Coating surrounding a piezoelectric solid state motor stack
US5148077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Sep 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/057
Abstract
An encapsulated piezoelectric solid state motor stack having a plurality of piezoelectric disks interleaved with a plurality of electrodes. A first elastomer is used for encapsulating the stack to prevent arc-over. A second elastomer is used for encasing the combination of the encapsulating elastomer and the stack. An elastomer grease is sandwiched between the encapsulating elastomer and the encasing elastomer for reducing friction between the combination and the encasing elastomer. The friction is induced by an axial displacement produced between first and second end surfaces of the stack when the electrodes are biased by a source of electrical potential. The structure also includes a protective housing including and a diaphragm. The housing cylindrically encases the combination of the stack, the encapsulating elastomer, the elastomer grease and the encasing elastomer, and the and one end thereof. The diaphragm is attached to the housing for encasing the other end of the combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.