JPH0331013Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a multi-contact earth spring used in mobile radio terminal equipment, etc. The present invention is a multi-contact earth spring that has a structure that allows good contact to be maintained even during vibrations and shocks. Regarding earth springs.

When a mobile radio is installed, such as a mobile terminal such as a car phone, it does not give much vibration or shock to the installed device if it is driven on a flat road, etc., but
When driving on roads in the mountains, etc., the installed equipment is subject to large vibrations and shocks, so we solder the printed circuit board that carries the electronic circuit mounted inside the equipment, and attached the other end to the equipment casing. An earth spring that makes contact at one point in the earthing structure can separate due to vibration or impact, or become incompletely grounded due to plastic deformation, so there is a strong demand for the development of a multi-contact earth spring that is strong against vibration and impact. .

[Conventional technology]

In FIG. 3, a is a side view of the conventional earth spring, and b is a perspective view of the earth spring.

In FIG. 3b, one end of each of the plurality of earth springs 4, which are formed by bending an elastic and conductive metal plate, such as a phosphor bronze plate, into a U-shape is connected to the printed wiring board 1 as shown in FIG. 3a. It has a structure in which it is bonded by solder or the like to the location where the ground is to be dropped, and the other end is brought into contact with the casing 3 to be grounded.

[Problems to be solved by the invention] The above earth spring is applied to mobile radio terminal equipment, such as automobile radio terminal equipment, and when this terminal equipment receives unexpected vibrations or shocks, the earth spring 4 will be damaged as shown in Fig. 3a. As shown by the dotted line, the printed circuit board 1 is plastically deformed and no longer makes contact, and the printed wiring board 1 is lifted from the housing 3.
There were problems in that the characteristics of the device deteriorated, and it required a large amount of man-hours to solder the earth springs at predetermined locations, making the work difficult.

[Means for solving problems]

The present invention provides a multi-contact earth spring that solves the above-mentioned problems.The present invention is a multi-contact earth spring that brings a printed circuit board into contact with a housing, and the earth spring is made of an elastic conductive member. A semicircular notch is formed approximately at the center of both ends of a rectangular metal plate in the longitudinal direction, and an L-shaped notch in opposite directions is provided at the center along both sides in the width direction. , bent into a flat U-shape,
Make the cut and shape the tip of the contact piece into a round shape,
This is achieved by making the contact piece protrude from the bottom of the flat U-shape.

[Effect]

The multi-contact earth spring described above is easy to solder to a printed wiring board, and has multiple contacts (in the example, 2 contacts).
Since it has a structure with a contact point, it is highly resistant to vibration and shock and is practical.

〔Example〕

Embodiments of the multi-contact earth spring according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view for explaining an embodiment of a multi-contact earth spring according to the present invention, and parts equivalent to those in FIG. 3 are designated by the same reference numerals.

The multi-contact earth spring shown in the figure has a semicircular notch 22 formed approximately in the center of both longitudinal ends of a rectangular phosphor bronze plate made of an elastic and conductive metal, for example, and L in opposite directions to each other
A letter-shaped notch 23 is provided and it is bent into a flat U-shape. And a contact piece 24 in which an L-shaped notch 23 is formed.
The tip of the contact piece 24 is formed into a round shape, and the contact piece 24 is formed into a flat U shape.
It has a structure in which bent portions 21 at both longitudinal ends of the multi-contact earth spring 2 protruding outward from the bottom of the letter shape are soldered to the printed wiring board 1. Notch 22
is to improve solder circulation.

FIG. 2 is a side view for illustrating a mounting example of the multi-contact earth spring according to the present invention, in which the same parts as in FIG. 1 are given the same reference numerals.

The multi-contact earth spring 2 described in FIG. 1 is soldered to several earth contacts on the printed circuit board 1, and mounted on the casing 3 via a buffer member (not shown).

In this embodiment, the material of the multi-contact earth spring 2 has been described as phosphor bronze, but it is not limited to phosphor bronze, and may be made of elastic nickel silver or other materials.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the number of parts is reduced and the soldering workability is improved.
Since reliable soldering can be performed, cost reduction can be expected.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining an embodiment of a multi-contact earth spring according to the present invention, FIG. 2 is a side view for explaining an embodiment of a multi-contact earth spring according to the present invention, and FIG. In order to explain a conventional earth spring, a is a side view of the mounted earth spring, and b is a perspective view of the earth spring. In the figure, 1 is a printed wiring board, 2 is a multi-contact earth spring, 3 is a housing, 4 is an earth spring, 21 is a bent part, 22 is a notch, 23 is an L-shaped notch, and 24 is a contact piece. .

Claims (1)

[Scope of utility model registration request] A multi-contact earth spring for bringing a printed wiring board into contact with a housing, wherein a semicircular notch is formed approximately in the center of both longitudinal ends of a rectangular metal plate made of an elastic conductive member. The metal plate having L-shaped notches in opposite directions at the center along both sides in the width direction is bent to form a flat U-shape, and the tip of the contact piece is formed into a round shape by making the incisions. . A multi-contact earth spring, characterized in that the contact piece protrudes from the bottom of the flat U-shape.