Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-06-20
1999-09-07
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, G11B 7095
Patent
active
059497459
ABSTRACT:
An improved information recording/reproducing apparatus and a method thereof which are capable of performing a tracking control by judging whether a current recording or reproducing position is the track of a land or the track of a groove of a recording medium in a single-side wobbling method and varying the polarity of a tracking control signal in accordance with the judgement signal. The apparatus includes a signal detection unit for detecting lefthand and righthand detection signals from an optical beam with respect to a track center line of the first track or second track and detecting a tracking control signal from the lefthand and righthand detection signals, a land/groove track judgement unit for detecting a maximum value or envelope of the lefthand and righthand detection signals from the signal detection unit and judging whether a track in which the current optical beam is made incident on the first track or the second track, a signal conversion unit for passing-through or inverting the tracking control signal in accordance with a land/groove judgement signal V0 from the land/groove track judgement unit, and a tracking servo unit for performing a tracking control of an optical pickup unit in accordance with a tracking control signal from the signal conversion unit.
REFERENCES:
patent: 5311490 (1994-05-01), Matoba
patent: 5568461 (1996-10-01), Nishiuchi et al.
patent: 5715217 (1998-02-01), Fuji
LG Electronics Inc.
Tran Thang V.
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