Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

1993-04-28

1995-04-18

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369 4432, 369103, 369112, G11B 7135

Patent

active

054084504

ABSTRACT:
An optical pickup apparatus for reproducing information from an optical recording medium such as a compact disc comprising: 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, the two photodetecting areas in the photodetector for producing the tracking error signal are different in size and in positional relation to the laser device.

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patent: 4904856 (1990-02-01), Nagahana et al.
"Hecht Optics, Second Edition", Hecht, "Antireflection Coatings", 1987, pp. 375-376.
"The Photonics Dictionary" 37th international Edition, 1991, p. D-7.

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