Frequency regulating method for tuning fork type vibrator and tuning fork type vibrator frequency-regulated by the method
US7417362B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2004 |
| Grant date | Aug 26, 2008 |
| Priority date | — |
| Expiry date | Jul 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2003/0492
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A piezoelectric element of a tuning fork resonator comprises a base portion and a plurality of leg portions. Drive electrodes are formed on top and bottom major surfaces and both side surfaces of each leg portion. The drive electrodes have polarities different between on the top and bottom major surfaces and the both side surfaces. The drive electrodes on the side surfaces are connected to each other. Further, metal film for frequency adjustment is formed on a tip portion of each leg portion of the piezoelectric element. The frequency adjustment is performed by removing the metal film formed on at least one surface of side surfaces and a tip surface of the tip portion by beam irradiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.