Tracking control apparatus of optical disc apparatus and method

Details Tracking control apparatus of optical disc apparatus and method Tracking control apparatus of optical disc apparatus and method

1997-09-04

1999-10-05

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 32, G11B 700

Patent

active

059635169

ABSTRACT:
A tracking control apparatus of an optical disc apparatus capable of preventing unstability of the tracking control due to the deviation of balance of a tracking error signal due to a movement of the field of vision of an object lens. A hysteresis tracking error signal is generated by masking a signal of a half cycle of an off-track state of a tracking error signal at the time of a high speed feeding of a sled and the tracking servo control is carried out by using this signal. Namely, with respect to a tracking error signal calculated at a tracking error calculation circuit, a transistor is turned off by an inverted ENABLE signal indicating the state immediately after the high speed feeding of sled, thereby to make the mirror signal valid, the transistor is turned on when this mirror signal is at a high level indicating the detrack state, a hysteresis tracking error signal obtained by reducing the tracking error signal to the ground level is generated, and the tracking servo control is carried out by using this signal. The component of deviation of the tracking error signal due to the movement of the field of vision of the object lens is reduced to a half, therefore the oscillation of the tracking servo control due to an increase of the accumulation of error can be prevented.

REFERENCES:
patent: 4669072 (1987-05-01), Miura et al.
patent: 4932013 (1990-06-01), Kojima et al.
patent: 4974220 (1990-11-01), Harada
patent: 5138596 (1992-08-01), Yamada
patent: 5247501 (1993-09-01), Hashimoto et al.
patent: 5426625 (1995-06-01), Bui et al.
patent: 5650987 (1995-01-01), Kadowaski
"Optical Disc Technology", Supervised by Morio Onoe, Radio Gijutsusha, Published Oct. 1, 1989, pp. 91-98.

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