Apparatus for measuring the rate of an analog-display electronic timepiece
US4292836A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1979 |
| Grant date | Oct 6, 1981 |
| Priority date | — |
| Expiry date | Nov 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04D7/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic measuring apparatus for measuring the rate of an analog-display electronic watch which comprises a quartz oscillator, a frequency divider with an adjustable division factor, a stepping motor and a circuit which, when the stem of the watch is pulled, produces a measuring signal emitted by the stray field of the coil of the stepping motor and comprising trains of pulses whose period and content are respectively representative of the frequency of the oscillator and the division factor. The measuring apparatus comprises a pick-up means for detecting said measuring signal, circuits for computing the rate of the watch and means for displaying said rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.