Piezoelectric single crystal, ultrasonic probe, and array-type ultrasonic probe
US5402791A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Aug 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a piezoelectric single crystal which has a large electromechanical coupling coefficient and hardly brings about depolarization due to the effect of heat in, e.g., the steps of manufacturing an ultrasonic transmitting/receiving element. The piezoelectric single crystal consists essentially of a general formula: EQU Pb{[M1.sub.1/3 Nb.sub.(2/3)-(2z/3) Ta.sub.2z/3 ].sub.1-x-y Ti.sub.x M2.sub.y }O.sup. 3 wherein M1 represents at least one metal selected from the group consisting of Zn, Ni, and Mg, M2 represents at least one metal selected from the group consisting of Pt, Fe, Bi, Rh, and Ir, and x, y, and z are defined as 0.05.ltoreq.x.ltoreq.0.2, 0.00001.ltoreq.y.ltoreq.0.01, and 0.ltoreq.z.ltoreq.0.1, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.