Optical disc having oscillating land and grooves
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 26, 2000
Issued Date -
N/A
app pub date -
Sep 21, 1999
filing date -
Oct 25, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
One or more optical discs, each having a ROM field having information with a length of at least one track formed in convex and concave pit rows, and a rewritable field capable of rewriting the information with a length of at least one track, an information unrecorded field having a length of at least one track located between the ROM field and rewritable field, the rewritable field having a spiral or concentric guide track oscillating in a radial direction, the ROM field having spiral or concentric convex and concave pit rows, and at least a part field at the rewritable field side of the information unrecorded field has a transition field having a spiral or concentric guide track oscillating in the radial direction continuously or intermittently and a track pitch To of the ROM field and a track pitch Tw between grooves and lands of the rewritable field have values such that To>Tw.
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