally conductive sheet material abutting the heat-generating component and the heat-dissipating member and disposed between them, and further comprises a mounting sheet having a portion covering part of the thermally conductive sheet material and a portion protruding from the outer periphery of the thermally conductive sheet material, at least a portion of the covering portion of the mounting sheet is attached to the thermally conductive sheet material, and at least a portion of the protruding portion of the mounting sheet is attached to the heat-generating component or the heat-dissipating member.

[0008] A thermally conductive sheet according to one embodiment of the present disclosure comprises a sheet-like thermally conductive sheet material, and an attachment sheet having a portion covering part of the thermally conductive sheet material and a portion protruding from the outer periphery of the thermally conductive sheet material, wherein when the initial thickness of the thermally conductive sheet material is T0 and the thickness of the thermally conductive sheet material when a pressure of 100 kPa is applied thereto is T1, the thickness of the attachment sheet is thinner than T0-T1.

[0009] A thermally conductive sheet according to one embodiment of the present disclosure comprises a rectangular, sheet-like thermally conductive sheet material, and an attachment sheet having a portion covering part of the thermally conductive sheet material and a portion extending beyond the outer periphery of the thermally conductive sheet material, the attachment sheet being provided on two opposing sides of the thermally conductive sheet material.

[0010] A thermally conductive sheet according to one embodiment of the present disclosure comprises a rectangular, sheet-shaped thermally conductive sheet material, and an attachment sheet having a portion covering part of the thermally conductive sheet material and a portion extending beyond the outer periphery of the thermally conductive sheet material, wherein the attachment sheet is provided around the entire outer periphery of the thermally conductive sheet material. Effect of the Invention

[0011] The thermally conductive sheet of the present invention can be fixed to a heat dissipating member or a heat generating component with the attachment sheet of the portion protruding from the graphite sheet. At the same time, when pressure is applied to the thermally conductive sheet, the graphite sheet is more easily compressed than the thickness of the attachment sheet. Therefore, the exposed portion of the graphite sheet can be closely attached to the heat dissipating member and the heat generating component, ensuring stable thermal conductivity. [Brief description of the drawings]

[0012] [Figure 1] 1 is an exploded perspective view of a thermally conductive sheet according to a first embodiment of the present disclosure. FIG. [Diagram 2] FIG. 4 is a top view of the thermally conductive sheet in the embodiment. [Diagram 3] 3 is a cross-sectional view of the thermally conductive sheet according to the embodiment taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a top view of a thermally conductive sheet according to a first modified example of the embodiment. [Diagram 5] FIG. 11 is a top view of a thermally conductive sheet according to a second modified example of the embodiment. [Figure 6] 4 is a cross-sectional view of an electronic device using the thermally conductive sheet in the embodiment. [Figure 7A] 5A to 5C are cross-sectional views showing a process for attaching the thermally conductive sheet in the embodiment to an electronic device. [Figure 7B] 5A to 5C are cross-sectional views showing a process for attaching the thermally conductive sheet in the embodiment to an electronic device. [Figure 8] 11 is a cross-sectional view of a first modified example of an electronic device using the thermally conductive sheet in the embodiment. FIG. [Figure 9] 11 is a top view of a first modified example of an electronic device using the thermally conductive sheet in the embodiment. FIG. [Figure 10] 13 is a cross-sectional view of a second modified example of an electronic device using the thermally conductive sheet in the embodiment. FIG. [Figure 11] 13 is a top view of a second modified example of an electronic device using the thermally conductive sheet in the embodiment. FIG. [Figure 12]FIG. 11 is a cross-sectional view of a third modified example of an electronic device using the thermally conductive sheet in the embodiment. [Figure 13] 13 is a top view of a third modified example of an electronic device using the thermally conductive sheet in the embodiment. FIG. [Figure 14] FIG. 4 is a cross-sectional view of a thermally conductive sheet according to a second embodiment of the present disclosure. [Figure 15] 15 is an enlarged cross-sectional view of a region XV shown in FIG. 14 of the thermally conductive sheet in the embodiment. [Figure 16] 15 is an enlarged cross-sectional view of an area XVI shown in FIG. 14 of the thermally conductive sheet in the embodiment. [Figure 17] FIG. 4 is a bottom view of the thermally conductive sheet in the embodiment. [Figure 18] FIG. 4 is a top view of a thermally conductive sheet according to a first modified example of the embodiment. [Figure 19] FIG. 4 is a bottom view of a thermally conductive sheet according to a first modified example of the embodiment. [Figure 20] 20 is a cross-sectional view of the thermally conductive sheet of the first modified example of the embodiment taken along the line XX-XX shown in FIG. 18. [Figure 21] FIG. 11 is a top view of a thermally conductive sheet according to a second modified example of the embodiment. [Figure 22] FIG. 13 is a top view of a thermally conductive sheet according to a third modified example of the embodiment. [Figure 23] FIG. 11 is a cross-sectional view of a thermally conductive sheet according to a fourth modified example of the embodiment. [Figure 24] FIG. 13 is a bottom view of a thermally conductive sheet according to a fifth modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A thermally conductive sheet according to a first aspect of the present disclosure includes a graphite sheet and an attachment sheet. The graphite sheet has a rectangular main surface. The attachment sheet is provided on the main surface of the graphite sheet. The attachment sheet covers the graphite sheet so as to extend beyond at least two opposing sides of the main surface of the graphite sheet. The main surface of the graphite sheet has a first region that is not covered by the attachment sheet and a second region that is covered by the attachment sheet. The graphite sheet has an initial thickness T0 and a thickness when a pressure of 100 kPa is applied T1, and the thickness of the attachment sheet is made thinner than (T0-T1).

[0014] Also, a thermally conductive sheet according to a second aspect of the present disclosure includes a graphite sheet, a mounting sheet, a separator, and a protective film. The graphite sheet has a rectangular main surface and a back surface opposite to the main surface. The mounting sheet is provided on the main surface of the graphite sheet. The mounting sheet covers at least two opposing sides of the main surface of the graphite sheet so as to protrude from the main surface. The separator is provided on the back surface of the graphite sheet. The protective film is provided on the main surface of the graphite sheet and on the mounting sheet. The main surface of the graphite sheet has a first region that is not covered by the mounting sheet and a second region that is covered by the mounting sheet. Furthermore, an end of the mounting sheet that protrudes from the graphite sheet abuts against the protective film.

[0015] With these embodiments of the thermally conductive sheet, the portion of the attachment sheet that protrudes from the graphite sheet can be fixed to the heat dissipating member or heat generating component. At the same time, when pressure is applied to the thermally conductive sheet, the graphite sheet is more easily compressed than the thickness of the attachment sheet. Therefore, the exposed portion of the graphite sheet can be closely attached to the heat dissipating member and heat generating component, ensuring stable thermal conductivity.

[0016] In the thermal conductive sheet according to the third aspect of the present disclosure, in the second aspect, when the initial thickness of the graphite sheet is T0 and the thickness of the graphite sheet when a pressure of 100 kPa is applied is T1, the thickness of the mounting sheet is made thinner than (T0-T1).

[0017] A thermally conductive sheet according to a fourth aspect of the present disclosure is the second aspect, wherein a weak adhesive layer is provided on the surface of the protective film facing the attachment sheet.

[0018] A thermally conductive sheet according to a fifth aspect of the present disclosure is the second aspect, wherein the separator is provided with a slit that crosses between the portion of the mounting sheet that protrudes from the graphite sheet and the adhered area.

[0019] In the thermal conductive sheet according to the sixth aspect of the present disclosure, in the second aspect, the mounting sheet and the separator are adhered to each other, and the protective film and the mounting sheet are adhered to each other, and the adhesive strength between the mounting sheet and the separator is weaker than the adhesive strength between the protective film and the mounting sheet.

[0020] The thermally conductive sheet according to a seventh aspect of the present disclosure is the second aspect, further comprising a spacer between the mounting sheet and the protective film, and an end of the mounting sheet protruding from the graphite sheet abuts against the protective film via the spacer.

[0021] According to an eighth aspect of the present disclosure, in the thermally conductive sheet of any one of the first to seventh aspects, the attachment sheet covers the entire outer periphery of the main surface of the graphite sheet.

[0022] The thermal conductive sheet according to the ninth aspect of the present disclosure is any one of the first to seventh aspects. The graphite sheet is rectangular in shape. The two long sides of the graphite sheet are entirely covered with the mounting sheet. The short sides of the graphite sheet have a first portion that is not covered with the mounting sheet and a second portion that is covered with the mounting sheet.

[0023] An electronic device according to a tenth aspect of the present disclosure includes a heat dissipation member and the heat conductive sheet according to any one of the first to seventh aspects. In the electronic device, the heat conductive sheet is provided between a heat generating component and the heat dissipation member. The heat conductive sheet is attached to the heat dissipation member or the heat generating component by an attachment sheet at the outer periphery of the graphite sheet. In addition, the heat conductive sheet is in contact with the heat generating component and the heat dissipation member with the graphite sheet in the first region compressed.

[0024] In an electronic device according to an eleventh aspect of the present disclosure, compared to the electronic device according to the tenth aspect, the top surface of the heat generating component is abutted against the mounting sheet, terminals are drawn out from the side surface of the heat generating component, and the edge of the graphite sheet located on the side where the terminals are drawn out is entirely covered with the mounting sheet.

[0025] The thermally conductive sheet in the embodiment of the present disclosure will be described below with reference to the drawings. Note that the thermally conductive sheet and electronic device shown below are each a specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are examples and are not intended to limit the present invention. In addition, among the components in the following embodiments, components that are not described in the independent claims that indicate the highest concept will be described as optional components.

[0026] (First embodiment) (Thermal Conduction Sheet) FIG. 1 is an exploded perspective view of the thermally conductive sheet 11 in the first embodiment of the present disclosure, FIG. 2 is a top view of the thermally conductive sheet 11, and FIG. 3 is a cross-sectional view of the thermally conductive sheet 11 taken along line III-III. The graphite sheet 12 is a pyrolytic graphite sheet having a rectangular shape measuring approximately 60 mm in length and approximately 90 mm in width (approximately 60 mm x 90 mm) and having a thickness of approximately 100 μm. It is preferable to use a graphite sheet 12 having high compressibility, and the compression ratio when a pressure of 100 kPa is applied is approximately 35%. Here, the compression ratio is expressed as a percentage of the value of (T0-T1) / T0, where T0 is the initial thickness and T1 is the thickness when a pressure of 100 kPa is applied. In this embodiment, the thickness of the graphite sheet 12 is approximately 100 μm before a pressure of 100 kPa is applied, and is approximately 65 μm when a pressure of 100 kPa is applied.

[0027] As shown in FIG. 3, a mounting sheet 13 is provided on one surface (main surface) of graphite sheet 12. This mounting sheet 13 is provided along the outer periphery of graphite sheet 12, with a width of about 10 mm, so as to protrude from the outer periphery of graphite sheet 12 by about 5 mm. The mounting sheet 13 is a sheet for attaching graphite sheet 12 to electronic components, etc. The mounting sheet 13 is composed of a base material 13b and an adhesive layer 13a, and the adhesive layer 13a is provided on the surface of base material 13b facing graphite sheet 12. The thickness of mounting sheet 13 including adhesive layer 13a is about 10 μm. Therefore, the thickness of mounting sheet 13 is thinner than (T0-T1). In addition, the center of graphite sheet 12 sandwiched between mounting sheets 13 is exposed. The area of ​​the main surface of graphite sheet 12 where mounting sheet 13 is not provided is called first area 12a. Moreover, the region of the main surface of graphite sheet 12 where attachment sheet 13 is provided is referred to as second region 12b.

[0028] (First Modification) FIG. 4 shows a top view of a thermally conductive sheet 11 according to a first modified example of the first embodiment. As shown, only the two long sides of graphite sheet 12 may be covered with attachment sheet 13.

[0029] (Second Modification) A top view of thermally conductive sheet 11 according to a second modified example of the first embodiment is shown in Fig. 5. As shown in Fig. 5, almost the entire outer periphery of graphite sheet 12 may be covered with mounting sheet 13, with cutout portion 16 formed on the short side. That is, the short side of graphite sheet 12 may have a first portion that is not covered with mounting sheet 13 and a second portion that is covered with mounting sheet 13. This prevents air from accumulating between heat-generating component 14 or heat-dissipating member 15 and thermally conductive sheet 11, which would increase the thermal resistance.

[0030] (electronic equipment) FIG. 6 is a cross-sectional view of an electronic device using the thermally conductive sheet 11 according to the first embodiment. Examples of electronic devices include power transistors such as IGBTs. These are used as components for base stations, motor drives, and in-vehicle applications. The thermally conductive sheet 11 is attached to the heat dissipation member 15 by the attachment sheet 13 protruding from the outer periphery of the graphite sheet 12, and the heat-generating component 14 is pressed and fixed to the thermally conductive sheet 11 with a pressure of about 200 kPa. The graphite sheet 12 is compressed by this pressure of about 200 kPa, and deforms in accordance with the unevenness of the heat-generating component 14 and the heat dissipation member 15 to adhere closely to them. Therefore, the thermal resistance between the heat-generating component 14 and the heat dissipation member 15 is reduced, and the heat dissipation efficiency of the electronic device is improved.

[0031] (Method of manufacturing electronic device using thermally conductive sheet 11) Next, a method for manufacturing an electronic device using thermally conductive sheet 11 will be described with reference to Figures 7A and 7B. Specifically, Figures 7A and 7B are cross-sectional views showing the steps of attaching thermally conductive sheet 11 to an electronic device. First, as shown in FIG. 7A, the thermally conductive sheet 11 is attached to a heat dissipation member 15 such as a heat sink. Here, the attachment sheet 13 protrudes from the periphery of the graphite sheet 12. Therefore, the attachment sheet 13 allows the thermally conductive sheet 11 to be easily positioned in an accurate position. Next, as shown in FIG. 7B, the heat generating component 14 is attached on the surface of the exposed graphite sheet 12. Then, a predetermined pressure F is applied from the heat generating component 14 to compress the graphite sheet 12. At this time, the pressure F is preferably about 100 to 300 kPa. Even if the area including the attachment sheet 13 is compressed at the same time, by making the thickness of the attachment sheet 13 sufficiently thin, the exposed graphite sheet 12 is also subjected to sufficient pressure and compressed. Therefore, even if the heat dissipation member 15 and the heat generating component 14 are uneven, the exposed part of the graphite sheet 12 can be brought into close contact with the heat dissipation member 15 and the heat generating component 14, and the thermal resistance can be reduced.

[0032] It is particularly advantageous to make the thickness of mounting sheet 13 thinner than (T0-T1). This is because when pressure is applied to graphite sheet 12, first region 12a becomes approximately flush with the surface of mounting sheet 13. This allows exposed portions of graphite sheet 12 to be more closely attached to heat dissipation member 15 and heat-generating component 14.

[0033] Furthermore, by making mounting sheet 13 cover the entire outer periphery of graphite sheet 12, it is possible to prevent graphite powder from falling or scattering from the ends of graphite sheet 12, thereby improving the reliability of the electronic device.

[0034] (First Modification of Electronic Device) A cross-sectional view of a first modified example of an electronic device using the thermally conductive sheet in the first embodiment is shown in FIG. 8. A top view of the modified example of the electronic device is shown in FIG. 9. For convenience of explanation, the heat dissipation member 15 is omitted in FIG. 9. As shown in FIG. 8, the terminal 1 of the heat generating component 14 is When using a graphite sheet 12 in which terminals 17 are pulled out from the side, it is desirable to have the entire side of graphite sheet 12 located on the side where terminals 17 are pulled out covered with mounting sheet 13 as shown in Fig. 9. This makes it possible to prevent adverse effects caused by graphite powder falling or scattering from the end of graphite sheet 12 onto terminals 17.

[0035] (Second modified example of electronic device) A cross-sectional view of a second modified example of an electronic device using the thermally conductive sheet in the first embodiment is shown in Fig. 10. A top view of the modified example of the electronic device is shown in Fig. 11. For convenience of explanation, the heat dissipation member 15 is omitted in Fig. 11.

[0036] In the electronic device according to the second modified example, the area of ​​the upper surface of graphite sheet 12 is larger than the area of ​​the upper surface of heat-generating component 14. The other configurations are the same as those of the electronic device according to the first modified example. Even with this configuration, it is possible to prevent adverse effects caused by graphite powder falling or scattering from the end of graphite sheet 12 onto terminals 17.

[0037] (Third modified example of electronic device) A cross-sectional view of a third modified example of an electronic device using the thermally conductive sheet in the first embodiment is shown in Fig. 12. A top view of the modified example of the electronic device is shown in Fig. 13. Note that the heat dissipation member 15 is omitted in Fig. 13 for convenience of explanation.

[0038] In the electronic device of the third modified example, the area of ​​the upper surface of graphite sheet 12 is smaller than the area of ​​the upper surface of heat-generating component 14. The other configurations are the same as those of the electronic device of the first modified example. Even with this configuration, it is possible to prevent adverse effects caused by graphite powder falling or scattering from the end of graphite sheet 12 to terminals 17.

[0039] Second embodiment (Thermal Conduction Sheet) Fig. 14 is a cross-sectional view of the thermally conductive sheet 21 in the second embodiment of the present disclosure, Fig. 15 is an enlarged cross-sectional view of region XV of the thermally conductive sheet 21 in Fig. 10, Fig. 16 is an enlarged cross-sectional view of region XVI of the thermally conductive sheet 21 in Fig. 14, and Fig. 17 is a bottom view of the thermally conductive sheet 21 with the separator 24 removed.

[0040] Graphite sheet 22 is a pyrolytic graphite sheet having a rectangular shape of approximately 60 mm x 90 mm and a thickness of approximately 100 μm. It is preferable to use graphite sheet 22 having high compressibility, and the compression ratio when a pressure of 100 kPa is applied is approximately 35%. Here, the compression ratio is expressed as a percentage of the value of (T0-T1) / T0, where T0 is the initial thickness and T1 is the thickness when a pressure of 100 kPa is applied.

[0041] Fig. 15 is an enlarged cross-sectional view of region XV near the end of graphite sheet 22 in Fig. 14. Also, Fig. 16 is an enlarged cross-sectional view of region XVI near the end of mounting sheet 23 in Fig. 14.

[0042] An attachment sheet 23 is provided on one surface (main surface) of graphite sheet 22. This attachment sheet 23 is provided along the outer periphery of graphite sheet 22 with a width of about 10 mm, so as to extend about 5 mm beyond the outer periphery of graphite sheet 22. Attachment sheet 23 has base material 23b made of polyethylene terephthalate (hereinafter referred to as PET), and an adhesive layer 23a made of acrylic is provided on the surface of base material 23b facing graphite sheet 22. The thickness of attachment sheet 23 including adhesive layer 23a is about 10 μm. Therefore, the attachment sheet The thickness of graphite sheet 22 is thinner than (T0-T1). The center of graphite sheet 22 sandwiched between mounting sheets 23 is exposed. The region of the main surface of graphite sheet 22 where mounting sheet 23 is not provided is called first region 22a. The region of the main surface of graphite sheet 22 where mounting sheet 23 is provided is called second region 22b.

[0043] Separator 24 having a thickness of about 75 μm is provided on the surface (rear surface) where graphite sheet 22 is entirely exposed (the lower surface of graphite sheet 22 in FIGS. 14 and 15). Release material 24a made of silicone resin is provided on the surface of separator 24 facing graphite sheet 22. Therefore, the portion of mounting sheet 23 protruding from graphite sheet 22 is weakly bonded to separator 24 by release material 24a.

[0044] Moreover, a protective film 25 having a thickness of about 50 μm is provided on the surface (main surface) on which mounting sheet 23 is provided (the upper surface of graphite sheet 22 in FIGS. 14 and 15). A weakly adhesive layer 25a made of silicone is provided on the surface of this protective film 25 facing mounting sheet 23. The end of mounting sheet 23 protruding from graphite sheet 22 is adhered to protective film 25 by weakly adhesive layer 25a. Here, weakly adhesive layer 25a refers to an adhesive layer that has appropriate adhesiveness to the target material and does not leave any adhesive residue on the target material when peeled off.

[0045] By configuring it as described above, the adhesive force between the mounting sheet 23 and the separator 24 is weaker than the adhesive force between the protective film 25 and the mounting sheet 23, since the adhesive layer 23a is made of acrylic and hardly adheres to the release material 24a made of silicone resin.

[0046] This thermally conductive sheet 21 is attached to a heat dissipation member such as a heat sink. First, the separator 24 is peeled off from the thermally conductive sheet 21. Since the adhesive strength between the mounting sheet 23 and the separator 24 is weaker than the adhesive strength between the protective film 25 and the mounting sheet 23, only the separator 24 can be peeled off.

[0047] The portion of mounting sheet 23 that protrudes from graphite sheet 22 is thin and therefore difficult to maintain its shape. In this embodiment, the end of mounting sheet 23 that protrudes from graphite sheet 22 is adhered to protective film 25, so that the shape can be maintained. Since it can be attached to the heat dissipation member while fixed to this protective film 25, it can be easily positioned in an accurate position. Thereafter, protective film 25 is peeled off. By making the adhesive strength between protective film 25 and mounting sheet 23 weaker than the adhesive strength between mounting sheet 23 and the heat dissipation member, protective film 25 can be easily peeled off.

[0048] Next, a predetermined pressure is applied to the exposed surface of graphite sheet 22 by the heat generating component to compress the graphite sheet. The pressure at this time is preferably about 100 to 300 kPa. Even if the area including mounting sheet 23 is compressed at the same time, by making mounting sheet 23 sufficiently thin, sufficient pressure is applied to exposed graphite sheet 22 as well, causing it to be compressed. Therefore, even if the heat dissipating member and the heat generating component are uneven, the exposed portion of graphite sheet 22 can be brought into close contact with the heat dissipating member and the heat generating component, thereby reducing the thermal resistance.

[0049] Furthermore, by making mounting sheet 23 cover the entire outer periphery of the graphite sheet, it is possible to prevent graphite powder from falling or scattering from the ends of graphite sheet 22, thereby improving the reliability of the electronic device.

[0050] (First Modification) A thermally conductive sheet 21 according to a first modified example of the second embodiment of the present disclosure will be described with reference to Figs. 18 to 20. This thermally conductive sheet 21 has slit lines 24b provided in a separator 24. Fig. 18 is a view of the thermally conductive sheet 21 seen from above a protective film 25, i.e., a top view. Fig. 19 is a view of the thermally conductive sheet 21 seen from below the separator 24, i.e., a bottom view. Fig. 20 is a cross-sectional view of the thermally conductive sheet 21 taken along line XX-XX in Fig. 18.

[0051] Separator 24 has slit lines 24b that cross the area that is bonded to mounting sheet 23 protruding from graphite sheet 22 and connect one side of separator 24 to the other side. Slit lines 24b are provided by making cuts in separator 24. By making slit lines 24b in separator 24, separator 24 can be made even easier to peel off from thermally conductive sheet 21.

[0052] (Second Modification) A top view of thermally conductive sheet 21 of a second modified example of the second embodiment of the present disclosure is shown in Fig. 21. Fig. 21 is a top view of thermally conductive sheet 21 with separator 24 and protective film 25 removed. As shown in Fig. 21, only the two long sides of graphite sheet 22 may be covered with attachment sheet 23.

[0053] (Third Modification) A top view of thermally conductive sheet 21 of a third modified example in the second embodiment of the present disclosure is shown in FIG. 22. FIG. 22 is a top view of thermally conductive sheet 21 with separator 24 and protective film 25 removed. As shown in FIG. 22, graphite sheet 22 may cover almost the entire outer periphery and have a cutout portion 26 on the short side. That is, the short side of graphite sheet 22 may have a first portion that is not covered by attachment sheet 23 and a second portion that is covered by attachment sheet 23. This can prevent air from accumulating between the heat-generating component or heat-dissipating member and the thermally conductive sheet, which would increase the thermal resistance.

[0054] In the above embodiment, the adhesive layer 23a is not provided on the protective film 25 side of the mounting sheet 23, and the weak adhesive layer 25a is provided on the mounting sheet 23 side of the protective film 25, but the weak adhesive layer 25a may not be provided on the protective film 25 side, and the adhesive layers 23a may be provided on both sides of the mounting sheet 23. In this case, the same effect can be obtained by making the adhesive strength between the mounting sheet 23 and the separator 24 weaker than the adhesive strength between the protective film 25 and the mounting sheet 23, and making the adhesive strength between the protective film 25 and the mounting sheet 23 weaker than the adhesive strength between the mounting sheet 23 and the heat dissipation member.

[0055] (Fourth Modification) FIG. 23 shows a cross-sectional view of thermally conductive sheet 21 of the fourth modified example in the second embodiment of the present disclosure. Before attaching graphite sheet 22 to an electronic device or the like, it is desirable to secure a space between graphite sheet 22 and protective film 25 so that protective film 25 does not come into contact with the surface of graphite sheet 22 as much as possible. For this reason, as shown in FIG. 23, spacer 27 made of PET having a thickness of about 60 μm may be provided between attachment sheet 23 and protective film 25. In this case, the end of attachment sheet 23 protruding from graphite sheet 22 is configured to be bonded to protective film 25 via spacer 27. Furthermore, by making the adhesive force between spacer 27 and protective film 25 stronger than the adhesive force between spacer 27 and attachment sheet 23, spacer 27 and protective film 25 can be peeled off at the same time after being attached to the heat dissipation member.

[0056] (Fifth Modification) A bottom view of the thermally conductive sheet 21 of the fifth modified example of the second embodiment of the present disclosure is shown in Fig. 24. Fig. 24 is a bottom view of the thermally conductive sheet 21 with the separator 24 removed. As shown in Fig. 24, the size of the protective film 25 and the separator 24 may be made larger than the area where the mounting sheet 23 is provided, and a plurality of through holes 28 may be provided in the protective film 25 outside the area where the mounting sheet 23 is provided. Providing the through holes 28 in the protective film 25 can be used for alignment when attaching it to a heat dissipation member or a heat-generating component. [Industrial Applicability]

[0057] The thermally conductive sheet according to the present disclosure can be positioned with high precision, and a thermally conductive sheet with low thermal resistance can be obtained, making it industrially useful. [Explanation of symbols]

[0058] 11, 21 Thermal conductive sheet 12, 22 Graphite sheet 12a, 22a 1st area 12b, 22b 2nd area 13, 23 Installation sheet 13a, 23a Adhesive layer 13b, 23b base material 14 Heat generating parts 15 Heat dissipation material 16, 26 Notch 17 Terminal 24 Separator 24a Release agent 24b Slit Line 25 Protective Film 25a Slight adhesive layer 27 Spacer 28 Through hole

Claims

1. A heat generating component; A heat dissipation member; a sheet-shaped thermally conductive sheet material that is in contact with the heat generating component and the heat dissipating member and is provided between them; Equipped with a mounting sheet having a portion covering a part of the thermally conductive sheet material and a portion protruding from an outer periphery of the thermally conductive sheet material; At least a portion of the covering portion of the mounting sheet is attached to the thermally conductive sheet material; At least a part of the protruding portion of the mounting sheet is attached to the heat generating component or the heat dissipating member. electronic equipment.

2. At least a part of the covering portion of the mounting sheet is sandwiched between the heat-generating component and the heat dissipation member.

2. The electronic device according to claim 1.

3. the thermally conductive sheet material is compressed by the heat generating component and the heat dissipation member; 3. The electronic device according to claim 1 or 2.

4. The thermally conductive sheet material is rectangular, The mounting sheet is provided on two opposing sides of the thermally conductive sheet material. The electronic device according to any one of claims 1 to 3.

5. The mounting sheet is provided around the entire outer periphery of the thermally conductive sheet material. The electronic device according to any one of claims 1 to 4.

6. When the initial thickness of the thermally conductive sheet material is T0 and the thickness when a pressure of 100 kPa is applied to the thermally conductive sheet material is T1, The thickness of the mounting sheet is thinner than T0-T1. The electronic device according to any one of claims 1 to 5.

7. The thermally conductive sheet material is made of a graphite sheet. The electronic device according to any one of claims 1 to 6.

8. A sheet-like thermally conductive sheet material; an attachment sheet having a portion covering a part of the thermally conductive sheet material and a portion protruding from an outer periphery of the thermally conductive sheet material; A thermally conductive sheet comprising: The thermally conductive sheet has compressibility, When the initial thickness of the thermally conductive sheet material is T0 and the thickness when a pressure of 100 kPa is applied to the thermally conductive sheet material is T1, The thickness of the mounting sheet is thinner than T0-T1. Thermal conductive sheet.

9. The thermally conductive sheet material is rectangular, The mounting sheet is provided on two opposing sides of the thermally conductive sheet material. The thermal conductive sheet according to claim 8.

10. The mounting sheet is provided around the entire outer periphery of the thermally conductive sheet material. The thermal conductive sheet according to claim 8 or 9.

11. A rectangular, sheet-shaped thermally conductive sheet material; an attachment sheet having a portion covering a part of the thermally conductive sheet material and a portion protruding from an outer periphery of the thermally conductive sheet material; Equipped with The mounting sheet is provided on two opposing sides of the thermally conductive sheet material. Thermal conductive sheet.

12. A rectangular, sheet-shaped thermally conductive sheet material; an attachment sheet having a portion covering a part of the thermally conductive sheet material and a portion protruding from an outer periphery of the thermally conductive sheet material; Equipped with The mounting sheet is provided around the entire outer periphery of the thermally conductive sheet material. Thermal conductive sheet.

13. The thermally conductive sheet material is made of a graphite sheet. The thermal conductive sheet according to any one of claims 8 to 12.

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