Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-06-06
1998-09-01
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, G11B 709
Patent
active
058020241
ABSTRACT:
An information recording/reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a recording medium having a plurality of tracks, by using a light beam. The apparatus includes an objective lens for irradiating the recording medium with the light beam, a spring support member for supporting the objective lens for movement in a direction transverse to the tracks of the recording medium, a drive mechanism for driving the objective lens, a tracking error detector for detecting a deviation of the light beam relative to a track and for generating a tracking error signal, a servo control circuit for servo-controlling the objective lens on the basis of the tracking error signal, a seek circuit for effecting a seek operation of the light beam to a desired track while the servo control is in an OFF state and an offset circuit for supplying the drive mechanism, during the seek operation, with an offset to cancel a force applied to the objective lens due to a spring force of the spring support member relative to the desired track.
REFERENCES:
patent: 5210732 (1993-05-01), Suenaga et al.
patent: 5228018 (1993-07-01), Rokutan
patent: 5293365 (1994-03-01), Rokutan
Canon Kabushiki Kaisha
Tran Thang V.
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