Quartz crystal resonator
US7608986B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 2, 2006 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Nov 16, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/1035
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A quartz crystal resonator includes a quartz crystal resonator element having a main surface including an X axis (electrical axis) and a Z′ axis of an inclination rotated at an angle (y) equal to or greater than 36.4 degrees and equal to or smaller than, 40.5 degrees from a Z axis (optical axis) around the X axis, a main vibrating portion vibrating at a predetermined resonance frequency (f) and a supporting portion integrally formed with the main vibrating portion in such a manner as to be formed peripherally to surround the main vibrating portion, and two covers having a thermal expansion coefficient equal to or greater than 6×10−6 per degrees centigrade and equal to or smaller than 10×10−6 per degrees centigrade and bonded to the supporting portion so as to sandwich the quartz crystal resonator element therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.