| 摘要 |
PURPOSE: An optical information reproduction device and a method are provided to decrease a tracking error and to increase the recording capacity of an optical information storage medium by using a minimum number of servo patterns. CONSTITUTION: An optical information reproduction device comprises a reproductive optical system and a servo system. The reproductive optical system produces reproduction light by radiating light onto an optical information storage medium, including a plurality of holograms, on its track and detecting the reproduction light. The servo system detects the disturbance signal of the track for 1 rotation of the optical information storage medium, estimates the location of the holograms on the track from the disturbance signal, and controls the location of the light radiated onto the optical information storage medium from the reproductive optical system. The optical information storage medium comprises a plurality of tracks, each of which comprises a plurality of servo patterns. A plurality of holograms is stored between the servo patterns of the track.
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