Hand reversing system for an electronic timepiece
US4157647A · kind A · utility
4Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1977 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Jul 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C13/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an analogue electronic timepiece the hands are moved by a stepping motor driven by a time standard signal supplied from a generating circuit comprising a quartz oscillator. In order to amend the time in a reverse direction, for example to correct for a different time zone, means is provided for detecting the angular position of the rotor of the motor and for supplying current in the reverse direction to the coil of the motor when the rotor reaches a predetermined angular position so as to cause the motor to rotate in a reverse direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.