Torsional quartz crystal resonator
US5334900A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1993 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | Aug 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/215
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A torsional quartz crystal resonator has a specific cut type resulting in improved frequency temperature behavior. The cut type is defined by rotating a Z plate quartz crystal around an x-axis at an angle .phi. in the range of 0.degree. through 30.degree. and by further rotating the plate around a z'-axis at another angle .theta. in the range of -20.degree. through -10.degree. or +10.degree. through +20.degree.. The resonator has a thickness z.sub.0 and a width x.sub.0 determined such that a thickness-to-width ratio Rzx=z.sub.0 /x.sub.0 is set within the range of 0.6 through 1.1 to make the first order temperature coefficient substantially zero in combination with the optimum angles .phi. and .theta.. Excitation electrodes are disposed on major faces of the resonator normal to the z' axis, and a connecting electrode is disposed on a side face of the resonator to reduce the series resistance R.sub.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.