Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1986-12-17
1989-09-12
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, 369100, 369275, G11B 7095, G11B 724
Patent
active
048666882
ABSTRACT:
A tracking servo system includes in addition to a composite servo system composed of a push-pull track deviation detecting loop operative with pregrooves formed in an optical disc and a wobbling track deviation detecting loop operative with intermittently provided wobbled tracking marks, an offset correcting loop for detecting offset component possibly produced due to tilt, deformation and eccentricity of a recording medium or change in optical and mechanical parameters in the course of time lapse to drive forcibly a light spot by applying an electrical offset to cancel out the offset component. In the offset correcting loop, light reflected by wobbled tracking marks provided intermittently or mirror areas formed by interrupting intermittently the pregroove is utilized for detecting the offset component.
REFERENCES:
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4663751 (1987-05-01), Kaku et al.
patent: 4707816 (1987-11-01), Yonezawa et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
Fukui Yukio
Ichino Kazuo
Kaku Toshimitsu
Maeda Takeshi
Ohtake Masatoshi
Hitachi , Ltd.
Psitos Aristotelis M.
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