Optical disk apparatus, tracking control circuit therefor, and m

Details Optical disk apparatus, tracking control circuit therefor, and m Optical disk apparatus, tracking control circuit therefor, and m

1996-08-09

1998-08-11

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, G11B 7095

Patent

active

057937222

ABSTRACT:
In this invention, when a command indicating movement to a land or groove is output while a beam condensed by an objective lens tracks a groove or land, the polarity is inverted, and a jump pulse is generated. Tracking servo control is stopped during generation of the jump pulse, thereby changing the tracking position from the groove or land to the land or groove. With this operation, the tracking position can be accurately changed from the groove or land to the land or groove for an optical disk having concentric or spiral grooves and lands as recording tracks. Also in this invention, when a switching position is detected while the beam condensed by the objective lens tracks the groove or land, the polarity is inverted. At the same time, tracking servo control is stopped to change the tracking position from the groove or land to the land or groove. With this operation, the tracking position can be accurately changed from the groove or land to the land or groove in an optical disk in which lands and grooves are alternately formed in units of rounds and linked together.

REFERENCES:
patent: 4974220 (1990-11-01), Harada
patent: 5166915 (1992-11-01), Fuldner et al.
patent: 5199022 (1993-03-01), Suzuki et al.
patent: 5444682 (1995-08-01), Yamada et al.
patent: 5615185 (1997-03-01), Horikiri
Patent Abstract of Japan, vol. 009, No. 024 (P-331) Jan. 1985 re JP-A 59168939.
Patent Abstract of Japan, vol. 012, No. 290 (P-742) Aug. 1988 re JP-A 63066734.
Patent Abstract of Japan, vol. 006, No. 125 (P-127) Jul. 1982 re JP-A 57050330.

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