Optical information recording/reproducing apparatus having a com

Details Optical information recording/reproducing apparatus having a com Optical information recording/reproducing apparatus having a com

1996-11-01

1998-08-11

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369112, G11B 709

Patent

active

057937257

ABSTRACT:
An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium and detects a focal error based on a reflected light beam from the optical recording medium. The apparatus includes a composite prism which deflects a part of the reflected light beam to at least two positions excluding a central part of the reflected light beam, and a photodetector device having a plurality of photodetectors which respectively detect the deflected parts of the reflected light beam and output detection outputs. The focal error is detected based on the detection outputs of the photodetector device.

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The Compact Disc Digital Audio System, M.G. Carasso, J.B.H. Peek and J.P. Sinjou, Philips Tech. Rev. 40, 151-155, 1982, No. 6.
"Translation of German Official Action of Jan. 13, 1994" German Patent Application P 43-22-149.1-53.

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