Control device of a pickup head for locating the track position

Details Control device of a pickup head for locating the track position Control device of a pickup head for locating the track position

1998-04-29

2000-11-28

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 700

Patent

active

061544248

ABSTRACT:
A control device to locate the pickup head on the desired position yielded by the operation of seek is taken in two parts. The first part is utilizing the velocity control to prevent the fluctuation problem of the bi-mass system and the second part is switching the operation to the mode of position control gradually, so that the pickup head can reach the destination precisely and minimize the problem of fluctuation and increase the successful rate of the tracking control. Moreover, this invention has utilized a feedforward control to properly compensate the steady state error originated from the characteristics of system or friction, a position feedback control and a switching factor to gradually switch between the modes of velocity and position. Thus, the position and velocity of the sled motor can be controlled at the same time to allow the pickup head to reach the destination smoothly as expected by the designed of the velocity profile. The tracking control therefore is done smoothly.

REFERENCES:
patent: 5038333 (1991-08-01), Chow et al.
patent: 5675558 (1997-10-01), Katoh
patent: 5675562 (1997-10-01), Yanagi
patent: 5917789 (1999-06-01), Iwasaki et al.
patent: 5982721 (1999-11-01), Supino et al.

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