JP2001099960A - Structure of electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antistatic structure having high reliability in timepiece movement composed of a base plate and a gear train acceptor formed of only plastic material and a metal intermediate acceptor arranged between the base plate and the gear train acceptor. SOLUTION: A battery clamp plate 9 having a spring part 9a in elastic contact with a battery 10 and a magnetic shield plate 15 are electrically connected each other through a tube 12 press fitted into a stage hole 1a of a base plate 1 and fixed, a battery clamp plate set screw 11 screwed in the vertical direction of the tube 12, and a magnetic shield plate set screw 17. On the other hand, an intermediate acceptor 3 and the magnetic shield plate 15 are electrically connected with each other through a tube 14 press-fitted into a stage hole 1b of the base plate 1 and fixed, a battery clamp plate set screw 13 screwed in the vertical direction of the tube 14, and a magnetic shield plate set screw 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countermeasure against static electricity in a watch movement using a plastic material for a base plate and a train wheel bridge, and relates to a metal supporting a plurality of train wheels such as a train wheel at the center of a watch. The present invention relates to a timepiece movement in which an inner support made of a material is electrically connected to an anode of a battery.

[0002]

2. Description of the Related Art Generally, a timepiece movement requires an antistatic structure in order to prevent a built-in IC chip from malfunctioning or being destroyed by an electrostatic discharge caused by an external environment. It is.

Conventionally, as a countermeasure against static electricity charged to a timepiece movement, an earth spring part is provided in advance on a metal battery pressing plate provided with a spring part for holding a battery, and a watch case is provided. It is a conventional standard method to bring the earth spring portion into contact with a metal back cover or the like which constitutes the above, and it is a conventional and widely used structure.

However, in recent years, the clock movement has become multi-functional, and various functions have been added to ICs in accordance with the clock specifications, and it has become a more important issue to prevent malfunction of the IC. . In addition, as the number of functions has increased and the cost of the watch movement has been reduced, plastic materials that are easily charged have been used for the base plate, wheel train receiver, wheel train, etc., so consideration for static electricity is even more important. became.

Accordingly, in a structure in which the inside of the timepiece movement is covered with a metal base plate, a train wheel support, a battery pushing plate, etc., a measure against static electricity can be taken to some extent by conventional measures. In the case of a watch movement using low-conductivity plastic materials for the train wheel bridge or train wheel, static electricity easily accumulates inside the watch movement, and the conventional anti-static structure alone has sufficient reliability. Was not obtained.

Therefore, a highly reliable countermeasure structure against a static electricity of a watch movement called a so-called pla-module has been desired. For example, Japanese Patent Publication No. 63-9630 describes a timepiece structure in which a plastic material is used for the main plate and the overall support, and a center support is disposed between the main plate and the overall support.

[0007]

However, in the above structure, a plastic material is used for each of the base plate and the receiving plate. However, a metal plate is inserted in the plastic portion, and only the plastic material is used as the material. Unlike previously formed structures, such components have poor productivity and are costly. Further, the second receiving member disposed between the main plate and the total receiving member has a structure in which the engaging portion 6-g is engaged with the receiving legs 17, 18 erected on the main plate. The guard is not configured to reliably conduct electricity from the anode part of the battery via the overall catch and the base plate, and no mention is made of the conductivity. Therefore, since the second receiver is not conductive, the second receiver is easily charged and has a structure easily affected by static electricity.

An object of the present invention is to solve the above problems and to provide a highly reliable antistatic structure in a timepiece movement using only a plastic material for a main plate and a train wheel bridge.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a base plate and a train wheel bridge formed of only plastic material, and a base plate and a train wheel bridge disposed between the base plate and the train wheel bridge. In a timepiece movement including an inner support made of a metal material, a battery, and a metal battery pushing plate for holding the battery,
The intermediate support is electrically connected to the anode of the battery via a battery pushing plate holding the anode of the battery. Further, the battery pressing plate has a contact spring, and the contact spring is in direct contact with the inner support.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of an analog electronic timepiece movement showing an embodiment of the present invention, and FIG. 2 is a sectional view of the analog electronic timepiece movement shown in FIG.

In the figure, 1 is a base plate made of only plastic material, 2 is a train wheel receiver similarly made of only plastic material, and 3 is a gear train of the base plate 1 and the train train receiver 2. It is a metal support placed between the metal materials,
A plurality of wheel trains such as a second wheel 4, a fourth wheel 5, a minute wheel 6 and the like are supported by the main plate 1, the wheel train 2, and the middle wheel 3. In FIG. 1, reference numerals 20, 21, and 22 denote a plurality of converters provided with coils. The converters 20, 21, and 22 use the second wheel 4, the fourth wheel 5, the minute wheel 6, etc. Wheel train and other wheel train 2
3, 24 are driven.

A circuit board 8 on which an IC chip 7 is mounted and a battery pushing plate 9 are disposed on the upper side of the train wheel bridge 2 and the base plate 1. The battery pushing plate 9 is electrically connected to a Vdd pattern (not shown) of the circuit board 8. The spring portion 9a of the battery pressing plate 9 is in elastic contact with and electrically connected to the anode portion 10a on the upper surface of the battery 10, and the battery pressing plate 9 constitutes a watch case similar to the conventional case. Metal cover member 19
And an earth spring portion 9b which makes elastic contact with the spring.

Reference numeral 11 denotes a battery pressing plate fixing screw serving as a fastening member, which is screwed to a tube 12 press-fitted and fixed to the step hole 1a of the base plate 1 with the battery pressing plate 9 and the circuit board 8 interposed therebetween. I have. The center support 3 is screwed to a tube 14 press-fitted and fixed to the step hole 1b of the base plate by a center support screw 13 as a fastening member, and is fixed to the upper surface side of the base plate 1. Reference numeral 15 denotes an anti-magnetic plate which also serves as an hour wheel pusher disposed on the lower surface side of the main plate 1, and presses an hour wheel 16 disposed on the lower surface side of the main plate 1. The anti-magnetic plate 15 is screwed to the tubes 12, 14 by anti-magnetic plate set screws 17, 18, which are fastening members, and is fixed to the lower surface of the base plate 1.

Accordingly, the battery pusher plate 9 and the air-resistant magnetic plate 15 having the spring portion 9a elastically contacting the battery 10 are connected to the tube fixedly pressed into the step hole 1a of the base plate 1.
The battery 12 is electrically connected to the battery 12 through a screw 11 for fixing the battery pressing plate and a screw 17 for the anti-magnetic plate, which are screwed from above and below the tube 12, while the inner support 3 and the anti-magnetic plate 15 are connected to each other. The tube is press-fitted and fixed in the step hole 1b of the base plate 1.
The battery 14 is electrically connected to the battery 14 via a battery pushing screw 13 and a magnetic plate screw 18 which are screwed from above and below the tube 14.

That is, the earth spring portion 9b of the battery pushing plate 9 is brought into elastic contact with the metal lid member 19, and only the plastic material is used as the base plate 1 made of only the plastic material. Since the metal support 3 arranged between the formed train wheel support 2 and the battery pusher plate 9 is connected to the battery pusher plate 9 via the anti-magnetic plate 15 and the like, the electrostatic discharge from the outside of the watch causes an electrostatic discharge. The static electricity generated inside the timepiece movement is discharged to the human body through the earth spring 9b via the middle support 3, the magnetic-resistant plate 15, and the battery pressing plate 9 which are conducted to each other, via the lid member 19, and to the human body side. I can do it.

In the above-described embodiment, the connection structure between the battery pressing plate and the intermediate support is connected via a member such as a magnetic-resistant plate, but the present invention is not limited to this. If the space can be secured, a contact spring 9c is provided on the battery pushing plate as shown by a dotted line in FIG.
The connection may be made by elastic contact with the upper surface of the middle support 3.

[0017]

As described above, according to the present invention, in a timepiece movement using a base plate and a train wheel bridge made only of plastic material, the clock plate provided on the battery pushing plate as in the prior art. Contacting the spring part with the cover member of the watch case to take an earth, and furthermore, electrically connecting the middle support of the metal material disposed between the main plate and the train wheel support to the anode part of the battery; Since the inner support also has an electrostatic shielding effect, the static electricity generated in the clock movement is transferred to the earth spring portion 9 b by the inner support 3, the anti-magnetic plate 15 and the battery pressing plate 9, which are electrically connected to each other. Through the cover member 19, the discharge can be made to the human body side. Therefore, a highly reliable static electricity countermeasure structure despite the adoption of the base plate and the train wheel bridge made of only the easily chargeable plastic material is adopted. Providing a realizable and low-cost watch movement Can.

[0018]

[Brief description of the drawings]

FIG. 1 is a plan view of an analog electronic timepiece movement showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the analog electronic timepiece movement shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground plate 2 Wheel train receiver 3 Middle receiver 8 Circuit board 9 Battery pushing plate 9b Earth spring part 11 Battery pushing plate fixing screw 12, 14 Tube 13 Middle receiving screw 15 Anti-magnetic plate 17, 18 Anti-magnetic plate fixing screw 19 Lid member

Claims (2)

[Claims] 1. A base plate and a train wheel bridge formed using only a plastic material, an inner bridge made of a metal material disposed between the ground plate and the train wheel bridge, a battery, and a battery holding device. In the case of a timepiece movement provided with a metal pushing plate made of a metal material, the intermediate support is electrically connected to the anode of the battery via a battery pushing plate holding the anode of the battery. The structure of an electronic timepiece characterized by the following. 2. The battery pressing plate according to claim 1, further comprising a contact spring, wherein the contact spring is in direct contact with the intermediate support.
Structure of the electronic watch described.