Optical recording medium

Abstract

An optical recording medium using Sn as the recording material to improve the jitter is provided, in which on the surface of a disc substrate 11 where a concave and convex shape dividing a track area is formed, are formed on the surface of the concave and convex shape a first protective layer 31 for protecting at least an optical recording layer 31, an optical recording layer 12 using a chemical compound at least composed of tin (Sn), nitrogen (N) and oxygen (O), formed on the first protective layer, a second protective layer 32 for protecting this optical recording layer, formed on this optical recording layer, and a light-transmittable layer 13 formed on the second protective layer; with this structure, the optical recording layer 12 under high temperature and high humidity can be stabilized by means of the first and second protective layers 31 and 32.

1 . An optical recording medium including a substrate at the surface of which a concave and convex shape determining a track area is formed, the optical recording medium comprising:
 a first intermediate layer formed over the surface of said substrate;   an optical recording layer formed over the first intermediate layer, the optical recording layer using a chemical comprised of tin (Sn), nitrogen (N) and oxygen (O);   a second intermediate layer formed over the optical recording layer; and   a light-transmittable layer formed over the second intermediate layer.   
   
   
       2 . The optical recording medium according to  claim 1 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       3 . The optical recording medium according to  claim 2 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       4 . The optical recording medium according to  claim 3 , wherein the optical recording layer is made of a chemical compound comprised of tin (Sn), nitrogen (N) and Oxygen (O), and whose composition satisfies Sn x N y O z  (x, y, z: atomic %) where x, y, z are selected to be 30<x<70 (atomic %), 1<y<20 (atomic %), and 20<z<60 (atomic %). 
   
   
       5 . The optical recording medium according to  claim 3 , wherein the optical recording layer is made of a chemical compound comprised of tin (Sn), nitrogen (N) and oxygen (O) with palladium (Pd) contained, and whose composition satisfies (Sn x N y O z )( 1-a )Pd a  (x, y, z, a: atomic %) where x, y, z, a are selected to be 30<x<70 (atomic %), 1<y<20 (atomic %), 20<z<60 (atomic %), and 1<a<20 (atomic %). 
   
   
       6 . The optical recording medium according to  claim 4 , wherein at least one of recording and reproduction is performed on the optical recording layer through an objective lens having a numerical aperture of 0.85.+−.0.05 with a laser beam having a wavelength of 380 nm to 420 nm. 
   
   
       7 . The optical recording medium according to  claim 5 , wherein at least one of recording and reproduction is performed on the optical recording layer through an objective lens having a numerical aperture of 0.85.+−.0.05 with a laser beam having a wavelength of 380 nm to 420 nm. 
   
   
       8 . The optical recording medium according to  claim 1 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       9 . The optical recording medium according to  claim 1 , wherein the first and second protective layers have a thickness in the range of 10 nm to 200 nm. 
   
   
       10 . The optical recording medium according to  claim 9 , wherein the first and second protective layers have a thickness in the range of 50 nm to 60 nm. 
   
   
       11 . The optical recording medium according to  claim 1 , wherein the recording layer has a thickness in the range of 10 nm to 200 nm. 
   
   
       12 . The optical recording medium according to  claim 1 , wherein the recording layer has a thickness in the range of 30 nm to 60 nm. 
   
   
       13 . The optical recording medium according to  claim 1 , wherein the depth of grooves formed via the convex and concave shape are in the range of 20 nm to 100 nm. 
   
   
       14 . The optical recording medium according to  claim 4 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       15 . The optical recording medium according to  claim 14 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       16 . The optical recording medium according to  claim 5 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       17 . The optical recording medium according to  claim 16 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       18 . The optical recording medium according to  claim 1 , wherein the optical recording layer uses a chemical comprised of tin (Sn), nitrogen (N) and oxygen (O) and palladium (Pd). 
   
   
       19 . A method for manufacturing an optical recording medium including a substrate at the surface of which a concave and convex shape determining a track area is formed, the method for manufacturing the optical recording medium comprising:
 forming a first intermediate layer formed over the surface of said substrate;   forming an optical recording layer formed over the first intermediate layer, the optical recording layer using a chemical comprised of tin (Sn), nitrogen (N) and oxygen (O);   forming a second intermediate layer formed over the optical recording layer; and   forming a light-transmittable layer formed over the second intermediate layer.   
   
   
       20 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       21 . The method of manufacturing an optical recording medium according to  claim 20 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       22 . The method of manufacturing an optical recording medium according to  claim 21 , wherein the optical recording layer is made of a chemical compound comprised of tin (Sn), nitrogen (N) and Oxygen (O), and whose composition satisfies Sn x N y O z  (x, y, z: atomic %) where x, y, z are selected to be 30<x<70 (atomic %), 1<y<20 (atomic %), and 20<z<60 (atomic %). 
   
   
       23 . The method of manufacturing an optical recording medium according to  claim 21 , wherein the optical recording layer is made of a chemical compound comprised of tin (Sn), nitrogen (N) and oxygen (O) with palladium (Pd) contained, and whose composition satisfies (Sn x N y O z )( 1-a )Pd a  (x, y, z, a: atomic %) where x, y, z, a are selected to be 30<x<70 (atomic %), 1<y<20 (atomic %), 20<z<60 (atomic %), and 1<a<20 (atomic %). 
   
   
       24 . The method of manufacturing an optical recording medium according to  claim 22 , wherein at least one of recording and reproduction is performed on the optical recording layer through an objective lens having a numerical aperture of 0.85±0.05 with a laser beam having a wavelength of 380 nm to 420 nm. 
   
   
       25 . The method of manufacturing an optical recording medium according to  claim 23 , wherein at least one of recording and reproduction is performed on the optical recording layer through an objective lens having a numerical aperture of 0.85±0.05 with a laser beam having a wavelength of 380 nm to 420 nm. 
   
   
       26 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       27 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the first and second protective layers have a thickness in the range of 10 nm to 200 nm. 
   
   
       28 . The method of manufacturing an optical recording medium according to  claim 27 , wherein the first and second protective layers have a thickness in the range of 50 nm to 60 nm. 
   
   
       29 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the recording layer has a thickness in the range of 10 nm to 200 nm. 
   
   
       30 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the recording layer has a thickness in the range of 30 nm to 60 nm. 
   
   
       31 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the depth of grooves formed via the convex and concave shape are in the range of 20 nm to 100 nm. 
   
   
       32 . The method of manufacturing an optical recording medium according to  claim 22 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       33 . The method of manufacturing an optical recording medium according to  claim 32 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       34 . The method of manufacturing an optical recording medium according to  claim 23 , wherein the first intermediate layer is comprised of a tin oxide. 
   
   
       35 . The method of manufacturing an optical recording medium according to  claim 34 , wherein the second intermediate layer is comprised of a silicon oxide. 
   
   
       36 . The method of manufacturing an optical recording medium according to  claim 19 , wherein the optical recording layer uses a chemical comprised of tin (Sn), nitrogen (N) and oxygen (O) and palladium (Pd).