Electronic apparatus and timepiece
US7777680B2 · kind B2 · utility
6Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | May 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an antenna device of a wristwatch, a pair of external magnetic members each attached to a respective one of both ends of a magnetic core effectively collects the magnetic flux of a standard time and frequency signal. The collected magnetic flux passes through the core around which a coil is wound, thereby inducing an electromotive force and hence improving the reception accuracy of the signal. The pair of external magnetic members screens out undesirable external magnetism which would otherwise influence motors that drive a hand shaft and hands, thereby achieving accurate hand driving and improving the high watch accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.