Magnetic shielding structure of analog electronic timepiece
AssigneeSeiko Instruments Inc.
InventorMasataka Ikenishi
Life of this patent
Estimating the term…
Abstract
An analog electronic timepiece for rotating hands by a motor through a wheel train has the structure that only an hour hand wheel is disposed between a main plate and a dial. The hand wheel is supported by a pin shaped projection of the main plate and a support plate fixed to the rear side of the main plate. A dial is also fixed to the rear side of the main plate through the support plate, or directly fixed to the support plate. The support plate is made of a material having a high magnetic permeability and extended to the both ends of a magnetic core of a motor assembly so that the timepiece is not easily affected by external magnetic disturbance.
Claims7
An analog electronic timepiece comprising;
- a main plate;
- a motor assembly provided on the front side of said main plate including a magnetic core, coil block wound on said magnetic core, a stator having one opening and a rotor in said opening;
- a wheel train including a plurality of wheels provided on the front side of said main plate for transmitting rotation of said rotor to hands;
- an hour hand wheel provided on the rear side of said main plate and driven by one of said wheels;
- an hour wheel supporting plate fixed on said rear side of said main plate for supporting said hour wheel;
- said hour wheel supporting plate being made of a material having a high magnetic permeability and extended to the both ends of said magnetic core;
- and
- a dial plate provided over said hour wheel supporting plate.
Dependencies are inferred from the claim text.