Optical information recording and/or reproducing apparatus capab

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

1995-10-04

1998-03-24

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4427, G11B 709

Patent

active

057320527

ABSTRACT:
An optical information recording and/or reproducing apparatus is arranged to record and/or reproduce information on or from a recording medium with a light beam. The apparatus includes a circuit for generating a focusing error signal of the light beam, a filter for filtering the focusing error signal, the attenuation factor of the filter being greater at a high frequency region, a circuit for selecting either a focusing error signal filtered by the filter or a focusing error signal not filtered by the filter in accordance with an operating mode of the apparatus, and a circuit for executing focusing control of the light beam, using the selected focusing error signal.

REFERENCES:
patent: 4786794 (1988-11-01), Doi
patent: 4891798 (1990-01-01), Shinkai
patent: 5199011 (1993-03-01), McDonald et al.
patent: 5347502 (1994-09-01), Yamada et al.
patent: 5477514 (1995-12-01), Watanabe et al.

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