Tuning fork type quartz crystal resonator with variable width base
AssigneeSeiko Instruments & Electronics Ltd.
InventorsKunihiro Takahashi, Nobuyoshi Matsuyama
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Abstract
A tuning fork type quartz crystal resonator using a coupling between the fundamental flexural and fundamental torsional modes of vibration. The resonator has a base and two tuning fork arms extending from the base. The length of the base is larger than that of the tuning fork arms. The base has a narrow width portion effective to lower the vibrating displacements of the base end according to the torsional mode.
Claims25
A tuning fork type quartz crystal resonator utilizing a coupling between the fundamental flexural and fundamental torsional modes of vibration, said resonator comprising a base having head and tail ends and two tuning fork arms extending from the head end of said base, the length of said base between the head and tail ends thereof being larger than that of said tuning fork arms, said base having a relatively wide width portion near the tuning fork arms, and a relatively narrow width portion spaced from the tuning fork arms and being effective to lower the vibrating displacements of the tail end of the base attributable to torsional mode vibration.
A tuning fork resonator comprising:
- a quartz crystal tuning fork having coupled together fundamental flexural and fundamental torsional modes of vibration, the tuning fork having a base having opposed head and tail ends, and two vibratable arms extending outwardly from the base head end, the length of the base from the head end thereof to the tail end thereof being longer than the length of the tuning fork arms, the base having along its length a relatively wide width portion and a relatively narrow width portion, the relatively narrow width portion being spaced from the base head end and being positioned and dimensioned to lower the vibrating displacements of the base tail end attributable to fundamental torsional mode vibrations to thereby reduce the leakage of vibrational energy from the base during use of the tuning fork resonator.
Dependencies are inferred from the claim text.