Quartz crystal wristwatch
US4351040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | May 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/008
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved quartz crystal wristwatch having an analog display and a reduced thickness is provided. The wristwatch includes a battery for powering a circuit and driving coil of a step motor for operating a gear train which are all arranged on a main plate so as not to overlap in plan view. The battery is disposed adjacent to a winding stem which is provided in the longitudinal direction of a diameter or line bisecting the main plate. A center wheel bridge is mounted on the main plate and a pillar-shaped member having a tubular region and a perpendicular disc-shape region is mounted in an opening in the center wheel bridge for supporting the cannon pinion which passes through the main plate about the tubular portion of the pillar-shaped member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.