光学式情報記録部材

Optical information recording member

Abstract

(57)【要約】 【課題】結晶化に要する照射光のパワーが小さく、かつ 繰り返しオーバーライト特性、変調度、並びに光学設計 における柔軟性の性能に優れた光学式情報記録部材を提 供する。 【解決手段】本発明の光学式情報記録部材は、照射光を 透過できる透明な基材と、カルコゲン系合金を主成分と する記録層と、該記録層を挟んでその上下に形成した保 護層と、を備え、該保護層が、ZnSおよびZnSeの 少なくとも1種と、SiO 2 、GeO 2 、SnO 2 、Te O 2 、ZrO 2 、Al 2 O 3 、Y 2 O 3 、Ta 2 O 5 の少なくと も一種の酸化物と、を有する光学式情報記録部材であっ て、該保護層に含まれる元素のうちZnと該酸化物を構 成する金属元素との全体量を100原子%とすると、該 金属元素が35〜65原子%であることを特徴とする。
PROBLEM TO BE SOLVED: To make the power of irradiation light required for crystallization smaller by incorporating the metallic elements among the metallic elements constituting oxides with Zn of the elements to be incorporated into this protective layer at such a ratio as to have atomic% of a specific range of the entire amt. of these elements. SOLUTION: This medium has a transparent base material which allows the transmission of irradiation light, a recording layer which consists essentially of a chalcogen based alloy and the protective layer which is formed above and below the recording layer across this layer. The protective layer has at least one kind of ZnS and ZnSe and at least one kind of the oxides among SiO 2 , GeO 2 , SnO 2 , TeO 2 , ZrO 2 , Al 2 O 3 , and Ta 2 O 5 . If the entire amt. of the metallic elements constituting these oxides with the Zn is defined as 100 atm.% the content of these metallic elements is so determined as to attain 35 to 65 atom.%. The degradation in the thermal diffusion efficiency of the protective layer is resulted with the optical information recording medium constituted in such a manner and, therefore, the smaller power of the irradiation light necessary for noncrystallization is necessitated and the smaller energy for emission of the irradiation light is necessitated. COPYRIGHT: (C)1998,JPO

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    US-7041430-B2May 09, 2006Hitachi, Ltd.Information recording media, manufacturing technique and information recording method