Mode coupled notched tuning fork type quartz crystal resonator
AssigneeKabushiki Kaisha Suwa Seikosha
InventorShigeru Kogure
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Abstract
A mode coupled tuning fork type quartz crystal resonator is mounted to a plug using support members of selected contour and dimensions to prevent acoustic energy loss from the plug and to avoid reduction in Q factor. A bend of 180 degrees in the support member and controlled length are factors in isolating fundamental and first overtone vibrations in flexure and fundamental torsional vibrations so as to reduce energy loss, maintain stable oscillation and improve the Q factor. A laterally extended base portion and/or tapered ends of the tuning fork arms enhance the beneficial results.
Claims28
A tuning fork type resonator comprising:
- a resonator leaf having a base and arms extending from said base, said resonator leaf having a plurality of vibrational modes, at least two of said vibrational modes being coupled, said coupled modes being a flexural mode and a torsional mode;
- projections extending laterally from the sides of said base, said projections extending at the upper part of said base, not extending from the bottom end of said base;
- notch portions laterally recessed at the lower part of said base including said bottom end;
- a mounting plug;
- resilient support means, said support means being connected at one end thereof to said base where said recessed notch portions narrow the width of said base, and at the other end said resilient support means being connected to said mounting plug.
Dependencies are inferred from the claim text.