Analog correction of quartz resonator angle of cut

Details Analog correction of quartz resonator angle of cut Analog correction of quartz resonator angle of cut

1982-03-25

1983-06-14

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156643, 156654, 156663, 156345, 219121LM, B44C 122, C03C 1500, C03C 2506

Patent

active

043881467

ABSTRACT:
The angle of cut of a quartz resonator blank is corrected by a photolytic etching technique whereby an intensity gradient of photon energy is developed across the surface crystal blank which is to be corrected. The intensity gradient is generated by means of a lens system located intermediate a photon source and the crystal blank, the surface of which has been treated with a photolytic etchant. The lens system includes at least one lens having a region of variable transmissivity of photon energy so that the amount of photon energy impinging on the crystal determines the depth of surface erosion. Additionally, the etching operation is controlled by means of a programmed digital computer which controls the contour of the face being etched upon receiving feedback information from X-ray apparatus which examines and monitors the etching for providing closed-loop control.

REFERENCES:
patent: 3489564 (1970-01-01), Schaefer
patent: 3694677 (1972-09-01), Guttwein et al.
patent: 3803774 (1974-04-01), Miller
Proceedings of the 30th Annual Symposium on Frequency Control, (1976) pp. 9-263, "A Method of Angle Correction", D. Husgen, et al.
Proceedings of 1980 IEEE Ultrasonics Symposium, "What Saw Can Learn From Baw . . . ", T. Lukaszek, et al.

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