Piezoelectric actuator and method of compensating direction thereof
US6690100B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1999 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Jul 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezoelectric actuator is formed in a manner which enhances the identifying function of markings provided thereon, and minimizes the influence on the markings when an electrode pattern on the piezoelectric actuator is shifted. The piezoelectric actuator has a piezoelectric element, an electrode pattern formed thereon, and at least one identifying marking formed on the electrode pattern, each identifying marking having a shape comprising multiple sides and being formed at a specific location of the electrode pattern for use in identifying a characteristic of the electrode pattern. In one embodiment, the piezoelectric element has a disk shape, the electrode pattern comprises a plurality of electrodes provided on an inner side of the piezoelectric element, selected electrodes being connected to each other in a desired pattern, and the identifying marking is formed on the electrode pattern proximate a peripheral edge of the piezoelectric-element and has at least three straight sides so that the area of the identifying marking is based on the length of its sides rather than a radius. Thus, shifting of the identifying marking with respect to the curved peripheral edge of the disk-shape…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.