Optical information recording and or reproducing apparatus and m

Details Optical information recording and or reproducing apparatus and m Optical information recording and or reproducing apparatus and m

1997-09-08

1998-06-16

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4432, 369 4434, 369 4436, G11B 7095

Patent

active

057682275

ABSTRACT:
An optical information recording and/or reproducing apparatus includes an optical head for irradiating an optical information recording medium having a plurality of information tracks with a light beam, a photosensor which detects light received via the optical information recording medium and is split into a plurality of sections, and signal generating device for generating a focusing error signal, a tracking error signal, and a sum signal as a sum total of outputs from the split sections of the photosensor on the basis of outputs from the photosensor. In the apparatus, a correction signal is generated such that the phase and amplitude of the correction signal match a phase and an amplitude of crosstalk components included in the focusing error signal on the basis of the tracking error signal and the sum signal obtained when the light beam crosses the information tracks. The correction signal is applied to a focusing servo loop so as to cancel the crosswalk components included in the focusing error signal.

REFERENCES:
patent: 4858214 (1989-08-01), Baba
patent: 4955011 (1990-09-01), Baba
patent: 5199011 (1993-03-01), McDonald et al.

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