Optical information processing apparatus and method of controlli

Details Optical information processing apparatus and method of controlli Optical information processing apparatus and method of controlli

1991-10-07

1996-02-06

Hindi, Nabil Z.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44280, 369 44120, 369112000, 369 44410, G11B 700

Patent

active

054901332

ABSTRACT:
An optical information processing apparatus comprising a diffraction grating for producing a zero-order beam which is a beam emitted by a light source and allowed to pass therethrough and two plus and minus first-order sub-beams respectively having positive and negative astigmatisms, radiated in directions at slight angles different from the main beam, wherein said two sub-beams are focused at opposite positions across said main beam, wherein focusing control is performed by a focusing error signal detected from a difference of signal amplitudes obtained from the respective reflected light quantities of said two sub-beams and wherein tracking control is performed by an off-track signal obtained from a signal according to a reflected light quantity of said main beam. In an apparatus for magneto-optically reproducing information, above all else, a wave plate is inserted between the focusing lens and the separating optical system, thereby increasing the reflected light quantities and stabilizing the magneto-optical signal, focusing signal and tracking signal.

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patent: 5132948 (1992-07-01), Ishibashi
patent: 5144131 (1992-09-01), Opheij et al.
Webster's Ninth New Collegiate Dictionary by Merrian Webster 1986 p. 111.

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