JPH01204499A - Ground connecting structure for plastic cover - Google Patents

Abstract

PURPOSE:To electrically integrate a coating face with a body device by engaging fixedly terminal fitting with the terminal mounting lug of a surface to be coated, forming a conductive coating film on the surface to be coated, and further connecting the fittings by leads to the ground potential member of the device. CONSTITUTION:A lug 12 for mounting a terminal is provided on a plastic cover 11 covering a body of a device 10. After a terminal fitting 13 having a mounting hole 13a is engaged fixedly with the lug 12, the surface of the cover 11 to be coated including the stationary part of the fitting 13 is coated with conductive paint thereby to form a conductive coating film 14. Further, the fittings 13 are connected by a lead wire 15 to a grounding member 16 of the device 10. Thus, the coating face is electrically integrated with the device.

Description

[Detailed Description of the Invention] [Summary] Regarding the ground connection structure of a plastic cover coated with a conductive coating in electronic equipment, it is possible to attach a lead wire to the painted surface and connect the painted surface to the main device electrically. In electronic equipment that has a plastic cover that is coated with a conductive coating and that is grounded, terminal fittings with mounting holes are pre-installed on the surface of the plastic cover that is to be painted. The terminal fitting is fitted and fixed to the terminal mounting protrusion, a conductive coating film is formed on the surface to be painted including the terminal fitting, and the terminal fitting is further connected to an earth potential member of the main device by a lead wire. .

[Industrial Field of Application] The present invention relates to a ground connection structure for a plastic cover coated with a conductive coating in electronic equipment.

[Conventional technology]

In recent years, countermeasures against radio noise have been required for electronic devices. For this reason, when the cover that covers the main body of the electronic device is made of plastic, a conductive coating film 2 having metal-like properties is formed on the inner surface of the plastic cover 1 as shown in FIG. The coating film is brought into contact with a metal part of the main device 3 and fastened with a mounting screw 4, and the conductive coating film 2 is electrically connected to the main device 3 which is at ground potential, thereby achieving electrical integration.

[Problems to be Solved by the Invention] In the conventional method described above, ideal contact cannot be obtained due to excessive or insufficient tightening force of the screw, warpage of the cover, etc.

For this reason, it is conceivable to connect the main unit to the main unit using lead wires from the painted surface, regardless of the tightening force of the screws or the warpage of the cover, etc. However, since the conductive coating is a resin paint, the lead wires, etc. can be directly soldered. The problem is that it cannot be attached.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a ground connection structure for a plastic cover that allows lead wires to be attached to a painted surface and electrically integrated with the main device.

[Means for solving problems]

The above-mentioned purpose is to provide a terminal mounting device in which a terminal fitting 13 having a mounting hole 13a is provided in advance on a surface to be painted of a plastic cover 11 in an electronic device having a plastic cover on which a conductive coating film is applied and the coating film is grounded. protrusion 12
A conductive coating film 14 is formed on the surface to be painted including the terminal fitting 13, and the terminal fitting 13 is further connected to the earth potential member 16 of the main device 10 by a lead wire 15. This is achieved by a plastic cover earth connection structure featuring:

[Function] A terminal mounting protrusion 12 is provided in advance on the plastic cover 11, a terminal fitting 13 is fixed by the protrusion, and a conductive coating film 14 is applied to the surface to be painted, including the terminal fitting, thereby making it conductive. By establishing an electrical connection between the adhesive coating film 14 and the terminal fitting 13, and connecting the terminal fitting 13 to the earth potential member 16 of the main device 10 via the lead wire 15, reliable grounding becomes possible.

〔Example〕

FIG. 1 is a diagram showing a first embodiment of the present invention.

As shown in the figure, in this embodiment, a protrusion 12 for attaching a terminal is provided on a plastic cover 11 that covers the main device 10, and a terminal fitting 13 having an attachment hole 13a is fitted into the protrusion 12, and is thermally caulked. After fixing, a conductive paint is applied to the surface to be painted (inner surface of the cover) of the plastic cover 11 including the fixing portion of the terminal fitting 13 to form a conductive coating film 14, and the terminal fitting 13 is connected to the lead wire 15. Main device 1
It is configured to be connected to the ground potential member 16 of 0.

In this embodiment configured as described above, the terminal fitting 13 is fixedly attached to the cover 11, and the conductive paint is applied thereon, so that the electrical connection between the conductive coating film 14 and the terminal fitting 13 is established. This is good because it is not affected by distortion of the cover, etc., and the terminal fitting 13 is connected to the main device 10 via the lead wire 15.
By connecting it to the ground potential member 16, a good shielding effect against radio noise can be obtained.

FIG. 2 is a diagram showing essential parts of a second embodiment of the present invention.

In this figure, the same parts as in FIG. 1 are designated by the same reference numerals.

In this embodiment, as shown in the figure, a plastic cover 11
The terminal fitting mounting protrusion 12 is tapered so as to become thinner from the tip to the base, and the tip is chamfered, and the mounting hole 13a of the terminal fitting 13 has a diameter that is approximately the same as the thickness of the base of the protrusion 12. , the terminal fitting 13 is attached to the protrusion 12
After that, a conductive coating film 14 is applied, and the terminal fitting 13 is connected to the earth potential member of the main device by a lead wire.

The present embodiment configured in this manner not only has a good shielding effect against radio wave noise as in the previous embodiment, but also has the advantage that no thermal crimping work is required to attach and fix the terminal fitting 13, reducing assembly man-hours. There is.

FIG. 3 is a diagram showing essential parts of a third embodiment of the present invention.

In this figure, the same parts as in FIG. 1 are designated by the same reference numerals.

As shown in the figure, in this embodiment, a recess 17 having an inner diameter and depth equal to the outer diameter and thickness of the mounting portion of the terminal fitting 13 is formed around the terminal fitting mounting protrusion 12 of the plastic cover 11.
After forming a terminal fitting 13 on the protrusion 12, a conductive coating 14 was applied to the inner surface of the cover 11, and the terminal fitting 13 was connected to a ground potential member of the main device by a lead wire. It is something.

This embodiment configured in this manner not only has a good shielding effect against radio wave noise similar to the first embodiment, but also has the advantage that the top surface of the terminal fitting 13 and the surface of the plastic cover are on the same plane, so that there is no difference in level. It is possible to prevent the conductive coating from becoming thinner at stepped portions and from causing coating breakage.

FIG. 4 is a diagram showing essential parts of a fourth embodiment of the present invention.

In this figure, the same parts as in FIG. 1 are designated by the same reference numerals.

In this embodiment, the outer periphery of the mounting portion of the terminal fitting 13 has a taper.
3b, and after attaching and fixing the terminal fitting 13 with the terminal fitting mounting protrusion 12 of the plastic cover, remove the cover.
A conductive coating film 14 is applied to the inner surface of 11, and the terminal fitting 1
3 is connected to the earth potential member of the main device by a lead wire.

In this embodiment configured in this way, since there is no step difference between the terminal fitting 13 and the plastic cover 11, a good shielding effect can be obtained without causing defects such as paint film breakage, as in the previous embodiment. .

FIG. 5 is a diagram showing a fifth embodiment of the present invention.

In this embodiment, as shown in the figure, the lead wire 15 is connected in advance by soldering or the like before the terminal fitting 13 is attached to the plastic cover, and the core part is masked when applying conductive paint. This makes it possible to save man-hours as there is no need to do this.

〔Effect of the invention〕

As explained above, according to the present invention, a good electrical connection between the two can be obtained by attaching the terminal fitting to the surface to be coated with the conductive coating of the plastic cover and painting the conductive coating over it. This also improves the shielding effect against radio noise.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the invention, FIG. 2 is a diagram showing a second embodiment of the invention, FIG. 3 is a diagram showing a third embodiment of the invention, and FIG. 4 is a diagram showing a third embodiment of the invention. FIG. 5 shows a fourth embodiment of the invention, FIG. 5 shows a fifth embodiment of the invention, and FIG. 6 shows a conventional ground connection structure for a plastic cover. In the figure, 10 is the main body of the device, 11 is a plastic cover, 12 is a projection for attaching a terminal fitting, 13 is a terminal fitting, 14 is a conductive coating, 15 is a lead wire, and 16 is an earth potential member.

Claims (3)

[Claims] 1. In an electronic device having a plastic cover on which a conductive coating is applied and the coating is grounded, a terminal fitting (13) having a mounting hole (13a) is provided in advance on the surface to be painted of the plastic cover (11). Fitted and fixed to the terminal mounting protrusion (12), the terminal fitting (13)
), a conductive coating film (14) is formed on the surface to be painted, and the terminal fitting (13) is further connected to the earth potential member (16) of the main device (10) by a lead wire (15). A plastic cover earth connection structure characterized by: 2. Claim 1: A recess (17) having an inner diameter and depth equal to the outer diameter and thickness of the terminal fitting (13) is provided around the terminal mounting protrusion (12) of the plastic cover (11). Earth connection structure of the plastic cover described in section. 3. The earth connection structure for a plastic cover according to claim 1, wherein a slope (13b) is provided on the outer periphery of the terminal fitting (13).