Optical head for optical disk system

Details Optical head for optical disk system Optical head for optical disk system

1989-11-06

1991-10-29

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 4441, G11B 712

Patent

active

050620940

ABSTRACT:
An optical head for use in an optical disk system for irradiating a laser beam on an optical disk for recording or reproducing information. The optical head comprises a first and a second diffraction gratings for forming a moire pattern for detecting a focusing error, and a third diffraction grating for detecting a tracking error. The third diffraction grating has strips extending in a direction perpendicular to directions in which the strips of the first and second diffraction gratings extend.

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Applied Optics, vol. 13, No. 6, Jun. 1974, pp. 1322-1326, "Focusing Errors in Collimating Lens or Mirror: Use of a Moire Technique".

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