Temperature compensated drive for a piezoelectric displacement generator
US4608506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Mar 22, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/2041
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A displacement generation device includes: a bimorph piezoelectric vibrator for receiving an externally applied drive voltage and for generating a displacement in response to the drive voltage; and a temperature-compensation capacitor element electrically connected in series with the piezoelectric vibrator. The capacitor element has a capacitance with a temperature coefficient with the same absolute value but opposite sign to that of the capacitance of the piezoelectric vibrator. When the capacitance of the piezoelectric vibrator changes in accordance with a change in the ambient temperature, the capacitor element properly changes the drive voltage supplied to the piezoelectric vibrator, thereby compensating for the displacement of the piezoelectric vibrator caused by the change in ambient temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.