Optical pickup device

Details Optical pickup device Optical pickup device

1998-10-13

2000-10-24

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 700

Patent

active

06137752&

ABSTRACT:
An optical pickup device used for optical information processing instruments includes a light source for emitting an outgoing light toward a recording medium, a diffraction grating for separating the outgoing light from the light source into a main beam and at least two sub-beams, an objective lens for independently focusing the main beam and sub-beams separated via the diffraction grating on the recording medium, a hologram formed by areas divided into 2.sup.n+1 for dividing a reflected light having passed through the objective lens after being reflected by the recording medium into a first diffracted beam and a second diffracted beam having different focusing distances from each other to diffract the first and second diffracted beams to one direction of the outgoing light axis of the light source, and a single photodetector having a first light receiving element divided-by-three for accepting the first diffracted beam and a second light receiving element divided-by-three for accepting the second diffracted beam to detect a focus error signal, thereby accurately detecting the focus error signal with only one photodetector without involving variation.

REFERENCES:
patent: 4731772 (1988-03-01), Lee

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