Piezoelectric sensor device, and polarization method of piezoelectric body of piezoelectric sensor device
US9112142B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2012 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Oct 25, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A piezoelectric sensor device includes a piezoelectric element, a polarization processing unit and a controller. The piezoelectric element has a pair of electrodes sandwiching a piezoelectric body. The polarization processing unit is configured to execute polarization processing in which polarization voltage is applied to the polarization element. The controller is configured to control an execution timing of the polarization processing by the polarization processing unit, and includes a characteristics value acquisition unit configured to acquire a characteristics value relating to a polarization volume of the piezoelectric body, a determination unit configured to determine whether a polarization property is in a stable state or in an unstable state based on the characteristics value, and a polarization controller configured to control the polarization processing unit to apply the polarization voltage to the piezoelectric body when the determination unit determines that the polarization property of the piezoelectric body is in the unstable state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.