Optical disk medium
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United States of America Patent
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Feb 25, 2003
Grant Date -
N/A
app pub date -
Aug 30, 2000
filing date -
Sep 9, 1999
priority date (Note) -
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Abstract
The optical disk medium permits an increase in recording density using a complex refractive index variation of an inorganic oxide film in a super-resolution medium using an inorganic oxide film. The reflectance of the disk increases due to the complex refractive index variation of the inorganic oxide film. Specifically, in the case where the inorganic oxide film is an oxide film comprising Co, a reflect addition film is provided. The effective spot diameter used for read-out is reduced, thereby increasing recording density. By using a material for which the complex refractive index varies sharply, the recording density can be approximately doubled.
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