JPH0725743Y2 - Antimagnetic structure on the wristwatch side - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic-resistant structure for a wristwatch.

[Conventional technology]

The anti-magnetic structure in the prior art generally has an anti-magnetic plate bonded to the back cover. FIG. 3 shows an example thereof, in which a back cover 9 is bite-engaged with a side body 7 accommodating a module 8 and a magnetic plate 10 is adhered to the inner bottom surface of the back cover 9.

[Problems to be solved by the device]

However, in the prior art, in the case of using a rotating type back lid, in the case of a module having a module for attaching a magnetic plate to the back lid with an adhesive and for a module pushing up or a ground spring etc. in the module When the back cover is opened and closed, the magnetic resistant plate is worn away by the spring and chips are generated.

The present invention solves these problems, simplifies the assembling work, and prevents damage to the module.

[Means for Solving the Problems]

The structure of the present invention is provided with several notches in the circumferential direction of the middle frame fixed to the outer periphery of the module, engages with the notches, and has several rising parts that can move up and down. The magnetic-proof plate is arranged between the module ground spring provided at the lower part of the module and the back lid screw-engaged with the side body.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are cross-sectional views and perspective views of a main part of the present invention, in which 1 is a side body, 1a is a side body step, 2 is a module, 2a is a module ground spring, 3 is a dial receiving ring, 4 Is a middle frame, 4a is a cutout portion, 5 is a magnetic-proof plate, 5a is a magnetic-proof plate rising portion, and 6 is a back cover.

In this embodiment, a metal dial receiving ring 3 which is in contact with the step portion 1a of the side body 1, a lower portion thereof, made of an elastic material, and made of synthetic resin having notches 4a at several positions in the circumferential direction. Middle frame 4,
It has a magnetic-proof structure composed of a module 2 having a module ground spring 2a, a magnetic-proof plate 5 having several rising portions 5a in the circumferential direction, and a back cover 6 screw-engaged with the side body 1.

The anti-magnetic plate 5 is disposed between the module ground spring 2a of the module 2 and the inner bottom surface of the back cover 6, and serves to ground the module 2 to the back cover side through the module ground spring 2a and at the same time through the back cover 6 to the module ground spring 2a.
And the dial plate receiving ring 3 fixed to the module 2 abuts on the side body step portion 1a of the side body to hold the vertical play of the module 2. On the other hand, several rising portions 5a in the circumferential direction on the outer peripheral portion of the magnetic-proof plate 5 engage with the notches 4a in the circumferential direction of the middle frame 4. In particular, a large gap is not formed in the circumferential direction between the cutout portion 4a of the middle frame and the rising portion 5a of the magnetic plate. The rising tip is dimensioned so as not to come in contact with the lower part of the dial receiving ring 3 when the back cover 6 is completely closed. There are few places to meet. By combining the central cutout portion 4a with the magnetic plate rising portion 5a, the module is fixed by the dial plate receiving ring 3 and the middle frame 4 when the back cover 6 is opened and closed, and the magnetic plate 5 does not rotate and the magnetic plate 5 does not rotate. Moves vertically up and down, so the inner surface of the magnetic plate 5 is the module ground spring.
It has a magnetic resistance structure that is not scraped by 2a.

[Effect of device]

As is clear from the above description, according to the present invention, it is possible to save the trouble of fixing the magnetic-proof plate to the back cover with an adhesive, and to prevent the generation of chips at the contact point with the module ground spring when opening and closing the rotary screw cover. There is an effect that it can be done.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a partial perspective view of the same, and FIG. 3 is a sectional view of an essential part of a conventional example. 1, 7 ... Side body, 1a ... Side body step portion, 2, 8 ... Module, 2a ... Module pushing spring, 3 ... Dial plate receiving ring, 4 ... Middle frame, 4a ... Notch Part, 5, 10 ... Anti-magnetic plate,
5a: Magnetic-resistant plate rising part, 6, 9: Back cover.

Claims (1)

[Scope of utility model registration request] Claims: 1. A magnetism-proof structure comprising a plurality of cutouts formed in the circumferential direction of a middle frame fixed to the outer periphery of a module, engaging with the cutouts, and provided with several rising portions that can move up and down. The board
A magnetic-resistant structure for a wristwatch side, characterized in that it is arranged between a module ground spring provided at the lower part of the module and a back lid that engages a side body with a screw.