Time piece having a magnetic shield

Patent metadata

Field	Value
Publication number	US-12517463-B2
Application number	US-202318361137-A
Country	US
Kind code	B2
Filing date	Jul 28, 2023
Priority date	Jul 29, 2022
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A timepiece includes a case and a movement disposed in the case, the movement including a main plate, a train wheel disposed at the main plate and including a plurality of toothed gears, a train wheel bridge holding the train wheel, and a first magnetic shield component disposed between the main plate and the train wheel bridge in a side view as viewed from a direction parallel to a surface of the main plate. The first magnetic shield component, in plan view, has an annular shape and is disposed inwardly of an outer periphery of the main plate and, in the side view, is disposed within a range in which the wheel train is disposed. At least a portion of the train wheel is disposed on an inner side of the annular shape in the plan view.

First claim

What is claimed is:

1 . A timepiece comprising:
a case; and a movement disposed in the case, the movement including
a main plate,
a train wheel disposed at the main plate and including a plurality of toothed gears,
a train wheel bridge holding the train wheel, and
a first magnetic shield component disposed between the main plate and the train wheel bridge in a side view as viewed from a direction parallel to a surface of the main plate, wherein
the first magnetic shield component, in plan view as viewed from a direction perpendicular to the surface of the main plate, has an annular shape and is disposed inwardly of an outer periphery of the main plate and, in the side view, is disposed within a range in which the wheel train is disposed and at least a portion of the train wheel is disposed on an inner side of the first magnetic shield component in the plan view.

2 . The timepiece according to claim 1 , wherein
the movement includes
a mechanical energy source including a mainspring,
an oscillating weight, and
an automatic winding train wheel configured to wind the mainspring based on a rotation of the oscillating weight and
the train wheel is a self-winding train wheel.

3 . The timepiece according to claim 1 , wherein
the movement includes
a mechanical energy source and
a generator driven by the mechanical energy source to generate electrical energy and
the first magnetic shield component covers a portion on a case back side of the generator.

4 . The timepiece according to claim 3 , wherein
the movement includes a second magnetic shield component and the second magnetic shield component covers a portion of a side surface of the generator, is disposed inwardly of the outer periphery of the main plate in the plan view, and is in contact with a portion of the first magnetic shield component.

5 . The timepiece according to claim 3 , wherein
the first magnetic shield component includes a step in the direction perpendicular to the surface of the main plate and a portion of the train wheel is disposed in the step.

Assignees

• Seiko Epson Corp

Inventors

• Aoki Shunsei

Classifications

• G04C3/008 Primary

  Mounting, assembling of components · CPC title

• G04B43/00 Primary

  Protecting clockworks by shields or other means against external influences, e.g. magnetic fields {(demagnetising apparatus G04D9/00)} · CPC title

• G04C10/00

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

• G04B43/007

  Antimagnetic alloys (antimagnetic alloys with temperature compensation G04B17/227; apparatus for antimagnetising G04D9/00; alloys in general C22C) · CPC title

• G04B19/02 Primary

  Back-gearing arrangements between gear train and hands {(transmissions in general G04B13/00)} · CPC title