Electronic timepiece having a voltage conversion circuit
US4221111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Aug 7, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G19/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic timepiece having a voltage conversion circuit for providing a different supply voltage from the timepiece battery voltage, detection means for detecting a condition in which a drive signal of relatively high voltage must be applied to an electromagnetic transducer of the timepiece, which is driven intermittently, switching means controlled by the detection means for selecting either the battery voltage or the converted voltage, and a circuit containing a capacitor which is charged by the output voltage of the switching means while the electromagnetic transducer is not being driven, and is discharged by supplying power to the transducer when the latter is driven, so that drive power is supplied to the transducer from, in effect, a low impedance source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.