Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-05-21
1993-04-13
Hannaher, Constantine
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369109, 369112, 369 4426, G11B 700
Patent
active
052028780
ABSTRACT:
According to the present invention, recording laser beam is shot from a semiconductor laser to form a mark set which comprises a pair of marks on the track of an optical recording medium in the track width direction thereof and first information which has been coded corresponding to the interval between the paired marks in the mark set is recorded on the track of the optical recording medium. At the same time, the plural mark sets are formed on the track of the optical recording medium in the track length direction thereof and second information which has been coded corresponding to the interval between these mark sets is recorded on the track of the optical recording medium. The track of the optical recording medium is scanned in the track width direction thereof with reproducing laser beam shot from a semiconductor laser and .+-. first-order diffraction beam of an optical interference pattern which is created from the paired marks in the mark set thus scanned is detected to reproduce the first information. At the same time, the track is scanned in the track length direction thereof with the reproducing laser beam and zero-order diffraction beam of an optical interference pattern which changes corresponding to the interval between the plural mark sets thus scanned is detected to reproduce the second information.
REFERENCES:
patent: 3971002 (1976-07-01), Bricot et al.
patent: 5056080 (1991-10-01), Russell
Kanehira Jun
Ueno Naoyuki
Hannaher Constantine
Nguyen Kiet T.
Olympus Optical Co,. Ltd.
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