JPS5816210Y2 - electronic circuit equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronic circuit device that houses an electronic circuit mounted on a printed circuit board.The purpose of this invention is to reduce the weight of the storage container for the printed circuit board, and to facilitate its assembly. The object of this invention is to provide a structure that can be carried out extremely easily.

The present invention will be described below based on an embodiment shown in the accompanying drawings.

In Figure 1 and Figure 2, 100 is a box-shaped case molded from resin such as ABS, 200 is a printed circuit board held near the opening inside the case 100, and 300 is a box-shaped case molded from resin such as ABS.
The bottom plate is made of metal and is made by pressing a thick iron plate with some elasticity.

A plurality of first protrusions 104, 105° 106.1 are formed on each inner circumferential wall of the case 100 to protrude in the inner circumferential direction.
07 (what is in the shaded part is not shown) is provided,
The printed circuit board 200 is positioned by the first protrusions 104, 105, 106, and 107.

1, each of the protrusions 104a and 10 of the first protrusion
5a, 106a, and 107a are in contact with the periphery of the printed circuit board 200.

Note that 103 is a guide rail for determining the insertion direction when inserting the printed circuit board 200, and has a shape that matches the notch 201 provided at the end of the printed circuit board 200.

202, 203, and 204 are cutouts for inserting into another case.

Four second projections 110°, 111.11 are formed at appropriate intervals on the end surface of the opening of the case 100.
2,113 is provided, and this second protrusion allows the bottom plate 3
It is in contact with the periphery of 00, especially the four corners.

The second protrusion 110 is provided on each outer peripheral wall of the case 100.
．． 111, 112, and 113 are four third protrusions 101 that are formed to protrude in the outer circumferential direction at positions where all the buttons are spaced at appropriate intervals.
．． 102 (the shaded part is not shown) is the provision.

Each of the third protrusions is located approximately at the center between the second protrusions.

On the other hand, the third protrusion 10 of the case 100 is attached to the bottom plate 300.
1° 102 and four claws 30L302 (
The shaded portion (not shown) is bent.

Then, for assembly, the claw parts 301 and 302 of the bottom part 300
and the third protrusion 10L102 of the case 100 are engaged with each other.

The claw portions 301 and 302 have bulging portions 301a, 301b, 302a, and 302b formed at the bent portions, respectively, so that the claw portions 301 and 302 themselves can provide a spring effect.

At the peripheral edge of the bottom plate 300, there is a protrusion 3 formed by bending at an appropriate distance from the claws 301 and 302.
03, 304, and 305 (shaded portions are not shown), and these protrusions allow the printed circuit board 200 to be attached to the first protrusion 10 inside the case when the case 100 and the bottom plate 300 are engaged.
4,10#5°106.107 It is pressed against the protruding part.

In addition, these protrusions 303, 304, 305 are connected to the case 10.
It also comes into contact with the inner circumferential wall of the case 100 and the bottom plate 300 to prevent rotation between the case 100 and the bottom plate 300.

The assembly of the above configuration will be explained.

1. First, fit the printed circuit board 200 into the case 100 according to the guide rails 103.

At this time, the printed circuit board 200
It is positioned by each protrusion of 5,106 degrees and 107 degrees.

It is possible to move the printed circuit board 200 slightly in the plane direction.

Then, the bottom plate 300 is pressed so as to cover the opening of the case 100.

The claw parts 301, 302 bent from the bottom plate 300 are connected to the tapered parts LO1a, 101 of the third customer part 101, 102 of the case.
After being once expanded by b, the hole portion 301c.

302c, the third protrusions 101, 102 are completely exposed, and a complete engagement state is obtained.

Here, when the claw portions 301 and 302 are pushed outward and expanded, each peripheral wall of the case 100 also has elasticity, so that it can be slightly deformed in the inner peripheral direction, making the pressing engagement work easier. .

8. In the engaged state. The four corners of the bottom plate 300 are pressed by contact with the second protrusions 110, 111, 112, 113, and the portion between the corners is pressed by the second protrusions 101, 113.
02 and is attracted, mainly the central portion of the bottom plate 300 is elastically deformed inward of the case 100, and the protrusions 303 and 304 of the bottom plate 300 come into contact with the printed board 200.

The printed board 200 has several first protrusions 104, 105, 1
06 and 107, and can be slightly elastically deformed by the pressing force applied from the protrusions 303 and 304.

Further, the claw portions 301 and 302 always press against the outer circumferential wall of the case 100 to prevent rattling.

As described above, the case 100, the printed circuit board 200, and the bottom plate 300 are coupled using each other's elastic deformation.

Reference numeral 114 denotes a hole provided in the case 100, through which the printed circuit board 2 is inserted.
A connector for electrical connection with the electronic circuit mounted on the 00 is passed through.

According to the present invention, the copper foil pattern surface 203 of the printed circuit board 200 corresponds to the bottom plate 300, and the bottom plate 300 corresponds to the bottom plate 300.
It has been confirmed that by connecting 0 to the ground circuit, the bottom plate 300 can provide a sufficient shielding effect even when installed in a car, for example, without shielding the entire periphery of the electronic circuit.

Although the electronic circuit device using a square case has been described in the above-mentioned embodiment, it is equally possible to use a round case.

In addition, a protrusion 303.3 formed on the peripheral edge of the bottom plate 300
04, 305, the printed circuit board 200 can be pressed in the direction of the first protrusion and simultaneously brought into contact with the inner circumferential wall of the case to stop the bottom plate from rotating. printed circuit board 2
A suppression section of 00 may be provided.

In this case, the rotation between the case and the bottom plate is prevented by the claw portion 3.
01.302 alone is sufficient.

As mentioned above, the present invention has several excellent effects listed below.

(1) Since the storage container has a grooved bottom with a resin case and a metal bottom plate, the device can be extremely lightweight compared to the conventional electronic bypass device using an all-metal storage container.

(2) Since the copper foil pattern surface of the printed circuit board corresponds to the metal bottom plate, a sufficient shielding effect of the electronic circuit can be obtained.

(3) It has a structure in which the V case and the bottom plate are locked by the engagement of the (third) protrusion provided on the case and the claw provided on the bottom plate, and at the same time the case and the bottom plate are locked. Since the structure is such that the printed circuit board is held between the two, and the case, bottom plate, and printed circuit board are connected using their mutual elasticity, assembly and disassembly can be easily performed without using adhesives or screws.

Furthermore, since they are joined using elastic deformation, it is possible to compensate for errors in the dimensions of each part, increasing the ease of assembly.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the electronic circuit device according to the present invention, and FIG. 2 is a front view showing the assembled state of the device shown in FIG. 100... Case, 101, 102... Third protrusion,
104.105,106,107...first protrusion, 11
0.11L112,113...Second protrusion, 200...
・Printed circuit board, 203...Copper foil pattern surface, 300
... Bottom plate, 301, 302 ... Claw part, 303°30
4.305...Protrusion for suppressing printed circuit board.

Claims (1)

[Claims for Utility Model Registration] A storage container is constituted by a resin box-shaped case with an opening on one side and a metal bottom plate that covers the opening, and the bottom plate is covered with copper foil in the vicinity of the bottom plate in the storage container. 1. An electronic circuit device comprising a printed circuit board held so that pattern surfaces thereof correspond to each other, and characterized in that the electronic circuit device satisfies the following requirements. (a) It has a plurality of first protrusions formed on the inner circumferential wall of the case and protrudes in the inner circumferential direction, and the first protrusions are in contact with the peripheral edge of the printed circuit board. . (b) It has a plurality of second protrusions formed to protrude from the end face of the opening of the case, and the second protrusions are in contact with the peripheral edge of the bottom plate. (C) A plurality of third protrusions are formed on the outer circumferential wall of the case and protrude in the outer circumferential direction at positions appropriately spaced apart from the second protrusions, and a part of the bottom plate is provided. The case and the bottom plate are locked together while the bottom plate is elastically deformed by engagement of the claw and the third protrusion. thing. (d) A portion of the bottom hole contacts the printed circuit board and presses the printed circuit board against the first protrusion.