Piezoelectric ceramic transformer being driven with thickness extensional vibration
US5241236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Apr 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/40
Abstract
A piezoelectric ceramic transformer comprises a low impedance portion 11 including a plurality of piezoelectric ceramic layers 111 to 115 having different thicknesses, a high impedance portion 12 and internal electrodes 16. The low and high impedance portions 11 and 12 are subjected to a uniform polarization treatment in a thickness direction and with the same vector of polarization. The low impedance portion 11 includes one or more piezoelectric ceramic layers having a thickness different from those of the other layers therein. No delamination of electrodes or breaking of ceramics occur upon polarization treatment. Therefore, a compact piezoelectric ceramic transformer for power source which has a high mechanical quality coefficient Qm and a high electric power transmission efficiency is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.