Optical pickup apparatus utilizing a diffraction device

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

G - Physics

11

B

88/0.11

G11B 7/125 (2006.01) G02B 27/10 (2006.01) G02B 27/44 (2006.01) G11B 7/09 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2007619

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 are 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.

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