Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

G - Physics

11

B

88/0.13, 352/32.

G11B 7/135 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01)

Patent

CA 1324516

ABSTRACT OF THE DISCLOSURE An optical pickup apparatus is disclosed for reproducing information from an optical recording medium such as a compact disc. The apparatus includes a laser device; one or more diffraction devices; and a photodetector receiving a laser beam diffracted by the diffraction device. The surfaces of the diffraction device are provided with an antireflection coating. When the apparatus is used for the three-beam method of information reproduction, the two photodetecting areas in the photodetector for producing the tracking error signal are different in size or in the positional relation with the laser device.

603765

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