OPTICAL DISC AND OPTICAL DISC APPARATUS
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United States of America Patent
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N/A
Issued Date -
Oct 23, 2008
app pub date -
Apr 16, 2008
filing date -
Apr 18, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An optical disc includes a SPOKE potion for detecting a position in a circumferential direction of the optical disc, which is formed on an inner or outer circumferential side relative to a data recording area and visible image drawing area. A signal portion in which each signal is constituted by a pair of light nonreflecting portion and light reflecting portion is formed in the SPOKE portion. The signal portion includes a first signal portion in which signal widths of the nonreflecting portion and reflecting portion are the same and a second signal portion in which the signal widths of the nonreflecting portion and reflecting portion are changed.
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