Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1982-12-01
1985-10-08
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, G11B 1502, G11B 2700
Patent
active
045464626
ABSTRACT:
An optical data recording and reproducing apparatus for recording digital data in a recording track on an optical recording disc. The apparatus includes a light illuminating unit for condensing an output light beam from a light source and for illuminating the disc, a recording-reproducing unit for recording and reproducing the digital data by a recording light beam and a reproducing light beam from the light illuminating unit, a dropout detecting and inspecting unit, and a recording-prohibited sector detecting unit to produce an output signal identifying a recording-prohibited sector where recording is prohibited responsive to an output signal from the dropout detecting and inspecting unit. The sector address of a recording-prohibited sector is recorded at least until recording of digital data in the recording track on the optical disc is begun. A comparator unit compares the sector address of the recording-prohibited sector with a sector address read continuously from the disc. The comparator generates a coincidence output signal which prohibits any output from the recording light beam, thus preventing any recording until the next sector on the disc is encountered.
REFERENCES:
patent: 4214280 (1980-07-01), Halfhill et al.
patent: 4325134 (1982-04-01), Langley et al.
Koishi Kenji
Ohara Shunji
Satoh Isao
Yoshida Tomio
Matsushita Electric - Industrial Co., Ltd.
Richardson Robert L.
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