Tuning fork type quartz crystal resonator with notched tines

Details Tuning fork type quartz crystal resonator with notched tines Tuning fork type quartz crystal resonator with notched tines

1978-08-25

1980-03-04

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310312, H01L 4110

Patent

active

041919068

ABSTRACT:
A conventional tuning fork type quartz crystal resonator has mainly two vibration modes. They are fundamental vibration mode and overtone having the resonance frequency six times as much as the frequency of fundamental vibration. These two vibration modes have similar high quality factors. When this resonator is put to practical use, there are instances where it oscillates in undesirable mode of vibration. Accordingly, in this invention, concave portions are provided at the tops of resonator in order to prevent it. It is the most effective in case that concave portions are provided in the region of 0.65 to 0.85 from roots of arms.

REFERENCES:
patent: 2870521 (1959-01-01), Rudnick
patent: 3683213 (1972-08-01), Staudte
patent: 3697766 (1972-10-01), Ganter et al.
patent: 3946257 (1976-03-01), Kawamura

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