JPS5927100Y2 - Printed circuit board mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for mounting a printed circuit board to a casing made of a synthetic resin material.

In the conventional mounting structure of this kind, generally, at least a pair of elastic locking pieces having locking claws at the tips are erected on the housing, and the elastic deformation of the elastic locking pieces is utilized. A structure is known in which a printed circuit board is attached by engaging with a locking claw.

However, in such a structure, in order to easily attach and detach the printed circuit board, it is necessary to make the height of the elastic locking piece higher than necessary to apply a predetermined elastic force. Because the elastic locking pieces are supported at a height apart from the mounting surface, vibrations, impacts, etc. may cause the printed circuit board to swing and come off the locking claws, and the elastic locking pieces may suffer from elastic fatigue. However, there was a risk of damage etc.

In addition, as an improvement to the above-described structure, in order to lower the height of the elastic locking piece, it is possible to form the cross section into an L-shape, but in this case, the lower side of the elastic locking piece It is necessary to provide a slit in the housing to form the
This corresponds to a part of the mounting surface of the casing on which the printed circuit board is attached, and a part of the printed circuit board can be seen through from outside the casing, which is not desirable in terms of appearance or safety. Ta.

In view of these points, the present invention forms a recessed portion in which a printed circuit board is accommodated in the housing, and a pair of projecting portions protruding from near one end side of both opposing sides of the recessed portion in a planar direction so as to be close to each other. The simple structure of providing an elastic locking piece allows the printed circuit board to be easily and reliably attached and removed, and provides a printed circuit board mounting structure that is excellent both in terms of appearance and safety. .

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIGS. 1 and 2 show an embodiment in which the printed circuit board mounting structure according to the present invention is applied to, for example, a telephone housing.

In these figures, the telephone casing, which is designated as a whole by reference numeral 1, is integrally molded from a synthetic resin material, and the bottom part 2 has a recessed part 4 for mounting a printed circuit board 3, which accommodates and holds a printed circuit board 3 therein. is formed.

This concave portion 4 is a feature of the present invention, and its size is set so that its length in the vertical direction is slightly larger than that of the printed circuit board 3 to which it is attached, and its depth is determined by the thickness of the printed circuit board 3. It is set slightly longer than it is.

Now, according to the present invention, a pair of elastic locking pieces 7, 8 protrude in the planar direction so as to be close to each other on the opposing left and right side surfaces 5, 6 of the concave portion 4, near one end thereof.
is provided.

At the tips of these elastic locking pieces 7 and 8, locking claws 7a and Ba are provided, respectively, which project toward the side surfaces 9 of the other end of the recessed portion 4, and these locking claws 7a , 8a are configured to lock one side edge of the printed circuit board 3 housed inside the recessed portion 4 and inside the elastic locking pieces 7 and 8 from above.

Incidentally, the upper end portions of the locking claws 7 a and B a are formed with inclined surfaces that slope inward.

Further, reference numerals 7b and 8b in FIG. 2 indicate die-cutting slits for forming the elastic locking pieces 7 and 8 and their locking claws 7a and 8a.

On the other hand, two locking protrusions 10.11 are protruded from the side surface 9 on the other end side of the recessed portion 4 facing the locking claws 7a, 8a to face each of the locking claws 7a, 8a. There is.

These locking protrusions 10.11 serve as engaging portions that lock the other side edge of the printed circuit board 3, and the printed circuit board 3 is The support stand 12a is slightly spaced apart.

12b is integrally formed.

These support stands 12a and 12b are for protecting the wiring provided on the back side of the printed circuit board 3 or attached electronic components, and for facilitating the removal of the printed circuit board 3 from the recessed portion 4. Support pieces 14 a , 14 b : 15 , 16 are also provided on other side surfaces of , that is, both opposite side surfaces 5 and 6 and the side surface 13 on one end side, respectively.

Further, among the above-mentioned support pieces, the support pieces 15 and 16 provided on the side surface 13 on the one end side are located approximately at the same position as the inner surfaces of the bases of the locking claws 7a and 8a of the elastic locking pieces 7 and 8, or slightly A locking surface 15a that stands up vertically at a position shifted outward from the
16a, and the printed circuit board 3 which is locked by the locking claws 7a, 8a and the locking protrusion 10.11 by these locking surfaces 15a, 15a is moved in the direction of arrow A in the figure, that is, the elastic locking piece 7 , 8 in the direction of elastic deformation.

Therefore, when installing the printed circuit board 3 in the recessed part 4 of the above-described structure, first insert one side edge of the printed circuit board 3 between the locking projection 10.11 and the support bases 12a and 12b, Furthermore, as shown in FIG. 3a, the other side edge of the printed circuit board 3 is pressed from above the locking claws 7a, 8a against the elasticity of the elastic locking pieces 7, 8, thereby locking the locking claws 7a. ,
This can be easily done by engaging with 8a.

In this case, the printed circuit board 3 can be more easily attached by forming the upper ends of the locking claws 7a and Ba into inclined surfaces.

Also, the printed circuit board 3 attached as described above
tries to move in the direction of arrow A due to vibration etc., but as shown in FIG.
a, 16a, and is stably housed and held within the recessed portion 4.

Further, the printed circuit board 3 can be easily removed by disengaging the locking claws 7a, 8a and pulling it out from the side edge.

As explained above, according to the printed circuit board mounting structure according to the present invention, a recessed portion for mounting a printed circuit board is formed in a housing made of a synthetic resin material and has a shape slightly larger than that of a printed circuit board, and both opposing sides thereof are formed. A pair of elastic locking pieces having locking claws are protruded in the plane direction so as to be close to one end of the surface, and an engaging portion is provided on the side surface of the other end side so as to face the locking claws. Since the protruding structure is simple, it is possible to easily and reliably attach and detach the printed circuit board, and the amount of protrusion of the recessed portion to the outside is minimized, resulting in an excellent appearance. The amount of light seen through the slit can also be suppressed to the necessary minimum, making it possible to achieve excellent safety.

In addition, in the present invention, a stopper is provided on the side surface of one end of the concave portion to restrict movement of the elastic locking piece in the direction of elastic deformation, so that the printed circuit board may adversely affect the elastic locking piece due to vibration etc. It has the advantage of reliably preventing such problems and thereby guaranteeing a long life.

[Brief explanation of drawings]

The figures show an embodiment of the printed circuit board mounting structure according to the present invention, FIG. 1 is a schematic perspective view, FIG. 2 is a plan view, and FIGS. FIG. 1... Housing, 3... Printed circuit board, 4
...Concave portion, 5°6...Both opposing sides, 7, 8...Elastic locking pieces, 7a, 8a...
...Latching claw, 9...Both sides of the other end, 10.1
1... Locking protrusion, 15.16... Support piece, 15 a, 16 a... Locking surface.

Claims (1)

[Scope of utility model registration request] A housing made of a synthetic resin material is provided with a recess for mounting a printed circuit board, which is formed in a shape slightly larger than the printed circuit board, at a predetermined location. a pair of elastic locking pieces that protrude in a planar direction so as to be close to each other and have locking claws at their tips that protrude toward the other end of the recessed portion and lock one side edge of the printed circuit board from above; a retaining portion that is provided on the side surface of the other end of the recess so as to face the retaining pawl and similarly retains the other side edge of the printed circuit board; and a printed circuit board that is retained by the retaining pawl and the engaging portion. and a stopper protruding from a side surface of one end of the recessed portion to restrict movement of the elastic locking piece in the direction of elastic deformation.