Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reissue Patent
2003-12-31
2010-06-08
Huber, Paul (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053280
Reissue Patent
active
RE041372
ABSTRACT:
An optical disc apparatus includes: a converging section for converging a light beam and irradiating a rotating information medium with the converged light beam; a moving section for moving the converging section, thereby moving a converging point of the converged light beam in a direction perpendicular to an information surface of the information medium; a converging state detection section for generating a focus servo signal which represents a converging state of the light beam on the information medium based on reflected light or transmitted light of the light beam from the information medium; a focus servo control section for controlling the moving section based on the focus servo signal, so that the light beam reaches a predetermined converging state on the information medium; and a focus pull-in section for turning ON the control by the focus servo control section, wherein the focus pull-in section turns ON the control by the focus servo control section in a case where the focus pull-in section determines that the converging point of the light beam is located in the vicinity of the minimum velocity position on the information medium axial deviation.
REFERENCES:
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 5511050 (1996-04-01), Matsumoto et al.
patent: 6087644 (2000-07-01), Schell
patent: 5-12683 (1993-01-01), None
Japan office action dated Sep. 1, 2003, no english translation provided.
Fujiune Kenji
Kikuchi Jun
Okada Yuu
Watanabe Katsuya
Yamamoto Takeharu
Huber Paul
Panasonic Corporation
Snell & Wilmer L.L.P.
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