Erasable optical disk and optical information recording/reproduc

Details Erasable optical disk and optical information recording/reproduc Erasable optical disk and optical information recording/reproduc

1988-02-24

1990-07-03

Stephan, Steven L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369100, 369111, 369124, 369 4421, G11B 1110, G11B 502

Patent

active

049397133

ABSTRACT:
This invention provides an erasable optical disk, on which information is recorded and reproduced repeatedly through the irradiation of laser beams, and an optical information recording/reproduction apparatus which records and reproduces information on the erasable optical disk. In erasing and then recording information on the erasable optical disk by using an erasing laser beam and a recording/reproduction laser beam, respectively, the tracking of both laser beams on the same track is detected so as to prevent erroneous erasing. The apparatus uses the optical disk having a mark signal disposed between a sector identifier and a data field, which mark signal is capable of determining the presence of the erasing laser beam on an adjacent track on the erasable optical disk, and the apparatus reproduces and detects the mark signal by using the erasing laser beam. The apparatus discriminates the position of the erasing laser beam depending on whether the mark signal has been detected or not, thereby preventing erroneous erasing of data on the adjacent track and simultaneously assuring the presence of the erasing laser beam on the same track along with the recording/reproduction laser beam.

REFERENCES:
patent: 4561084 (1985-12-01), Gerard et al.
patent: 4622564 (1986-11-01), Kaku et al.
patent: 4679184 (1987-07-01), Yoshida et al.
patent: 4700336 (1987-10-01), Yoshida et al.
patent: 4727528 (1988-02-01), Wyland
patent: 4771415 (1988-09-01), Taki
patent: 4849953 (1989-07-01), Nomura et al.

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