Accession Number : ADD009313

Title :   Quartz Resonator Angle Correction.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Ballato,Arthur

Report Date : 25 Mar 1982

Pagination or Media Count : 10

Abstract : This invention relates to the correction of the orientation angle or angle of cut of quartz crystal blanks which substantially eliminates the initial formation of mesas and the subsequent lapping operation, as heretofore required, by providing a controlled linear etching gradient across opposing faces of a crystal plate or blank which is to be corrected. A beam for either ion etching or photolytic etching is repeatedly scanned across the face of the crystal plate in a multi-line raster pattern under the control of a microprocessor or mini-computer which controls the contour of the face being etched. X-ray apparatus monitors the etching and feeds information back to the computing apparatus for providing a closed loop control. The scanning includes either intensity modulation or velocity modulation of the beam, or succeeding scan lines are repetitively scanned a greater number of times than the respective preceding lines causing increasing amounts of the surface to be eroded as the scanning operation proceeds. (Author)

Descriptors :   *Patent applications, *Quartz resonators, *Angles, *Corrections, *Etching, Contours, Microprocessors, Control, Gradients, Photolysis, Linear systems, Modulation, Scanning, Inventions

Subject Categories : Electrical and Electronic Equipment
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE