JPS59207699A - Airtight housing - 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 (a) Technical Field of the Invention The present invention relates to an airtight casing as a countermeasure against electrostatic and electromagnetic shielding, and in particular, an airtight casing in which a conductive film is formed on a synthetic resin, which has good corrosion resistance and is lightweight. This relates to an airtight casing.

(b) Prior Art and Problems Conventionally, airtight casings for communication devices and the like that require electrostatic and electromagnetic shielding measures are generally made of steel plates. Such an airtight casing is shown in Figs. 1 and 2. Fig. 1 is a perspective view of a conventional airtight casing, and Fig. 2 is a sectional view of the main part. 2 is a box formed by bending a metal such as a steel plate and attaching grooves 21 and installation fittings 22; 3 is a backing made of synthetic rubber; 4 is a tightening screw; 5 is a grounding terminal; 6 is an airtight sea μ surface.

The lid 1 is formed by pressing a metal such as a steel plate,
A plurality of fasteners 11 and handles 12 are attached to the lens barrel 1, and a box 2 corresponding to the lens lid 1 is formed of metal, for example, a steel plate, by pressing, and the outer periphery of the upper surface of the lens barrel 2 is coated with synthetic rubber. At the same time, a groove 21 is bored to accommodate the backing 6 made of the above-mentioned lid 1, and a lid tightening metal fitting 2!1 and an installation metal fitting 22 are attached to the position corresponding to the mounting metal fitting 11 of the lid 1, and the installation metal fitting 2201 A grounding terminal 5 is attached at each location.An airtight casing having such a structure requires no electrostatic or electromagnetic wave shielding measures, and is easy to maintain airtightness and ground. However, there were problems such as corrosion resistance and weight.

(C) Purpose of the Invention In view of the above conventional problems, the present invention provides corrosion resistance by forming an airtight casing from a synthetic resin molded product and forming a conductive film on the airtight casing of the synthetic resin molded product. The overall purpose is to provide an airtight casing that is both good and lightweight.

(d) Structure of the invention To achieve the above object, the present invention utilizes electrostatic technology.

An airtight casing made of synthetic resin that houses equipment that requires electromagnetic shielding, in which a conductive film is formed on the airtight casing, and an elastic member is interposed between the lid of the casing and the box. Achieved by forcing.

(e) Embodiments of the Invention Hereinafter, embodiments of the airtight casing according to the present invention will be described in detail with reference to the drawings.

FIG. 6 is a side sectional view for explaining one embodiment of the present invention, and the same reference numerals are used for the same parts as the previous one.
7 is a lid made of a synthetic resin molded product and has a plurality of fastening parts 71 protruding from the outer periphery; 8 is a lid made of a synthetic resin molded product and has a stepped part 81 on the inner surface and a plurality of lid fixing parts 82 on the upper surface of the outer periphery. 9 is a lid 1;
and a conductive film formed on the inner surface of the box 2, 10 an airtight sealing surface, and 14 a rubber backing made of conductive rubber or the like.

The lid 7 has a tightening part 71 protruding from the periphery by molding a synthetic resin, for example, plastic, a stepped part 81 and a lid fixing part 82 are formed on the inner surface of the upper part by molding plastic, and a metal bushing 16 slightly protrudes into the inside of the box 8. A conductive film 9 is formed on the inner surface of each of the integrally molded boxes 8 by zinc spraying, conductor coating, conductor plating, or the like. In this case, the conductive film 9 is also attached to the inner protrusion of the metal bushing 16, and the grounding terminal 5 is attached to the external tip of the metal bushing 16 for grounding.

After the conductive film 9 is completely formed on the inner surfaces of the lid 7 and the box 8 of the airtight housing, the airtight seal 10 between the lid 7 and the box 8 is polished or otherwise removed as shown in FIG. The conductive film 9 is finished so as not to be scraped off. And stepped part 8 of box 8
1, a backing 14 made of conductive rubber or the like is fitted, a lid 7 is placed on the lid 7, and the lid 7 is screwed with a tightening screw 4.

In this embodiment, the conductive film 9 is described as being formed only on the inner surface, but it may be formed on the entire surface, and the synthetic resin material is not limited to plastic.

Depending on the place of use, other synthetic resin molded products may be used.

(f) Effects of the Invention As is clear from the above description, the airtight casing of the present invention has higher corrosion resistance than conventional metal airtight casings.
It has the advantage of being lightweight and is extremely effective when applied to various devices that require electrostatic and electromagnetic shielding.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a perspective view and a sectional view of a main part of a conventional airtight casing, and FIG. 3 is a side sectional view of an embodiment of an airtight casing according to the present invention. FIG. 4 is a side sectional view for fully explaining the wear-resistant surface. In the figure, 1 and 7 are lids, and 2 and 8 are boxes. 6 and 14 are backings, 4 is a tightening screw, 5 is a ground terminal, 6 and 10 are airtight sealing surfaces, 9 is a conductive film, 1
1 is a tightening fitting, 12 is a handle, 16 is a metal bushing, 22
23 is an installation fitting, 23 is a lid tightening fitting, 71 is a tightening part, 81 is a stepped part, and 82 is a lid fixing part. Figure 1 z2 Figure 3 P4147v4 □ Figure 2 Figure 4 473-

Claims (1)

[Claims] An airtight casing made of synthetic resin that houses equipment that requires electrostatic and electromagnetic shielding, in which a conductive film is formed on the airtight casing, and an elastic member is entirely inserted between the lid of the casing and the box. An airtight casing characterized by an airtight casing.