JPH0423497A - Structure for shielding case of electronic device - Google Patents

Abstract

PURPOSE:To acquire a electromagnetic shield structure of a light and easy-to- attach case of a electronic device by applying a metallic film all over an inner side of one half and by forming a structure which allows copper foil protruding from an outer periphery of a printed substrate to adhere to the metallic film all over an periphery of an edge part when both halves are combined. CONSTITUTION:In one layer of a printed board 1, a grounding copper foil 6 is sandwiched. The copper foil 6 has an external form size which protrudes from an outer edge of a rectangular printed board 1 by a specified length, and it is set to a size which allows the protruding part to be mounted on an outer peripheral edge of half bodies 2, 3 when contained in a case. Furthermore, a metallic film 8 of good conductivity is applied to a resin surface by deposition, etc., all over an inner side of the lower half part 3 in opposite to a radio signal processing part including an outer peripheral edge. The copper foil 6 of the printed board 1 and the metallic film 8 of the lower half body 3 are adhered during assembly. Since a resin case which can completely electromagnetically shield the device is used, easy manufacture and light weight can be realized.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to an electromagnetic shielding structure for a housing of an electronic device used at the end of communication, such as a mobile phone, and provides an electromagnetic shielding structure for a housing for an electronic device that is lightweight and easy to install. With the aim of In the electronic device housed in the housing, the inner surface of at least one half of the housing is coated with a metal coating over the entire surface, and when the two halves are combined to form the housing, the edges of the two halves are coated. The copper foil portion protruding from the outer periphery of the printed circuit board is in close contact with the metal film around the entire circumference of the printed circuit board.

[Industrial application field]

The present invention relates to an electromagnetic shielding structure for a housing of a communication terminal electronic device, such as a mobile phone.

[Conventional technology]

Since electronic devices such as mobile phones process weak wireless signals, it is necessary to provide a complete electromagnetic shield between them and the outside to block disturbances. For this reason, conventionally, the casing that houses the device body is made of metal, and the casing itself has a shielding function.

[Problem to be solved by the invention]

However, if a metal casing is used, it not only increases manufacturing costs but also tends to be heavy, which is especially true for mobile phones and other devices where portability is one of the important functional characteristics. In some cases, it is not desirable.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and provide an electromagnetic shielding structure for an electronic device housing that is lightweight and easy to install.

[Means to solve the problem]

The purpose of this is to place the main body of an electronic device, which is made up of a laminated printed circuit board in which a grounding copper foil larger than the external dimensions of the printed circuit board is sandwiched between the intermediate layers in a sand-inch pattern, into a resin housing consisting of upper and lower halves. In the electronic device housed in the housing, a metal coating is applied to the entire inner surface of at least one half of the housing, and when the two halves are combined to form a housing, the edges of the two halves are coated. This is achieved by a housing shield structure for an electronic device characterized in that a copper foil portion protruding from the outer periphery of the printed circuit board is in close contact with the metal film on the entire periphery.

[Effect]

Due to the copper foil on the printed circuit board and the metal coating on the inside of the housing,
The electronic circuit mounted on the surface of the printed circuit board facing the metal film is completely electromagnetically sealed. Therefore, even when processing weak radio signals, disturbances caused by external disturbances can be prevented.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 is an exploded perspective view showing the structure of a portable telephone to which the present invention is applied, and FIG. 2 is a side sectional view thereof.

The main body of the electronic device is composed of electronic circuits (not shown) mounted on both sides of a laminated printed board 1.

The casing that houses the printed circuit board 1 is composed of an upper half 2 and a lower half 3 that are molded from a resin material and have a rectangular planar shape.
are put together from above and below, and the printed circuit boards 1 are housed in a substantially sealed space by fitting protrusions 4 and corresponding holes 5 provided at a predetermined pitch on the respective outer peripheries. do.

The printed circuit board 1 is a so-called laminated printed circuit board, and a grounding copper foil 6 is sandwiched between its negative layer. This copper foil 6 has a thickness of, for example, about 0.2 mm or less and an external size that protrudes from the outer edge of the rectangular printed circuit board 1 by a predetermined width, and when housed in the housing, the protruding The dimensions are such that the part rests on the outer periphery of the half 2.3. The outer peripheral edge thereof has a cut 7 as shown in FIG. 3 at a position corresponding to the hole 5 and projection 4. The function of this cutting lower will be described later.

One surface (the upper surface in FIGS. 1 and 2) of this printed circuit board 1 is equipped with an electronic circuit that constitutes the control section of the telephone, and the other surface (lower surface) is equipped with a wireless signal processing section. It is assumed that this is installed.

Since this wireless signal processing section handles weak signals, it needs to be completely electromagnetically shielded to prevent disturbances. Therefore, in the present invention, a highly conductive metal film 8 is coated on the resin surface by vapor deposition or the like over the entire inner surface of the lower half body 3 facing the wireless signal processing section, including the outer periphery. ing.

To assemble this telephone, as shown in Fig. 1, the printed circuit board 1 is placed between the upper and lower halves 2. Put it in between. Then, by fitting the protrusion 4 of the upper half body 2 and the hole 5 of the lower half body 3 through the cut lower provided in the copper foil 6, as shown in FIG. 4, the copper foil 6 can be easily deformed. and protrusion 4
It also enters the hole 5. As a result, the copper foil 6 of the printed circuit board 1 and the metal film 8 of the lower half 3 are brought into close contact, and the wireless signal processing section mounted on the lower surface of the printed circuit board 1 is formed of the copper foil 6 and the metal film 8. It is completely enclosed within the enclosed space and completely shielded from the outside.

In the example shown in FIG. 5, as another means for bringing the copper foil 6 and the metal film 8 into close contact, the outer peripheral edge of the upper half body 2 is constructed with a double outer wall 9 and an inner wall 10, and both walls are The side wall 11 forming the outer peripheral edge of the lower half body 3 is sandwiched between them, and the copper foil 6 of the printed circuit board 1 is attached to the metal film 8 applied to the side wall 11.
is in full contact with. When the two halves 2 and 3 are further brought into contact with each other, the claws 9a provided on the outer wall 9 engage with the locking portions 11a provided on the side wall 1, so that the two halves are integrated. It has become. According to this example, the contact area between the copper foil 6 and the metal film 8 is significantly increased, and more complete conduction can be obtained.

In the example shown in FIG. 6, a wave-shaped unevenness 12 is provided on the outer peripheral edge of the lower half body 3, and a wave pattern (not shown) having a complementary shape is provided on the upper half body 2. The copper foil 6 of the printed circuit board 1 has the wave-shaped unevenness 12 on its outer periphery.
An L-shaped cut 13 is provided to correspond to the above.

If the printed circuit board 1 is sandwiched between the upper and lower halves 2.3 in a sandwich-like manner as described above, the copper foil 6 will be sandwiched between the upper and lower corrugated concavities and convexities 12 that have mutually complementary shapes. 13
With the help of, the copper foil 6 is deformed up and down corresponding to the wave pattern,
As shown in FIG. 7, it is in close contact with the metal coating 8 of the lower half body 3. In this case, printed circuit board 1. Upper and lower halves 2
, 3 are integrally fixed with screws through tapped holes 14 provided at their four corners.

In any case, in order to facilitate the deformation of the four corners, it is desirable to cut the corners of the copper foil 8 and make cuts 15 of an appropriate number and length, as shown in FIG.

〔Effect of the invention〕

As described in detail above, according to the present invention, a grounding copper foil is laminated as one layer of a laminated printed circuit board, the outer periphery of the copper foil is made to protrude outside the printed circuit board, and this is removed when assembling the device. The electronic circuit mounted on one side of the printed circuit board is completely shielded electromagnetically by being brought into close contact with the metal film applied to the inner surface of the resin case. Since a resin casing can be used, manufacturing is easy and lightweight.

Furthermore, since shield processing is performed at the same time as assembly, the number of manufacturing steps can be reduced.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the configuration of an electronic device according to an embodiment of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a cross-shaped cut provided on the outer periphery of the copper foil. FIG. 4 is a partially enlarged sectional view of the retaining area of the casing, FIG. 5 is a sectional view of the outer periphery of the casing in another embodiment of the present invention, and FIG. FIG. 7 is a partially enlarged perspective view of the outer periphery of the casing in yet another embodiment of the invention; FIG. 7 is a cross-sectional view; FIG. . 1 - Printed circuit board 2 - Upper half 3 - Lower half engaging projection engaging hole Copper foil cut - Metal coating outer wall 0 - inner wall 1 - side wall 2 - corrugated unevenness 3.14 - cut

Claims (3)

[Claims] 1. Grounding copper foil larger than the external dimensions of the printed circuit board (
6) is housed in a resin casing consisting of upper and lower halves (2, 3), in which the main body of the electronic device is constituted by a laminated printed circuit board (1) sandwiched between layers as an intermediate layer, The inner surface of at least one half (3) of the housing is coated with a metal coating (8) over the entire surface, and when the two halves (2, 3) are combined to form a housing, both halves (2, 3) A housing shield structure for an electronic device, characterized in that a copper foil portion (6) protruding from the outer periphery of a printed circuit board around the entire edge of the body (2, 3) is in close contact with the metal film (8). 2. An engagement hole (5) is provided on the outer periphery of the half body (3) on which the metal coating (8) is applied, and an engagement hole (5) is provided on the outer periphery of the other half body (2). A matable protrusion (6) is provided;
Claim 1: A cross-shaped cut (7) is provided on the outer peripheral edge of the copper foil (6) of the printed circuit board at a position corresponding to the projection (4) and the engagement hole (5) that can be fitted into each other. The housing shield structure described in . 3. The outer periphery of each half (2, 3) has corrugated irregularities (12) that complement each other, and the outer periphery of the copper foil (6) of the printed circuit board can be easily deformed to correspond to the corrugated shape. The housing shield structure according to claim 1, wherein the housing shield structure has an L-shaped cut (13).