Cut angles for tuning fork type quartz resonators
US4503353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Jul 11, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/215
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Axes X', Y' and Z' of a resonator are established from the axes X, Y and Z of a quartz crystal by virtue of two rotational movements through angles .phi. and .theta., respectively. The resonator is energized to vibrate in accordance with the fundamental torsional mode. The angles of cut .phi. and .theta. are such that the first-order temperature coefficient is zero. The torsional mode may be coupled to a flexural mode in order to render the second-order temperature coefficient zero. The fork tines extend in the X' direction. In other embodiments the tines extend in the Y' direction and the rotation .phi. and .theta. are about the X and Z' axes, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.