Apparatus for controlling bias amount of focus error signal

Details Apparatus for controlling bias amount of focus error signal Apparatus for controlling bias amount of focus error signal

1996-12-23

1998-05-12

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4425, G11B 709

Patent

active

057516740

ABSTRACT:
An optical information reproducing and/or recording system is provided with an optical system for irradiating a light beam to an information record surface of an information record medium and detecting the light beam reflected from the information record surface to output a light detection signal, an amplifying device for amplifying the light detection signal and generating a focus error signal which indicates an error of a focus point of the light beam with respect to the information record surface, and a feed back device for feeding back the focus error signal in the focus servo loop to change the focus point in accordance with a level of the focus error signal. An apparatus for controlling a bias amount of the focus error signal is provided with: a superimposing device for superimposing a disturbance signal to flutter the focus point with respect to the information record surface, onto the focus error signal; an error amount detecting device for detecting a focus error amount of the focus point, on the basis of the light detection signal outputted when the disturbance signal is superimposed; a parameter calculating device for calculating a gain parameter corresponding to an amplification factor of the amplifying device, and a sensitivity parameter corresponding to a detection sensitivity of the optical system; and a bias amount calculating device for calculating the bias amount.

REFERENCES:
patent: 5010538 (1991-04-01), Takeda et al.
patent: 5109367 (1992-04-01), Yoshikawa
patent: 5363357 (1994-11-01), Niwayama
patent: 5475664 (1995-12-01), Shimizume et al.
patent: 5600615 (1997-02-01), Kiyoura et al.
patent: 5610886 (1997-03-01), Hayashi et al.
patent: 5642340 (1997-06-01), Nomura

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