JPS5910691Y2 - Battery lead plate support structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a support structure for battery lead plates.

The purpose of the present invention is to increase the substantial spring length of the battery lead plate.

Another object of the present invention is to simplify the fixing part and reduce the space of the fixing part by providing a support structure that does not directly transmit the reaction force of the battery lead plate to the fixed end.

Another object of the present invention is to reduce costs by simplifying the fixing part.

Needless to say, when making a watch smaller, it is easier to use a smaller battery.

However, when a small battery is used, it is difficult to ensure a sufficient spring length for a member that contacts the battery and supplies power supply voltage to the electronic circuit, and problems are likely to occur due to plastic deformation of the spring or excessive contact pressure.

The present invention solves these problems by increasing the effective length of the spring, thereby making it possible to realize a small portable crystal watch.

A detailed explanation will be given below according to the drawings.

FIG. 1 is a sectional view showing an example of a conventional battery lead plate.

In Figure 1, 1 is the battery, 2 is the battery lead plate, 3 is the battery insulation frame, 4 is the plate, 5 is the pusher, 6 is the screw, 7 is the lead plate, 8 is the lead pin, and 9 is the circuit case. There is.

As is clear from the figure, the battery lead plate 2 and the lead plate 7 are provided with holes through which the lead pins 8 pass.

When the battery is set, the battery lead plate 2 forms a cantilever beam and contacts the battery at the contact point 2a, supplying power to the electronic circuit via the lead pin 8.

In such a structure, the lead pins 8 and the circuit case 9 receive the reaction force generated by the bending of the battery lead plate 2, so that a force is always applied to the circuit case 9, causing distortion.

Therefore, tensile and compressive loads are likely to be applied to electronic circuit components, and placement, fixing, conduction methods, etc. are limited.

Furthermore, since the lead pin 8 must also have a structure that can withstand a large load, a large space is required, and this is not suitable for downsizing the watch.

Furthermore, as the diameter of the battery becomes smaller, the length of the battery lead plate 2 also becomes shorter, making it impossible to provide a sufficient spring length.

Therefore, in the battery lead plate 2, the stress becomes excessive at the portion 2b closest to the supporting part, which tends to cause plastic deformation, and the contact pressure acting on the contact point 2a also tends to become excessive, making it difficult to use small batteries. There were many problems.

The present invention solves these problems and provides a battery lead plate support structure suitable for small batteries, an embodiment of which is shown in FIG.

FIG. 3 is a sectional view taken along line A'-A'.

In Figures 2 and 3, 1 is a battery, 2 is a battery lead plate, 3 is a battery insulation frame, 4 is a base plate, 6 is a screw, 7 is a lead plate, 9 is a circuit case, 9a is a thermal caulking, 10 is a screw pin.

Here, the battery lead plate 2 has a tongue shape in which the pressing contact part with the battery terminal has a large angle with respect to the base plate as shown in 2e, and one end 2f is fixed to the circuit case 9 by heat caulking 9a. An intermediate portion 2d, which is located between the contact 2a and the fixed portion 2f and is almost parallel to the base plate, is sandwiched between the circuit case 9 and the battery insulating frame 3 with a certain gap from above and below.

Further, a falling portion is formed from the end of the intermediate portion 2d to the bent portion 2C, which is the contact portion with the battery insulating frame 3, and is inclined toward the side opposite to the pressing contact portion 2e.

When the battery is set, the battery lead plate 2 contacts the battery insulating frame at the bent portion 2C, is pressed against the circuit case at the intermediate portion 2d, and receives a reaction force at these two locations.

To explain this state in detail, from the time when the bent portion 2C comes into contact with the battery insulating frame 3 due to insertion of the battery, a large clockwise torque is generated in the inclined falling portion 2b of the battery lead plate.

This torque causes the bent portion 2 in contact with the battery insulation frame 3 to
C slides toward the screw pin 10, and the intermediate portion 2d is lifted toward the circuit case 9 side.

As a result, the battery node plate 2 is connected to the battery insulating frame 3 at the bent portion 2C.
, and a part of the intermediate portion 2d is in contact with the circuit case, and the clockwise torque of the falling portion 2b is applied to the battery insulation frame 3.
and supported by the circuit case.

When there is a gap between parts 2C and 2d of the battery lead plate and the battery insulating frame and circuit case, the battery lead plate 2 is a cantilever beam with the thermal caulking 9a as the fixed end, and the spring length is sufficient. It is possible to make it longer.

Therefore, the load applied to the fixed end is small, and the strength is sufficient even with simple measures such as heat sealing, thereby reducing space and cost.

In addition, since the part of the circuit case that receives a large reaction force is fixed to the base plate with screws 6, no excessive external force is applied to the circuit case, and there is no need to worry about deformation or distortion. The effects of the present invention are significant, such as the placement not being restricted by strength.

Next, FIG. 4 shows the relationship between the amount of deflection applied to the contact point 2a of the battery lead plate 2 and the contact load.

In FIG. 4, 11 is an example of the characteristics of the battery lead plate according to the present invention, and 12 is an example of a conventional battery lead plate.

11a is a state in which there is a gap between parts 2C and 2d of the battery lead plate in Figure 3, the battery insulation frame 3, and the circuit case 9, 1l b
indicates that the battery lead plate is bent and the gap is clogged.

11a has a long spring length as described above, so the contact load can be reduced and no plastic deformation occurs.

Since the actual spring length of 1l b becomes shorter, the spring constant becomes larger and plastic deformation is likely to occur, but the amount of deflection 11 corresponding to the part 11 a that is not plastically deformed is still
C can be guaranteed.

In addition, for the same amount of deflection, the contact load of the battery lead plate according to the present invention can be suppressed to be smaller than that of the conventional one, eliminating the disadvantages caused by not being able to obtain a sufficient spring length.
This made it possible to create a portable crystal clock using a small battery.

In addition, as an example, an example was explained in which the battery lead plates were sandwiched with a certain gap, but it is also possible to sandwich the battery lead plates tightly together without any gaps using elastic materials such as relatively soft plastic or rubber. However, the effects of the present invention will not change even if they are sandwiched between elastic materials with a certain gap between them.

[Brief explanation of the drawing]

Fig. 1: A sectional view showing a conventional example, Fig. 2: A plan view showing an embodiment of the present invention, Fig. 3; A sectional view of the embodiment shown in Fig. 2, Fig. 4; Fig. 3. Characteristic diagram of battery lead plate. DESCRIPTION OF SYMBOLS 1...Battery, 2...Battery lead plate, 3...Battery insulation frame, 4...Main plate, 5...Push, 6...Screw, 7...Lead plate, 8... - Lead pin, 9... Circuit case, 10... Screw pin, 11... An example of the characteristics of the battery lead plate according to the present invention, 12... An example of the characteristics of the conventional battery lead plate.

Claims (1)

[Scope of utility model registration request] In an electronic watch having a button-type battery arranged so that the axis edge is perpendicular to the circuit board, the plate-shaped elastic lead plate 2 connecting the battery and the circuit includes a fixing part 2f fixed to the circuit board; A tongue-shaped pressing contact portion 2e that is tilted with respect to the base plate and pressed in the battery axial direction when the battery is inserted; a bent portion 2C that is provided continuously to the press contact portion 2e and contacts an insulating member on the base plate surface; an intermediate portion 2d located between the fixed portion 2f and the bent portion 2C and substantially parallel to the base plate sandwiched by a circuit board on the upper side of the elastic lead plate and an insulating member on the lower base plate surface with a gap; middle part 2d
from one end to the bending portion 2C and the pressing contact portion 2e.
When the battery is inserted, the elastic lead plate generates rotational torque in the falling part 2b centering on the bent part 2C. At the same time, the bent portion 2C slides on the insulating member, and the intermediate portion 2d is lifted toward the circuit board, and the gap between the circuit board and the insulating member facing the intermediate portion 2d is The battery lead plate is set such that at least the intermediate portion 2d lifted by the insertion of the battery comes into contact with the battery lead plate, and a screw pin for connecting the circuit board and the ground plate is arranged near the intermediate portion 2d. supporting structure.