Piezoelectric ceramic composition, and high power output transformer made of the same composition
US6495947B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/853
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic composition in which the mechanical quality factor Qm and the electromechanical coupling factor Kp are superior, and a high power output piezoelectric transformer made of it are disclosed.The piezoelectric ceramic composition according to the present invention is composed of Pb1−aSra [(Ni1/2W1/2)b(Mn1/3Nb2/3)c(Zr1−xTix)1−b−c]O3+kPbO, where a is 0-0.06 mol %, b is 0.01−0.05 mol %, c is 0.01-0.09 mol %, x is 0.47-0.53 mol %, and k is 0.1-0.7 wt %.The piezoelectric transformer according to the present invention includes: a piezoelectric block composed of the same composition; a first electrode consists of an inner electrode and an outer electrode, the inner electrode being formed at a center of a top of the piezoelectric block, and the outer electrode being formed around the inner electrode by being separated by an isolating region; a second electrode is formed on the bottom of the piezoelectric block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.