JP2516196Y2 - Circuit device cover contact structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cover contact structure for a circuit device, and more particularly, a shield plate provided so as to partition the case body at each stage of the circuit in the case body of the circuit device. And a cover for covering the circuit device.

[Prior Art] Generally, in a circuit device such as a booster for a video signal, the circuit device includes a high-frequency circuit, and therefore, it is necessary to provide a shield plate on the component side of the circuit board. The shield plate is provided perpendicularly to the circuit board because it is divided into stages of the circuit. The shield plate is brought into contact with the cover that covers the case body and is grounded. Usually, as shown in FIG. 6, a cover 4 is provided with a section 4a by a U-shaped cut and bent downward, and the tip of this section 4a is provided on the upper end of the shield plate 3 installed in the case body 2. It was realized by contacting the protrusion 3a.

However, this contact structure has a problem that a difference occurs between the potential at the tip of the section and the potential at the edge of the hole in which the section is formed, which corresponds to the tip of the section.

Therefore, the applicant of the present invention has proposed a fair structure as a structure in which the shield plate is brought into contact with the cover without causing a potential difference.
The one shown in Japanese Patent No. 29826 was devised.

As shown in FIGS. 4 and 5, a part of the cover 4 is notched and protruded downward so as to protrude.
There is disclosed a structure in which 4a is formed and a protrusion 3a provided on the upper end of the shield plate 3 is brought into contact with the protrusion 4a.

[Problems to be solved by the invention] However, since the above-mentioned protrusion 4a has a small spring property, if the cover is removed and the cover is attached again during repair or maintenance work, the protrusion of the cover and the protrusion of the shield plate In some cases, poor contact occurred.

In addition, the cover and the shield plate may be deformed during re-installation.

SUMMARY OF THE INVENTION Therefore, a technical object of the present invention is to provide a cover contact structure for a circuit device in which a contact failure does not occur between the cover and the shield plate and the potential of the cover can be made uniform.

[Means for Solving the Problems] According to the present invention, in a circuit device having a case body having an opening on at least one surface, a shield plate for partitioning the case body, and a cover for covering the opening of the case body, the cover is provided. A pair of sections formed by cutting an H-shaped cut into the inside of the case are cut and raised inside the case, and the upper and lower ends of the shield plate are adjacent to each other so as to contact with the tips of the pair of cut and raised portions. A cover contact structure for a circuit device is obtained, characterized in that a pair of protrusions is formed on the cover contact structure.

[Operation] The pair of segments formed by the H-shaped notch act as a cantilever spring by cutting and raising.

As a result, even if the cover is repeatedly attached and detached, the cut-and-raised portion always acts on the projection of the shield plate due to its spring property.

As a result, no extra stress is applied to the cover and the shield plate, and the pair of cut and raised portions of the cover are reliably connected to the adjacent protrusions of the shield plate. This means that a potential difference is unlikely to occur in the hole in which the pair of cut and raised portions are formed.

[Embodiment] Hereinafter, a cover contact structure of a circuit device according to an embodiment of the present invention will be described with reference to the drawings.

Referring to FIGS. 1 and 2, a circuit device having a contact structure of a cover of the circuit device according to the present invention includes a case body 20 for accommodating a circuit board (not shown), and a case body 20 disposed vertically to the circuit board. A pair of pieces that are attached to each other and cover the circuit board and a shield plate 30 having a pair of protrusions 30a and 30b at the upper end in a state of being adjacent to each other and formed by making an H-shaped cut And a cover 40 having cut-and-raised portions 40a and 40b formed by cutting and raising.

Here, in order to simplify the explanation, one shield plate is shown and two pairs of projections 30a and 30b are shown. However, a plurality of shield plates are usually provided, and a pair of projections is provided for each of them. Needless to say, the cover 40 is provided with a pair of cut-and-raised parts at positions corresponding to the protrusions of the shield plate. The cut-and-raised parts 40a and 40b are formed by cutting the cover 40 into an H-shape and applying a force to the pair of sections in the same direction, that is, toward the inside of the case body 20, and have spring properties. ing.

As shown in FIG. 3, the cover 40 covers the case body 20.
When attached to the cut-and-raised parts 40a, 40b, the tips of the cut-and-raised parts 40a, 40b abut the projections 30a, 30b, respectively, so that the cut-and-raised parts 40a, 40b and the abutting ends 30a, 30b are reliably connected,
The shield plate 30 is grounded to the cover 40.

[Effects of the Invention] As described above, according to the present invention, the pair of cut-and-raised portions formed by the H-shaped cuts have the spring property, and the cover is repeatedly attached and detached from the case body. In addition, it is possible to prevent not only poor contact between the cut-and-raised part of the cover and the projection of the shield plate, but also the deformation of the cover and the shield plate.

Also, since the pair of cut-and-raised parts of the cover are connected to the pair of adjacent protrusions on the shield plate, the potentials of the root portions of the pair of cut-and-raised parts of the cover are the same, and the potential difference is generated in the cover. There is also the effect of not causing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an essential part of a circuit device according to an embodiment of the present invention upside down, FIG. 2 is a view partially showing a cover of the circuit device of FIG. 1, and FIG. FIG. 4 is a view showing a sectional view taken along the line BB in FIG. 2, FIG. 4 is a view partially showing an example of a conventional cover, FIG. 5 is a view showing the sectional view taken along the line AA in FIG. 4, and FIG. The figure is a cross-sectional view of another main part of a conventional circuit device. 1 ... Circuit device, 2 ... Case body, 3 ... Shield plate,
4 ... Cover, 30 ... Shield plate, 30a ... Protrusion, 40 ...
… Cover, 40a… Cut and raised part.

Claims (1)

(57) [Scope of utility model registration request] 1. A circuit device having a case body having an opening on at least one surface, a shield plate for partitioning the case body, and a cover for covering the opening of the case body, wherein an H-shaped cut is formed in the cover. A pair of the cut pieces are cut and raised inside the case, and a pair of protrusions are formed at positions adjacent to each other on the upper end of the shield plate so as to come into contact with the tips of the pair of cut and raised portions. The cover contact structure of the characteristic circuit device.