Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1988-11-22
1992-09-01
Levy, Stuart S.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, 369 4413, 369 4425, G11B 700
Patent
active
051446090
ABSTRACT:
In an apparatus for tracking an optical disc, speed in acquiring a steady tracking condition is significant. That is, if the light beam is subjected to feedback while it is positioned in a positive feedback region, e.g., in the middle of adjoining tracks, the track servo system causes an oscillation. Therefore, according to the present invention, there is effected a comparison between the magnitude of signals from two pits disposed offset from the track and a pit on the track to determine the position of the light beam so that the tracking error signal may be inversed when the light beam is positioned in the middle of adjoining tracks. This will operate the tracking system in the negative feedback region to more quickly achieve a stable tracking state.
REFERENCES:
patent: 4243850 (1981-01-01), Edwards
patent: 4402061 (1983-08-01), Hazel et al.
patent: 4432083 (1984-02-01), Hsieh et al.
patent: 4435797 (1984-03-01), Hsieh et al.
patent: 4443870 (1984-04-01), Hazel et al.
patent: 4489406 (1984-12-01), Hsieh et al.
patent: 4553228 (1985-04-01), Gerard et al.
patent: 4561082 (1985-12-01), Gerard et al.
patent: 4562564 (1985-12-01), Bricot et al.
patent: 4577301 (1986-03-01), Mathews et al.
patent: 4660191 (1987-04-01), Maeda et al.
patent: 4702555 (1987-10-01), Iguma et al.
patent: 4775967 (1988-10-01), Suimada et al.
patent: 4803677 (1989-02-01), Yamaguchi et al.
patent: 4807214 (1989-02-01), Getreuer
patent: 4843601 (1989-06-01), Eguchi et al.
patent: 4951275 (1980-08-01), Saitoh et al.
Iida Jun-ichi
Saitoh Tadashi
Takeda Katsumi
Takeuchi Takashi
Hitachi , Ltd.
Levy Stuart S.
Nguyen Tan
LandOfFree
Apparatus for tracking an optical disc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for tracking an optical disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for tracking an optical disc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-773923