CN201352894Y

CN201352894Y - Electromagnetic shielding shell

Info

Publication number: CN201352894Y
Application number: CNU2008201773399U
Authority: CN
Inventors: 张炎
Original assignee: Nantong Xinying Design Service Co Ltd
Current assignee: Beijing Huamao precision electronic Albert new company
Priority date: 2008-11-07
Filing date: 2008-11-07
Publication date: 2009-11-25
Anticipated expiration: 2018-11-07

Abstract

The utility model provides an electromagnetic shielding shell, which consists of an inner layer, an outer layer and an electromagnetic shielding layer sandwiched in between; wherein, the inner layer and the outer layer are made of engineering plastic; and the electromagnetic shielding layer is made of conductive polymer. Compared with the conventional metal shells with the electromagnetic shielding function and composite conductive plastics mixed with metal fibers or metal powder, the electromagnetic shielding shell has the advantages of light weight, simple fabrication, low cost and leakage prevention, and can be used as the shells of electronic and electric devices such as monitors, cases or mobile phones.

Description

A kind of shielding casing

Technical field

The utility model relates to a kind of shielding casing that is used for electronic electric equipment.

Background technology

Along with science and technology development, the mankind have entered information-intensive society, and the electronic electric equipment of Shi Yonging is more and more aborning, and the electromagnetic energy of electromagnetic wave outside radiation just with the speed increase of annual 7%-14%, pollute serious day by day by electromagnetic environment.And on the other hand, the electronic electric equipment sensitiveness of electromagnetic environment to external world increases, and electronic electric equipment very easily is subjected to outside electromagnetic interference and makes it produce misoperation, thereby has serious consequences.Therefore, have the brand-new electronic equipment and the device of good electromagnetic shielding ability, become the problem that information industry is needed solution badly.

The shell of traditional electronic electric equipment is made of metal, though have good capability of electromagnetic shielding, has the cost height, the shortcoming that weight is big.The electronic product shell material that uses has substituted original metal material by a large amount of plastic products at present, but, common high molecular materials is an insulator, for electromagnetic wave, almost can not absorb and reflect, has no screening ability, the performance that does not have anti-electromagnetic interference, therefore, various composite conductive plastics are developed the sheathing material as electronic electric equipment, and composite conductive plastic is meant the macromolecular material through having conductivity behind the physical modification, it generally is matrix with the polymer, add various conductive fillers, as carbon black, graphite, carbon fiber, metal powder, metallic fiber, metal oxide etc., conductive filler is dispersed in the polymer, by injection or the compound functional composite material of making of method such as extrusion molding with capability of electromagnetic shielding, the more traditional metal of composite conductive plastic compare have in light weight, the advantage that total cost is low.But miniaturization day by day along with electronic electric equipment, need further reduce the weight of equipment, and since the density of conductive filler in the composite conductive plastic much larger than polymeric matrix, must have certain content again at least and could guarantee capability of electromagnetic shielding, thereby can't further reduce weight, also can't further reduce the cost of conductive filler, composite conductive plastic exists also that mechanical property is inhomogeneous, mechanical strength is not high in addition, easily the problem of electric leakage.

In order to address the above problem, the utility model provides a kind of shielding casing, can address the above problem, compare with the traditional metal shell and the composite conductive plastic of pick-up metal fiber or metal dust, have in light weight, make simple, with low cost, prevent from the advantage of leaking electricity to be applicable to display casing, casing or phone housing.

The utility model content

The utility model provides a kind of shielding casing, and have internal layer, skin and be clipped in wherein electro-magnetic screen layer, described internal layer and outerly form by engineering plastics, described electro-magnetic screen layer is formed by conducting polymer.Described engineering plastics are Merlon, polysulfones, polyamide, polyphenylene oxide or polyformaldehyde.Described conducting polymer is polyaniline, polythiophene, poly alkyl fluorene, poly-fluorenes, polyparaphenylene.Wherein electro-magnetic screen layer can form the pattern with mesh.Described shielding casing is used for display casing, casing or phone housing.

In addition, the utility model is not limited to said structure, in the scope that does not deviate from technological thought of the present utility model, can carry out various variations.

Description of drawings

The utility model will become more obvious by describing embodiment with reference to the following drawings in detail, wherein:

Fig. 1 is the profile according to the shielding casing of an embodiment of the present utility model.

Fig. 2 is the schematic diagram according to the electro-magnetic screen layer in the shielding casing of another embodiment of the present utility model.

Embodiment

Following with reference to accompanying drawing, the specific embodiment of the utility model execution mode is described in detail.Preferred embodiment of the present utility model shown in the drawings, however the utility model may be embodied as multi-form, and should not be construed as the embodiment that is confined to provide herein.

Fig. 1 is the profile that expression is used to illustrate an embodiment of shielding casing of the present utility model.In Fig. 1, shielding casing 100 has the structure of internal layer 103/ electro-magnetic screen layer 102/ skin 101, internal layer and outer by engineering plastics formation, and it can be selected from Merlon, polysulfones, polyamide, polyphenylene oxide or polyformaldehyde.Electro-magnetic screen layer is formed by conducting polymer, it can be selected from has solubility or dispersed polyaniline, polythiophene, poly alkyl fluorene, poly-fluorenes, polyparaphenylene, the preferred polyethylene dioxythiophene that uses, especially the conducting polymer of forming by polyethylene dioxythiophene and polystyrolsulfon acid, because solubilized or be dispersed in water or solvent in, therefore easily be coated on the engineering plastics.For example, select for use Merlon to form internal layer 103, the aqueous dispersions of the electroconductive polymer that constitutes at one surface painting polyethylene dioxy thiophene and polystyrolsulfon acid to be forming electro-magnetic screen layer 102 then, and then forms the skin 101 that Merlon constitutes on electroconductive polymer layer.Preferably, use binding agent to improve intensity between layer and layer, binding agent can be selected from epoxy resin, polyurethane.In addition, shielding casing 100 of the present utility model can also have multilayer electro-magnetic screen layer 102, promptly have engineering plastics/electroconductive polymer layer/engineering plastics, repeated in this way structure, thereby can further improve the capability of electromagnetic shielding of shielding casing 100, and, can also select to have the electroconductive polymer layer of different numbers at the needs of different electromagnetic shieldings.

Fig. 2 is the schematic diagram according to the electro-magnetic screen layer in the shielding casing 100 of another embodiment of the present utility model.As shown in Figure 2, under the situation that guarantees effectiveness, the electro-magnetic screen layer 102 that is formed by conducting polymer composite can have the shape of mesh, has reduced the material use on the one hand; On the other hand, the internal layer 103 that is positioned at electro-magnetic screen layer 102 both sides can contact by mesh mutually with outer 101, thereby has further improved the mechanical strength of shielding casing 100.

Because the cost of conducting polymer is cheap relatively, thereby shielding casing of the present utility model has advantage with low cost; And compare with the traditional metal shell and the composite conductive plastic of pick-up metal fiber or metal dust, the utility model also has in light weight, makes simple advantage; Because internal layer and skin all are engineering plastics, therefore shielding casing of the present utility model also has insulation characterisitic, thereby can prevent electric leakage; Shielding casing of the present utility model can be widely used in electronic electric equipments such as display casing, casing or phone housing.

Though described preferred embodiment of the present utility model above in detail, but should be appreciated that multiple changes and improvements that those skilled in the art carry out the basic utility model design of instruction herein will drop within the category of the present utility model that claim limits.

Claims

1. shielding casing has internal layer, skin and is clipped in wherein electro-magnetic screen layer, it is characterized in that: internal layer and outerly form by engineering plastics, electro-magnetic screen layer is formed by conducting polymer.

2. shielding casing as claimed in claim 1 is characterized in that: wherein electro-magnetic screen layer forms the pattern with mesh.

3. shielding casing as claimed in claim 1 is characterized in that: wherein have the multilayer electro-magnetic screen layer in the shielding casing.