Construction of optical disk
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United States of America Patent
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Mar 19, 1996
Issued Date -
N/A
app pub date -
Feb 8, 1994
filing date -
Oct 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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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