Optical disk substrate, optical disk, and method of forming the same
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United States of America Patent
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Aug 2, 2005
Grant Date -
Oct 21, 2004
app pub date -
Aug 29, 2003
filing date -
Apr 17, 2003
priority date (Note) -
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Abstract
An optical disk substrate with a central hole is disclosed in the invention. The optical disk substrate includes: a first annular area for clamping, which surrounds the outer edge of the central hole and includes a first upper surface and a first lower surface thereon; and a second annular area for forming an information storing area, which surrounds the outer edge of the first annular area and includes a second upper surface and a second lower surface thereon; besides, the first lower surface and the second lower surface are on the same plane, whereas the first upper surface is higher than the second upper surface. Moreover, an optical disk that applies the optical disk substrate and a method for forming the optical disk are also disclosed in the invention.
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