JPS59204300A - Case of electronic device or the like - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a case for electronic equipment and the like that can shield electromagnetic waves.

Cases for general electronic devices, such as the housing case of a personal computer, can cause electromagnetic waves generated from the outside to affect the electronic devices inside the case, or conversely, electromagnetic waves generated by the electronic devices inside the case to be emitted to the outside. In recent years, there has been a growing demand for prevention. Cases that can shield such electromagnetic waves have been known in the past by coating the outer surface with electromagnetic shielding material, but since the painted surface has the disadvantage of peeling, recently, electromagnetic shielding materials have been mixed. Cases made by injection molding of plastic and resin are attracting attention, but the electromagnetic wave shielding properties around the injection gate and other parts of the case are uneven, and the outer surface of the case is coated with electromagnetic shielding materials such as fibers. There was a problem of exposure and degrading the appearance.

The first object of the present invention is to provide an entire case consisting of a multi-layer blow molded case made of a thermoplastic plastic layer with a high electric shielding property and a thermoplastic plastic layer with a high resistance to blow molding. The purpose of this invention is to provide a case for electronic equipment with uniform electromagnetic shielding characteristics. In addition, the first object of the present invention is to provide the case member in the item 1-1.
611) on the 2nd wall, and the outer layer of the J-wall is made of heat-resistant plastic with a high blow ratio.

It is an object of the present invention to provide a case for electronic equipment, etc., which is constructed of the same material and has excellent appearance characteristics.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, / is a case of a personal computer, and the case / is a surface PL where the main body and the lid 3 are joined together.
It is joined at. This is a hinge that is integrally connected to the main body λ and the lid 3, and the main body λ and the lid 3 are aligned with the hinge as an axis point, and the latchter that is integrally connected to the lid 3 is attached to the main body and the lid 3. The case is closed by fitting into the receiving protrusion. Further, 7 is an operation panel such as a keyboard and a display section located on the front side of the personal computer.

In Figure 2, the electronic device g of the personal computer
is held by Case/. Main body and 2.7
The body 3 has a hollow two-wall structure with an inner wall 7 and an outer wall 10, and each wall has an inner layer made of thermoplastic plastic (hereinafter referred to as EMITP) with electromagnetic shielding properties. A, and an outer layer/B made of a high-blow-ratio thermal tiJ Vfi plastic material (referred to as TPj) that does not provide electromagnetic shielding properties. In addition, the boundary between the inner wall W and the outer wall 10 is located at the outer periphery of the mating surface PL, and the inner layer /A made of EMI is continuously extended from the mating surface P'L ((α) to prevent electromagnetic waves. Shield 1) Improves performance.

Below, the manufacturing method of the case/ according to the present invention will be explained based on FIGS. 3 and 7. //, /2 are divided molds, and one mold // has a convex key. , and a gate-shaped cavity /21 is formed in the other mold /2.

First, EMITP and TP are melt-kneaded in respective extruders (not shown) and joined in an extrusion gouer (not shown) connected from each extruder, so that the inner layer/3a is EMI
Consisting of TP, outer 1e/3b is TP KaranarullI
! Extrude vJ version j, '71 multi-layered ballisne/3. Next, convex cavity //1 and portal cavity /2
The parison is extruded and placed between 1 and 1.
The molds //, /2 are closed so that the molds #3 are gripped on the entire circumferential surface of the cavity edge C of the metal molds 11IJ//, /2. As a means of gripping, the Balisson/3 is pre-blow (E
This can be done by simply inflating (inflating) or by extruding a large 1" diameter ballison. Next, a compressed air shield +-+:, force fluid is introduced into the parimen/3 surrounded by the mold //, /2, and the balisne/3 is made into the convex cavity //'
The main body is constructed by expanding the concave cavity/, to a shape corresponding to the shape of 2+.

In addition, when manufacturing a case in which the main body λ and the lid 3 are connected together with a hinge, as shown in FIG. 1,
1. As shown in Kosho Dower/g7 Dower G, a hinge is formed by compressing and thinning approximately the middle of the extrusion direction of Balison/3 using a protrusion in a mold, and the hinge is located on both sides of the hinge. The main body and the lid 3 can be constructed by expanding the ballison/3.

Thermoplastic plastic with electromagnetic shielding properties (EMITP) is made of polyethylene, polypropylene,
Blow-moldable plastics such as polyamide and ABS, materials made by mixing resin, fibers, flakes or powdered carbon, iron, brass or aluminum, and plastics 1
．． It is a material that itself has good electromagnetic shielding properties. E.M.
In ITP, thermoplastic plastics, such as polyethylene.

Polyolefin such as polypropylene) / For 004 part, thickness SO~/Otsu 0μ, length /~/Imm iron,
It is preferable to use a material made of brass or aluminum fibers 70 to 1.10 weights 61 in terms of extruder kneading properties, intragay bonding properties, blow moldability, and electromagnetic shielding properties. In addition, the electromagnetic shielding property of E M Engineering T P is defined as having a volume resistivity of /Ω, 6 m or less, preferably /×70-Ω・on or less3, and a blower that does not have electromagnetic shielding properties. Thermoplastic plastics (TP) with a high ratio are polyethylene, polypropylene, polyamide + A B S '5 blow molding + Zf
It is a functional plasti, and it is gray, red + in TP.
Plasti made by mixing pigments other than black such as h' color and yellow 1. This is preferable in terms of outer 1311 time fil.

Note that a high blow ratio of TP indicates excellent elongation in the tjJ Vfi state, and by using a thermoplastic plastic with a high blow ratio, the depth 0. The embossed pattern of O5-01l- can be almost faithfully reproduced on the case surface, and a case with uniform wall thickness can be obtained. In addition, the TPO volume resistivity value is / 0'~10
It is 40Ω·α.

In addition, in the present invention, the case refers to a personal combination, -
Housing case members, carrying case members, etc. for electrical/electronic measuring instruments, electronic musical instruments, etc., using the case member of the present invention for a part of the case, for example, the main body part, A known case member can be used.

In the present invention, multilayer refers to two or more layers, and for example, it may be three layers, with the inner and outer layers made of TP' and the intermediate layer made of EMI. Even in the case of the above-mentioned three layers, by blow molding, the layer consisting of <EMITP as in the case of layer a can be constructed by continuously extending on the surface of the mating surface PL. In addition, since the material made of EMITP has poor blow moldability, EM'I
The average thickness ratio of the case wall between the layer made of TP and the layer made of TP is preferably set to 30:3θ to 7k.

In the above embodiment, the main body λ or the lid 3, which is the case part 4J, has a hollow double wall structure, so the inner wall 9 has ribs, recesses, etc. suitable for holding the electronic device g. The shape can be formed regardless of the curved shape of the outer wall 10, and it is easy to package.

Excellent in terms of lightness. Also, in Figure 2,
, the boundary between the inner wall 9 made of EMITP and the outer wall made of TP is located at the outer periphery of the mating surface PL, and the inner layer /A made of EMI extends continuously to the surface of PL, thereby providing electromagnetic wave shielding. Characteristics can be improved.

As described above, the present invention consists of a case member made of multilayer blow molding of a thermoplastic plastic layer provided with electromagnetic shielding properties and a thermoplastic plastic plastic layer provided with no electromagnetic shielding properties. A storage case for electronic devices etc. with uniform electromagnetic shielding properties can be obtained, and the case part 'M is constructed with a single wall, and the outer layer of the wall is made of thermoplastic plastic that has electromagnetic shielding properties and is not loaded. It is composed of It is possible to obtain an electronic device snow storage case with excellent appearance characteristics. In addition, if the outer layer of the case part according to the present invention is made of thermoplastic plastic with a high blow ratio and does not contain fillers such as fibers, the depth engraved on the mold may be 0.03 to 0. The embossed pattern of 'lvnm can be almost faithfully reproduced on the outer layer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a case according to the present invention, FIG. 2 is a sectional view of the main part of FIG. This is a schematic diagram. /@ One electronic device case Body 3 Inside lid 7 Wall 10 Outside Wall Patent applicant Kyoraku Co., Ltd.

Claims (1)

[Claims] /) Thermoplastic plastic with electromagnetic shielding properties;
A case for an electronic device, etc., characterized in that the case is made of a multilayer blow-molded case member made of a double layer, a thermoplastic plastic layer with a high blow ratio, and a seven layer. 2) A case for an electronic device or the like according to claim 1, wherein the case member has a double wall structure, and the outer layer of the wall is made of a thermoplastic plastic having a high flow ratio.