Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-03-15
1996-02-20
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
3692751, 3692754, 369 4426, 369 4437, G11B 700
Patent
active
054935520
ABSTRACT:
An optical recording and readout system comprises a first optical system for projecting a plurality of optical beams onto a phase-change optical disk, a second optical system for picking out the reflected light from the optical disk, a optical sensor for sensing the reflected light picked out by the second optical system, and a signal generating circuit for producing an information signal from the output signal from the optical sensor, wherein the phase-change optical disk contains a data area containing land tracks and groove tracks on both of which user information is recorded, the land tracks and groove tracks being formed on the data area alternately, and a header area in which header information is recorded in the form of prepit rows every other track with respect to the tracks including the land and groove tracks.
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N. Miyagawa et al: "Improvement of Track Density by Land and Groove Recording on Phase Charge Optical Disk" ISOH/ODS'93 Conference Digest pp. 57-58, Jul., 1993.
Chu Kim-Kwok
Epps Georgia Y.
Kabushiki Kaisha Toshiba
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