Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-10-15
1982-04-13
Canney, Vincent P.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369126, 369 53, G11B 2736, H04N 580
Patent
active
043251340
ABSTRACT:
In an apparatus for detecting defects on capacitive video disc records, a pickup stylus spanning a plurality of information tracks is effectively swept over the recorded disc area by rotation of the disc. The stylus, upon encountering a convex surface defect, is lofted from the disc surface with a consequent reduction in stylus-disc capacitance. The change in capacitance is indicative of the stylus ejection distance and thereby releated to the size of the defect. Transducers monitor the radial position of the stylus and the angular position of the disc. Each time a disc defect generates a defect indicative capacitance change, the coordinates of the defect are recorded as well as the magnitude of the capacitance change.
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patent: 3842194 (1974-10-01), Clemens
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patent: 4183060 (1980-01-01), Barnette
Langley Howard M.
Stephens Joseph W.
Canney Vincent P.
Faber Alan
Herrmann E. P.
RCA Corporation
Tripoli J. S.
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