Piezo-electric quartz resonator
US4313071A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Sep 7, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The resonator according to the invention comprises at least one quartz crystal in the form of a rectangular thin plate, of which the length l is directed along an axis X', the width w along an axis Y' and the thickness t along an axis Z', and which vibrates in a contour mode. The axis Z' is situated in the plane of the electrical axis X and optical axis Z of the crystal and forms with the axis Z an angle .phi. such that EQU 16.degree.<.phi.<36.degree. and the axis Y' forms with the mechanical axis Y of the crystal an angle .theta. such that EQU 10.degree.<.theta.<30.degree. This resonator presents a zero temperature coefficient of the first order and is not dependent to any critical extent on the dimensional ratio between the sides w and l of the plate; the temperature coefficients of higher order are very small. The piezo-electric coupling is such that the optimized mode of oscillation is the only one excited in practice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.