Piezoelectric resonators of an energy-trapping type of a width extensional vibratory mode
US4356421A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1981 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Mar 9, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/177
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A piezoelectric resonator of a width-extensional mode vibratory-energy trapping type having a rectangular piezoelectric plate of a width corresponding to a desired resonance frequency. Peripheral electrodes are deposited apart from one another in its lengthwise direction to cover over the width of opposite end portions of the piezoelectric plate in order to lower the cut-off frequency of the opposite end portions of the piezoelectric plate in comparison with the intervening central portion of the plate, so that the width-extensional mode vibratory energy may be trapped or confined within the central portion of the piezoelectric plate. The resonator can be supported and are connected to lead wires at peripheral electrodes. In the piezoelectric plate polarized in its width direction, two excitation electrodes are provided on a surface of the central portion of the piezoelectric plate in parallel with one another, one connected with one of the peripheral electrodes and the other connected to the other peripheral electrode. A set of two excitation electrodes and two spaced peripheral electrodes may be formed on the reverse surface of the piezoelectric plate in registry with those elect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.