Optical information recording and reproducing apparatus

Details Optical information recording and reproducing apparatus Optical information recording and reproducing apparatus

1995-04-20

1996-10-22

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369124, 369 4426, 3692753, G11B 700

Patent

active

055684610

ABSTRACT:
An optical information recording and reproducing apparatus for recording and reproducing an information signal on/from both concave portions and convex portions of guide grooves formed on a recording medium is disclosed. The optical information recording and reproducing apparatus includes: an optical portion for focusing a light beam emitted from a light source on the recording medium; a focusing control portion for controlling a focal point of the light beam; a tracking control portion for controlling the position of the light beam; a selection portion for selecting which of the concave portions and the convex portions of the guide grooves are used for recording or reproducing; a polarity inverting portion for inverting the polarity of an output signal from the tracking control portion depending on a result selected by the selection portion; a waveform setting portion for setting a modulation pattern for the light; and a signal reproduction portion for demodulating the information signal from a light reflected or transmitted by recorded marks recorded on the recording medium; wherein at least one of the focusing control portion, the tracking control portion, the waveform setting portion and the signal reproduction portion has at least two kinds of operation conditions for recording and reproducing the information signal on/from the concave portions and the convex portions of the guide grooves, and wherein the operation conditions are selected depending on the result selected by the selection portion.

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patent: 5404345 (1995-04-01), Taki
patent: 5452284 (1995-09-01), Miyagawa et al.
N. Miyagawa et al., "Land and Groove Recording for High Track Density on Phase-Change Optical Disks", Japanese Journal of Applied Physics, vol. 32 pp. 5324-5328 (1993) Nov.
K. Kayanuma et al., "High Track Density Magneto-Optical Recording Using a Crosstalk Canceler", SPIE-Optical Data Storage, vol. 1316, pp. 35-39 (1990).
T. Iwanaga et al., "High-Density Land/Groove Recording for Digital Video File System", Japanese Journal of Applied Physics, vol. 32, pp. 5449-5450 (1993) Nov.

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