Method and circuit for driving a piezoelectric transducer
US4223242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Oct 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for reducing a resonance peak in a piezoelectric transducer for mechanically recording a signal having a band width of several MHz, in particular on a video disk comprising, applying a countercoupling current across terminals of the transducer for counteracting a current flow in the parallel capacitance of the transducer. A circuit of the invention comprises a piezoelectric transducer having two terminals and including in series a characteristic inductance, capacitance, and resistance, and a parallel capacitance characteristic in parallel to the series characteristic, a signal generator for generating the signal to be recorded, a transformer having a primary winding connected to the signal generator and a secondary winding connected to one terminal of the transducer with a symmetrically disposed central ground connected to the secondary winding. An opposite end of the secondary winding and the other terminal of the transducer are connected to a loading resistor and in turn connected to ground. A compensating capacitor is connected between the other end of the secondary winding and the loading resistor for compensating current flowing through the characteristi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.