Method and apparatus for correcting angular deviation of optical recording medium
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United States of America Patent
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Sep 27, 1988
Grant Date -
N/A
app pub date -
Nov 25, 1986
filing date -
Nov 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for correcting an angular deviation which is applicable to an optical recording medium comprising a data recording region or regions defined by a reference line or lines having and data tracks perpendicular to the reference line or lines provided in the or each of the data recording regions for correcting an angular deviation on a data recording layer of said optical recording medium when the data is read by said photodetective sensor. The angular deviation is corrected by reading, by a photodetective sensor, a position of a reference line of the optical recording medium within a sight of the photodetective sensor at least at two points in the length of the reference line to detect a deviation of the reference line within the sight of said photodetective sensor from a difference between the positions of the reference line read at said points; detecting an angular deviation from said deviation and a distance between said points where the position of the reference line are detected; and correcting said angular deviation on the basis of the detected angular deviation value.
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