Composite sheet, production method thereof and electronic apparatus using the same

Patent metadata

Field	Value
Publication number	US-2016016378-A1
Application number	US-201514746365-A
Country	US
Kind code	A1
Filing date	Jun 22, 2015
Priority date	Jul 18, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A composite sheet includes a graphite layer, a heat insulation layer including a fiber and a heat insulation material and a fiber layer located between the graphite layer and the heat insulation layer, wherein the fiber layer comprises the fiber. An electronic apparatus includes an electronic component that involves heat generation, a housing and the composite sheet, wherein the composite sheet is placed between the electronic component and the housing.

First claim

What is claimed is:

1 . A composite sheet, comprising:
a graphite layer; a heat insulation layer including a fiber and a heat insulation material; and a fiber layer located between the graphite layer and the heat insulation layer, wherein the fiber layer comprises the fiber.

2 . The composite sheet according to claim 1 , wherein the fiber layer includes melted fiber.

3 . The composite sheet according to claim 1 , wherein the fiber and the fiber layer are integrated.

4 . The composite sheet according to claim 1 , wherein a recessed portion filled with the fiber layer is provided on a surface of the graphite layer.

5 . The composite sheet according to claim 1 , wherein the fiber is a nonwoven fabric.

6 . The composite sheet according to claim 1 , wherein the fiber has a diameter of 0.1 to 30 μm and a bulk density of 0.5 g/m 3 or less.

7 . The composite sheet according to claim 1 , wherein the heat insulation material comprises silica aerogel.

8 . The composite sheet according to claim 1 , wherein the graphite layer is obtained by heat-treating film.

9 . The composite sheet according to claim 1 , wherein the graphite layer has a thickness of 0.1 mm or less, a heat conductivity in a surface direction of 1,000 W/m·K or more, and a heat conductivity in a thickness direction of 20 W/m·K or less; and the heat insulation layer has a thickness within a range of 0.05 mm to 1 mm, and a heat conductivity within a range of 0.01 to 0.1 W/m·K.

10 . The composite sheet according to claim 1 , further comprising:
a second graphite layer that is located on a surface of the heat insulation layer, the surface being opposite to the surface on which the graphite layer is located; and a second fiber layer located between the second graphite layer and the heat insulation layer, wherein the second fiber layer comprises the fiber.

11 . The composite sheet according to claim 1 , further comprising insulation films on both surfaces of the composite sheet.

12 . A method of producing the composite sheet of claim 1 , comprising:
overlapping the graphite layer and the heat insulation layer; then heating a side of the graphite layer to melt the fiber in the heat insulation layer that is present in a boundary face between the graphite layer and the heat insulation layer; and cooling the fiber to laminate the graphite layer and the heat insulation layer.

13 . An electronic apparatus, comprising:
an electronic component that generates heat; a housing; and the composite sheet according to claim 1 , wherein the composite sheet is placed between the electronic component and the housing.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Oikawa Kazuma
• Toyota Kei
• Kohmyohji Daido
• Sakatani Shigeaki

Classifications

• H10W40/10

  Arrangements for heating · CPC title

• H10W40/25

  characterised by their materials · CPC title

• B32B2307/304

  Insulating · CPC title

• B29L2031/3481

  Housings or casings incorporating or embedding electric or electronic elements · CPC title

• B32B5/18 Primary

  characterised by features of a layer {of} foamed material · CPC title