JPS6028018Y2 - Watch switch structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to the structure of a switch section of a wristwatch, and more specifically to the structure of a switch section of a digital wristwatch.

An object of the present invention is to simplify the structure and improve the reliability of the switch section.

Other objects of the present invention are to reduce costs and improve after-sales service by simplifying the structure.

In the past, the switch parts of watches in particular were designed to the limit because they could not take up enough space due to the miniaturization and thinning of watches, that is, they were designed at the limit of the number of times they could be used.
It was secured with a screw so that it could be replaced.

A detailed explanation will be given below with reference to the drawings.

FIG. 1 is a diagram showing the structure of a conventional switch section, in which a switch spring 1 is connected to a pin 2. It is positioned by screw pins 3 and fixed by screws 4.

The pin 2 and screw pin 3 are driven into the base plate 5.

Although the button pressing portion 6 of the switch spring 1 is pressed in a direction perpendicular to the page with an external operating member (not shown), it comes into contact with the switch pin 7.

The switch pin 7 is fixed by a stopper seat 11 via an insulating bushing 8 and a printed wiring board 10 having a copper foil pattern 9.

The copper foil pattern 9 that is electrically connected to the switch pin 7 is connected to a circuit (not shown) and is normally open, but when it comes into contact with the switch spring 1, it becomes the same potential as the ground plane and operates as a switch.

Although not shown, the ground plate is connected to a circuit via pins or the like.

As mentioned above, during assembly, the switch spring 1 was inserted into the guide pin and secured with a screw, so it was difficult to insert the screw 4 into the screw pin 3 and tighten the screw, which made assembly difficult.

This also worsened after-sales service.

Further, since the switch spring 1 is fixed on the base plate and the position where the spring tip contacts the switch pin 7 is determined, bending control in manufacturing the switch spring parts is important, making the parts difficult to manufacture.

In other words, a small angular error in the bending of the switch spring fixing part increases 1 (spring length) in order to provide spring properties, so the value becomes large at the tip, resulting in poor contact between the switch spring and the switch pin. Sometimes, the switch is in a position where it touches the stop seat, and the switch is always in the ON state.Also, the switch is operated by operating an external operating member, but the switch is not in the ON position and is pressed slightly. Sometimes the switch just works.

The present invention eliminates the above-mentioned drawbacks, and will be described in detail below with reference to the drawings.

2, 5, and 6 are diagrams showing the structure of the switch part according to the present invention, in which the fixed part of the switch spring 12 is attached to the base plate 13.
It is placed using the pins 14 and 15 driven in as a guide.

The circuit receiver 16 is placed over this, but the pin 14
．． In part 15, there is a gap between the circuit receiver 16 and the switch spring 12 to the extent that the switch spring 12 does not come out from the pins 14 and 15, and in the vicinity of the contact point of the switch spring 12, the circuit receiver 1
6 and the circuit case 18 with a slight gap between them.

The switch pin 17 is fixed to the base plate 13 by a stopper seat 21 via a circuit case 18 having an insulating bushing effect and a printed wiring board 20 having a copper foil pattern 19.

The button pressing portion 22 of the switch spring 12 is connected to the external operating member 36.
When pressed, the tip of the switch spring 12 operates while contacting either surface of the circuit receiver 16 or the circuit case 18, and contacts the switch pin 17 to operate the switch.

At this time, the switch spring 12 is generally made of metal, and the circuit receiver 1
Since the 69 circuit case 18 is molded from plastic due to its complicated shape, damage may occur due to contact.
This problem can be solved by making the contact surface of the switch spring 12 smooth, for example by slightly lengthening the barrel polishing time that was conventionally used to make it mirror-like.

Therefore, when assembling, the work is completed by assembling the switch spring 12, assembling the circuit holder 16, and fixing the circuit holder with screws, etc., which not only eliminates the work of fixing screws for fixing the spring, but also reduces the number of parts. What used to be used becomes a regular pin, reducing costs and improving after-sales service.

Furthermore, since the portion of the switch spring 12 that engages with the pin 14, 15 has play, the bending control width of the switch spring 12 is increased, making it easier to manufacture the parts.

That is, even if the height position of the spring tip differs greatly with respect to the spring guide that engages with the pin 14.15,
On the other hand, when looking at the spring guide with the spring tip as a reference, there will be a small positional deviation depending on the length ratio, and since the spring guide has play, even such a part can be used in practice.

Also, when considering the reliable operation of the switch spring,
The conventional screw fastening method had the problem of screw loosening over a long period of time, but the above-mentioned problem can be solved by using the throwing method of the present invention.

The switch spring 12 is operated between the circuit receiver 16 and the circuit case 18, but at this time, the height of the switch pin 17 must be made higher than the surface of the circuit receiver 16 that contacts the switch spring as shown in the figure. Accordingly, poor contact can be prevented.

Similarly, in the lower part, contact failure can be prevented by making the surface of the circuit case 18 that contacts the switch spring higher than the stop seat 21 by a certain value or more.

The circuit case 18 has the function of determining the initial position of the switch spring 12.

3A, B, and 4 are cross-sectional views related to the switch structure according to the present invention, and the circuit case 18 is a guide for the trimmer capacitor 23.

Insulating bushing effect of conductive pin 24, printed wiring board 20
Protection of chip capacitor 25 etc. fixed to
It has a guiding and insulating effect, and an insulating bushing effect of the negative lead plate pin 28.

The circuit receiver 16 protects the trimmer capacitor 23, protects the chip capacitor 25, holds the crystal oscillator 26 from above, and has a fixing effect to reduce the effects of falling, etc., and the battery 29.
, a stopper effect for the switch spring 12 , a protrusion 31 that holds the battery insulating plate 30 and prevents it from falling off, and an outer periphery 32 that serves as a guide for the gasket 33 and for fixing the movement.

34 is the back cover, and 35 is the body.

According to the configuration of the present application, the switch spring has a fixed part that has two loose fitting engagements of holes and protrusions between the switch spring and the base plate, and a movable part that is continuous with the fixed part and has a plane perpendicular to the base plate. In addition, the switch spring is disposed between the base plate and a receiving member such as a circuit case, and is held at least at the fixed part with a gap large enough to prevent the aforementioned holes and protrusions from coming undone, and is movable. The switch spring is held between the main plate and the receiving member with a loose gap by holding the contact point (contact part with the switch pin) with a gap large enough to prevent it from coming off the contact position of the switch pin. It has a similar effect.

a. Since the switch spring is supported by two loose fitting engagements between the switch spring and the main plate through holes and protrusions, and by clamping between the main plate and a receiving member such as a circuit case, special measures are required for fixation. Reducing the number of parts can contribute to saving space in the wristwatch.

In addition, to support the switch spring, all you have to do is match the hole in the switch spring to the protrusion on the base plate, and then insert the support member such as the circuit case, so there is no need for complicated processes such as tightening screws, making installation extremely easy. I made it.

b Since the switch spring is held between the base plate and the receiving member such as the circuit case, the main body of the component can have some extra space, which makes manufacturing easier and eliminates the need for precise position adjustment when assembling. Therefore, the present invention provides a wristwatch switch structure that is excellent in mass production.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional switch structure. FIG. 2 is a sectional view showing an embodiment of the switch structure according to the present invention. 3A, 3B, and 4 are cross-sectional views of parts related to the switch structure according to the present invention. FIG. 5 is a cross-sectional view of the button pressing portion of the switch spring in FIG. 2, taken in a cross-sectional direction perpendicular to the plane of the paper. FIG. 6 is a cross-sectional view of the switch pin portion in FIG. 2 taken at an angle of m with respect to the plane of the paper. 1... Switch spring, 2... Pin, 3
...Screw pin, 4...Screw, 5...
... Ground plate, 6 ... Button press part of switch spring 1, 7 ... Switch pin, 8 ... Insulating bushing, 9 ... Copper foil pattern , 10...
・・Printed wiring board, 11・・Stop seat, 12・
...Switch spring, 13 ... Main plate, 14
．． 15...Pin, 16...Circuit receiver, 1
7...Switch bin, 18...Circuit case, 19...Copper foil pattern, 20...
・Printed wiring board, 21... Stop seat, 22...
...Button push part of the switch spring 12.

Claims (1)

[Scope of utility model registration request] In a wristwatch switch structure having a switch spring actuated by an external operating member and a switch pin fixed to a base plate or the like and cooperating with the switch spring, the switch spring has loosely fitted holes and projections that are secured at at least two locations. a fixed part that is fixed to the base plate, and a movable part that is continuous with the fixed part and has a plane perpendicular to the base plate; The switch spring is provided with a contact point that comes into contact with the switch pin, and the switch spring is disposed between the base plate and a receiving member such as a circuit case, and the connection between the hole and the protrusion is released at least at the fixed portion. The switch pin is clamped with a gap large enough to prevent it from shifting, and the contact point at the movable part is clamped with a gap large enough to prevent the switch pin from slipping out of the contact position of the switch pin. A wristwatch switch structure, characterized in that it is configured to be held between a support member and a support member with play.