Piezoelectric type actuator
US5004945A · kind A · utility
27Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Sep 22, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/50
Abstract
According to the present invention there is provided a piezoelectric type actuator wherein a compressive force is exerted on a piezoelectric laminate, using a coil spring having a relatively small spring constant and a coned disc spring having a relatively large spring constant, the said compressive force being in the range of 4.0 to 50 in terms of the ratio of the spring constant of the coned disc spring to that of the coil spring. Under the above construction, the performance of the piezoelectric laminate is not deteriorated under any conditions during use, and the size of the piezoelectric type actuator can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.