JPS61254885A - Electronic circuit unit for electronic wristwatch - Google Patents

Abstract

PURPOSE:To stabilize the quality and to improve the fixing force of circuit substrate fixing works, by providing plural claws for fixing a circuit substrate on a metallic plate for reinforcing the circuit substrate under a condition where the claws are united with the metallic plate in one body and making the width of the tip of each claw narrower than that of the base. CONSTITUTION:In an electronic circuit unit for electronic watch, which is composed of a semiconductor integrated circuit element, crystal oscillator, and metallic plate 2 which is used for reinforcing or ornamenting a circuit substrate 1 carrying a capacitor element, etc., and made of a high polymer material, the metallic plate 2 has plural clicks 3 formed at the outer peripheral part of the metallic plated under conditions where the claws 3 are united with the metallic plate 2 in one body. The clicks 3 are caused to stand from the metallic plate 2 at almost right angles and the width of the tip section 5 of each click 3 is made narrower than that of the base section 4. The clicks 3 are bent so as to embrace the circuit substrate 1 and the circuit substrate 1 is fixed to the metallic plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of a two-knit lightning circuit for an electronic wristwatch.

[Summary of the invention]

The present invention relates to an electronic circuit unit for a crystal oscillation type electronic wristwatch, which is composed of a circuit board made of a polymer material and a metal plate used to reinforce or decorate the circuit board. A plurality of fixing claws are integrally constructed, and by making the tips of the claws narrower than the base, the quality of the circuit board fixing work is stabilized and the fixing force is improved.

[Conventional technology]

The structure of a conventional electronic circuit unit for an electronic wristwatch is as shown in FIG. In FIG. 2 (&), the circuit element IO
A metal plate 12'ft is attached to the circuit board 1 on which the metal plate 12'ft is mounted: A claw 13 formed integrally with the metal plate 12 is bent and fixed so as to hold the circuit board from the outside so as to be in close contact with the circuit board 1. ing.

Figure 2(b) and Figure 2(c) are enlarged perspective views of the claw 130 portion, Figure 2(1,) is before the claw is bent, and Figure 2(0) is the circuit board after the claw is bent. Each figure shows how they are fixed. As is clear from this figure, the shape of the claw 13 forming the structure of the electronic circuit unit for an electronic wristwatch is as follows.
It was simply rectangular in shape.

[Problem that the invention seeks to solve]

However, the above-mentioned prior art has the problem that the claws 13 cannot be fully pressed against the circuit board l due to the springback of the metal claws or depending on the shape of the bending chisel, which tends to result in insufficient fixing force. Fig. 3 is a cross-sectional view showing this situation, and Fig. 3 (,) shows a view just before the claw 13 is about to be bent, with the special chisel 7 pressed down from above. ,nail,
Each chisel moves according to the arrow. the result,
As shown in Figure 3(b), the chisel 7 is lowered and the bending is done by force;
Complete. However, in the chisel shape shown in this figure, the tips 1B of the claws do not reach the circuit board 1, resulting in poor fixation.

Even if the shape of the chisel is improved so that the tips 15 of the claws can be pressed directly, since the claws are made of metal, the springback will cause the fixing force to be very small, or the chisel will float away from the circuit board with a gap 16. Put it away.

The present invention is intended to solve these problems, and its purpose is to provide an electronic circuit unit for an electronic wristwatch, which has a structure in which a circuit board and a metal plate are connected to each other with a completely stable fixing force. It's there to provide.

[Means for solving problems]

The electronic circuit unit for an electronic wristwatch according to the present invention includes a circuit board and a metal plate used for reinforcing or decorating the circuit board, and the metal plate has a plurality of suitable shapes integrated with the metal plate on the outer periphery. The claw has a long claw, and the claw stands up at a substantially right angle to the metal plate, and the width of the tip of the claw is smaller than the width of the base, and the claw holds the circuit board. It is characterized in that the metal plate and the circuit board are fixed to each other by bending the metal plate so that the metal plate and the circuit board fit together.

〔Example〕

FIG. 1 is an enlarged perspective view of a claw portion in an embodiment of the present invention, and FIG.
Figure (b) is a rough view after folding. The width of the tip 5 of the claw 3 is gradually smaller than that of the base 4. The operation of this embodiment will be explained on a trial basis with reference to FIG. Fourth
Figures (-) are cross-sectional views showing how the chisel is being pushed down in order to bend the claws, and Figure 4 (b) is a cross-sectional view showing the glasses being pushed down completely. , when it comes into contact with the claw 3, the tip of the narrow claw first bends along the curvature of the chisel 7 because its strength is weak, and as the width of the claw gradually increases and its strength increases, the chisel is pushed down and bent. The curvature of the claw increases, and finally the part near the base of the claw comes into contact with the chisel and pushes down the claw, and the tip 5 of the claw presses the circuit board 1, fixing the circuit board and the metal plate to each other.

FIG. 5 is an enlarged perspective view of the claw portion of another embodiment of the present invention. Figure 5 (&) is before bending the nail, Figure 5 (b)
2A and 2B respectively show how the circuit board l is fixed by bending the claws 23. According to this embodiment, the claw is composed of two stages, the narrow part 25 and the wide part 24. It has the same effect as Figure 1).

〔Effect of the invention〕

As described above, according to the present invention, the tip of the nail is bent with a deeper curvature than the other parts, so even if the bending angle of the base of the nail 3 is the same as that of the conventional example (Fig. 3), The tip of the claw has the effect of being able to hold down the circuit board with an appropriate fixing force. In addition, parts bent with deep curvature will undergo work hardening due to processing distortion,
The spring part of the claw is therefore shorter, and the amount of springback is also reduced. Therefore, even with the same pressing amount as in the conventional glasses, lifting due to spring pads and claws is less likely to occur, an appropriate fixing force can be obtained with a lighter chisel pressing force than in the conventional method, and workability is improved.

[Brief explanation of drawings]

Figure 1 (Xu is an enlarged perspective view of the main part of the electronic circuit unit for an electronic wristwatch of the present invention before the claw part is bent. Figure 1 (b) is the figure after the claw of Figure 1 (a) is bent. An enlarged perspective view of the main parts. Fig. 2 (a) is a perspective view showing the structure of a conventional electronic circuit unit for an electronic wristwatch. Fig. 2 (1,) shows the main part before bending the claw part of Fig. Fig. 2 ((+) is an enlarged perspective view of the main part of Fig. 2 (1,) after folding the claw part and postmortem. Fig. 3 (,) and Fig. 3 (1,) are A sectional view showing the state of the conventional claw part bending work〇 Fig. 4(&) and Fig. 4(b) are sectional views showing the state of the claw part bending work of the present invention. , FIG. 5(b) is an enlarged perspective view of the main part showing another embodiment of the present invention, and FIG.
Figure (b) shows the state after the nails are bent. 1. Circuit board 2.12, 22. Metal plate 3, 13.23. Nail 4.24. Base of nail 5.15, 25. Tip of the claw 7, chisel 10, circuit element 16, more than the gap

Claims (1)

[Claims] An electronic circuit unit for an electronic wristwatch comprising a circuit board made of a polymer material on which a semiconductor integrated circuit element, a crystal oscillator, a capacitor element, etc. are mounted, and a metal plate used for reinforcing or decorating the circuit board. The metal plate has a plurality of moderately long claws integral with the metal plate on the outer periphery, the claws rising from the metal plate at a substantially right angle, and the width of the tip of the claw is smaller than the width of the base. has become,
An electronic circuit unit for an electronic wristwatch, characterized in that the metal plate and the circuit board are fixed to each other by bending the claws so as to hold the circuit board.