Optical information recording medium
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United States of America Patent
Stats
-
Feb 18, 1992
Grant Date -
N/A
app pub date -
Apr 14, 1989
filing date -
Jul 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical information recording medium comprising a light transmitting substrate, a light absorptive layer overlaying the substrate to absorb a laser beam and a light reflective layer overlaying the light absorptive layer, wherein an optical parameter represented by .rho.=n.sub.abs d.sub.abs /.lambda. where n.sub.abs is the real part of the complex refractive index of the light absorptive layer, d.sub.abs is the thickness of the light absorptive layer and .lambda. is the wavelength of a reading laser beam, is 0.05.ltoreq..rho..ltoreq.0.6, and the imaginary part k.sub.abs of the complex refractive index of the light absorptive layer is at most 0.3.
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