Quartz piezo-electric element vibrating in a coupled mode

Details Quartz piezo-electric element vibrating in a coupled mode Quartz piezo-electric element vibrating in a coupled mode

1976-01-20

1978-01-31

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4104

Patent

active

040717976

ABSTRACT:
This specification describes a rectangular quartz crystal which has been igned with specific length-width-thickness ratios whereby vibration takes place in the thickness shear mode strongly coupled with flexural vibrations. The choice of the specific ratios permits an improved performance insofar as dynamic capacitance range, temperature dependent variations of frequency and finally quality factor are concerned. The dimensions and proportions make the crystal suitable for use as a high frequency time piece resonator.

REFERENCES:
patent: 2218200 (1940-10-01), Lack et al.
patent: 2306909 (1942-12-01), Sykes
patent: 2321358 (1943-06-01), Bokovoy
patent: 2574257 (1951-11-01), Franklin

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