Analog-display electronic timepiece comprising a divider with an adjustable division factor
US4382692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1981 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Jul 15, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04D7/1214
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic watch comprising a stepping motor for driving a mechanism for displaying the time information, a quartz oscillator, a frequency divider with an adjustable division factor, a circuit for adjusting the division factor, a memory containing data relating to the magnitude of said adjustment and a logic circuit which, in response to an interrogation signal, produces a measuring signal which is supplied to the coil of the stepping motor and which comprises pulses whose distribution is representative of the division factor and the frequency of the oscillator and whose duration is sufficiently short so as not to cause the motor to turn and sufficiently long to cause a magnetic stray field of the coil of the motor which can be detected by an external apparatus for measuring the rate of the watch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.