JPH071834Y2 - Contact structure of finger contact - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a contact part structure of a finger contact used for a contact part of a shield opening / closing part between a door and a door frame of an anechoic chamber or a shield room.

[Prior art]

At the shield opening / closing part between the door and the door frame in the anechoic chamber or shield room, in order to secure the electromagnetic shield, a finger contact is attached to one of the door or the door frame, and the other is brought into contact with this finger contact. And the door frame are in electrical contact.

[Problems to be solved by this invention] It is desirable that the entire contact portion is made of a metal having a low electric resistance property. Generally, a metal having a low electric resistance property is rustproof, processable, and costly. There is a problem with
Many of those with excellent workability have high electrical resistance characteristics.

From the above, stainless steel is used as the shield material 4 as shown in FIGS. 2 and 3 as satisfying the conditions of rust prevention, workability, appearance and durability.
There is a problem that the electric resistance is high and a sufficient shielding effect cannot be obtained.

In order to solve such a problem, one of two contact members mounted so as to make electrical contact is coated with a conductive paint, and a conductive strip is mounted thereon, and the other conductive member is attached to the conductive strip. A contact part structure has been developed in which two contact members are electrically contacted via a conductive paint and a finger contact by electrically contacting a finger contact attached to the contact member. (See Japanese Examined Patent Publication No. 52-13364).

However, in such a contact portion structure, the low electrical resistance characteristic of the conductive paint is limited due to the coating method and the like, and the shielding effect is inferior to that of the metal plate having the low electrical resistance characteristic.
When a high-performance shield is required, there is a problem that not only a radio wave may be leaked but also a predetermined level of sealing effect may not be obtained.

This invention solves the disadvantages of the conventional shield opening / closing portion as described above, and provides a contact portion structure of a finger contact capable of forming a shield opening / closing portion excellent in rust prevention, workability, and shield characteristics. The purpose is to

[Constitution of device]

The contact portion structure of the finger contact according to this invention is
A V-shaped concave portion and a V-shaped convex portion which are formed of a shield plate having a high electric resistance characteristic, which is attached to the door frame and the door, respectively, at a contact portion of a shield opening / closing portion between the door frame and the door, and which are fitted to each other. And a metal plate having a low electric resistance characteristic is attached to both inner sides of the recess and the periphery of the recess, the finger contacts are provided on the metal plate, and one end of the metal plate is provided in the periphery of the recess. Fixed on the upper end, deformed by being pressed at the other end, extended so as to come into contact with the metal plates on both inner sides of the recessed part, and the convex part with which the finger contact comes into contact. It is configured by attaching metal plates having low electric resistance characteristics to both sides of the.

〔Example〕

Hereinafter, a contact portion structure of a finger contact according to the present invention will be described with reference to an illustrated embodiment. Fig. 1 (a)
In the above, a shield plate 4 made of stainless steel, which is a metal plate having high electric resistance characteristics, is attached to the surfaces of the door 1 and the door frame 2, respectively, and at the contact portion of the shield opening / closing portion between the door frame 2 and the door 1. The recess 1 ′ of the door 1 and the projection 2 ′ of the door frame 2 fitted in the recess 1 ′ are formed by the shield plate 4.

Metal plates 5 having a low electric resistance characteristic are continuously attached to both inner sides of the recess 1'and peripheral portions of both sides of the recess 1 ', and finger contacts 3 are attached on the metal plate 5.

Further, metal plates 5 having low electric resistance characteristics are also attached to the contact portions of the finger contacts 3 on both sides of the convex portion 2 '.

The finger contact 3 is placed on the metal plate 5 at one end thereof.
3a is fixed on the metal plates 5 around both sides of the recess 1 ', and the other end is easily deformed by being pressed to make a line contact with the metal plates 5 on both sides inside the recess 1'. It is attached so as to extend.

The metal plate 5 having a low electric resistance characteristic is formed by spraying copper, zinc, tin, silver or the like onto the shield plate 4. Depending on the case, both inner sides of the recess 1'and both open ends of the recess 1 '. Also, it may be attached to both sides of the convex portion 2'by being adhered by a conductive adhesive or by welding by soldering or the like.

In such a structure, when the door 1 is closed, the protrusion 2 '
Is fitted in the recess 1 ', and the finger contacts 3 are sandwiched from both sides by the metal plate 5 having a low electric resistance property so that the shield plates 4 of the door 1 and the door frame 2 are electrically connected.

In this case, the V-shaped concave portion 1'of the door 1 and the V-shaped convex portion 2'of the door frame 2 are fitted to each other, and the finger contacts 3 attached to both inner sides of the concave portion 1'are provided. By abutting on the metal plates 5 on both sides of the convex portion 2 ′, the shield between the door 1 and the door frame 2 is doubled, so that more reliable electrical shielding is achieved.

Further, when the door 1 is closed, even if the door 1 is partially narrowed between the door 1 and the door frame 2 due to problems such as the construction of the door 1 or manufacturing problems, the other end of the finger contact 3 When 3b is pressed, it is easily deformed and is attached to the metal plates 5 on both sides inside the recess 1'in a constant pressure so as to make line contact or surface contact, so that high shielding performance is maintained. It

Further, the finger contact 3 does not directly contact the inner side of the concave portion 1'and the side portion of the convex portion 2'of the shield plate 4 having a high electric resistance characteristic, but the metal plate 5 having a low electric resistance characteristic.
Since the finger contact 3 is in contact with the inside of the concave portion 1 ′ and the side portion of the convex portion 2 ′, the electric resistance of the contact portion is much smaller, and one end of the finger contact 3 is Since 3a is fixed on the metal plate 5 around the recess 1'by soldering or the like, electrical continuity between the metal plate 5 and the finger contact 3 is secured, and further, the other end 3b of the finger contact 3 is fixed. Since it extends over the metal plate 5 inside the recess 1 ′ and is easily deformed by being pressed to contact the metal plate 5, the contact area between the finger contact 3 and the metal plate 5 becomes large. The conductivity between the metal plate 5 and the finger contact 3 is further enhanced, and a high shield effect is obtained.

The electrical resistance of the contact portion is determined by the contact resistance value, contact area, etc. of the material. If the contact resistance value is small, and the contact area is large, the electrical resistance of the contact portion will be small and the shield performance will be improved.

Therefore, in order to improve the shield performance of the contact portion, the contact portion may be formed of a material having a small contact resistance value (material that is easily deformed) such as copper or zinc, and the contact area of the contact portion may be increased. .

Furthermore, the repeated sliding movement of the finger contact 3 does not cause rusting at the contact portion, and the same shielding effect as that of the metal itself of the metal plate 5 having a low electric resistance characteristic can be obtained.

As shown in FIG. 1 (b), a V groove 8 is formed in the convex portion 2 ′ of the door frame 2 to which the metal plate 5 having the low electric resistance characteristic is attached, and the finger contacts 3 are formed at both corners of the V groove 8. The shield effect can be enhanced by making line contact at two points on the part.

[Effect of device]

The embodiment of the contact portion structure of the finger contact according to the present invention is as described above, and has the following effects.

Even when the contact part of the door frame and the shield opening and closing part of the door is made of metal with high electric resistance characteristics such as stainless steel,
There is an effect that a contact portion structure of a finger contact excellent in rust prevention, workability and shield characteristics can be configured by an extremely simple method without using a particularly expensive shield material.

Also, when the door is closed, the V-shaped recess of the door and the V-shaped of the door frame
And the finger contacts attached to both sides inside the recess contact the metal plates on both sides inside the recess and on both sides of the protrusion to form the door. Since the shields between the door frames are doubled, there is an effect that the electric shield can be more reliably performed.

Further, the finger contact has one end fixed on the metal plate around the recess and the other end deformed by being pressed to extend so as to contact the metal plates on both sides inside the recess. Since it is attached with a finger, even if the door is closed, it can be easily finger-contacted even if it is partially narrowed due to problems such as building the door between the door and the door frame or manufacturing problems. It deforms and contacts the metal plate with a constant pressure,
Even if the door is improperly built, the high shielding effect can be obtained.

In addition, the finger contact does not directly contact the inner side of the concave portion and the side portion of the convex portion made of the shield plate having high electric resistance characteristics, but contacts through the metal plate having low electric resistance characteristics. Since one end is fixed on the metal plate around the recess, electrical continuity between the metal plate and the finger contact is secured, and the other end of the finger contact extends on the metal plate inside the recess. , Since it is easily deformed by being pressed and comes into contact with the metal plate, the contact area between the finger contact and the metal plate is increased, the conductivity between the metal plate and the finger contact is further enhanced, and a high shielding effect is obtained. can get.

[Brief description of drawings]

1 (a) and 1 (b) are sectional views showing an embodiment of a contact portion structure of a finger contact according to the present invention, and FIGS. 2 and 3 are sectional views showing an example of a conventional example. 1 ... door, 1 '... recessed portion, 2 ... door frame, 2' ... convex portion,
3 ... Finger contact, 4 ... Shield plate, 5 ...
... low electrical resistance metal plate, 6 ... door frame, 6 '... recess, 7 ... door, 7' ... knife edge, 8 ... V groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masafumi Katsumata 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Motoo Suzuki 3-4-5 Toyosu, Koto-ku, Tokyo Stocks Toyosu Plant of Tomoe-Gumi Steel Works (56) References: Sho 58-140695 (JP, U) JP 46-11765 (JP, B1) JP 52-13364 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A finger contact is provided between the shield frame of a door frame formed by attaching a shield plate having high electric resistance characteristics and the door frame formed by attaching a shield plate having high electric resistance characteristics. In the contact portion structure of the finger contact that electrically shields between the door frame and the door by interposing, the contact portion of the shield opening and closing portion of the door frame and the door, which is made of the shield plate, mutually, A V-shaped concave portion and a V-shaped convex portion that are fitted to each other are provided, and metal plates having low electric resistance characteristics are attached to both inner sides of the concave portion and the peripheral portion of the concave portion, and the fingers are provided on the metal plate. The contact is fixed so that one end thereof is fixed on the metal plate around the recess and the other end is deformed by being pressed to contact the metal plates on both inner sides of the recess. Present And mounting, Te, the contact portion structure of finger contacts, characterized by comprising attaching a metal plate of a low electrical resistance properties on both sides of the convex portion in which the finger contact is in contact.