Thickness-width shear quartz crystal vibrator

Details Thickness-width shear quartz crystal vibrator Thickness-width shear quartz crystal vibrator

1978-07-28

1980-11-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, 310368, H01L 4108, H01L 4118

Patent

active

042348129

ABSTRACT:
A thickness-width shear quartz crystal vibrator, having each vibrating mode (p, q, r) respectively being (1, 1, 1), in which "p" is the number of crests of a sine wave form of polarization directed along its electrical axis, "q" is the number of crests of a cosine waveform of polarization directed along its thickness and "r" is the number of crests of cosine waveform of polarization directed along its width perpendicular to the said electrical axis. The vibrator is cut out from a Y-plate of quartz crystal at the angle between 34 to 36 degrees turned around the X-axis thereof and is provided with plural opposite electrodes on the vertical surface or the surface parallel to the y-axis thereof. Therefore, the said quartz crystal vibrator has a low equivalent impedance and also has an excellent frequency-temperature characteristic.

REFERENCES:
patent: 2306909 (1942-12-01), Sykes
patent: 3479536 (1969-11-01), Norris
patent: 3766616 (1973-10-01), Staudte
patent: 3792294 (1974-02-01), Royer
patent: 4076987 (1978-02-01), Zumsteg
patent: 4112323 (1978-09-01), Kawashima

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