JPS62105499A - Electronic equipment - 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 [Field of Industrial Application] The present invention relates to electronic devices such as personal computers, word processing sensors, and electronic musical instruments.

[Conventional technology]

In order to prevent electromagnetic interference to surrounding radios, televisions, etc. due to electromagnetic waves generated from the above-mentioned electronic devices,
Electromagnetic shielding can be applied to the inner surface of the plastic housing of electronic devices by applying paint containing metal such as nickel, spraying zinc, or molding the plastic housing itself with resin containing metal plates. Processing is being carried out.

By the way, the plastic casings of electronic devices are generally equipped with an electronic circuit +/3 to prevent the electronic circuit from malfunctioning or the semiconductor from being damaged by the heat generated by the electronic circuit. It is necessary to provide ventilation holes to dissipate the heat generated. For ventilation holes, for example, it is possible to create a large number of holes with a diameter of 1 to 3 mm when molding the casing, apply a metal paint such as nickel as described above, and perform a shielding treatment, but this will ensure sufficient heat dissipation. Currently, the width Approximately 3 mm of sulin is applied to the plastic casing to create a ventilation section for heat dissipation.

However, if a ventilation section with slits lined up like this is provided in the housing, the electrical opening will essentially become larger, even if the inner surface of the housing is shielded as described above. Electromagnetic shielding becomes insufficient. For this reason, it has been proposed to provide a metal plate having a large number of small holes for the purpose of electromagnetic shielding of this ventilation section. This proposal has the excellent advantage that electromagnetic shielding can be achieved without hindering ventilation by optimizing the size and number of small holes in the metal plate. However, in this case, it is necessary to electrically connect the electromagnetic shield plate installed on the wall that is not the ventilation section, but in the production process of electronic devices that are generally manufactured in Inuo, this connection can be made reliably without contact resistance. It is extremely troublesome to do so. In addition, if there is a poor connection, there will be a problem in which the expected power (itashield) will not appear.

[Problems that need to be solved]

An object of the present invention is to provide an electronic device in which a ventilation portion and a wall portion that is not a ventilation portion are electromagnetically shielded without requiring connection work.

[Means of problem solving]

The present invention is an electronic device in which the inner wall of the plastic casing is electromagnetically shielded, and at least one of the integrated walls that has a ventilation section and requires electromagnetic shielding is an integrated metal shield plate with no connecting parts on its entire surface. The part of the metal shield plate corresponding to the ventilation part is
This invention relates to an electronic device characterized in that it has a perforated portion having a large number of small holes that function as both an electromagnetic shield and an electromagnetic shield.

[Effect]

First, an "integral wall" in the present invention is defined as an independent wall that will not be separated into two parts even during inspection, repair, battery replacement, or other work during the practical use of electronic equipment. Note that even if three or multiple parts are connected by screws or the like for convenience in manufacturing the casing, if the separation described above does not occur in the practical stage, it is considered to be an integral wall.

This will be explained using an example. A casing having a structure in which three walls are integrally formed without connection and only the remaining part is removably fitted has at least two integral walls. A housing in which a pair of housing members are connected to each other via a hinge so as to be openable and closable also has at least two integral walls. When some of the walls of the housing are removably fitted, the core has at least two integral walls: a removable wall part and a remaining wall part.

In the present invention, among the above-mentioned integral walls, the entire surface of at least one wall that needs to be electromagnetically shielded and has a ventilation section is electromagnetically shielded by an integral metal shielding plate having no connection part. Ru.

The part of this metal shield plate that corresponds to the ventilation part of the integral wall is a perforated part with a large number of small holes that can achieve electromagnetic shielding without interfering with necessary ventilation. It is integrally connected to the part that electromagnetically shields the part of the wall that is not a ventilation part.

Since the electromagnetic shield employed in the present invention has the above-described structure, connection work between the electromagnetic shields is not required, and both necessary ventilation and electromagnetic shielding are sufficiently achieved in the ventilation section.

〔Example〕

The present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view of a personal non-viewer (however, the internal structure is not shown) which is an embodiment of the present invention, and FIG. FIG. 3 is a perspective view of a metal shield plate for shielding.

In Figures 1 and 2, a personal computer (
The casing 1) consists of a casing part (11) consisting of a front wall surface and a bottom surface, and a casing part (12) consisting of two walls and a rear wall surface, which are removably fitted into each other. There is. The housing part (12) has ventilation parts (121) and (122) on its upper wall and rear wall, respectively, and is a part that requires electromagnetic shielding, and has a metal shield on its inner wall. A board (2) is attached. The metal shield plate (2) consists of perforated parts (2I), (22) and a non-perforated part (23), and the perforated parts (21) and (22) are connected to the housing part (12), respectively. ) is provided at the position corresponding to the ventilation part (12+), (122), and the self-hole part (21), (22
) and the non-perforated part (23) are integrated into i! l! It has become.

The metal shield plate may be made of various metals, such as conductive metals such as copper, aluminum, and nickel, as well as iron-based metals that have conductivity and magnetism such as iron, steel, and silicon steel. The shape and number of holes in parts (21) and (22) may be arbitrary within a range that ensures both ventilation and electromagnetic shielding. Preferred materials for the metal shield plate are metals that can be easily soldered and plated on one or both sides of the above-mentioned iron-based metals for corrosion protection and improved solderability, such as copper, nickel, tin, lead, soft wax, and silver. It is plated with one or more types of gold, etc. In addition, the perforated part is
It has a large number of circular holes, and the diameter d of each circular hole is 0.5~
3 mm, and the hole pitch p (m11) is (d
+0.2> or more and preferably (d+3) or less. In addition, the thickness of the metal shield plate is 30 to 500 μm.
The thickness is approximately 50 to 200 μm. Since the perforated portion having the above-mentioned size of holes and pitch has an excellent electromagnetic shielding effect, the metal shield plate used in the present invention is made entirely of perforated portions, in other words, the ventilation of the integral wall. The other portions may also be electromagnetically shielded with a perforated metal shield plate. Further, the metal shield plate used in the present invention may have a layer of an electrically insulating material such as polyethylene, polyvinyl chloride, nylon, baked-on insulating varnish for windings, etc. on one or both sides thereof. In that case, electrical insulation from other parts of the electronic device can be achieved and there is no problem of short circuits.

〔effect〕

In the present invention, there is no need for the connection work between electromagnetic shields as in the past, so manufacturing is simplified, and
This eliminates the conventional problem of electromagnetic shield failure due to connection failure.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of a metal shield plate used in the embodiment of FIG. 1: Personal computer 11.1
2: Housing 121.122: Ventilation section

Claims (7)

[Claims] (1) An electronic device whose inner wall of a plastic case is electromagnetically shielded, and at least one of the integral walls that has a ventilation section and requires electromagnetic shielding is an integral metal shield plate with no connecting parts on its entire surface. An electronic device that is electromagnetically shielded by a metal shield plate, and a portion of the metal shield plate corresponding to the ventilation portion is a perforated portion having a large number of small holes that function as both ventilation and electromagnetic shielding. . (2) The electronic device according to claim 1, wherein the metal shield plate is a plate of ferrous metal. (3) The electronic device according to claim 2, which has a plating layer of an easily solderable metal on one or both sides of the iron-based metal. (4) The electronic device according to claim 1, wherein the metal shield plate is made of a metal that is conductive and easily solderable. (5) The perforated part has a large number of circular holes, the diameter d of each circular hole is 0.5 to 3 mm, and the hole pitch p (mm
) is (d+0.2) or more and (d+3) or less, the electronic device according to any one of claims 1 to 4. (6) The electronic device according to any one of claims 1 to 5, wherein the entire metal shield plate has uniform holes. (7) The electronic device according to any one of claims 1 to 6, wherein the metal shield plate has an electrically insulating layer on one or both sides thereof.