JP2600099Y2 - Antistatic shield structure of electronic watch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic shield structure of an electronic wristwatch.

[0002]

2. Description of the Related Art In recent wrist watches, a movement which is constituted by a plastic base plate and a receiver is accommodated in a plastic exterior, thereby increasing the number of wrist watches which can cope with low prices and diversification of designs. By the way, in a movement composed of a plastic base plate and a receiver, an IC mounted on a circuit block has a structure surrounded by plastic parts. For this reason, these plastic parts are easily charged with static electricity. Further, in the case of using a plastic exterior, not only the base plate and the receiver, but also the exterior is charged.

[0003]

However, there is a disadvantage that the IC malfunctions while being carried due to the influence of static electricity charged on the plastic parts and the plastic exterior. In a multifunction timepiece with a microcomputer IC, such as a chronograph or an alarm, this malfunction is fatal.

[0004] An object of the present invention is to solve the above-mentioned problem, and to provide a structure for improving the antistatic property of a conventional electronic wristwatch.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a plastic base plate and an IC mounted on a circuit block arranged on the top surface of the base plate.
In a movement of an electronic wristwatch constituted by a battery serving as a power source of the IC, a metal back plate arranged in a lower surface direction of the base plate, and a connecting means for conducting the back plate and the battery are provided. It is characterized by having been provided.

[0006]

[Function] The antistatic structure of the present invention has a back plate which is electrically connected to the battery in the direction of the dial, so that the static electricity charged on the plastic exterior is less likely to affect the IC. The structure is such that charging is reduced and static resistance is improved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a sectional view showing one embodiment of the present invention. The circuit block 1 includes a printed circuit board 1b on which an IC 1a driven by a battery 5 is mounted. Reference numeral 2 denotes a main plate made of plastic. Reference numeral 3 denotes a battery pushing plate made of a metal that fixes the circuit block 1 to the ground plate 2 and also serves as an electrostatic shield in the direction of the back cover 9 of the circuit block 1, and partially presses the battery 5 to conduct electricity. Pressing part 3a
have. Reference numeral 4 denotes a metal back plate that performs electrostatic shielding in the direction of the dial 7 of the base plate 2. A part of the back plate 4 has a spring portion 4a for pressing and contacting the battery pushing plate 3 and a column 2a for attaching a screw for fixing the battery pushing plate 3 to the base plate 2 to conduct electricity.
The dial 7 rests on the back plate 4. The movement is surrounded by an outer case 8, a back cover 9 and a windshield 10 made of plastic. Reference numeral 6 denotes a screw for fixing the back cover 9, and reference numeral 11 denotes a crown. The spring portion 4a may not be integral with the back plate 4, and there is a method of connecting the back plate 4 and the battery pushing plate 3 with another spring component or a screw.

Since the IC 1a is in the shadow of the back plate 4 and further sandwiched between the battery pushing plates 3, the IC 1a is hardly affected by static electricity charged on the windshield 10 and the back cover 9. . The back plate 4 described above is, for example,
In the case of a watch with a hanger, the date plate holder performs its function.
You can use it as a substitute for a plain watch.
Alternatively, a metal plate member dedicated to the electrostatic shield may be provided.

[0009]

As is apparent from the above description, according to the present invention, a movement composed of a plastic base plate is electrostatically shielded from both upper and lower sides by metal parts having the same electrode, thereby achieving a movement state. Even as it is
In addition, even when the electronic wristwatch is housed in an exterior, static electricity resistance is improved, and an electronic wristwatch with higher reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electronic wristwatch showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit block 1a IC 1b Printed circuit board 2 Ground plate 3 Battery pushing plate 3a Pushing portion 4 Back plate 4a Spring portion 5 Battery 6 Screw 7 Dial plate 8 Body 9 Back cover 10 Windshield 11 Crown

Claims (1)

(57) [Scope of request for utility model registration] 1. A movement of an electronic wristwatch comprising a plastic base plate, an IC mounted on a circuit block arranged in the direction of the top surface of the base plate, and a battery serving as a power supply for the IC, An anti-static shield structure for an electronic timepiece, comprising: a metal back plate disposed in a lower surface direction; and connection means for electrically connecting the back plate to the battery.