Optical recording/reproducing device having means for adjusting

Details Optical recording/reproducing device having means for adjusting Optical recording/reproducing device having means for adjusting

1991-06-18

1993-03-30

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, 369 4441, G11B 709

Patent

active

051990156

ABSTRACT:
An optical recording and playback device for irradiating a light beam spot on a track of a data carrying medium at a target condition includes a servo error signal detector for detecting a deviation, such as defocus amount or off-tracking amount, of the light beam spot from the target condition. A servo circuit defining a servo loop with the servo error signal detector is provided for generating drive signals for driving actuators which control the movement of the light beam generator. A reference signal generator generates a reference signal to the servo loop. A complex amplitude calculation is carried out for calculating a complex amplitude of the frequency component of the reference signal applied to the servo loop. From the complex amplitude of the previously stored reference signal, a gain characteristics of the servo loop and a servo loop phase are calculated. An adjustment circuits are provided for changing the gain characteristics of the servo loop and the servo loop phase.

REFERENCES:
patent: 4755980 (1988-07-01), Yoshimaru et al.
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 4942564 (1990-07-01), Hofer et al.
patent: 5084849 (1992-01-01), Ishii et al.

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