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US 4,173,726 AGranted
Tuning fork-type piezoelectric vibrator
AssigneeKabushiki Kaisha Kinekisha-Kenkyujo
InventorMotoyasu Hanji
Life of this patent
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Abstract
A tuning fork-type piezoelectric vibrator having electrodes for the excitation formed on the legs of the vibrator body which electrodes extend for at most subsequently half the length of said leg reveals a powerful suppression of the vibration modes of higher orders and substantially no increase in the series resonant impedance in the vibration modes of fundamental frequency.
Claims5
A tuning fork-type piezoelectric vibrator comprising:
- (i) a vibrator body having legs each with a sliding end and a free end, both as defined in the foregoing specification
- (ii) at least one excitation electrode positioned on a face of each leg, each such excitation electrode commencing at said sliding end and extending from said sliding end for a distance of from 0.3 l to 0.5 l, where l is the length of each of said legs measured from said sliding end to said free end.
Dependencies are inferred from the claim text.