Optical disc apparatus
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United States of America Patent
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Jul 19, 2011
Grant Date -
Apr 29, 2010
app pub date -
Oct 20, 2009
filing date -
Oct 23, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical disc apparatus reliably executes a seek operation even if an optical disc is warped. Tilt adjustment values spanning from the inner circumference to the outer circumference of an optical disc are stored. When seeking from a start address to a destination address, a tilt adjustment value A at the start address and a tilt adjustment address C at the destination address are not directly used. A tilt adjustment value k·C (k<1) is used during a coarse seek operation until the neighborhood of the destination address and a tilt adjustment value C is used during a fine seek operation from the neighborhood of the destination address to the destination address.
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