Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1984-05-14
1987-03-03
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369107, G11B 700
Patent
active
046480854
ABSTRACT:
An optical information recording and reading apparatus checks the recording of information simultaneously with recording of said information by means of a recording laser beam by detecting a deflected portion of the reflected beam of the recording laser beam from an optical recording medium. An intensity differential signal is generated by monitoring different portions of the deflected portion of the reflected beam. The intensity differential signal is insensitive to intensity changes in the recording laser beam. The accuracy of the recorded information is determined by sensing the change of polarity of the intensity signal. An error signal is generated as a function of the polarity of the intensity differential signal to re-record information not recorded properly.
REFERENCES:
patent: 4093961 (1978-06-01), Kanamaru
patent: 4145758 (1979-03-01), Drexler et al.
patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4488277 (1984-12-01), McFarlane et al.
patent: 4538257 (1985-08-01), Klinger
patent: 4554654 (1985-11-01), Kato
NEC Corporation
Richardson Robert L.
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