JPH11233972A - Structure for fixing printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a printed wiring board to be incorporated in an enclosure member without soldering by coupling the printed wiring board, which is positioned on the enclosure member between projections provided on the side edges of the enclosure member and coupled with the projections by bending parts of the projections toward the printed wiring board. SOLUTION: A projection 20 is composed of a vertical section 21 and a horizontal section 22 and is made into an inverted L-shape, and the horizontal section 22 is bent toward the surface of a printed wiring board 11. In the initial state in which the wiring board 11 is not incorporated, the horizontal section 22 of the projection 20 is not bent, but the whole body of the projection 20 is extended straight at right angles from the surface of the bottom wall 14 of a rear panel 13. The vertical section 21 is formed in a plate-like state having the same thickness as that of the bottom wall 14 has, and extended straight from one side edge of the bottom wall 14 at right angles to the surface of the bottom wall 14. After the wiring board 11 has been positioned on the bottom wall 14 inside the projections 20 of the rear panel 13, solder bumps are respectively aligned with the projections 20 and the board 11 is incorporated by bending the horizontal sections 22 toward the solder bumps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a printed wiring board, and more particularly to an improvement in a structure for fixing a printed wiring board to a housing member such as a housing.

[0002]

2. Description of the Related Art In an electronic device having a printed wiring board having a small area, for example, a pager (pager), the printed wiring board is incorporated into a housing member by arranging the printed wiring board on a rear panel of the housing member and mounting the printed wiring board on the rear panel. This is done by soldering certain protrusions and pads on the printed wiring board. FIG. 5 shows an example of the protrusion on the rear panel. The protrusion a is formed by cutting and raising a part of the side edge of the rear panel b at right angles to the surface of the rear panel b. A plurality of such protrusions a are provided at intervals on each of a pair of side edges of the rear panel b facing each other. The printed wiring board c is fixed by positioning the printed wiring board c inside the protrusion a, arranging the printed wiring board c on the rear panel b, and soldering the pad d and the inner surface of the protrusion a. .

[0003]

However, such a fixed structure of the printed wiring board requires not only soldering of the pad d and the protrusion b of the printed wiring board c, but also mounting the printed wiring board c on the rear panel a. Printed circuit board c
The pad d and the projection b of the rear panel a must be accurately aligned, which requires considerable man-hours.

[0004] The object of the present invention is to eliminate the need for soldering operations.
It is an object of the present invention to provide an improved fixing structure of a printed wiring board, in which the printed wiring board can be incorporated into a housing member.

[0005]

In order to achieve the above object, a printed wiring board fixing structure according to the present invention comprises a housing member having a projection on a side edge and a printed wiring board positioned between the projections. In the fixing structure of the printed wiring board disposed on the housing member and coupled to the projection, the connection between the printed wiring board and the projection is made by bending a part of the projection toward the printed wiring board. I have.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printed wiring board fixing structure according to the present invention will be described with reference to FIGS.

This printed wiring board fixing structure is suitable for a pager (pager), and a printed wiring board having a circuit of the pager is incorporated in a housing in the form of a thin hollow box.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a printed wiring board. The printed wiring board 11 has a core material made of a rigid sheet or a flexible sheet, similarly to this known type. Although not shown, a conductor is formed on the surface of the core, and an electronic component is mounted. The solder bumps 12 are provided on each of the longitudinal edges of the printed wiring board 11.
Two solder bumps 12 are provided on each of the longitudinal side edges of the printed wiring board 11 at an interval.

[0009] Only the rear panel 13 of the housing is shown. The rear panel 13 is formed of a press-formed metal plate made of a member having a substantially channel-shaped cross section. The rear panel 13 is disposed so as to cover the lower opening of a cover having the shape of a thin hollow box, for example. Fixed to

The rear panel itself has a flat bottom wall 14, a side wall 15 bent at a right angle from the longitudinal side edge of the bottom wall 14, and a projection 20 formed by cutting and raising a part of the longitudinal side edge of the bottom wall 14. Have. The protrusions 20 are for fixing the printed wiring board 11 to the rear panel 13 in the same manner as the conventional fixing structure, and correspond to the solder bumps 12 of the printed wiring board 11 when the printed wiring board 11 is arranged on the rear panel. Thus, it is provided on each of the longitudinal side edges of the rear panel 13.

FIG. 3 and FIG.
The details of one protrusion 20 are shown. The protrusion 20 has a substantially inverted L-shape having a vertical portion 21 and a horizontal portion 22. The horizontal portion 22 is bent toward the surface of the printed wiring board 11. This protrusion 20 is shown in FIG.
As shown in (1), in an initial state where the printed wiring board 11 is not assembled, the horizontal portion 22 is not bent, and the whole extends at a right angle from the surface of the bottom wall 14 of the rear panel 13. The vertical portion 21 has a plate shape having the same thickness as the bottom wall 14, and is provided at a side edge of the bottom wall 14 so as to extend in a direction perpendicular to the surface of the bottom wall 14. The horizontal portion 22 is a plate-shaped member having the same thickness as the vertical portion 21.
And is disposed so as to extend at right angles to the vertical portion 21 from the upper end of one side edge of the vertical portion 21 and is formed integrally with the horizontal portion 22.
The remaining protrusions 20 are similarly configured. These protrusions 2
The formation of 0 is performed, for example, by bending the protrusion 20 together with the side wall 15 when the rear panel 13 is punched by a press machine.

When the printed wiring board 11 is incorporated, the printed wiring board 11 is positioned on the bottom wall 14 inside the protrusion 20 of the rear panel 13, and each of the solder bumps 12 is made to coincide with each of the protrusions 20. , By bending the horizontal portion 22 of each protrusion 20 toward the solder bump 12. The bending of each protrusion 20 may be, for example, between the intersection of the upper edge of the horizontal portion 22 and the side edge of the vertical portion 21 and the intersection of the lower edge of the horizontal portion 22 and another side edge of the vertical portion 21. Along the folding line 23. When folded, the bent tips of the horizontal portions 22 at each protrusion 20 contact or dig into the solder bumps 12 and the printed wiring board 11
Is pressed against the bottom wall 14 of the rear panel 13 by the bent front end, and is fixed to the rear panel 13.

[0013] Even if the printed dashed plate 11 receives a force in the longitudinal direction, it does not move due to frictional contact with the rear panel 13 and the printed wiring board 11 receives a force from the rear panel side. The folded horizontal portion 22 of the projection 20 does not not only come out of the rear panel 13, but also simply folds the projection 20 toward the printed wiring board 11, so that the printed wiring board 1
Since the position fixing of the printed wiring board can be performed without any necessary soldering work in the conventional fixing structure of this kind, the fixing work of the printed wiring board can be performed quickly and easily, that is, at low cost. The bending of the protrusion 20 can be performed by an operator or by using a machine. In the latter case, the protrusion 20 can be simply bent toward the printed wiring board 11, so that automation can be easily performed. Further, the manufacture of the rear panel 13 can be performed only by changing only the protruding portion 20 of the press die, and there is no need to change the manufacturing equipment or the working process, so that the printed wiring board 11 can be easily fixed. In addition, the printed wiring board 11 can be fixed to the rear panel at extremely low cost.

[0014]

According to the printed wiring board fixing structure of the present invention, as described above, the connection between the printed wiring board and the projection is made by bending a part of the projection toward the printed wiring board. This eliminates the need for a soldering operation at all, and reduces the number of work steps, as well as simplifying the operation, thereby further reducing the cost of assembling the printed wiring board.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a printed wiring board fixing structure of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an enlarged perspective view of a part of FIG.

FIG. 4 is a diagram for explaining a process of fixing the printed wiring board.

FIG. 5 is a perspective view of a conventional fixing structure for a printed wiring board.

[Explanation of symbols]

 11 Printed wiring board 13 Housing member 20 Projection

Claims (2)

[Claims] A printed wiring board and a housing member into which the printed wiring board is incorporated, wherein the housing member has a protrusion, and the printed wiring board is located on the housing member between the protrusions;
In the fixing structure of the printed wiring board connected to the protrusion,
A fixing structure for a printed wiring board, characterized in that the connection between the printed wiring board and the protrusion is made by bending a part of the protrusion toward the printed wiring board. 2. A printed wiring board including a printed wiring board and a housing member into which the printed wiring board is incorporated, wherein the housing member has a protrusion formed by cutting and raising a part of a side edge, and the printed wiring board is positioned between the protrusions. In the fixing structure of the printed wiring board, which is disposed on the housing member and is coupled to the projection, a vertical portion in which the projection extends upward from the surface of the printed wiring board, and a printed wiring from an end of the vertical portion. A fixed structure for a printed wiring board, comprising: a horizontal portion extending parallel to a surface of the board, wherein the horizontal portion is bent toward the printed wiring board.