JPH02250276A - Grounding metal piece for printed circuit board - Google Patents

Abstract

PURPOSE:To mount a grounding metal piece in any desired place on a printed circuit board by bending a resilient conductive plate into W-form, equipping it at its center protrusion with a recess to serve for fixation to the printed circuit board, and connecting the grounding pattern of printed circuit board electrically with the chassis metal piece. CONSTITUTION:A canoe-shaped fit part 1 of a W-form grounding metal piece 4 made from a resilient conductive plate is fitted in a hole 7 provided in a printed circuit board 5. At this time, protrusions 3 at the two ends of this grounding metal piece 4 contact the grounding pattern 6 of the printed circuit board 5, while a chassis metal piece 8 is contacted by another protrusion 2 mating with the grounding metal piece fit part 1 when the printed circuit board 5 is installed at this chassis metal piece 8, and thus the grounding pattern 6 is connected electrically with the chassis metal piece 8 through the grounding metal piece 4. Thereby grounding pattern in any desired place on the printed circuit board 5 can be connected with the chassis metal piece 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of grounding a printed circuit board for the purpose of preventing unnecessary radiation.

[Conventional technology]

As described in Japanese Utility Model Application Publication No. 57-119592, a conventional device has a grounding fitting made of an elastic conductive plate bent in a U-shape or V-shape, which is sandwiched between the edges of the printed board and formed on the edge surface. The ground pattern was connected to the chassis metal fitting facing the printed board, or a metal piece was connected to the other end of the conductive wire soldered to the ground pattern and screwed to an arbitrary position on the chassis metal fitting.

[Problem to be solved by the invention]

The above conventional technology has two degrees of freedom in the ground position.

No consideration was given to cost, and when using a grounding fitting made of an elastic conductive plate bent in a zigzag pattern, the grounding pattern could only be provided at the edge of the printed board.
Furthermore, even when wire rods are used, there are problems such as the large number of parts and the direct material cost and two assembly man-hours.

An object of the present invention is to enable ground connection to be made not only at the edge of a printed board but also at any position using a single grounding fitting.

[Means to solve the problem]

In order to achieve the above objective, the shape of the elastic conductive plate is approximately W.
It is bent into a shape and has a fitting shape on the central protrusion for fixing to a printed board.

In addition, in order to complete the electrical connection between the printed board and the chassis mounting bracket, the height relationship between the protrusions at both ends of the grounding bracket and the opposing protrusions in the opposite direction between them must be adjusted between the printed board and the mounting chassis. The dimensions are such that it can be pressed sufficiently against the mounting chassis metal fittings.

Furthermore, in order to prevent incomplete connection due to variations in dimensions, the grounding fitting is made of a spring material and is made to follow it.

[Effect]

The earthing metal fitting is made of an elastic conductive plate, and has a substantially W-shaped central protrusion with a cassette-shaped fitting part, which is fitted into a hole provided in a printed board to fix the earthing metal fitting.

The tips of the grounding fittings extended in opposite directions on both sides of the fitting part are sized to contact the chassis fittings, and then bent in the opposite direction again and the tips are brought into contact with the grounding pattern of the printed board, thereby forming the grounding pattern of the printed board. and chassis metal fittings.

At this time, by making the grounding fitting sufficiently longer than the required dimension between the printed board and the chassis fitting, the elasticity increases the contact pressure between the grounding pattern of the printed board and the grounding fitting, making a sufficient electrical connection, and making the printed board, Since the mounting of the chassis metal fittings can follow dimensional changes due to variations, the electrical connection will not be interrupted.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1.2.3.

The screw-shaped fitting part -1 of the approximately W-shaped grounding fitting -4 made of an elastic conductive plate is attached to the 6-7 provided on the printed board -5. At this time, the protrusions at both ends of the grounding metal fitting -3 are connected to the earthing pattern -6 of the printed board, and the printed board -5 is connected to the chassis metal fitting -3.
Protrusion -2 facing the grounding fitting fitting part when attached to 8
is in contact with the chassis metal fitting-8, and the ground pattern-6 and the chassis metal fitting-8 are electrically connected via the grounding metal fitting-4.

According to this embodiment, it is possible to connect the earth pattern at any position on the printed circuit board to the chassis metal fittings, and since a plurality of parts are not required, there is an effect that parts costs and man-hours can be reduced.

When the ground pattern of the printed board is around the mounting hole, the shape of the ground metal fitting should be as shown in Figure 4.

〔Effect of the invention〕

According to the present invention, the grounding fitting can be installed not only at the edge of the printed board but also at any location where a fixing hole can be made, so the printed board can be grounded at a more effective position when taking measures against unnecessary radiation. There is an effect.

In addition, the method of grounding from any position on the printed board is as follows:
There is also a method of using conductive wire, but this requires multiple parts such as mounting brackets and screws in addition to the conductive wire, soldering of the conductive wire to the printed board, and installation work such as caulking to the metal fittings and tightening screws. Since only one grounding metal fitting is attached to the hole in the printed board, parts costs and man-hours can be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a grounding fitting according to an embodiment of the present invention;
The figure is a vertical cross-sectional view of the grounding bracket installed, Figure 3 is a plan view of the grounding bracket installed, and Figure 4 is a perspective view of the earthing bracket when the grounding pattern of the printed circuit board is provided around the mounting hole of the earthing bracket. . 1... Earth fitting fitting shape part. 2...The contact part of the grounding metal fitting with the chassis metal fitting. 3... Contact part of the grounding metal fitting with the printed board grounding pattern. 4...Earth metal fittings. 5... Printed board. 6...Earth pattern. 7... Mounting hole for printed board. 8... Chassis metal fittings. Akira! Kuchi Atsushi 211i0 Shima 5me 4th

Claims (1)

[Claims] A grounding fitting made of an elastic conductive plate bent into an approximately W shape, in which a fitting shaped part provided at the center protrusion is fitted into a hole provided on a printed circuit board, and the protrusions provided at both ends are connected to the printed board. A grounding metal fitting for a printed board, characterized in that the protrusion in the opposite direction is brought into contact with a grounding pattern formed on the printed board, and a protrusion in the opposite direction is in contact with a mounting metal plate surface facing the printed board at a predetermined distance.