Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1987-04-22
1989-08-01
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, G11B 700
Patent
active
048539171
ABSTRACT:
An optical information processing apparatus including a light source, a lens system for condensing the light beam emitted from the light source as a minute spot on the track of a recording medium, tracking signal detectors for receiving the light beam from the spot modulated by the recording medium to thereby detect the positional deviation of the spot relative to the track in the tracking direction crossing the track, a correcting device for moving the lens system in the tracking direction in response to the output signal from the tracking signal detectors to thereby correct the positional deviation, and lens position detectors including at least one photoelectric converting element provided outside the effective diameter of the lens system so as to be movable with the lens system, and directly receiving part of the light beam emitted from the light source by the photoelectric converting element to thereby detect the position of the lens system in the tracking direction.
REFERENCES:
patent: 4507766 (1985-03-01), Saimi et al.
Aoi Shigeru
Koyama Osamu
Shiho Makoto
Uzuki Kazuo
Canon Kabushiki Kaisha
Richardson Robert L.
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