Tuning fork type quartz resonator
US4349763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1979 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Jun 19, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/215
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A quartz crystal tuning fork resonator has a pair of vibratable arms vibratable in the flexural mode in response to excitation of driving electrodes positioned at both major surfaces and both side surfaces of each vibratable arm. The vibratable arms have a width w as measured in the widthwise direction of the major surfaces, a thickness t, and are spaced apart a distance s and the vibratable arms are dimensioned so as to satisfy the relationships s/t.gtoreq.1 and s/w.gtoreq.0.4. The resonator preferably has an overall length L.ltoreq.5 mm, an overall width W.ltoreq.1 mm and a thickness t>50 and is formed by etching. The driving electrodes are configured to establish an electric field component directed parallel to the major surfaces to thereby drive the vibrating arms in the flexural mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.