Optical recording medium with different wobble characteristics between the user data area and the lead-out area
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United States of America Patent
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Apr 29, 2008
Grant Date -
Feb 22, 2007
app pub date -
Oct 27, 2006
filing date -
Jun 18, 2001
priority date (Note) -
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Abstract
An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
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