Apparatus for automatically adjusting the frequency of piezoelec

Details Apparatus for automatically adjusting the frequency of piezoelec Apparatus for automatically adjusting the frequency of piezoelec

1977-03-17

1977-12-20

Whitehead, Harold D.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51165R, B24B 4900, B24C 332

Patent

active

040639100

ABSTRACT:
Apparatus for automatically adjusting the frequency of a piezoelectric reator in the form of a bar or plate includes circuitry for applying a voltage to the resonator to cause it to resonate, measuring the frequency of the resonator continuously during a frequency adjusting cycle, continuously comparing the measured frequency with a desired frequency to obtain a difference frequency value, storing the difference frequency value at the beginning of the adjusting cycle, deriving from the difference frequency value a threshold value equal to one-half of the difference frequency value, comparing the threshold value with the frequency difference value, removing material by a sand blast from a first extremity of the resonator as long as the difference frequency value is greater than the threshold value and thereafter removing material from the other extremity of the resonator until the difference frequency value is nil.

REFERENCES:
patent: 3453781 (1969-07-01), Greenman
patent: 3589081 (1971-06-01), Kilischenko
patent: 3665570 (1972-05-01), Brooks
patent: 3691695 (1972-09-01), Green
patent: 3702042 (1972-11-01), Cochran
patent: 3808752 (1974-05-01), Beaver
patent: 3829962 (1974-08-01), Simonelic

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