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Optical information recording medium

  • US 5,191,565 A
  • Filed: 06/10/1991
  • Issued: 03/02/1993
  • Est. Priority Date: 06/19/1989
  • Status: Expired due to Term
First Claim
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1. An optical information recording medium, comprising an active layer which undergoes a base change upon irradiation with light;

  • and protective layers which are formed on both sides of the active layer, which have a higher melting point than that of the active layer and which show no absorption at the wavelength of the irradiated light, wherein the thermal capacity Ma of the active layer and the thermal capacity Md1 of the protective layer on the side to be irradiated with light have the following relationship;

    Ma≦

    Md1 /3, and said active layer has a characteristic such that its minimum cyrstallization time is 90 ns or less.

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