Controlled composition and crystallographic changes in forming functionally gradient piezoelectric transducers
US5900274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1998 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | May 1, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of forming a piezoelectric element which includes piezoelectric material having a variable functionally gradient d-coefficient comprising coating a block having a uniform concentration of piezoelectric material by the steps of applying a first layer having piezoelectric material with a different chemical composition than the block onto a surface of the block to provide a different crystallographic structure than the block; and sequentially applying one or more layers of piezoelectric material on the first layer and subsequent layers with different chemical compositions of piezoelectric material also having different crystallographic structures than the block and the subsequently applied layers so as to form the piezoelectric element which has a functionally gradient d-coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.