Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1985-10-02
1986-04-15
Hartary, Joseph W.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
346 76L, 369111, 369116, G11B 2736, G01D 1800
Patent
active
045832102
ABSTRACT:
Method and apparatus for optically recording information on a moving information storage member and for reading the information immediately after it is written. An intensity modulated writing beam and a separate reading beam of light are simultaneously focused by a single objective lens. The reading beam impinges the medium at a point trailing the point of impingement of the writing beam by a prescribed amount. The reading beam is reflected by the moving medium in accordance with the recorded information. The modulated reflected light is collected by the objective lens, and the intensity of the reflected light is sensed for generating a playback signal. The quality of the playback signal may be monitored to allow control of the intensity of the writing beam.
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Clark Ronald J.
Discovision Associates
Hartary Joseph W.
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