JP2823503B2 - Printed circuit board mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mounting a printed circuit board, and more particularly to a device for mounting a printed circuit board of an apparatus which can accommodate two kinds of products having different functions by using the same housing. Things.

[0002]

2. Description of the Related Art Conventionally, when the same housing is used to accommodate products having different functions of a low function and a high function, for example, it is configured as shown in FIG. That is, in FIG. 4, reference numeral 15 denotes a device housing, and reference numeral 16 denotes a printed circuit board. Two types of printed circuit boards 16 are prepared for a standard function model and a high function model.
7 to the housing 15. This conventional technique has a problem that it is uneconomical to prepare two types of substrates in which many parts of the substrate are common.

Therefore, as shown in FIG. 5, the standard function model has only the standard board 18 and the high function model has the standard board 18.
In addition to the above, there is a configuration in which the additional function board 19 is screwed with a screw 17. In this conventional example, in order to reduce the number of parts and the number of assembling steps by effectively utilizing the arrangement space and reducing the number of screwing points, when mounting two boards, a part of the boards is overlapped with each other and screwed simultaneously. Is done.

[0004]

However, even in such a conventional technique, there is a problem that the number of screws for fixing the board is large and the number of working steps and the number of parts are increased. Further, in this conventional technique, when the standard board 18 disposed below is removed from the two boards that are overlapped during repair or the like, the additional function board 19 disposed above must be removed. However, there is a problem that workability is poor.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, a printed circuit board mounting apparatus according to the present invention fixes one or both of two printed boards in a single housing, and In the case of fixing both printed boards, in a printed board fixing apparatus configured to fix a part of the two printed boards on top of one another, a pair of notches are provided on one side of the printed board, respectively. A pair of support portions for engaging the notch portion and fixing the substrate are integrally formed in the housing, and the support portion is provided with a first support step portion abutting on a lower surface of one of the printed circuit boards, A second supporting step formed at a position slightly lower than the position where the thickness of the printed circuit board is added to the height at which the first supporting step is formed, and pressing and supporting the upper surface of one substrate, and the other Under the printed circuit board And a third supporting step which is formed at a position slightly lower than a height obtained by adding the thickness of the printed circuit board to the height at which the third supporting step is formed, and presses the upper surface of the other substrate. And a fourth supporting step for supporting.

[0006]

Therefore, in the printed circuit board fixing apparatus according to the present invention, one of the printed boards is held by the first and second supporting steps, and the other is partially overlapped with the printed board. The other printed circuit board is fixed by the fourth support step.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a vehicle-mounted adapter of a portable telephone will be described below with reference to the drawings. FIG.
In the figure, reference numeral 1 denotes a housing of an in-vehicle adapter.
, Two support parts 2 are integrally formed, and a screw boss 3, an elastic locking piece 4, and a positioning boss 5 for fixing the printed circuit board with the support part 2 interposed therebetween are integrally formed. Is done. Reference numerals 6 and 7 denote a standard functional board and an additional functional board as first and second printed boards, respectively.
The standard function board 6 is a board for a charger, and the additional function board 7 is a board for control. Each of the substrates 6 and 7 is provided with a pair of notches 8 and 11 for engagement, and second notches 9 and 10 are provided continuously with the notches 8 and 11 for engagement. ing. Reference numeral 10 denotes a screw hole provided in the standard function board 6, and a screw 14 is inserted through the screw hole 10.
Thereby, the standard function board 6 is fixed to the housing 1. Reference numeral 13 denotes an engagement hole provided in the additional function substrate 7, and the additional function substrate 7 is fixed to the housing 1 by the elastic engagement piece 4 through the engagement hole 13.

The support 2 has a shape as shown in FIG. That is, the support portion 2 includes a first support step portion 2a with which the lower surface of the standard function substrate 6 contacts, a second support step portion 2b with which the upper surface of the standard function substrate 6 contacts, and a lower surface of the additional function substrate 7. It has at least a third supporting step 2c to be in contact with and a fourth supporting step 2d to be in contact with the upper surface of the additional function substrate 7.
If the height of the first supporting step 2a is h1, the height of the second supporting step is h2, and the thickness of the printed circuit boards 6, 7 is T,

[0009]

(Equation 1)

The dimensions are determined so as to satisfy the following. Accordingly, forces F1 and F2 act on the vicinity of the engagement notch 8 of the standard function board 6, and as a result, the standard function board 6 is elastically held by the second notch 9. Become.

The additional function substrate 7 is also elastically held by the third and fourth supporting steps 2c and 2d. Further, the height of the third supporting step 2c is formed at a position slightly higher than that of the second supporting step, and as a result, the two substrates 6, 7 are held at positions where they overlap with a gap therebetween. Therefore, attachment and detachment of the substrate are easy.

The first to fourth step portions 2a to 2d are formed symmetrically with each other by the two support portions 2,2.

FIG. 3 is a view showing a high-performance model in which both the standard function board and the additional function boards 6 and 7 are fixed to the housing 1. As shown in the figure, one end of the two substrates is
The standard function board 6 is fixed by screws 14, and the additional function board 7 is fixed by the elastic engagement piece 4. The fixing of any of the substrates is independent of each other, and the standard functional substrate 6
Only the standard function model can be fixed securely. Further, even when two substrates are fixed, the other substrate can be removed without removing the other substrate.

[0014]

As described above, the printed circuit board mounting apparatus according to the present invention uses the same housing and has different functions.
In a printed circuit board mounting device for equipment that can handle various types of products, it is possible to securely mount the substrate with a very simple configuration, and even if two substrates are fixed, the other substrate The other substrate can be removed without removing the substrate, and workability during service is good.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a printed circuit board mounting device according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of the printed circuit board mounting device according to the present invention.

FIG. 3 is a perspective view showing a main part of the printed circuit board mounting apparatus according to the present invention.

FIG. 4 is a view showing a conventional printed circuit board mounting device.

FIG. 5 is a diagram showing a printed circuit board mounting device according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 6 1st printed circuit board 7 2nd printed circuit board 8, 11 Notch part 2 Support part 2a First support step part 2b Second support step part 2c Third support step part 2d Fourth support Steps 9, 12 Second notch

Claims (3)

(57) [Claims] When one or both of two printed boards are fixed to one housing and both printed boards are fixed, a part of the two printed boards is vertically fixed. In the printed circuit board mounting device configured as described above, a pair of notches is provided on one side of the printed circuit board, respectively, and a pair of support portions that are engaged with the notches and fix the substrate are integrally formed in the housing. With
The supporting portion is a first supporting step abutting on the lower surface of one of the printed circuit boards, and a position slightly lower than a position obtained by adding the thickness of the printed circuit board to the height at which the first supporting step is formed. A second supporting step that presses and supports the upper surface of one of the substrates, a third supporting step that contacts the lower surface of the other printed circuit board, and a height at which the third supporting step is formed. A fourth supporting step formed at a position slightly lower than a position obtained by adding the thickness of the printed board to the upper surface of the other board. 2. The printed circuit board mounting apparatus according to claim 1, wherein a third supporting step is formed at a position higher than the second supporting step. 3. The printed circuit board mounting apparatus according to claim 1, wherein a second cutout portion is provided continuously to the cutout formed on the printed circuit board. apparatus.