Optical information recording medium

  • US 5,090,009 A
  • Filed: 04/14/1989
  • Issued: 02/18/1992
  • Est. Priority Date: 07/30/1988
  • Status: Expired due to Term
First Claim
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1. An optical information recording medium comprising a light transmitting substrate, a light absorptive layer having a complex refractive index comprised of a real part of said complex refractive index (nabs) and an imaginary part of said complex refractive index (kabs), said absorptive layer having a thickness (dabs), said 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 ρ

  • =nabs dabs

    where λ

    is the wavelength of a reading laser beam, meets the inequality 0.05≦


    0.6, and the imaginary part kabs of the complex refractive index of the light absorptive layer is at most 0.3.

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