Hand position detecting device
US8208348B2 · kind B2 · utility
4Cited by
17References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 2009 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Sep 1, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/146
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When detecting a rotational position of a seconds hand, it is determined whether data stored in a register in correspondence with a supply state of a drive current previously supplied to a coil of a stepping motor is “0”. When the data is “0”, the rotational position of the seconds hand is optically detected. When the data is “1”, the seconds hand is rotated one step, and then, the rotational position of the seconds hand is optically detected. Even though the seconds hand is shifted one second, the position detection is executed every two steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.