Optical information recording medium

Abstract

An optical information recording medium includes: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers. At least one of the two or more information signal layers is provided with an inorganic recording layer including Pd oxide, a first protective layer provided on a first main surface of the inorganic recording layer, and a second protective layer provided on a second main surface of the inorganic recording layer. And at least one of the first protective layer and the second protective layer includes a compound oxide of Si oxide, In oxide and Zr oxide as a main component.

1 . An optical information recording medium comprising:
 a substrate;   two or more information signal layers provided on the substrate; and   a cover layer provided on the information signal layers,   wherein at least one layer out of the two or more information signal layers is provided with an inorganic recording layer including Pd oxide, a first protective layer provided on a first main surface of the inorganic recording layer, and a second protective layer provided on a second main surface of the inorganic recording layer, and   at least one of the first protective layer and the second protective layer includes a compound oxide of Si oxide, In oxide and Zr oxide as a main component.   
     
     
         2 . The optical information recording medium according to  claim 1 ,
 wherein any one surface of sides of the substrate and the cover layer is a light irradiation plane irradiated with light in order to record or reproduce information signals on the two or more information signal layers, and   a layer which is opposite to the light irradiation plane out of the first protective layer and the second protective layer includes the compound oxide.   
     
     
         3 . The optical information recording medium according to  claim 1 ,
 wherein both the first protective layer and the second protective layer include the compound oxide as a main component.   
     
     
         4 . The optical information recording medium according to  claim 1 ,
 wherein the inorganic recording layer includes W oxide, Pd oxide and Cu oxide as main components.   
     
     
         5 . The optical information recording medium according to  claim 4 ,
 wherein the inorganic recording layer further includes Zn oxide.   
     
     
         6 . The optical information recording medium according to  claim 1 ,
 wherein any one surface of sides of the substrate and the cover layer is the light irradiation plane irradiated with light in order to record or reproduce information signals on the two or more information signal layers, and   at least one layer out of information signal layers other than an information signal layer which is furthest to the back of the light irradiation plane is provided with the inorganic recording layer, the first protective layer, and the second protective layer, and   at least one of the first protective layer and the second protective layer includes the compound oxide as a main component.   
     
     
         7 . The optical information recording medium according to  claim 1 ,
 wherein any one surface of sides of the substrate and the cover layer is a light irradiation plane irradiated with light in order to record or reproduce information signals on the two or more information signal layers,   an inorganic recording layer of an information signal layer closest to the light irradiation plane out of the two or more information signal layers is provided with the inorganic recording layer, the first protective layer, and the second protective layer, and   at least one of the first protective layer and the second protective layer includes the compound oxide as a main component.   
     
     
         8 . An optical information recording medium comprising:
 a substrate;   two or more information signal layers provided on the substrate; and   a cover layer provided on the information signal layers,   wherein at least one layer out of the two or more information signal layers is provided with an inorganic recording layer including Pd oxide, a first protective layer provided on a first main surface of the inorganic recording layer, and a second protective layer provided on a second main surface of the inorganic recording layer, and   at least one of the first protective layer and the second protective layer includes a compound oxide of In oxide, Ga oxide and Zn oxide as a main component.