Optical pickup apparatus utilizing a diffraction device

Details Optical pickup apparatus utilizing a diffraction device Optical pickup apparatus utilizing a diffraction device

1990-01-12

1992-07-07

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, G11B 700

Patent

active

051289148

ABSTRACT:
An optical pickup apparatus comprising a diffraction device in which a laser beam from a light source is diffracted by the diffraction device to produce a main beam and two sub-beams which are focused on a recording medium, the beams reflected from the recording medium aare diffracted by the diffraction device to be directed to at least one photodetector, whereby a tracking error signal can be detected from output signals of the photodetector by the three-spot method that is so highly reliable that an offset never arises in the tracking error signal even when the optical axis of the optical system is displaced from a given position.

REFERENCES:
patent: 4742506 (1988-05-01), Fukumoto et al.
patent: 4750162 (1988-06-01), Tajima

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