Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-07-23
1999-01-12
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369112, G11B 700
Patent
active
058598189
ABSTRACT:
A tilt servo apparatus in an optical disc reproducing apparatus operates promptly and certainly when reading recording information of an optical disc recorded at high density. The tilt servo apparatus is used in an optical disc reproducing apparatus having an optical pickup including a liquid crystal panel for an aberration correction on which a transparent electrode is formed and divided into segments of predetermined shapes, and irradiating a laser beam via the liquid crystal panel for the aberration correction and the objective lens, and receiving an obtained reflection light. The tilt servo apparatus has: tilt detecting for detecting a signal corresponding to a tilting angle in a radial direction between the information recording surface of the optical disc and an optical axis of the objective lens; and a driving circuit for variably driving voltages which are applied to the divided portions of the liquid crystal panel, respectively. The driving circuit drives so that predetermined voltages are applied to the respective divided segments of the liquid crystal panel according to a detection output of the tilt detecting and a phase difference between respective laser beams passing through the divided portions is adjusted, thereby correcting the aberration of the objective lens inclined at the tilting angle relative to the information recording surface of the optical disc.
REFERENCES:
patent: 5301175 (1994-04-01), Nakamura
patent: 5388105 (1995-02-01), Takagi et al.
patent: 5430699 (1995-07-01), Matsubara et al.
patent: 5442615 (1995-08-01), Ohsato et al.
patent: 5515348 (1996-05-01), Ohsato
patent: 5657303 (1997-08-01), Namoto et al.
patent: 5699340 (1995-12-01), Lee et al.
patent: 5742578 (1995-11-01), Kumai et al.
Murao Noriaki
Ohtaki Sakashi
Tateishi Kiyoshi
Hindi Nabil
Pioneer Electronic Corporation
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