Head seek control apparatus continuously detects and compensates

Details Head seek control apparatus continuously detects and compensates Head seek control apparatus continuously detects and compensates

1994-05-18

1996-05-21

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, G11B 7085

Patent

active

055196780

ABSTRACT:
An actuator of an Optical disk unit is controlled to convey an optical head to a target track in accordance with a tracking error signal and an acceleration pattern signal of the actuator. The acceleration pattern signal is integrated to obtain a commanded velocity of the actuator, and the tracking error signal is processed to determine a displacement velocity of the actuator. Also, a reference tracking error is determined in accordance with a variation of the displacement velocity. The commanded velocity, displacement velocity and reference tracking error are compared to obtain an error signal indicative of a difference between the commanded velocity and an actual displacement velocity of the actuator. The error signal is then differentiated and used to adjust the acceleration pattern signal, and the thus corrected acceleration pattern signal is used to drive the actuator.

REFERENCES:
patent: 5307333 (1994-04-01), Ikeda et al.
patent: 5311490 (1994-05-01), Matoba et al.
patent: 5394386 (1995-02-01), Park et al.

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