Optical information recording apparatus and method capable of co

Details Optical information recording apparatus and method capable of co Optical information recording apparatus and method capable of co

1997-10-20

1999-05-18

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 58, 235454, G11B7/095

Patent

active

059057025

ABSTRACT:
A magnetooptical information recording-reproducing apparatus is adapted to function for any card-like optical recording media having different properties. A light beam is applied to a predetermined location of the recording medium and a reflected light caused upon the application of the light beam is detected so as to detect the property of the recording medium such as a reflectance. The gains of a signal reproducing system, a tracking control system and a focusing control system are controlled to vary according to the detection result concerning the property of the recording medium so that a reproduction signal, a tracking error signal and a focusing error signal assume predetermined levels, respectively.

REFERENCES:
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5042020 (1991-08-01), Endo
patent: 5113061 (1992-05-01), Tanaka
patent: 5128920 (1992-07-01), Yamamuro

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