Coupled mode tuning fork type quartz crystal vibrator

Details Coupled mode tuning fork type quartz crystal vibrator Coupled mode tuning fork type quartz crystal vibrator

1979-05-29

1982-03-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310312, 310370, H01L 4108

Patent

active

043203205

ABSTRACT:
Cutting a quartz tuning fork crystal vibrator at a preferred angle and with a thickness which establishes a close coupled relationship between the flexural and torsional modes of vibration of the arms or tines produces a vibrator having a highly favorable cubic frequency temperature characteristic at predetermined frequencies. Weight added to the ends of the vibrating tines reduces the frequency of both flexural and torsional vibration, whereas weight added at nodal points in the flexural vibration primarily reduces only the torsional vibrational mode. Accordingly, a wide range of frequency adjustments is possible. Deviations from the desired crystal operating frequency due to manufacturing variances are adjustable by sequential weight modifications while the desirable cubic temperature characteristic is retained. High accuracy over a wide temperature range permits operation in oscillator circuits at relatively low frequencies and with attendant low power consumption. Close coupling between vibrational modes occurs when the difference between the flexural and torsional frequencies is .ltoreq.0.15 of the flexural frequency. The principles for dimensioning the crystal, and adjusting thickness and weight, are applicable to both fundamental and overtone frequencies.

REFERENCES:
patent: 3128397 (1964-04-01), Shinada et al.
patent: 3423609 (1969-01-01), Hammond
patent: 3691411 (1972-09-01), Fedorkov et al.
patent: 3826931 (1974-07-01), Hammond
patent: 3969641 (1976-07-01), Oguchi et al.
patent: 4035674 (1977-07-01), Oguchi et al.
patent: 4050126 (1977-09-01), Ikeno et al.
patent: 4071797 (1978-01-01), Zumsteg et al.
patent: 4076987 (1978-02-01), Zumsteg
patent: 4099078 (1978-07-01), Shibata et al.
patent: 4126802 (1978-11-01), Hermann
patent: 4160183 (1979-07-01), Kusters

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