Construction of optical disk

Details Construction of optical disk Construction of optical disk

1994-02-08

1996-03-19

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 369109, 369100, G11B 724

Patent

active

055008496

ABSTRACT:
An optical disk apparatus is provided which includes an incident light optical system which causes a light beam, having a wavefront aberration in which an odd function component with respect to two perpendicular axes corresponding to the radial and tangential directions of an optical disk is contained, to impinge on the disk. The apparatus further comprises a light detecting unit divided into at least two regions by a boundary line corresponding to the radial direction of the optical disk for detecting a light beam guided from the disk, and a computing mechanism which outputs a tracking error signal by computing the output differential between these two or more regions.

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patent: 4956833 (1990-09-01), Kokado et al.
patent: 5031162 (1991-07-01), Morimoto et al.
patent: 5091900 (1992-02-01), LaBudde
patent: 5168490 (1992-12-01), Braat
patent: 5280464 (1994-01-01), Itoh et al.

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