Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-09-03
1997-11-18
Edun, Muhammad N.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369 59, 369124, G11B 708
Patent
active
056894872
ABSTRACT:
A verify-while-recording device for an optical recording apparatus includes an optical head, a reproduction amplifier, a timing control circuit, and a recording state determination circuit. The optical head records recording data on an optical disk medium by using a recording beam. The reproduction amplifier reproduces the recording data from the recording beam that is being recorded on the optical disk and outputs a reproduction signal. The timing control circuit outputs a control signal, a timing of which is controlled based on the recording data, and delayed recording data. The recording state determination circuit detects a state change in reproduction signal corresponding to the recording data and obtained from a start time point to a recording end time point, on the basis of the reproduction signal sent from the reproduction amplifier and the control signal and a delayed control signal sent from the timing control circuit and outputs a defective recording signal.
REFERENCES:
patent: 4538257 (1985-08-01), Klinger
patent: 4719612 (1988-01-01), Kenjyo
Edun Muhammad N.
NEC Corporation
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