Title: Tuning fork type quartz crystal resonator with notched tines

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.

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Inventors: Kogure, Shigeru (Suwa, JP)

Application Number: 936941
Filing Date: 1978-08-25
Publication_date: 1980-03-04
Assignee: Kabushiki Kaisha Suwa Seikosha (Suwa, JP)
Primary Class(es): 310/370 310/312
Other Classes:
US Patent Ref:

2870521	Jan, 1959	Rudnick	310/312.
3683213	Aug, 1972	Staudte	310/370.
3697766	Oct, 1972	Ganter et al.	310/312.
3946257	Mar, 1976	Kawamura	310/370.

Other Refs: 2277438

Jan, 1976	DE

Primary Examiner: Budd, Mark O.
Assistant Examiner:
Attorney: