JPS6111894Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiring device in an electronic device cabinet that is most suitable for application to electronic devices such as radio receivers and tape recorders.

Conventionally, in electronic equipment such as radio receivers and tape recorders, for example, metal panels adhered to the surface of a cabinet structure made of synthetic resin, and a ground pattern of a printed circuit board housed inside the cabinet structure, etc. There is a wiring device in an electronic device cabinet that uses lead wires to establish electrical continuity with a predetermined pattern.

However, in recent years, with the miniaturization of electronic devices, the accumulation rate of various components inside the cabinet has become extremely high.Therefore, there is not enough space for wiring the lead wires, and the lead wires must be routed in a very narrow space. Since wires had to be routed and wired, wiring work for the lead wires was difficult. In addition, it is necessary to use long lead wires in consideration of assembling and dividing the printed circuit board, but since there is not enough wiring space, the lead wires are easily caught on other parts and disconnected easily. The assembly and disassembly work was also troublesome. Furthermore, there is a risk of being shot if the lead wire is accidentally caught on another component and its coating is peeled off, resulting in a lack of safety.

The present invention makes it possible to extremely easily and safely establish electrical continuity between the metal panel on the surface of the cabinet structure and the predetermined pattern of the printed circuit board housed inside the cabinet structure without using lead wires. It is something.

That is, the present invention provides the above-mentioned wiring device for an electronic device cabinet, in which a cylindrical body is integrally formed inside the cabinet structure, and an opening is formed on the back surface of the metal panel on the surface of the cabinet structure. the opening and the hollow part inside the cylindrical body communicate with each other, a coiled metal spring is housed in the hollow part inside the cylindrical body, and one end of the metal spring is inserted through the opening. The printed circuit board housed inside the cabinet structure is screwed to the tip of the cylindrical body using a metal screw, and at this time, a screw shaft having a smaller diameter than the head of the metal screw is By inserting a portion into the hollow portion and pressing the other end of the metal spring, the metal panel and the predetermined pattern of the printed circuit board are electrically connected through at least the metal screw and the metal spring.

Therefore, according to the present invention, it is sufficient to simply screw the printed circuit board to the tip of the cylindrical body using metal screws, and there is no need to perform the wiring work of lead wires, which is a difficult work as in the past. This makes it extremely easy to establish electrical continuity between the metal panel and the predetermined pattern on the printed circuit board. In particular, since no lead wires are used, there is no risk of wire breakage, and in particular, since the metal spring is housed in a hollow space inside the cylindrical body made of synthetic resin, the metal spring can be used as a component of the cabinet. There is no risk of accidental contact with other internal parts and the risk of being shot, making it extremely safe.

An embodiment in which the present invention is applied to electronic equipment such as a radio receiver will be described below with reference to FIG.

Reference numeral 1 denotes a synthetic resin cabinet main body which is a cabinet component, and 2 a synthetic resin back cover which is also a cabinet component. Note that a metal panel 3 such as a thin aluminum plate is adhered to the surface of the cabinet body 1 with an adhesive sheet 4 or the like.
Reference numeral 5 designates a plurality of cylindrical bodies integrally formed inside the cabinet body 1, which are substantially cylindrical in shape, with a hollow part 6 formed inside, and a screw insertion hole at the tip. 7 is molded. 8 is a printed circuit board to which many electronic components 9 are soldered. Reference numeral 10 denotes a plurality of metal screws composed of self-tapping screws, with a screw shaft portion 10a.
has a smaller diameter than the head 10b.

Note that the screw shaft portion 10a of the metal screw 10 inserted into the screw insertion hole 11 provided in the back cover 2 is inserted through the screw insertion hole 12 provided in the printed circuit board 8, and the screw shaft portion 10a of the metal screw 10 is inserted into the screw insertion hole 7 of each cylindrical body 5. The back cover 2 and the printed circuit board 8 are fixed to the cabinet body 1 in a co-tight state.

In addition, in such an electronic device, if you touch the metal panel 3 with your finger while the back cover 2 of the cabinet body 1 is placed on a metal table etc., the static electricity will be transferred to the metal because the human body is charged. There is a risk that the liquid will flow from the panel 3 to the electronic components 9 of the printed circuit board 8 inside, and destroy ICs, LSIs, etc. with low voltage resistance among the electronic components 8.

Therefore, in this embodiment, the above-mentioned electrostatic IC,
In order to prevent destruction of the LSI etc., the metal panel 3 and a ground pattern 16, which is a predetermined pattern formed on the printed circuit board 8, are electrically connected.

That is, first, a plurality of openings 13 are provided on the back surface of the metal panel 3 on the surface of the cabinet body 1, and each opening 13 corresponds to the hollow part 6 of each cylindrical body 5.
3 and each hollow part are communicated with each other. Next, a coiled metal spring 14 is housed in the hollow part 6 of each cylindrical body 5, and one end 14b of the metal spring 14 is inserted through the opening 13 and connected to the back surface of the metal panel 3. There is. and each metal screw 1
0 tightening, the tips of the threaded shaft portions 10a of these metal screws 10 are pressed (crimped) to the other ends 14a of each metal spring 14, and by compressing each metal spring 14, the one end 14b is attached to the metal panel. It is pressed (crimped) to the back of 3. Therefore, the metal panel 3 and the metal screw 10 are electrically connected via the metal spring 14. Furthermore, metal washers 15 are fitted to each metal screw 10 between the back cover 2 and the printed circuit board 8, and by tightening each metal screw 10, these metal washers 15 are formed on the printed circuit board 8. The ground pattern 16 is crimped to the ground pattern 16 through the metal washer 15.
and the metal screw 10 are electrically connected.

As described above, the metal panel 3 and the ground pattern 16
and at least 10 metal screws and 1 metal spring
4, it is possible to prevent ICs, LSIs, etc. from being destroyed by static electricity as described above.

Furthermore, the metal spring 14 is housed in the cylindrical body 5, and the back cover 2 and the printed circuit board 8 are fastened together to the cylindrical body 5 using the metal screws 10. Since electrical connections are made, wiring is significantly simplified. Further, since the metal spring 14 does not jump out of the cylindrical body 5, there is no risk of the metal spring 14 accidentally coming into contact with other parts and being shot. In addition, if you try to make the above connection using lead wires, you will need to perform troublesome work such as routing the lead wires within the cabinet body 1 and soldering both ends of the lead wires. do not have. Furthermore, although the electrical connection is made by tightening the metal screws 10, this does not cause any trouble in disassembling the back cover 2 and the printed circuit board 8, which is very convenient during service.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the back cover 2 and the printed circuit board 8 are attached to the cylindrical body 5 using a metal screw 10, but the back cover 2 is attached to the cabinet body 1 using a separate screw. Attachment: Only the printed circuit board 8 can be attached to the cylindrical body 5 with the metal screws 10. In that case, the head 10b of the metal screw 10 is brought into direct contact with the ground pattern 16 of the printed circuit board 8. , the metal washer 15 can be omitted.

This invention makes it extremely easy to connect the metal panel on the surface of the cabinet structure to a predetermined pattern on the printed circuit board by simply screwing the printed circuit board to the tip of the cylindrical body inside the cabinet structure, without using lead wires. It is possible to conduct electricity, and there is no risk of lead wire breakage or shorts, making it extremely safe. And since no lead wires are used,
Assembling and disassembling printed circuit boards can be performed extremely easily, and productivity and serviceability can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 1... Cabinet body (cabinet structure) 3... Metal panel, 5... Cylindrical body, 6... Hollow part, 8...
Printed circuit board, 10...metal screw, 10a...screw shaft, 10b...head, 14...metal spring, 16...earth pattern (predetermined pattern),
It is.

Claims (1)

[Scope of Utility Model Registration Claim] A metal panel in an electronic device cabinet that conducts electrically between a metal panel adhered to the surface of a synthetic resin cabinet structure and a predetermined pattern of a printed circuit board housed inside the cabinet structure. In the wiring device, a cylindrical body is integrally molded and provided inside the cabinet structure, and an opening is provided on the back surface of the metal panel on the surface of the cabinet structure, and the opening and the inside of the cylindrical body are connected to each other. A coiled metal spring is housed in the hollow part of the cylindrical body, and one end of the metal spring is inserted through the opening and comes into contact with the back surface of the metal panel. The printed circuit board housed inside the structure is screwed to the tip of the cylindrical body using a metal screw, and at that time, a screw shaft portion having a smaller diameter than the head of the metal screw is inserted into the hollow portion to tighten the metal spring. A wiring device for an electronic equipment cabinet, characterized in that the metal panel and the predetermined pattern of the printed circuit board are electrically connected to each other via at least a metal screw and a metal spring by pressing the other end.