JPH025554Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an electronic circuit device.

(Prior art) When configuring an electric circuit with resistors, capacitors, transistors, and other electronic components, it has been conventional practice to load these electric components onto a printed circuit board and to house the printed circuit board in a case. There is.

FIG. 9 shows a conventional device of this kind, in which 21 is a printed circuit board, 22 is an electrical component mounted on the surface of the board, 23 is a case body, and 24 is a lid thereof.
The case body 23 is formed in a U-shape, and an insulating plate 25 is installed on the bottom surface of the case body 23 in advance.The printed circuit board 21 is placed on the surface of the insulating plate 25, and the printed circuit board 21 and the case body 23 are connected to each other. It is installed in an insulated state, and a lid 24 is attached to the case body 23.
to be fixed. In this case, a protrusion 26 is formed on the lid 24 and a hole 27 into which the protrusion 26 fits is formed on the case body 23, and the lid 24 is fixed to the case body 23 by fitting the protrusion 26. There is.

However, according to such a configuration, since the case body 23, the lid 24, and the insulating plate 25 are required to load the printed circuit board 21, the number of parts used increases, and the protrusion 26 of the lid 24 is larger than the case body 23. Since they are simply fitted together, they have the disadvantage that even the slightest impact can cause them to come undone.

(Problems to be solved by the invention) This invention aims to reduce the number of parts used in the case and improve the mechanical strength of the case in an electronic circuit device in which a printed circuit board is housed in a case. .

(Means for solving the problem) This idea uses a case body that is integrated with the lid, and when fixing the insulating plate integrally fixed to the printed circuit board to the case body,
At the same time, the lid part is configured to cover the case body.

(Example) An example of this invention will be described with reference to the drawings. Reference numeral 1 denotes a case body, which includes a bottom wall portion 2, a side wall portion 3, and a lid portion 4 that are connected to each other. FIG. 3 shows the case body 1 developed and shown, and is constructed into a case shape by folding it as shown in FIG. 4. In order to facilitate folding of the side wall portion 2 into the bottom wall portion 2, perforations 5 are formed along the folding line in the illustrated example. A cut-out piece 6 is formed on the bottom wall part 2, and a claw piece 7 is formed on the upper edge of the side wall part 2.

Reference numeral 10 denotes a printed circuit board, on the surface of which electronic components 11 constituting an electronic circuit are mounted. 12
is an insulating plate, and side wall portions 13 are integrally formed on both edges thereof. Further, this side wall portion 13 has a hole 14 through which the cut-and-raised piece 6 passes, and a protrusion 15 inside which the side edge of the printed circuit board 10 engages.
is formed.

In the above configuration, the case main body 1 has the fourth
As shown in the figure, along each fold line, the side wall portion 3,
Fold in the lid part 4. In this case, the side wall portion 3
is bent to such an extent that it is not perpendicular to the bottom wall portion 2.

On the other hand, a printed circuit board 10 loaded with electronic components 11
is fitted between the side wall portions 13 of the insulating plate 12.
When the side edge of the printed circuit board 10 is fully fitted to the extent that it passes through the protrusion 15, the insulating plate 12
The printed circuit board 10 is sandwiched between the and the protrusions 15 and fixed integrally. FIG. 8 shows this fixed state.

The insulating plate 12 integrated with the printed circuit board 10 is attached to the case body 1 in this way, but in order to do so, the insulating plate 12 is attached to the lid 4 of the case body 1, which has been formed in advance as shown in FIG. The insulating plate 12 is housed in the case body 1 so that the bottom surfaces of the insulating plate 12 are in close contact with each other. In order to simplify this storage operation, it is preferable to insert the insulating plate 12 after the case body 1 is placed with its lid 4 facing down.

After inserting the insulating plate 12 into the case body 1 in this manner, fold the cut-out piece 6 into the case body 1 through the hole 14 formed in the side wall 13 of the insulating plate 12. By embracing the insulating plate 12, the insulating plate 12 is integrally connected to the side wall portion 3 of the case body 1.

Further, the claw piece 7 is bent so as to embrace the edge of the side wall portion 13 of the insulating plate 12. By this bending, both side wall portions 3 and 13 are integrated with each other. As a result, both side walls 3 of the case body 1 are connected to the insulating plates 12.
They become connected to each other through.
Then, by bending the cut and raised pieces 6 and the claw pieces 7, the both side wall parts 3 are drawn toward each other, so that the lid part 4
can be closed to close the case body 1. Through the above steps, the storage of the printed circuit board 10 into the case body 1 is completed.

(Effects of the invention) As detailed above, according to this invention, the lid is integrated with the case body from the beginning.
There is no need to prepare the case body and the lid separately as in the past, so the number of parts used is reduced accordingly, a mechanism for connecting the lid to the lid is unnecessary, and the case is connected to the lid. Since the side wall portions are integrally connected via the insulating plate 12, the mechanical strength of the case body itself is improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of this invention;
The figure is a partial sectional view, Figure 3 is an exploded view of the case body, Figure 4 is an assembled view of the same, Figure 5 is a perspective view of the printed circuit board, Figure 6 is a perspective view of the insulating plate, and Figure 7 is FIG. 8 is an assembled view of the insulating board and printed board, and FIG. 9 is an exploded perspective view of the conventional example. DESCRIPTION OF SYMBOLS 1... Case body, 2... Bottom wall part, 3... Side wall part, 4... Lid part, 6... Cut-out piece, 7... Claw piece, 10... Printed circuit board, 12... Insulating plate ,1
3... side wall portion, 14... hole, 15... protrusion.

Claims (1)

[Scope of utility model registration request] A printed circuit board whose surface is loaded with electrical components constituting an electronic circuit is inserted and fixed between the side walls provided on both sides of the insulating plate, so that the bottom wall, side walls, and lid are connected integrally. The insulating plate is inserted between the side walls of a case body configured to have the same structure, the cut and raised piece provided on the side wall of the case body is bent so as to embrace the side wall of the insulating plate, and then the case body is bending a claw piece formed on the upper edge of the side wall of the insulating plate so as to embrace the side wall of the insulating plate;
An electronic circuit device in which the case body and the insulating plate are integrally connected.