Quartz crystal tuning fork vibrator for a crystal oscillator
US4178566A · kind A · utility
29Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1978 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | Jul 6, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0018
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator circuit including a flexural quartz crystal vibrator of the tuning fork type having an electromechanical coupling factor within the range of 2.5% to 3.5%. The vibrator is comprised of a quartz crystal element including a base portion and a pair of vibratable legs extending therefrom, and a pair of electrodes disposed on the quartz element for receiving alternating electrical signals of opposite polarity for effecting flexural vibration of the legs in response to the electrical signals. The quartz element is defined by a cutting angle within the range of zytw (0.degree.-10.degree.)/(10.degree.-30.degree.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.