CN204707402U

CN204707402U - Heat transfer sheets

Info

Publication number: CN204707402U
Application number: CN201520469793.1U
Authority: CN
Inventors: 坂口佳也; 藤井健史
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2014-07-04
Filing date: 2015-07-02
Publication date: 2015-10-14
Anticipated expiration: 2025-07-02
Also published as: JP2016018813A

Abstract

The purpose of this utility model is to provide a kind of can improve Heat transmission amount, small-size light-weight and the heat transfer sheets of flexibility excellence significantly.The feature of described heat transfer sheets is, by folding graphite flake (11), folding part (11a) is set, touch each other at folding part (11a) place graphite flake (11), upper and lower surface and the surrounding of graphite flake (11) are covered by insulating trip (12) and seal, by like this, can obtain guaranteeing Heat transmission amount, small-size light-weight and flexibility and heat transfer sheets excellent in reliability.

Description

Heat transfer sheets

Technical field

The utility model relates to a kind of heat transfer sheets had in inside for smart mobile phone, tablet terminal etc. in the electronic equipment of heat generating components.

Background technology

In recent years, along with the high performance of various electronic equipment, the heating quantitative change of device interior is large, thus needs the countermeasure tackling this heat.Therefore, take and utilize conducting strip by the heat diffusion produced by heat generating components, the countermeasure of diffusing.The pyrolytic graphite sheet that the conductive coefficient in this direction, conducting strip many uses face is high.

It should be noted that, as relevant to the utility model of this application such as, in first technical literature information, known patent document 1.

Patent documentation 1: Japanese Unexamined Patent Publication 2013-242904 publication

But the thickness of pyrolytic graphite sheet is at most 100 μm, be therefore difficult to improve Heat transmission amount, when the heating quantitative change of heat generating components is large, be difficult to the countermeasure carrying out fully tackling heat.Although also use heat pipe as the large parts of Heat transmission amount, with regard to heat pipe, because shape becomes large, becomes heavy, lacks flexibility, thus there is the problems such as the degree of freedom of design is little.

Utility model content

The purpose of this utility model is to provide a kind of thin, light and heat transfer sheets of flexibility excellence.

The utility model is in order to the feature of the heat transfer sheets of first scheme solving above-mentioned problem and provide, by folding graphite flake, folding part is set, described in the place of described folding part, graphite flake touches each other, and upper and lower surface and the surrounding of described graphite flake are covered by insulating trip and seal.

The heat transfer sheets of alternative plan of the present utility model, based on first scheme, is characterized in that, has: described folding part; And described graphite flake is only the region of one deck.

The heat transfer sheets of third program of the present utility model, based on first scheme, is characterized in that, the number of plies of the described graphite flake at described folding part place is more than 5 layers and less than 20 layers.

Utility model effect

As described above, by making graphite flake touch each other, thus can obtain improving significantly Heat transmission amount, small-size light-weight and the heat transfer sheets of flexibility excellence.

Accompanying drawing explanation

(a) of Fig. 1 is the vertical view of the heat transfer sheets in an execution mode of the present utility model, and (b) of Fig. 1 is the cutaway view of this heat transfer sheets.

(a) ~ (c) of Fig. 2 is the figure be described the manufacture method of the heat transfer sheets in an execution mode of the present utility model.

Symbol description:

11 pyrolytic graphite sheets

11a folding part

12 insulating trips

Embodiment

Below, with reference to accompanying drawing, the heat transfer sheets in an execution mode of the present utility model is described.

(a) of Fig. 1 is the vertical view of the heat transfer sheets in an execution mode of the present utility model, and (b) of Fig. 1 is the important part cutaway view of this heat transfer sheets.The pyrolytic graphite sheet 11 that thickness is about 25 μm is folded into corrugated at central portion and forms folding part 11a.Pyrolytic graphite sheet 11 makes this folding part 11a thickening by overlap 9 layers.In addition, at 11a place, folding part, pyrolytic graphite sheet 11 touches each other.Herein, contiguity refers to the state that pyrolytic graphite sheet 11 keeps in touch each other under the state not applying power.Can pass through to press energetically under the state being folded pyrolytic graphite sheet 11, thus make the concavo-convex of the surface of pyrolytic graphite sheet 11 deform and utilize anchoring effect to realize tightlock status simultaneously.

And, be used as insulating trip 12 by PETG (the being designated as PET below) film being about 5 μm at the upper and lower surface coating thickness of the pyrolytic graphite sheet 11 defining folding part 11a, thus cover the upper and lower surface of pyrolysis graphite flake 11 and around seal.Insulating trip 12 with the face faced by pyrolytic graphite sheet 11 on be provided with adhesive linkage, around pyrolytic graphite sheet 11, fitted each other by this adhesive linkage and firmly combined.Therefore, it is possible to prevent the pyrolytic graphite sheet 11 touched from peeling off each other.Herein, the part that insulating trip 12 is fitted each other is the part of about 2mm from pyrolysis graphite flake 11.

Usually, even if folding pyrolysis graphite flake, also gap can be produced because of the elasticity of pyrolytic graphite sheet between pyrolytic graphite sheet.Therefore, thermal conductivity is therebetween deteriorated, and can not get and folding corresponding Heat transmission amount.On the other hand, remain the state of contiguity each other by pyrolytic graphite sheet 11 as present embodiment, thus the Heat transmission amount roughly corresponding with the layer of overlap can be obtained.

And preferred pyrolytic graphite sheet 11 is that the region of one deck extends from the both sides of folding part 11a.By like this, a large amount of heat transported by folding part 11a can be made also to the regional diffusion of one deck.

In addition, if the number of plies overlapping at 11a place, folding part is less than 4 layers, then its effect diminishes, and on the other hand, if more than 21 layers, then overall thickness becomes blocked up and flexibility is also poor.Therefore, the number of plies of the pyrolytic graphite sheet 11 at 11a place, folding part is preferably made to be more than 5 layers and less than 20 layers.

It should be noted that, in the above-described embodiment, employ with the face faced by pyrolytic graphite sheet 11 on be provided with the insulating trip 12 of adhesive linkage, but also can be used in the two-sided tape that two sides is provided with adhesive linkage.

Next, the manufacture method of the heat transfer sheets in an execution mode of the present utility model is described.

First, thickness is about the polyimide film pyrolysis of 50 μm, carries out burning till carrying out graphitization at about 2600 DEG C.By pressing with the first press pressure it, thus obtain the pyrolytic graphite sheet 11 with flexibility.The thickness of pyrolytic graphite sheet 11 is now about 27 μm.By this pyrolytic graphite sheet 11 being cut to mould the shape of regulation, thus obtain the pyrolytic graphite sheet 11 of (a) of Fig. 2.By this pyrolytic graphite sheet 11 is overlapping in the dotted line part office bending of (a) of Fig. 2, thus make it the shape of (b) becoming Fig. 2.Pressed with the second press pressure larger than the first press pressure by the pyrolytic graphite sheet 11 of the state of (b) to Fig. 2, thus pyrolytic graphite sheet 11 is touched each other.Consequently, the thickness of one deck pyrolytic graphite sheet 11 is about 25 μm.

By under the state making pyrolytic graphite sheet 11 touch each other on its two sides coating thickness be about the PET film of 5 μm, and cut off PET film in the neighboring area of pyrolytic graphite sheet 11, thus can obtain, as (c) of Fig. 2, the upper and lower surface of pyrolytic graphite sheet 11 and surrounding insulating trip 12 are covered the heat transfer sheets be sealed to form.

It should be noted that, in the above-described embodiment, make pyrolytic graphite sheet 11 touch insulating trip 12 of fitting afterwards each other, but also can to fit afterwards insulating trip at folding pyrolysis graphite flake, by pressing with the second press pressure on insulating trip, thus pyrolytic graphite sheet is touched each other.By like this, operation can be simplified further.

Industrial applicibility

With regard to heat transfer sheets of the present utility model, can obtain having large Heat transmission amount, small-size light-weight and the heat transfer sheets of flexibility excellence, thus industrially useful.

Claims

1. a heat transfer sheets, is characterized in that,

Arrange folding part by folding graphite flake, described in the place of described folding part, graphite flake touches each other,

Upper and lower surface and the surrounding of described graphite flake are covered by insulating trip and seal.

2. heat transfer sheets according to claim 1, is characterized in that,

Have:

Described folding part; And

Described graphite flake is only the region of one deck.

3. heat transfer sheets according to claim 1, is characterized in that,

The number of plies of the described graphite flake at described folding part place is more than 5 layers and less than 20 layers.