Electronic timepiece
US4473303A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1983 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | Feb 18, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic timepiece is provided with a temperature compensation system which combines precise control of the timebase oscillator circuit frequency over a narrow temperature range with control of the frequency divider circuit operation to provide relatively large step changes in compensation, thereby providing accurate temperature compensation over a very wide temperature range. Data for control of this compensation is produced by computing the square of a data value which varies proportionally with temperature, with the resultant data being adjusted to provided compensation control which exactly matches the temperature characteristic of the timebase oscillator circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.