Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1985-04-12
1988-02-23
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 54, G11B 2736
Patent
active
047275316
ABSTRACT:
An optical data recording system has real time error checking by sensing the level of reflected radiation from the high energy level pulse used to form a spot on a disc, and then comparing the sensed level with a reference signal to thus sense a recording failure or defect in the disc. The sensed signal may be voltage shifted by passing through a coupling capacitance with the output discharged during an initial portion of the recording. Additionally, the reference signal may be derived from the sensed signal by passing through a second capacitive coupling circuit whose output is clamped to zero during a standby mode, the reference output being inverted and reduced by a fixed ratio to provide a proper reference voltage.
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Ito Osamu
Watanabe Isao
Mitsubishi Denki & Kabushiki Kaisha
Psitos Aristotelis M.
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