Face shear mode quartz crystal resonator
US4900971A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1989 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Mar 7, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A face shear mode quartz crystal resonator having a vibrational portion and supporting portions incorporated therein by an etching method. A flexural portion of the supporting portion is connected with a central portion of a side of the vibrational portion. The width W and length L of the flexural portion connected with the vibrational portion are designed so as to meet "W.ltoreq.0.67L". The supporting portions are provided at the edges in the z'-axis direction of the vibrational portion which is substantially square and fixedly supported via both distal end portions of the supporting portions, and each side of the vibrational portion is from 0.72 mm to 2.02 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.