Optical information recording and/or reproducing apparatus impro

Details Optical information recording and/or reproducing apparatus impro Optical information recording and/or reproducing apparatus impro

1996-03-13

1999-02-23

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, G11B 709

Patent

active

058751629

ABSTRACT:
An optical information recording and/or reproducing apparatus, for performing at least one of recording and reproduction of information as irradiating a recording medium with a light beam, includes an actuator for moving the light beam relative to the medium, a position detecting circuit for detecting a position of the actuator, a circuit for generating a relative position error signal of the light beam to the medium, a control loop for controlling the actuator in accordance with the relative position error signal, a filter for differentiating an output from the position detecting circuit, and an adder for adding an output from the filter to a signal in the control loop. Another optical information recording and/or reproducing apparatus includes an actuator for moving the light beam relative to the medium in a direction traversing the tracks of the medium, a velocity detecting circuit for detecting a velocity of the actuator and outputting a real velocity signal, a circuit for generating a target moving velocity of the light beam, a control loop for controlling the velocity of the actuator, based on the real velocity signal and target velocity signal, a filter for differentiating the real velocity signal, and an adder for adding an output from the filter to a signal in the control loop.

REFERENCES:
patent: 4858214 (1989-08-01), Baba
patent: 4955011 (1990-09-01), Baba
patent: 5063549 (1991-11-01), Yamamura
patent: 5090001 (1992-02-01), Ito et al.
patent: 5268888 (1993-12-01), Terada
patent: 5377096 (1994-12-01), Ono
patent: 5416756 (1995-05-01), Takeshita et al.
patent: 5452275 (1995-09-01), Ogawa

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