Method of driving piezoelectric bimorph device and piezoelectric bimorph device
US5233256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1992 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/50
Abstract
A method of driving a piezoelectric bimorph device in which first and second piezoelectric ceramic layers are so electrically connected to each other as to expand or contract in the opposite directions, which is characterized in that when t.sub.1 is taken as the thickness of one of the first and second piezoelectric ceramic layers, Ec is taken as the coercive field strength of a piezoelectric material constituting the piezoelectric ceramic layer, and V.sub.1 is taken as the minimum value of the produce Ec.times.t.sub.1 =Vc.sub.1, and t.sub.2 is taken as the thickness of the other piezoelectric ceramic layer, Ec is taken as the coercive field strength Ec of a piezoelectric material constituting the piezoelectric ceramic layer, and V.sub.2 is taken as the minimum value of the produce Ec.times.t.sub.2 =Vc.sub.2, a voltage of not less than (V.sub.1 +V.sub.2) is applied to said piezoelectric bimorph device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.