JPH04104591U - Shield structure of electronic wristwatch - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention improves the electrical shielding structure of an electronic wristwatch and improves its resistance to external electrical noise. [Structure] A metal battery press plate 2 and a dial plate 3 are placed between the watch movement base 1 made of plastic material.
In a wristwatch equipped with this, by press-contacting the hawk-shaped elastic contact portion 2a provided on the battery pressing plate 2 to the leg 3a of the dial plate which is fitted and fixed in the through hole 1a of the base 1. ,
The dial plate 3 is grounded to a power source via a battery holding plate, and the periphery of the timepiece movement, including the dial side, is completely electrically shielded. [Effect] The watch's resistance to external electrical noise has been dramatically improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a shielding structure for electronic wristwatches against electrical noise.

0002

[Conventional technology]

In recent years, watches have become more mature products, and users are becoming more and more sophisticated in line with their individual lifestyle trends. The time has come to use several watches. Along with this, there are many designs and functions. In order to respond to changes in the size and complexity of watch movements, as well as smaller and thinner watch movements, Demand for low power consumption and multi-functionality to meet the needs of more users is growing stronger. As a result, the circuits used in movements have become more complex, and while lower power consumption has progressed, , the resistance to external electrical noise tends to be weaker, and the watch's electrical shielding tends to be weaker. The field structure has become a problem.

0003 On the other hand, in order to respond to cost reduction needs, the species that make up watch movements Plastic materials are increasingly being used for various parts instead of conventional metal materials. The movement of modern electronic watches also incorporates various watch parts. Conventionally, metal materials were used for the bases used, but there are holes and shafts for mounting parts. , processing costs were high due to the complicated shape with many turning steps etc. Therefore, for the purpose of cost reduction, it can be integrally molded with a mold, and other parts can also be composited. More and more products use plastic materials, which can reduce the number of parts by reducing the number of parts. There is a tendency.

0004 The part of the clock movement that generally uses a plastic material base is shown in Figure 3. As shown in the cross-sectional view, the base 31 is made of a battery pressing plate 32 made of metal material and a copper alloy such as nickel silver material. It has a structure in which it is placed in the middle of a dial plate 33 using The legs 33a of the plate are inserted into the through holes 31a of the base 31, and the mating and fixing are performed, and the battery pressing plate is inserted. 32 is fixed to the base 31 via the circuit board 34 with screws etc. The dial plate 33 and the battery press plate 32 are electrically insulated by the base 31. It is in. Note that the part of the battery pressing plate 32 that holds down the battery (not shown) comes into contact with the battery. and is grounded to the power supply.

[0005] Next, FIG. 4 shows a cross-sectional view of a completed timepiece with a timepiece movement built into the exterior. figure 4, the clock movement 41 is secured by an inner frame 43 made of plastic material. The case 42 is fixed to a body 42 made of a metal material such as stainless steel. 2a, back cover 42b, bezel 42c, and watch glass made of hard glass made of non-conductive material. The back cover 42b has a rubber pad on the body 42a. The KG42d is fixed with a screw through the gasket 42g, and the rubber gasket 42e is attached to the KG42d. The bezel 42c is press-fitted and fixed to the body 4 through a rubber packing 42f. It is press-fitted and fixed to 2a.

[0006] Further, the case 42 and the battery pressing plate 32 are arranged so that the spring portion 32a of the battery pressing plate 32 is connected to the back cover 4. 2b is electrically connected by pressure contact, but the dial 33 has a manufacturing error. There is no electrical contact with the case 42 due to the gap 44 provided to absorb the is insulated. Also, if you carry your watch with you, the vibrations and shocks it receives from the outside may cause the text to become distorted. Even if the plate floats and partially contacts the bezel 42c, the upper surface 33b of the dial plate 33 is made of insulating material. Because it is coated with paint, there is no electrical conduction. Therefore, the clock movement On the bottom and side sides, the battery press plate and case are grounded and electrically shielded. However, the dial is not grounded on the top side, that is, the KG side, and there is no shield. It was in perfect condition.

[0007]

[Problem that the idea aims to solve]

However, as mentioned above, recent clocks are required to have multiple functions, and the clock circuit is Electricity has become increasingly complex, and as low power consumption has progressed due to the need for smaller and thinner The resistance to external noise tends to be weaker in the above-mentioned watch structure. Because the electrical shielding is incomplete, the watch is susceptible to static electricity and other electrical charges received from the outside while being carried. Air noise can cause the internal circuits of the movement to malfunction, disrupting the time, or causing In some cases, there is a risk that fatal defects such as circuit failure may occur.

[0008] This invention was created in view of the above drawbacks and completely shields the movement. This improves the watch's resistance to external noise, making it a reliable electronic watch. The purpose is to realize a shield structure for providing watches.

[0009]

[Means to solve the problem]

In order to achieve the above object, the present invention is designed so that the battery press plate and the dial plate are made of plastic. In the electronic wristwatch, each of which is disposed on opposite surfaces of a base with the base in between, the battery A part of the pushing plate is in contact with the battery, and the elastic contact part provided on the battery pushing plate is in front. By press-contacting the legs of the dial plate which are fitted and fixed to the through holes provided in the dial base. The dial is electrically connected to the battery.

0010

[Effect]

In the above structure, the battery press plate, dial plate and case are electrically grounded. , it will completely cover the periphery of the internal clock movement, that is, the top, bottom and sides, Therefore, the circuit built into the clock movement is protected against external electrical noise. This will electrically shield the watch and other watch parts to prevent malfunction or destruction.

[0011]

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. Figure 1 shows the main parts of a watch movement 1(a) is a partial sectional view of the foot of the dial, and FIG. 1(b) is a partial sectional view of the battery. be. FIG. 2 is a plan view of the timepiece movement seen from the bottom side.

0012 In Figures 1 and 2, 1 is a plastic material into which various watch parts are incorporated. The base is provided with two through holes 1a that engage with the feet of the dial. 2 is A battery holding plate made of SUS material, with a rigid collar part 2c and an elastic part 2b for fixing the battery. , and two elastic hawk-shaped contact portions 2a for pressure contact with the feet of the dial. It is set in. 3 is a dial made of metal material, 4 is a battery, and 6 is a necessary contact part. 7 is a circuit board whose surfaces other than 1 are insulating coated; and 7 is a battery receiving spring.

[0013] In the above configuration, first, the circuit board 6, The battery pressing plate 2 is assembled in this order, and the battery pressing plate 2 is attached to the base with a plurality of screws 5. It is screwed to table 1. Next, tilt the battery 4 and attach one end to the collar part 2 of the battery pressing plate 2. c, and when the other end is pushed in from the top surface, the elastic part 2b of the battery pressing plate 2 The battery 4 is elastically deformed in a plane along the R portion 4b in the radial direction of the battery 4, and the battery 4 is incorporated into the battery storage section 4b of the base 1. At this time, in front of the battery pressing plate 2 The collar portion 2c and the elastic portion 2b are configured to support the battery 4 positively due to the reaction force of the receiving spring 7. It is in pressure contact with the electrode can 4a and is electrically grounded.

[0014] Next, the dial plate 3 press-fits the dial leg 3a into the through hole 1a of the base 1. As a result, it is installed in the base 1 at a position opposite to the battery pressing plate 2, and the mating Fixed. At this time, the tip of the leg 3a of the dial plate is shaped like a hawk on the battery pressing plate. The contact portion 2a is elastically deformed in the plane direction and assembled while being held between the forks. be caught. Note that the fork-shaped contact portion 2a is bent in the cross-sectional direction and attached to the circuit board 6. Since it is in pressure contact, it should not float in the cross-sectional direction and separate from the circuit board 6. Designed.

[0015] In this state, the fork-shaped contact portion 2a of the battery pressing plate 2 is elastically held. Since the dial plate 3 is in pressure contact with the leg 3a of the dial plate, the dial plate 3 is pressed through the battery press plate 2. This means that the battery 4 is electrically grounded. In addition, the battery pressing plate 2 has a The base spring 2d is bent and raised, and the movement is assembled into the exterior. When the ground spring 2d contacts the back cover, the case is also grounded. . Therefore, in a finished watch with a clock movement built into the exterior, the movement The watch parts including the circuit built into the watch are the dial, battery press plate, and case. The surrounding area is completely electrically shielded, preventing external electrical noise from being received while carrying the device. can improve resistance to In addition, the contact part of the battery press plate has a hawk shape. Even if it is not, the same effect can be obtained as long as it has at least some spring properties. It is clear that

[0016]

[Effect of the idea]

As described above, according to the present invention, the dial plate and case are grounded via the battery press plate. Completely shielded structure for electronic watches without increasing the number of parts This makes it possible to avoid time errors and errors caused by electrical noise that the watch receives from the outside. We can provide highly reliable watches that do not stop due to operation or circuit damage. Furthermore, it is possible to create more complex multi-function watches and smaller, thinner watches with lower power consumption. It has great effects such as

[Brief explanation of drawings]

FIG. 1(a) is a partial cross-sectional view of the foot of a dial of a timepiece movement according to an embodiment of the present invention. (b) is a partial sectional view of a battery part of a timepiece movement according to an embodiment of the present invention.

FIG. 2 is a plan view of a timepiece movement according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a foot of a dial of a conventional timepiece movement.

FIG. 4 is a partial sectional view of a completed timepiece according to a conventional example.

[Explanation of symbols]

1 Base 1a Through hole 2 Battery press plate 2a Contact part 3 Dial board 3a Dial foot 4 Batteries 42 cases

Claims (1)

[Scope of utility model registration request] Claim 1: A dial plate made of a metal material, a base made of a plastic material having a through hole that engages with a foot of the dial plate, and a battery presser plate for holding a battery, the battery In an electronic wristwatch in which a pressing plate and the dial plate are respectively disposed on opposite sides of the base with the base in between, a part of the battery pressing plate is in contact with the battery, and a part of the battery pressing plate is in contact with the battery. The elastic contact portion provided on the pressing plate is pressed against the leg of the dial which is fitted and fixed in the through hole of the base, and thereby connects the dial and battery with electricity through the battery pressing plate. A shield structure for an electronic wristwatch, which is characterized by being connected to each other.