Accuracy correction in an electronic timepiece
US4254494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1978 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Mar 21, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G3/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for correcting the accuracy of a reference signal in an electronic timepiece comprises an electronic timepiece including a reference signal frequency correction means for increasing or decreasing the reference signal frequency in a digital fashion with the use of a low frequency signal, and a quartz tester arrangement for measuring the accuracy of the reference signal frequency. The quartz tester arrangement indicates the displacement of the reference signal frequency from the standard signal frequency with the use of five lamps, each of which is selected to be enabled in accordance with the detected value of the displacement. The reference signal frequency correction means in the electronic timepiece includes five manually operable switches corresponding to said five lamps and functions to increase or decrease the reference signal frequency in a digital fashion in response to the closing of the switches corresponding to the enabled lamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.