JPH0143913Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a shield cover structure for high frequency equipment such as television channels and CATV converters.

[Background of the idea]

Part 3 about this type of conventional shield cover structure
This will be explained based on FIG.

FIG. 3 shows a partial plan view of the shield cover (inner cover) 1, and FIG. 4 shows an external perspective view of the shield cover 1 attached to the main body frame (casing) 8.

A square hole 4 for caulking is provided in the shield cover 1 in correspondence with the arrangement of the small chambers in the main body frame 8.

The main body frame 8 is provided with a shield plate 9 that partitions each chamber, and a caulking pawl 5 is formed protruding from the tip of each shield plate 9. A rectangular crimping hole 4 shown in FIG. 3 is inserted into the crimping claw 5, and the upper part of the main body frame 8 is covered with the shield cover 1, and the main body cover 6 is further placed on top of the main body frame 8. Then, when the caulking claw portion 5 is twisted, the main body cover 6 is pressed downward.

At this time, the shield cover 1 is pressed downward by the protrusion (bulging part) 7 of the main body cover, and the shield cover 1 is brought into close contact with the end surfaces of the main body frame 8 and the shield plate 9.

Incidentally, the main body cover (outer cover) 6 is also naturally provided with a groove into which the caulking claw portion 5 is fitted.

In this shield cover structure for high frequency equipment, the protrusion 7 of the conductive main body cover 6 is pressed against the shield cover 1 made of an elastic conductive thin plate placed so as to cover the open surface of the main body frame 8. As a result, the shield cover pushed by the protrusion 7 of the main body cover 6 is elastically deformed and reliably contacts (grounds at high frequency) the upper surfaces of the main body frame 8 and the shield frame 9, but this conventional example There are also the following drawbacks.

This means that as the adjacent pitch of the shield plates 9 becomes smaller, the adhesion deteriorates.

That is, when the crimping claw part 5 is twisted, the shield cover 1 is pressed and deformed by the protruding part 7 of the main body cover, and comes into close contact with the main body frame 8 and the shield plate 9, but the adjacent pitch of the crimping claw part 5 is small. Since the shield cover 1 is difficult to bend, it cannot be caulked and a complete shielding effect cannot be obtained.

For this reason, it cannot be used for miniaturized products. If such a structure is dared to be used for a small item, a strong crimping jig is required, and in order to sufficiently crimp it, the main body frame must be strong enough to withstand this crimping jig.

[Purpose of invention]

This invention basically adopts the conventional shield cover structure described above, but eliminates the drawbacks mentioned above, improves the shielding performance of each chamber divided by shield plates, and creates a smaller container (main body frame). ) The purpose of this invention is to provide a shield cover structure that can accommodate the following.

[Summary of the idea]

In order to achieve the above object, the present invention provides an inner cover made of an elastic conductive thin plate with a rectangular hole facing the small chamber of the casing, and slits extending outward at the four corners of this hole. By doing so, the inner cover is made to have a flexible structure.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Note that the same parts as in the conventional example are given the same reference numerals.

FIG. 1 is a plan view showing a shield cover 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view of a main body frame 8 incorporating this shield cover 1.

In the present invention, in addition to the rectangular caulking hole 4, the shield cover 1 is provided with a cutout consisting of a rectangular hole 3 and slits 2 radially formed at its four corners.

The body frame 8 and the shield plate 9 that partitions each chamber each have a caulking claw part 5, and a square caulking hole part 4 shown in FIG.

Then, by twisting the caulking claw, the main body cover 6 is pressed downward. As a result, the shield cover 1 is pressed by the protrusion 7 of the main body cover 6, and the shield cover 1 is brought into close contact with the main body frame 8 and the shield plate 9.

At this time, if the square hole part 3 and the slit part 2 shown in FIG. The shield plate 9 is in close contact with the main body frame 8, and a good shielding effect can be obtained.

In other words, due to the presence of the cutout section formed by the hole section 3 and the slit section 2, the force when twisting the caulking claw section 5 is absorbed here, so that the shield cover 1 easily bends. It is.

[Effect of idea]

As described above, the present invention provides a cutout consisting of a hole and a slit in the inner cover to make the inner cover more flexible, so when attaching the outer cover to the casing, the inner cover is securely attached to the end face of the casing. It can be brought into close contact with the surrounding area and a good shielding effect can be obtained. Therefore, even if a shield plate with a very small thickness is applied, the effect is particularly large when the shield plates do not come into close contact or when the adjacent pitch between the shield plates is small. Furthermore, since the adjacent pitch of the shield plates can be made smaller, each chamber can be made smaller, and the entire structure can be made smaller.

[Brief explanation of the drawing]

1 and 2 relate to a shield plate structure according to an embodiment of the present invention, in which FIG. 1 is a plan view of the shield plate, FIG. 2 is a partially sectional external view of the overall structure, and FIG.
4 and 4 relate to a conventional shield plate structure, FIG. 3 is a plan view of the shield plate, and FIG. 4 is a partially sectional external view of the entire structure. 1...Inner cover, 2, 3...Cutout portion, 6...Outer cover, 7...Bulging portion, 8...Housing.

Claims (1)

[Scope of utility model registration request] A conductive casing with a built-in high-frequency circuit and a plurality of small chambers; an inner cover made of an elastic conductive thin plate placed on the open surface of the casing; and a conductive outer cover having a bulge protruding in the direction of the small chamber within the casing, and the inner cover is pressed by the bulge of the outer cover to bring the inner cover into pressure contact with the end surface of the casing. A shield cover structure for high frequency equipment, characterized in that a rectangular hole is provided at a position facing the small chamber of the inner cover, and slits extending outward are formed at the four corners of the hole. cover structure.