Piezoelectric device
US6534902B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2002 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Mar 1, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/787
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A piezoelectric device having an electromechanical coefficient, which can be applied to practical uses, is obtained by an energy-trapping effect using a piezoelectric ceramic having a layered perovskite structure provided with high-temperature resistance and little high-frequency loss. The piezoelectric device has a substrate formed of a piezoelectric ceramic having a layered perovskite structure. The c-axis in the substrate is preferentially oriented in the width direction thereof, and the substrate is polarized in the longitudinal direction. Two electrodes are formed on both main surfaces of the substrate so as to oppose each other in the vicinity of the central part thereof. As a material used for the substrate, a piezoelectric ceramic composition primarily composed of a ceramic composition represented by the general formula CaBi4Ti4O15 is preferably used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.