Optical information recording medium and method of manufacturing
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United States of America Patent
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Oct 27, 1998
Issued Date -
N/A
app pub date -
Jun 25, 1997
filing date -
May 17, 1995
priority date (Note) -
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Abstract
An optical information recording medium which can be played back by both a playback system for an SD (Superdensity Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk). The optical information recording medium comprises a first transparent substrate which includes a smooth surface, and a first information surface bearing pits correspondent to first recorded information, the first information surface being covered with a semitransparent film which transmits part of a playback beam and reflects part thereof; and a second transparent substrate which includes a smooth surface, and a second information surface bearing pits correspondent to second recorded information, the second information surface being covered with a reflective film which reflects the greater part of the playback beam; the second transparent substrate being stacked on the first transparent substrate with the first information surface of the latter overlaid by the smooth surface of the former.
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