Reference signal frequency correction in an electronic timepiece
US4068463A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1975 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Dec 17, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G3/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Zero adjustment of second information in an electronic timepiece is carried out upon receiving a command from the operator through a zero adjust switch. Increment one is performed on minute information when the second information is above a predetermined value, for example, twenty-four seconds when the zero adjustment command is generated. The reference signal frequency is automatically corrected by detecting the second information when the zero adjustment command is generated, in such a manner that the reference signal frequency is increased to render the timepiece faster when the second information is above the predetermined value, and the reference signal frequency is decreased to render the timepiece slower when the second information is below the predetermined value when the zero adjustment command is generated. A duration counter is preferably provided for detecting a time period initiating upon generation of a zero adjustment command and terminating upon generation of the following zero adjustment command. The correction of the reference signal frequency is not carried out when the duration detected by said counter is greater than a predetermined value, for example, one mont…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.