Quartz Resonator Angle Correction.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1982
- Accession Number
- ADD009313
Entities
People
- Arthur Ballato
Organizations
- United States Army