JPH09260871A - Assembling structure of wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling structure of a wiring board by which the production cost can be reduced greatly than therefore, conventional high accuracy is not needed, and positional adjustment can be slightly done even after a printed circuit board is fitted. SOLUTION: A projection part 13 is directly provided in the bottom plate 10 of a device body 1 and the part 13 is fitted into an almost central hole 7 of a wiring board 5. Therefor, the board 5 can be positioned and supported, thereby eliminating a chassis which is used for the assembling structure of conventional wiring board, and reducing the number of parts for cost reduction. In addition, no higher accuracy is required because of one fitting of the part 13 and central hole. Further, the fitting is completed by one-point fitting, so that the wiring board can be slightly turned at one point as a center even after completion of fitting, and positional adjustment can be slightly made even after fitting of the wiring board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of a wiring board when the wiring board is attached to an apparatus body provided with the wiring board, such as various electronic devices.

[0002]

2. Description of the Related Art As a conventional wiring board assembly structure, for example, there is one disclosed in Japanese Patent Laid-Open No. 7-45972 as shown in FIG. In this conventional wiring board assembly structure, fixing pieces 43 to 46 are formed at four corners of the chassis 42 so as to be raised, and positioning projections 47 to 5 are formed on each of these.
0 is erected, mounting holes 53 to 56 are formed at four corners of the printed board 41, and the positioning projections 47 to 50 of the chassis 42 are respectively attached to the mounting holes 53 to 56 of the printed board 41. When the printed circuit board 41 and the chassis 42 are engaged with each other,
Positioned by 7-50 and fixed pieces 43-4
6 is to be supported.

[0003]

However, in such a conventional wiring board assembling structure, the chassis 4 is used.
Since the printed circuit board 41 is attached to the main body of the apparatus via the chassis 2, the number of parts is increased due to the need of the chassis 42, and further processing of the fixing pieces 43 to 46 and provision of the positioning projections 47 to 48 are performed. Considering the cost, there is a problem that the cost is significantly increased.

Further, since the projections and the holes are fitted at four places, a high degree of accuracy between the mutual positions is required so that the four places can be fitted smoothly. Furthermore, once the printed circuit board 41 is positioned by fitting at four positions, it is not allowed to change the position of the printed circuit board 41 in any direction, and even a slight adjustment of the position becomes impossible. There is.

Therefore, the present invention can significantly reduce the cost as compared with the prior art, does not require the high precision of the prior art, and can adjust the position to some extent even after the printed circuit board is attached. It is an object of the present invention to provide an assembly structure of.

[0006]

In order to solve the above-mentioned problems, the present invention provides a convex portion at a position higher than the bottom plate in the substantially central portion of the bottom plate of the apparatus main body on which the wiring substrate is provided, and substantially centrally the wiring substrate. It is characterized in that the wiring board is attached to the apparatus main body by providing a hole in the portion and fitting the hole in the convex portion.

According to the wiring board assembling structure having such a configuration, a convex portion is directly provided on the bottom plate of the apparatus main body, and a substantially central hole of the wiring board is fitted into the convex portion to position the wiring substrate. Therefore, the chassis used in the conventional wiring board assembling structure is unnecessary. For this reason, the number of parts is reduced, and it is not necessary to process the fixing piece portion of the chassis which is no longer needed or to provide a positioning projection, so that the cost can be significantly reduced as compared with the conventional case.

Further, since it is only necessary to fit the convex portion and the hole at one central portion, it is not necessary to have high precision between mutual positions as in the conventional case where all four portions are fitted.
Furthermore, the mounting can be done simply by fitting the protrusions and holes in one place, so the wiring board can rotate around that one place even after mounting, and some adjustment of the position can be made even after mounting the wiring board. Is possible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an assembly structure of a wiring board according to a first embodiment of the present invention.

In FIG. 1, a printed wiring board 5 is provided in a casing 3 of a main body 1 of an electronic device or the like.
A hole 7 is formed at an approximately central portion of the printed wiring board 5. In the substantially central portion of the bottom plate 10 of the casing 3,
A conical projection 12 as shown in FIGS. 2 and 3 is formed, and a convex portion 13 is formed on the top of the conical projection 12. The conical projection 12 can be formed so as to rise conically from the bottom surface by subjecting the bottom plate 10 to sheet metal drawing.

The assembly structure of the wiring board having such a structure is as follows.
Convex protrusions 13 on the top of the conical protrusion 12 formed on the bottom plate 10.
By fitting the hole 7 of the printed wiring board 5 to
The printed wiring board 5 can be attached to the casing 3 of the apparatus main body 1 to position and support the printed wiring board 5.

Therefore, the chassis used in the conventional wiring board assembly structure is not required. As a result, the number of parts can be reduced, and it is not necessary to process the fixing piece portion of the chassis that is no longer needed or to provide a positioning protrusion, so that the cost can be significantly reduced compared to the conventional case.

Further, since it is only necessary to fit the convex portion and the hole at one central portion, it is not necessary to have high precision between mutual positions as in the case where all four portions are fitted as in the conventional case.
Furthermore, since the mounting can be done by fitting the protrusion and the hole at one place, the printed wiring board 5 can be rotated about the one place even after the mounting, and even after the mounting of the printed wiring board 5, the printed wiring board 5 can be slightly rotated. The position of can be adjusted.

Further, as shown in FIGS. 2 and 4, other parts can be inserted into the side surface of the printed wiring board 5, and for example, the concave portion 14a at the side of the part 14 previously attached to the apparatus main body 1 can be inserted. The edge portions of the printed wiring board 5 can be fitted and connected to each other, and the mutual attachment strength can be improved.

Furthermore, after the printed wiring board 5 is mounted, the mounting position is finally determined by adjusting the mounting position slightly, etc., and then a tapping screw having a head in the shaft hole 13a of the convex portion 13 shown in FIG. By screwing a fastening member (not shown), the tapping screw is screwed into the shaft hole 13a while cutting the female screw with rotation. Then, in the final tightening stage of the screwing, the head of the tapping screw sandwiches and presses the printed wiring board 5 with the shoulder portion 12a of the conical projection 12, thereby finally fixing the printed wiring board 5. can do. Further, even after the printed wiring board 5 is fixed, another component (for example, the component 14) can be attached to the side surface.

In the above embodiment, the case where the printed wiring board 5 is mounted has been described, but it goes without saying that the present invention can be applied to wiring boards of types other than the printed wiring board 5 and manufacturing methods.

Further, in the above embodiment, the convex portion 13
The tapping screw was screwed into the shaft hole 13a of
The screw may be preliminarily cut in 3a and a normal screw may be screwed therein.

[0018]

As described above, according to the present invention, the bottom plate of the main body of the apparatus is provided with the convex portion directly, and the central portion of the wiring substrate is fitted into the convex portion to position the wiring substrate. Since it can be supported, the chassis used in the conventional wiring board assembly structure is not required. For this reason, the number of parts is reduced, and it is not necessary to process the fixing piece portion of the chassis which is no longer needed or to provide a positioning projection, so that the cost can be significantly reduced as compared with the conventional case.

Further, since it is only necessary to fit the convex portion and the hole at one central portion to each other, it is not necessary to have high precision between mutual positions as in the case where all four portions are fitted as in the conventional case.
Furthermore, the mounting can be done simply by fitting the protrusions and holes in one place, so the wiring board can rotate around that one place even after mounting, and some adjustment of the position can be made even after mounting the wiring board. Is possible.

[Brief description of drawings]

FIG. 1 is an internal plan view of a device body 1 relating to a wiring board assembly structure according to a first embodiment of the present invention.

2 is a cross-sectional side view passing through the center of a convex portion 13 of the apparatus body 1 shown in FIG.

FIG. 3 is an enlarged sectional view of a conical projection 12 and a convex portion 13.

FIG. 4 is a partial enlarged cross-sectional view showing a mounting relationship between the printed wiring board 5 and the component 14.

FIG. 5 is an exploded perspective view showing a conventional wiring board assembly structure.

[Explanation of symbols]

 1 Device Main Body 3 Casing 5 Printed Wiring Board 7 Hole 10 Bottom Plate 12 Conical Protrusion 12a Shoulder 13 Convex 13a Shaft Hole 14 Component 14a Recess 41 Printed Circuit Board 42 Chassis 43-46 Fixing Piece 47-50 Positioning Protrusion 53-56 Mounting Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kanji Sataya 2-14-9 Tamagawadai, Setagaya-ku, Tokyo Kyocera Corporation Tokyo Yoga Works

Claims (3)

[Claims] 1. A convex portion is provided at a position higher than the bottom plate in a substantially central portion of a bottom plate of an apparatus main body on which a wiring board is provided, a hole is provided in a substantially central portion of the wiring board, and the hole is fitted into the convex portion. An assembly structure of a wiring board, wherein the wiring board is attached to the apparatus main body by doing so. 2. The conical projection is formed by drawing so that the bottom plate of the apparatus main body rises in a substantially conical shape, and the convex portion is formed on the top of the conical projection.
The wiring board assembly structure according to. 3. The wiring board assembly according to claim 1, wherein the fastening member presses and fixes the wiring board by fastening a fastening member to the convex portion. Construction.