At-cut crystal resonator
US6114801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Dec 14, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an AT-cut quartz resonator having excitation electrodes formed on two principal surfaces of an AT-cut quartz substrate, the two electrodes are displaced a predetermined amount apart in a direction orthogonal to the X-axis direction so that a frequency deviation in a temperature range of from -10.degree. C. to 50.degree. C. is less than .+-.2.5 ppm. Further, in an AT-cut quartz resonator in which vertically opposed electrodes on both principal surfaces of a quartz substrate are slightly displaced apart in opposite directions along the Z' axis of quartz crystal, a balancing load is formed on a piezoelectric substrate on the side opposite to the direction of displacement of the electrodes. Thus, the present invention dispenses with the need for raising the ratio of conforming to nonconforming quartz substrates by eliminating variations in their cutting angle, but makes it possible to use nonconforming quartz substrates to offer customers low-cost quartz resonators of oscillation frequencies following various specs, by making easy, simple structural modifications of slightly changing the electrode arrangement or structure, or by making simple improvements to the conventional quartz …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.