Adjusting the frequency of piezoelectric crystal devices via fra

Details Adjusting the frequency of piezoelectric crystal devices via fra Adjusting the frequency of piezoelectric crystal devices via fra

1979-02-28

1980-09-23

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310361, 310367, 29 2535, H01L 4108, H01L 4122

Patent

active

042245478

ABSTRACT:
A method which permits highly stable frequency adjustment of piezoelectric crystal devices to tight tolerances. Small fragments of the crystal (10) which resemble conchoidal shells (18) are removed from at least one surface (11) of the crystal plate by fracturing. In one example, this is accomplished by applying pressure from a sharp-pointed stylus (20) near the edge of the plate.

REFERENCES:
patent: 2245178 (1941-06-01), Bechmann
patent: 3074034 (1963-01-01), Crownover
patent: 3717778 (1973-02-01), Nagata et al.

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