JP2584960Y2 - Printed circuit board holding case structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding case structure for a printed circuit board, and more particularly to a holding case structure for holding a printed circuit board in a metal case and for easily assembling upper and lower cases.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 4 and 5, a lower surface is opened, side walls 1A, 1B, 1C and 1D are provided on four sides, and a mounting piece 2 is mounted on a pair of opposed side walls 1B and 1D. The upper case 3 made of metal and the upper surface are opened, and the side walls 4A,
4B, 4C, 4D, and a pair of opposed side walls 4B, 4B.
D, a metal lower case 6 having mounting pieces 5 respectively corresponding to the mounting pieces 2 of the upper case 3 and electronic parts (not shown) are mounted, and the mounting pieces 2 of the upper case 3 and the lower case 6 are squared. 5
And a printed circuit board 8 having through holes 7 corresponding to the screw holes 2A and 5A provided in the upper case 3 and the upper case 3 and the lower case 6. , 5 and the through-hole 7 of the printed circuit board 8 are fixed using screws 9.

[0003]

However, according to the structure described above, four screws are required to fix the printed circuit board 8, the number of parts is large, and the printed circuit board 8 is not positioned. Since it is fixed at the same time as the upper and lower cases 3 and 6, it is difficult to assemble and many man-hours are required.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a printed circuit board and an opening on the upper surface.
The printed circuit board has a bottom surface and a side wall.
With the cut-and-raised part
The lower case with a hole between
Mouth side wall and the hole at the lower end of the side wall
By engaging and having an obtuse angle of 90 ° + α with the side wall
An upper case including a claw portion that contacts a bottom surface of the lower case.
It consists of and.

[0005]

The printed circuit board is temporarily fixed at the cut-and-raised portion of the lower case, and the upper case and the lower case are positioned and fixed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the gist of the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 3, but the same or corresponding parts as those of the conventional example will be denoted by the same reference numerals and detailed description thereof will be omitted. Omit.

An upper surface is opened so as to cover electronic components (not shown) mounted on both sides of the printed circuit board 8, and four sides are formed as side walls 4.
A, 4B, 4C and 4D enclose the metal lower case 6
A cut-and-raised portion 10 for holding the printed circuit board 8 therebetween and a hole 12 between the cut-and-raised portion 10 and the bottom surface 11 of the lower case 6 are formed inside one side wall 4B of the opposed side walls 4B and 4D. A mounting piece 5 having a screw hole 5A is formed outside the upper end of the other side wall 4D.

Then, the lower surface is opened, and the four surfaces are side walls 1A,
1B, 1C, and 1D, the metal upper case 3 is engaged with the hole 12 formed in the lower case 6 at the lower end of one of the side walls 1B of the opposing side walls 1B, 1D, and the hook facing inward. A claw portion 13 is formed. The claw portion 13 has an obtuse angle of 90 ° + α with respect to the side wall. A screw hole 5 provided in the mounting piece 5 of the lower case 6 is provided outside the lower end of the other side wall 1D.
Two mounting pieces 2 each having a screw hole 2A corresponding to A are formed.

The method of assembling the printed circuit board 8, the upper case 3 and the lower case 6 is as follows. The printed circuit board 8 is moved to the lower case 6 in the direction of the arrow in FIG. Then, the claw portion 13 of the upper case 3 is locked in the hole portion 12 of the lower case 6. At this time, since the claw portion 13 is formed at an obtuse angle with respect to the side wall 1B, the claw portion 13 comes into contact with the bottom surface 11 of the lower case 6, and a force acts in a direction of pressing the bottom surface 11, thereby mounting the upper case 3. The piece 2, the printed circuit board 8, and the mounting piece 2 of the lower case 6 are fixed by screws 9, so that rattling after the upper case 3 and the lower case 6 are assembled can be prevented.

Further, the cut-and-raised portion of the lower case 6 of the present invention.
When forming 10, the hole 12 is first formed, and then a cut is made to form the cut-and-raised portion 10, and the cut and raised portion 10 is protruded inward by pressing with a press. With such a configuration, the cut-and-raised portion 10 for holding the printed circuit board 8 and the claw portion 13 of the upper case 6 are engaged with each other.
It is not necessary to separately form 12 and 12, and they can be formed at the same time, and the number of steps can be reduced.

The present invention is not limited to the above embodiment, but can be variously modified within the scope of the present invention. For example, the cut-and-raised portion 10 of the lower case 6 and the mounting piece 5 are provided on the opposed side walls 4B and 4D, but need not be provided on the opposed side walls 4B and 4D.
If the mounting pieces 5 can be held, the other side walls 4A, 4A
C may be provided.

[0012]

According to the above configuration, the printed circuit board is built in, the printed circuit board can be positioned when the upper and lower cases are fixed to the printed circuit board, and after the upper and lower cases are assembled and fixed, rattling due to dimensional errors of the upper and lower cases can be prevented. There is an extremely effective effect that the assembling can be performed reliably.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment according to the present invention.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a sectional view of a claw portion of the upper case of the embodiment.

FIG. 4 is an exploded perspective view of a conventional example.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

1A, 1B, 1C, 1D, 4A, 4B, 4C, 4D Side wall 3 Upper case 6 Lower case 8 Printed circuit board 9 Screw 10 Cut-and-raised portion 11 Bottom surface 12 Hole portion 13 Claw portion

Claims (1)

(57) [Scope of request for utility model registration] 1. A printed circuit board having a top surface opened and a bottom surface and a side
A wall having a wall and the side wall holding the printed circuit board.
A raised portion, and the raised portion and the bottom surface
And a lower case with a hole between
The side wall is engaged with the hole at the lower end of the side wall.
The lower casing has an obtuse angle of 90 ° + α with the side wall.
And an upper case with a claw to abut
Holding case structure of a printed circuit board, characterized in that it has.