Laminated type piezoelectric apparatus
US5209453A · kind A · utility
34Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1990 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Nov 19, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/24
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piezoelectric apparatus includes a piezoelectric device which is biased by a fluid force instead of a spring. Since the fluid force can be maintained within a predetermined value even after the piezoelectric device has been used number of times, and since the fluid force can be modulated by fluid pressure providing means and valve means when the fluid force is decreased from the predetermined valve, the present piezoelectric apparatus can maintain the initial pressure on the piezoelectric device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.