Method and apparatus for maintaining a recording light beam in a

Details Method and apparatus for maintaining a recording light beam in a Method and apparatus for maintaining a recording light beam in a

1994-01-10

1995-08-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4431, 369 54, G11B 709

Patent

active

054405343

ABSTRACT:
A method and apparatus for, in an optical data recorder, maintaining a recording light beam in an on-track position on a recording medium. In the apparatus an optical head has a tracking arrangement movable in a direction parallel to the recording medium for changing the tracking position of the recording light beam on the recording medium. The method comprises the steps of: i)detecting light reflected from the optical recording medium and producing a corresponding tracking error signal; ii) generating a mark formation effectiveness signal for each of a plurality of trial tracking positions, each mark formation effectiveness signal being associated with a given value of the tracking error signal; iii) determining the mark formation effectiveness signal corresponding to an on-track position and determining an on-track the value of the associated tracking error signal; and iv)during data recording periods, in response to the tracking error signal, adjusting the position of the movable tracking means so that the on-track value of the tracking error signal is maintained.

REFERENCES:
patent: 4707816 (1987-11-01), Yonezawa et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4977551 (1990-12-01), Minami et al.
patent: 5033040 (1991-07-01), Fujita
patent: 5251194 (1993-10-01), Yoshimoto et al.

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