Super-resolution optical disc reader and read method optimized through reflectivity measurement
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United States of America Patent
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Jan 15, 2013
Grant Date -
Mar 31, 2011
app pub date -
Sep 24, 2010
filing date -
Sep 29, 2009
priority date (Note) -
Expired
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Abstract
The invention relates to the field of the optical recording of information on a medium, such as an optical disc. To read an optical disc in super-resolution mode, a procedure for optimizing the power of the read laser beam is implemented. This optimization is based on the observation that a correlation exists between the power allowing the disc to be read without risk in super-resolution mode and the reflectivity of the sensitive layer containing the information. The reflectivity of the optical disc is measured for several power levels of the read laser, a critical power is determined on the basis of the reflectivity measurements made, and a read power sufficiently above the critical power, so as to be well outside a range of power levels entailing risks, is selected according to the critical power.
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