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OPTICAL INFORMATION RECORDING MEDIUM AND A FABRICATION METHOD THEREOF, A FABRICATION DEVICE, A RECORDING/REPRODUCING METHOD AND A RECORDING/REPRODUCING DEVICE, PARTICULARLY CORRELATED TO RECORDING/REPRODUCING AN INFORMATION SIGNAL BY RADIATING A HIGH-ENERGY OPTICAL BEAM ON A THIN FILM
OPTICAL INFORMATION RECORDING MEDIUM AND A FABRICATION METHOD THEREOF, A FABRICATION DEVICE, A RECORDING/REPRODUCING METHOD AND A RECORDING/REPRODUCING DEVICE, PARTICULARLY CORRELATED TO RECORDING/REPRODUCING AN INFORMATION SIGNAL BY RADIATING A HIGH-ENERGY OPTICAL BEAM ON A THIN FILM
PURPOSE: An optical information recording medium and a fabrication method thereof, a fabrication device, a recording/reproducing method and a recording/reproducing device are provided to suppress a film thickness difference between an inner side and an outer side within plus/minus 10% over entire areas of a disk, thereby realizing a better signal quality having a low noise level. CONSTITUTION: An optical information recording medium comprises the first information layer(2) between a transparent substrate(1) and a protective substrate(3). The first information layer(2) has a spiral-shaped groove(4) for laser beam guiding, and records/reproduces information by radiating a laser beam(5). The laser beam(5) is condensed into an objective lens(6) from the transparent substrate(1), and is radiated to record/reproduce the information. Additional information layers may be disposed between the first information layer(2) and the protective substrate(3) by inserting each separation layer, respectively.
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