Optical recording medium and method for correcting angular deviation thereof
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United States of America Patent
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Nov 14, 1989
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 or a skew of an optical recording medium in the reading/writing of data from or into the medium and a specific optical recording medium to which this method and apparatus are applicable. The optical recording medium comprises strip patterns formed on part of a substrate. This optical recording medium is relatively moved in a direction of the width of the strip patterns with respect to a pattern detecting device so that an optical system of the pattern detecting device detects the patterns at plural detecting points along the length of the strip patterns. A correction control device counts the number of the strip patterns passed, according to the relative movement as mentioned above and compares the count values at the respective detecting points to detect an angular deviation amount in a plane of the optical recording medium. The angular deviation is corrected by a rotation drive mechanism based on the detected angular deviation amount and direction of the deviation.
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