JPH02229496A - Electronic apparatus case - Google Patents

Abstract

PURPOSE:To enable easy covering operation of a shield lid by making a distance between a pair of contact pieces of the shield lid smaller than that between inner surfaces of a pair of sidewalls of a base frame. CONSTITUTION:An electronic circuit 6 is mounted inside a base frame 3. A shield lid 8 is attached covering an opening section 3a of the base frame 3. In this case, a distance between both contact pieces 10, 10 is made smaller than that between inner surfaces 3d, 3d of sidewalls 3b'', 3b''; therefore, both contact pieces 10, 10 position between those inner surfaces 3d, 3d readily. Accordingly, covering work of the shield lid 8 is easy because a worker should only attend to a work to make an elastic contact piece 9 of opposing edge sections of one side reach an outer surface 3c of a sidewall 3b'. When a shield case 2 is completed by putting the shield lid 8 on both opening sections 3a, 3a of the base frame 3 through this operation, the shield case 2 is inserted into an outer case 1 from an opening section 1a thereof and is fixed to the outer case 1 with a stopper 13. Assembly of BS converter is completed in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic device case in which an electronic circuit is housed.

[Conventional technology]

Examples of this type of case include, for example, Japanese Patent Application Laid-Open No. 61-2070
As shown in Publication No. 97, it is composed of a base frame and a shield lid that is placed over the base frame, and the shield lid has elastic contacts on each of its four peripheries to make it come into elastic contact with the outer surface of the side wall of the base frame. Some have pieces.

[Problem to be solved by the invention]

In this conventional case, the shielding performance is very good when the shield cover is placed on the base frame, but when trying to do so, all four circumferential elastic contact pieces are simultaneously attached to the outer surface of the base side wall. The problem was that this work was extremely difficult to perform. The present invention has been made in view of the above points, and its purpose is to make it possible to perform the work of putting the shield lid on very easily, and to provide very good shielding properties in the put-on state. It is an object of the present invention to provide an electronic device case that has the following features.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows. [Operation] When closing the shield lid to the base frame, the elastic contact piece is brought into elastic contact with the outer surface of one opposing side wall of the base frame. In this case, both contact pieces easily fit between the other opposing side walls.
When the base frame with the shield lid closed is stored inside the outer case,
The square-shaped shield lid is stretched out, and both contact pieces are brought into pressure contact with the inner surfaces of the other opposing side walls. [Example] Drawings showing examples of the present application will be explained below. The drawing shows a BS converter as an example of high-frequency electronic equipment. This BS converter has an outer case l made of a conductive material, for example, an aluminum die-cast molded product, and a shield case 2 housed inside the outer case l.

The shield case 2 will be explained below. Reference numeral 3 denotes a base frame, which is made of a conductive material such as an aluminum die-cast molded product. As clearly shown in FIG. 3, the base frame 3 has two recesses for accommodating electronic circuits that open on opposite sides. Note that the recess may be provided only on one side. Reference numeral 4 shown in FIG. 4 is a flange for connecting the primary radiator provided on the base frame 3, and is provided with a waveguide 5 shown as a signal introduction section. 6 indicates an electronic circuit housed in the recess of the base frame 3, and is a circuit board (for example, a printed circuit board) 6
It is constructed by attaching various electronic parts 6b to a. Among the electronic circuits 6, for example, 6C is a high frequency amplification and frequency conversion circuit, 6d is a local oscillator, and 6e is an intermediate frequency amplification circuit. 7 is a plug seat shown as an output part attached to the base frame 3. Next, reference numeral 8 indicates a shield lid in the shield case 2, which is a metal plate with good conductivity and elasticity, such as 0.
It is formed by pressing a 2N thick tin-plated iron plate (phosphor bronze plate may also be used). The main body portion 8a of the shield lid 8 is formed to be large enough to close the opening 3a of the recess in the base frame 3, as shown in FIGS. 1 and 4.
As shown in the figure, it is bent in a U-shape at the middle portion. Reference numeral 9.9 denotes an elastic contact piece provided on one opposing edge of the shield lid 8, and the outer surface 3c of one opposing side wall 3b', 3b' at the opening edge 3b of the recess.
, 3c, and is formed to have a cross-sectional shape as shown in FIG. 3 to obtain a sufficient spring effect. In addition, the elastic contact pieces 9 are provided with a large number of short width pieces spaced apart from each other, but instead, long size pieces are provided at each part indicated by ``a'' and ``mouth'' in Fig. 1. Good too. 10. Reference numeral 10 denotes a contact piece provided on the other opposing edge of the shield lid 8, and the inner surface 3 of the other opposing side wall 3b'', 3b'' at the opening edge 3b.
This is for contacting d and 3d. The distance between these contact pieces is made smaller than the distance between the inner surfaces 3d, 3d by bending the main body portion 8a of the shield lid 8 into a square shape. Reference numeral 11 denotes a protruding piece provided in the intermediate part, which is formed by cutting and raising a part of the main body part 8a as shown in the figure, and its upper surface serves as a pressed part 11a that is pressed against the inner surface of the outer case l. . The projecting piece l1 has both ends connected to the main body part 8a, and has high pressure resistance (
(so that it is difficult to buckle). The projecting piece 11 is formed to be sufficiently small (for example, 1.8 l in width and 9 am in length) so that substantial leakage of high frequency waves through the hole formed by cutting and raising it is reduced. The height of the protruding piece 1l is formed to be slightly larger than the dimension corresponding to the gap between the inner surface 1b of the outer case 1 and the base frame 3 when the inner number ε base frame 3 of the outer case 1 is inserted. The height of the pressed portion 11a is set to be a height sufficient to obtain the functions described below. The reference numeral 13 shown in FIG. 1 indicates a stopper for fixing the base frame 3 of the shield case 2 to the outer case l, and for example, a threaded rod as shown in the figure is used. 14 is a waterproof panokin attached to the stopper 13.

Next, the assembly of the electronic device having the above configuration will be explained. First, the electronic circuit 6 is mounted inside the base frame 3 as is well known. Next, as shown in FIG. 4, a shield lid 8 is placed over the opening 3a of the base frame 3. In this case, both contact pieces 10. 10
The distance between them is the inner surfaces 3d, 3 of the side walls 3b'', 3b''
d is smaller than the distance between each other, so both contact pieces 1
0. 10 is easily located between the inner surfaces 3d and 3d. Therefore, it is only necessary to concentrate on bringing the elastic contact piece 9 of one opposing edge to the outer surface 3c of the side wall 3b', and the work of fitting the shield lid 8 is easy. Both openings 3a, 3a of the base frame 3 are removed by the above-mentioned work.
Once the shield case 2 is completed by covering each of the shield lids 8, insert the shield case 2 into the outer case l through the opening 1a as shown in FIG. 2, and remove it with the stopper l3. Fix it to case l. This is BS
Assembly of the converter is completed. In the assembled state as described above, the pressed portion 11a of the projecting piece 11 is pressed against the inner surface tb of the outer case l, and the main body portion 8a is stretched into a flat state. Therefore, as shown in FIG. 3, the inner surfaces near both edges come into contact with the end surfaces of the side wall 3b', resulting in good electrical continuity there, and as shown in FIG. 2, both contact pieces 10.
LO side wall 3b'', 3b' inner surface 3d, 3tH.:
They are pressed together and have good electrical continuity there. Also, as a matter of course, the large number of elastic contact pieces 9 come into pressure contact with the outer surface 3C of the side wall 3b' with their respective elasticity, and good electrical continuity is established between the two. As a result, the base frame 3 and the shield M8 are completely integrated in terms of high frequency, and the internal electronic circuit 6 is in an extremely good shielding state. Not only this, but the contact between the protruding piece 11 and the inner surface 1b of the outer case 1 also improves the electrical continuity between the shield lid 8 and the outer case l. In this respect as well, the shielding condition of the electronic circuit 6 becomes better.

Next, Figs. 5 to 7 show different embodiments of the shield lid, and Figs. 5 and 6 show examples in which the positions and number of protrusions lie are arranged in the middle part of the shield fi8e,
FIG. 7 shows examples of different bending positions of the seal lower Ie.

In addition, for parts that are considered to be functionally the same or equivalent to those in the previous figure, the same reference numerals as in the previous figure are appended with an e (alpha to 7}), and redundant explanations are omitted. [Effects of the Invention] As described above, in the present invention, the pair of contact pieces 10. 10 is smaller than the distance between the pair of side walls 3b" and the inner surfaces 3d of the base frame 3, 3d, so when the shield lid 8 is placed on the base frame 3, the distance between the shield M8 A pair of elastic contact pieces 9, 9 are attached to a pair of side walls 3b'', 3b'' of the base frame.
The above-mentioned pair of contact pieces 10. 10 is the inner surface 3d, 3
d can be inserted naturally between each other,
This has the effect of making the work of putting the shield lid 8 on very easy. Moreover, due to the above-mentioned dimensional relationship, even if there is a gap between the contact piece 10 and the inner surface 3d when the shield lid 8 is attached, the shield case 2 cannot be inserted into the outer case l. In the stored state, the pressed part i of the shield lid 8
ta is pushed against the inner surface 1d of the outer case 1, the shield lid 8 is pushed and stretched, and the contact piece 10 is pushed against the inner surface 3.
d, and the inside of the shield case 2 is effectively shielded.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is an exploded perspective view of an electronic device, Fig. 2 is a partially cutaway side view of the same, Fig. 3 is a cross-sectional view taken along the line ■, and Fig. 4 shows a shield lid. Figures 5, 6, and 7 are perspective views showing different embodiments of the shield lid. l...outer case, 2...shield case, 3...base frame, 8...shield lid. Diagram

Claims (1)

[Claims] It consists of an outer case and a shield case that is housed inside the outer case, and the shield case includes a base frame having a recess for housing an electronic circuit, and a shield for closing the opening of the recess in the base frame. In an electronic device case comprising a lid, the shield lid includes elastic contact pieces for making elastic contact with outer surfaces of one opposing side wall of the opening, respectively;
Contact pieces for press-contacting the inner surfaces of the other opposing side walls are provided at corresponding edges, and the distance between the contact pieces is equal to the distance between the inner surfaces of the other opposing side walls. The shield lid is bent in a U-shape at an intermediate portion between the pair of contact pieces, and the intermediate portion of the shield lid has the aforementioned one in a closed state with respect to the opening. It is provided with a pressed part that is pressed by the inner surface of the outer case when stored in the outer case, and the height of the pressed part is lower than the height above when pressed by the inner surface of the outer case. An electronic device case characterized in that the square-shaped shield lid is stretched to a height such that the pair of contact pieces are in pressure contact with the inner surfaces of the other opposing side walls.