Optical phase-change disc having a grooved substrate, with the groove having specific wobbled and non-wobbled regions
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United States of America Patent
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Sep 5, 2000
Issued Date -
N/A
app pub date -
Aug 17, 1998
filing date -
Jun 14, 1996
priority date (Note) -
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Abstract
An optical phase-change disc comprises a substrate having thereon a spiral groove or concentric grooves for guiding a focused light beam, and a layer structure including a recording layer and protective layers sandwiching therebetween the recording layer. The groove has wobble for recording ATIP (absolute time information) or ADIP (address information). The following relationship between the groove width GW, beam diameter R.sub.0 and wobble amplitude a.sub.w : 0.25.ltoreq.GW/R.sub.0 .ltoreq.0.45 or 0.65.ltoreq.GW/R.sub.0 ; and 0.03.ltoreq.a.sub.w /GW.ltoreq.0.08 hold for preventing distortion of the groove caused by repeated overwriting operation to improve reliability of the optical disc.
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