Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-08-21
1996-10-01
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 54, G11B 709
Patent
active
055616453
ABSTRACT:
A method and apparatus for, in an optical data recorder, focusing a recording light beam on a recording medium. In the apparatus, an optical head has focusing means movable in a direction perpendicular to the recording medium for changing the focus 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 for producing a corresponding focus error signal; ii) generating a mark formation effectiveness signal for each of a plurality of trial focus positions, each mark formation effectiveness signal being associated with a given value of the focus error signal; iii) determining the mark formation effectiveness signal corresponding to an in-focus position and determining an offset value of the associated focus error signal; and iv) during data recording periods, in response to the focus error signal, adjusting the position of the movable focusing means so that the value of the focus error signal is maintained at the offset value.
REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4907212 (1990-03-01), Pharris et al.
patent: 5077719 (1991-12-01), Yanagi et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5142520 (1992-08-01), Yanagi et al.
patent: 5251194 (1993-10-01), Yoshimoto et al.
patent: 5351224 (1994-09-01), Nagata et al.
Eastman Clarke K.
Nelson Daniel L.
Smart Gerald J.
Eastman Kodak Company
Leimbach James D.
Tran Thang V.
Young W. R.
LandOfFree
Method and apparatus for focusing a recording light beam on a re does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for focusing a recording light beam on a re, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for focusing a recording light beam on a re will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1507534