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US08216655B2 Optical information recording medium 失效
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Optical information recording medium
Abstract:
An optical information recording medium is provided and includes a supporting substrate, a light-transmissive protective layer, information recording layers, and at least one interlayer transparent to a laser beam having a wavelength of 400 to 410 nm. Among the information recording layers, one or a plurality of information recording layers other than the information recording layer closest to the supporting substrate each function as a semi-transmissive information recording layer that transmits the laser beam. Some or all of the one or the plurality of semi-transmissive information recording layer include, from the laser beam incident side, a first dielectric portion having a refractive index of 2.4 or more for the wavelength of the laser beam, a recording material portion having a thickness of at least 5.2 nm, a second dielectric portion, a metal portion having a thickness of at least 7 nm, and a third dielectric portion in that order.
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