JP2524037Y2 - Grounding device for shield substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a shield substrate grounding device for shielding an electric circuit element, and more particularly, to a shield substrate provided with a switch device and a flexible printed circuit board. It relates to a grounding device.

[Conventional technology]

Conventionally, a metal plate is used to shield an electric circuit element used for a focus position detecting device that handles a weak current or an exposure control device of a camera, etc., in order to guide the electric potential of the metal plate to the ground. Connection to the ground by means of lead wires or solder bridges.

[Problems to be solved by the invention]

However, in the above-mentioned conventional shield device, it is necessary to provide a lead wire or to perform a soldering operation in order to lead the potential of the metal plate which acts as a shield to the ground. Therefore, not only does the cost of the product increase due to an increase in the number of assembling steps, but also there is a risk that reliability may be reduced due to a defective soldering operation or the like.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional device, and to provide a highly reliable shield substrate grounding device which is easy to assemble.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, a flexible printed board having at least a switch pattern and a ground land pattern, and a metal made of metal that holds the flexible printed board and shields the electric circuit element A shield substrate, a flat portion, a cup-shaped portion protruding from the flat portion and holding a switch contact facing the switch pattern, and a push button provided at one end of the cup-shaped portion are integrally formed of elastic rubber. Holding the switch member, a plate-shaped conductive elastic body provided on a plane portion thereof so as to contact both the ground land pattern and the shield substrate, and a button hole through which the push button penetrates, and holds the switch member. And a switch holding plate fixedly mounted on the shield substrate via a flexible printed circuit board. In order to solve the above-mentioned problem, the switch holding plate is configured to sandwich the flat portion of the switch member between the shield substrate and the shield member so as to be connected to the ground land pattern of the flexible printed board via the conductive elastic body. Means for this purpose.

The flexible printed circuit board is provided with an opening where a part of the shield substrate is exposed adjacent to the ground land pattern, and a part of the plate-shaped conductive elastic body that contacts the ground land pattern is shielded through the opening. It is desirable to configure so as to be in contact with the substrate.

[Action]

In the grounding device for a shield board configured as described above, the flexible printed board is provided on the shield board, and the switch member has the switch contact point opposed to the switch pattern of the flexible printed board and fixed to a flat portion. The plate-shaped conductive elastic body is placed on the shield substrate so as to contact both the ground land pattern of the flexible printed board and the shield substrate. The switch holding plate is fixed on the shield substrate so that the flexible printed substrate and the flat portion of the switch member are sandwiched between the shield substrate. At that time, the push button of the switch member is exposed to the outside through the opening, and the flat portion is compressed so that the plate-shaped conductive elastic body contacts both the ground land pattern of the flexible printed board and the shield substrate. It is placed on a shield substrate. The switch holding plate is fixed on the shield substrate so that the flexible printed substrate and the flat portion of the switch member are sandwiched between the shield substrate. At that time, the push button of the switch member is exposed to the outside through the opening, and the flat portion is compressed so that the plate-shaped conductive elastic body contacts both the ground land pattern of the flexible printed board and the shield substrate. Since they are strongly pressed, they are connected via a plate-shaped conductive elastic body. Thereby, the shield substrate is reliably grounded via the plate-shaped conductive elastic body and the ground land pattern.

On the other hand, when the push button is pushed, the cup-shaped portion is elastically deformed, the switch contact comes into contact with the switch pattern on the flexible printed circuit board, and when the operation is released,
The cup-shaped portion is restored to release the switch contact from the switch pattern. As a result, the switch is opened and closed.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the configuration of the embodiment of FIG. 1, excluding a cover.

In FIGS. 1 and 2, the shield substrate 1 is formed of a metal plate or a metal case so as to shield electric circuit elements 2a and 2b that handle a weak current. It is arranged so as to cover the circuit board 3 on which 2b is mounted. The flexible printed board 4 is provided on the shield board 1, is sandwiched between a switch holding plate 6 for holding the switch member 5, and the shield board 1, and is fastened and fixed by small screws 7. The flexible printed board 4 has a switch pattern 8 and a ground land pattern (GND pattern) 9 as shown in FIG. An opening 10 is formed.

The switch member 5 has a flat portion having an extended portion 5a in a part thereof.
5A and a switch contact 11 protruding from the flat portion 5A and facing the switch pattern 8 of the flexible printed circuit board 4.
And a push button 5C provided at one end of the cup-shaped portion 5B, and are integrally formed of elastic rubber. Also, the flat land portion 5A has a ground land pattern 9 of the flexible printed circuit board 4 and an opening adjacent thereto.
A plate-like conductive elastic body 12 such as carbon rubber is provided at a portion facing the base 10.

On the other hand, the switch holding plate 6 is a push button of the switch member 5.
It has a button hole 6A through which 5C penetrates, a groove portion 6B into which the flat portion 5A and the cup-shaped portion 5B are inserted, and a depth of a groove to a pressing pressure bottom surface 6a of a portion where the extension portion 5a of the flat portion 5A is inserted. The thickness is smaller than the sum of the thickness of the extended portion 5a of the switch member 5 and the thickness of the plate-shaped conductive elastic body 12. Thereby, when the switch holding plate 6 is tightened and fixed to the shield substrate 1 by the small screw 7,
A part of the plate-shaped conductive elastic body 12 is pressed into contact with the ground land pattern 9 of the flexible printed board 4, and the other part is pressed into contact with the shield substrate 1 through the opening 10 of the flexible printed board 4, and is grounded. The land pattern 9 and the shield substrate 1 are configured to be electrically connected.

In addition, the push button 5C which penetrated the button hole 6A of the switch holding plate 6
Is configured to be exposed to the outside through an opening 13A provided in a cover 13 that covers the upper surface of the switch holding plate 6.

Since the embodiment of FIG. 1 is configured as described above, after inserting the flat portion 5A of the switch member 5 into the groove 6B of the switch holding plate 6 so that the push button 5C is inserted into the button hole 6A, When the switch holding plate 6 is placed on the flexible printed circuit board 4 on the shield substrate 1 and fastened and fixed with small screws 7, the extended portion 5 a of the switch member 5 is compressed by the pressing bottom surface 6 a of the switch holding plate 6. This allows
A part of the plate-like conductive elastic body 12 is pressed into contact with the ground land pattern 9 of the flexible printed board 4, and the other part is pressed into contact with the shield substrate 1 through the opening 10 of the flexible printed board 4, and is flexible. The ground land pattern 9 of the printed board 4 and the shield board 1 are electrically connected. Therefore, the shield substrate 1 is grounded via the plate-shaped conductive elastic body 12 and the ground land pattern 9, and the potential of the shield substrate 1 can be guided to the ground through the ground land pattern 9.

When the push button 5C is pressed, the switch member 5 is pressed.
The cup-shaped portion 5B is elastically deformed to bring the switch contact 11 into contact with the switch pattern 8 of the flexible printed circuit board 4. Thus, the switching device is opened and closed. In this case, by providing the switch pattern 8, the ground land pattern 9 and the opening 10 of the flexible printed board 4 close to each other, the switch member 5 can be formed in a small size.

In the embodiment shown in FIGS. 1 and 2, the shield substrate 1 is constituted by a flat plate, but the electric circuit elements 2a, 2b
Is formed in a box-shaped case having a flat top surface surrounding the case, the shielding effect can be further enhanced.

[Effect of the invention]

As described above, according to the present invention, since the shield substrate is made of a rigid metal, it can directly withstand the pressing force of the switch provided on the upper portion, and the plate-shaped conductive elastic body is provided between the shield substrate and the switch. The electric connection between the shield substrate and the ground land pattern on the flexible printed circuit board can be performed only by sandwiching the shield substrate, so that an unnecessary increase in the number of parts and a troublesome work of processing the parts can be suppressed. Further, since the plate-shaped conductive elastic body is in contact with the shield substrate and the ground land pattern on the same surface, the plate-like conductive elastic body can be sandwiched as it is without any processing, and it is possible to suppress troublesome work of processing parts.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 2 is an exploded perspective view excluding a cover for explaining the configuration of the embodiment shown in FIG. (Explanation of reference numerals of main parts) 1 ... Shield substrate 2a, 2b ... Electrical circuit element 4 ... Flexible printed circuit board 5 ... Switch member 5A ... Flat portion 5B ... Cup portion 5C ... Push button 6 ... ... switch holding plate 6A ... button hole 8 ... switch pattern 9 ... ground land pattern 10 ... opening 11 ... switch contact 12 ... plate-shaped conductive elastic body

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshio Imura 1-6-3 Nishioi, Shinagawa-ku, Tokyo Inside Nikon Oi Works Co., Ltd. (72) Inventor Noboru Akami 1-3-6 Nishioi, Shinagawa-ku, Tokyo No. Nikon Oi Works Co., Ltd. (56) References Japanese Utility Model sho 59-9593 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] A flexible printed circuit board having at least a switch pattern and a ground land pattern; a rigid metal shield board for holding the flexible printed circuit board and shielding against an electric circuit element; A switch member in which a cup-shaped portion projecting from a flat portion and holding a switch contact facing the switch pattern and a push button provided at one end of the cup-shaped portion are integrally formed of elastic rubber; And a plate-shaped conductive elastic body provided on the flat portion so as to be in contact with the ground land pattern on the same surface; and an opening through which the push button passes and holding the switch member and the flexible print. A switch holding plate fixed on the shield substrate via a substrate, wherein the shield substrate is The holding plate is configured so as to sandwich the flat portion of the switch member between the shield substrate and the shield substrate so as to be connected to the ground land pattern of the flexible printed board via a conductive elastic body. Grounding device for shield substrate. 2. The flexible printed circuit board has an opening provided adjacent to the ground land pattern, and a part of the plate-shaped conductive elastic body contacting the ground land pattern is formed on the flexible printed circuit board. 2. The grounding device for a shield substrate according to claim 1, wherein the device is configured to come into contact with the shield substrate through an opening.