Electronic watch

Patent metadata

Field	Value
Publication number	US-11474482-B2
Application number	US-201916352914-A
Country	US
Kind code	B2
Filing date	Mar 14, 2019
Priority date	Mar 14, 2018
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

An electronic watch including a movement, and the movement includes a movement main body, a plate manufactured by a ferromagnetic metal, and a hook having flexibility, and the plate includes an engagement part that protrudes from the rear surface of the plate and which is configured to accommodate one end part of the hook, and the one end part of the hook is configured to be accommodated by the engagement part by elastically deforming the hook, and the other end part of the hook is fixed to the movement main body.

First claim

What is claimed is:

1. An electronic watch having a movement, the movement comprising:
a movement main body;
a plate manufactured by a ferromagnetic metal; and
a hook having flexibility higher than that of the plate, wherein
the plate includes an engagement part that protrudes from the rear surface of the plate and which is configured to accommodate one end part of the hook, and
the hook includes a first portion arranged at one end part of the hook and including a protruding part accommodated by the engagement part, a second portion arranged at the other end part of the hook and fixed to the movement main body, and a curved part having U-letter shape.

2. The electronic watch according to claim 1 , wherein
the movement main body has a motor, and
the plate and at least a part of the motor of the movement main body are arranged in an overlapping manner when viewed from a direction perpendicular to the rear surface of the plate.

3. The electronic watch according to claim 2 , wherein the motor has a stator provided with a pair of slits, and the engagement part is arranged in a vertical direction to a line connecting between the pair of slits when viewed from a normal direction of the plate.

4. The electronic watch according to claim 1 , wherein the hook has flexibility higher than that of the engagement part.

5. The electronic watch according to claim 1 , wherein the plate supports a solar cell.

6. The electronic watch according to claim 1 , wherein the movement further comprises a spring member that electrically connects a circuit substrate of the movement main body and the plate.

7. The electronic watch according to claim 1 , wherein the other end part of the hook is sandwiched and fixed between two insulating members of the movement main body.

8. The electronic watch according to claim 1 , wherein the other end part of the hook is formed into one unit together with an insulating member of the movement main body.

9. The electronic watch according to claim 1 , wherein the movement main body includes,
a wheel train,
a wheel train bridge in which a hole that transmits light is formed and which holds the wheel train,
an oscillation circuit that generates a reference frequency signal indicating a reference frequency,
a motor that drives the wheel train based on the reference frequency signal generated by the oscillation circuit,
an accommodation member accommodating the oscillation circuit and that does not transmit light.

10. The electronic watch according to claim 9 , further comprising:
a battery that supplies power to the oscillation circuit, wherein the oscillation circuit is arranged so as to overlap none of the motor and the battery when viewed in a plan view.

11. The electronic watch according to claim 10 , wherein
the movement main body further includes a winding stem driving the wheel train, and
the oscillation circuit is arranged so as not to overlap the winding stem when viewed in a plan view.

12. The electronic watch according to claim 9 , wherein
the oscillation circuit includes a quartz crystal oscillator and a semiconductor circuit that generates the reference frequency signal based on oscillation of the quartz crystal oscillator as well as supplying a current to the quartz crystal oscillator, and
both the quartz crystal oscillator and the semiconductor circuit are accommodated by the accommodation member.

13. The electronic watch according to claim 9 , wherein on the surface of the wheel train bridge, a reflection suppression layer is formed by surface processing with one of black nickel plate, black ruthenium plate, DLC coating.

14. The electronic watch according to claim 1 , wherein the movement main body includes,
a wheel train,
a wheel train bridge that holds the wheel train, and
a hand position detection mechanism having a position detection gear in which a transmission part that transmits light is formed and which rotates in response to the wheel train being driven, a light emitting element that radiates light to the transmission part, and a light receiving element that receives light radiated from the light emitting element via the transmission part, wherein
in the wheel train bridge, a hole that transmits light is not formed in an overlap part that overlaps the position detection gear when viewed in a plan view and the hole is formed in a portion other than the overlap part.

15. The electronic watch according to claim 14 , wherein on the surface of the wheel train bridge, a reflection suppression layer is formed by surface processing with one of black nickel plate, black ruthenium plate, DLC coating.

16. The electronic watch according to claim 15 , wherein the reflection suppression layer is formed by surface processing with the black plate.

17. An electronic watch comprising a movement,
wherein the movement has:
a movement main body;
a plate manufactured by a ferromagnetic metal; and
a hook having higher flexibility than that of the plate,

the plate includes an engagement part that protrudes from the rear surface of the plate and which is configured to accommodate one end part of the hook
the one end part of the hook is configured to be accommodated by the engagement part by elastically deforming the hook and the other end part of the hook is fixed to the movement main body, and
the other end part of the hook is fixed between a circuit substrate and an insulating member of the movement main body, and the hook is adjacently arranged so as to contact with the insulating member.

Assignees

• Citizen Watch Co Ltd

Inventors

• Morita Shoichiro
• Imamura Kazuya
• Hosaka Takashi

Classifications

• G04C10/00

  Arrangements of electric power supplies in time-pieces {(Mounting, assembling of components G04C3/008)} · CPC title

• G04C3/008

  Mounting, assembling of components · CPC title

• G04C3/14

  incorporating a stepping motor (G04C3/02 - G04C3/12 take precedence {; generating commutating pulses in primary clocks G04C13/0463}) · CPC title

• G04C3/12 Primary

  driven by piezoelectric means; driven by magneto-strictive means · CPC title

• G04G3/04

  Temperature-compensating arrangements · CPC title