Information recording medium

Abstract

An information recording medium including a transparent substrate, and a recording layer or a metallic layer formed on the transparent substrate directly or through an undercoat layer, with an amplitude attenuation time of 1 second or less and/or a vibration frequency attenuation time of 3 seconds or less, when vibrated in the direction perpendicular to the flat surface of said information recording medium, or wherein when the information recording medium is in-plane vibrated in the direction perpendicular to the extending direction of information recording, reproducing and/or deleting tracks, a maximum in-plane deviation of a recording, reproducing or deleting position in the tracks in the perpendicular direction from a correct recording, reproducing or deleting position in the tracks is 12.5×d or less wherein d is an average distance between the adjoining tracks measured in the direction perpendicular to the extending direction of the tracks, and an acceleration of the information recording medium in the perpendicular direction is 0.25 m/s 2 or less.

What is claimed is:  
     
         1 . An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, with an amplitude attenuation time of 1 second or less when vibrated in the direction perpendicular to the flat surface of said information recording medium.  
     
     
         2 . An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, with a vibration frequency attenuation time of 3 seconds or less when vibrated in the direction perpendicular to the flat surface of said information recording medium.  
     
     
         3 . An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, with an amplitude attenuation time of 1 second or less and a vibration frequency attenuation time of 3 seconds or less, when vibrated in the direction perpendicular to the flat surface of said information recording medium.  
     
     
         4 . The information recording medium as claimed in  claim 1 , wherein said amplitude attenuation time is in a range of 200 milliseconds to 1 second.  
     
     
         5 . The information recording medium as claimed in  claim 2 , wherein said vibration frequency attenuation time is in a range of 150 milliseconds to 3 seconds.  
     
     
         6 . The information recording medium as claimed in  claim 3 , wherein said amplitude attenuation time is in a range of 200 milliseconds to 1 second.  
     
     
         7 . The information recording medium as claimed in  claim 3 , wherein said vibration frequency attenuation time is in a range of 150 milliseconds to 3 seconds.  
     
     
         8 . The information recording medium as claimed in  claim 3 , wherein said amplitude attenuation time is in a range of 200 milliseconds to 1 second and said vibration frequency attenuation time is in a range of 150 milliseconds to 3 seconds.  
     
     
         9 . The information recording medium as claimed in  claim 1 , wherein said transparent substrate is in the shape of a disk, comprising: 
 a central hole portion,    an inner ring-shaped portion around said central hole portion, and    an outer ring-shaped portion comprising said recording layer or said metallic layer around said inner ring-shaped portion, said inner ring-shaped portion having a light transparency of 92% or less with respect to a recording or reproduction light for said information recording medium.    
     
     
         10 . The information recording medium as claimed in  claim 1 , further comprising a vibration prevention layer which is overlaid on the surface of said information recording medium on the side of said recording layer for preventing the vibrations of said information recording medium.  
     
     
         11 . The information recording medium as claimed in  claim 2 , further comprising a vibration prevention layer which is overlaid on the surface of said information recording medium on the side of said recording layer for preventing the vibrations of said information recording medium.  
     
     
         12 . The information recording medium as claimed in  claim 3 , further comprising a vibration prevention layer which is overlaid on the surface of said information recording medium on the side of said recording layer for preventing the vibrations of said information recording medium.  
     
     
         13 . The information recording medium as claimed in  claim 10 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         14 . The information recording medium as claimed in  claim 11 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         15 . The information recording medium as claimed in  claim 12 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         16 . The information recording medium as claimed in  claim 13 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         17 . The information recording medium as claimed in  claim 14 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         18 . The information recording medium as claimed in  claim 15 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         19 . The information recording medium as claimed in  claim 10 , wherein said vibration prevention layer comprises an ink component.  
     
     
         20 . The information recording medium as claimed in  claim 11 , wherein said vibration prevention layer comprises an ink component.  
     
     
         21 . The information recording medium as claimed in  claim 12 , wherein said vibration prevention layer comprises an ink component.  
     
     
         22 . The information recording medium as claimed in  claim 10 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         23 . The information recording medium as claimed in  claim 22 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         24 . The information recording medium as claimed in  claim 11 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         25 . The information recording medium as claimed in  claim 24 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         26 . The information recording medium as claimed in  claim 12 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         27 . The information recording medium as claimed in  claim 26 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         28 . The information recording medium as claimed in  claim 9 , further comprising a vibration prevention layer which is overlaid on said inner ring-shaped portion, and said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         29 . The information recording medium as claimed in  claim 28 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         30 . The information recording medium as claimed in  claim 29 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         31 . The information recording medium as claimed in  claim 28 , wherein said vibration prevention layer comprises an ink component.  
     
     
         32 . The information recording medium as claimed in  claim 28 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         33 . The information recording medium as claimed in  claim 32 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         34 . The information recording medium as claimed in  claim 9 , further comprising a vibration prevention layer which is overlaid on said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         35 . The information recording medium as claimed in  claim 34 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         36 . The information recording medium as claimed in  claim 35 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         37 . The information recording medium as claimed in  claim 34 , wherein said vibration prevention layer comprises an ink component.  
     
     
         38 . The information recording medium as claimed in  claim 34 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         39 . The information recording medium as claimed in  claim 38 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         40 . The information recording medium as claimed in  claim 10 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         41 . The information recording medium as claimed in  claim 11 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         42 . The information recording medium as claimed in  claim 12 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         43 . The information recording medium as claimed in  claim 25 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         44 . The information recording medium as claimed in  claim 34 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         45 . The information recording medium as claimed in  claim 1 , wherein said transparent substrate is produced by injection molding with a cooling time of 5 seconds or more.  
     
     
         46 . The information recording medium as claimed in  claim 2 , wherein said transparent substrate is produced by injection molding with a cooling time of 5 seconds or more.  
     
     
         47 . The information recording medium as claimed in  claim 3 , wherein said transparent substrate is produced by injection molding with a cooling time of 5 seconds or more.  
     
     
         48 . The information recording medium as claimed in  claim 2 , wherein said transparent substrate is in the shape of a disk, comprising: 
 a central hole portion,    an inner ring-shaped portion around said central hole portion, and    an outer ring-shaped portion comprising said recording layer or said metallic layer around said inner ring-shaped portion, said inner ring-shaped portion having a light transparency of 92% or less with respect to a recording or reproduction light for said information recording medium.    
     
     
         49 . The information recording medium as claimed in  claim 48 , further comprising a vibration prevention layer which is overlaid on both said inner ring-shaped portion and said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         50 . The information recording medium as claimed in  claim 49 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         51 . The information recording medium as claimed in  claim 50 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         52 . The information recording medium as claimed in  claim 49 , wherein said vibration prevention layer comprises an ink component.  
     
     
         53 . The information recording medium as claimed in  claim 49 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         54 . The information recording medium as claimed in  claim 53 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         55 . The information recording medium as claimed in  claim 48 , further comprising a vibration prevention layer which is overlaid on said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         56 . The information recording medium as claimed in  claim 55 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         57 . The information recording medium as claimed in  claim 56 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         58 . The information recording medium as claimed in  claim 55 , wherein said vibration prevention layer comprises an ink component.  
     
     
         59 . The information recording medium as claimed in  claim 55 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         60 . The information recording medium as claimed in  claim 59 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         61 . The information recording medium as claimed in  claim 49 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         62 . The information recording medium as claimed in  claim 55 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         63 . The information recording medium as claimed in  claim 3 , wherein said transparent substrate is in the shape of a disk, comprising: 
 a central hole portion,    an inner ring-shaped portion around said central hole portion, and    an outer ring-shaped portion comprising said recording layer or said metallic layer around said inner ring-shaped portion, said inner ring-shaped portion having a light transparency of 92% or less with respect to a recording or reproduction light for said information recording medium.    
     
     
         64 . The information recording medium as claimed in  claim 63 , further comprising a vibration prevention layer which is overlaid on both said inner ring-shaped portion and said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         65 . The information recording medium as claimed in  claim 64 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         66 . The information recording medium as claimed in  claim 65 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         67 . The information recording medium as claimed in  claim 64 , wherein said vibration prevention layer comprises an ink component.  
     
     
         68 . The information recording medium as claimed in  claim 64 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         69 . The information recording medium as claimed in  claim 68 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         70 . The information recording medium as claimed in  claim 63 , further comprising a vibration prevention layer which is overlaid on said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         71 . The information recording medium as claimed in  claim 70 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         72 . The information recording medium as claimed in  claim 71 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         73 . The information recording medium as claimed in  claim 70 , wherein said vibration prevention layer comprises an ink component.  
     
     
         74 . The information recording medium as claimed in  claim 70 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         75 . The information recording medium as claimed in  claim 74 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         76 . The information recording medium as claimed in  claim 64 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         77 . The information recording medium as claimed in  claim 70 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         78 . An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, including information recording, reproducing and/or deleting tracks along which tracks information can be recorded, reproduced and/or deleted by an information recording, reproducing and/or deleting device, wherein when said information recording medium is in-plane vibrated in the direction perpendicular to the extending direction of said tracks, a maximum in-plane deviation of a recording, reproducing or deleting position in said tracks in said perpendicular direction from a correct recording, reproducing or deleting position in said tracks is 12.5×d or less wherein d is an average distance between the adjoining-tracks measured in the direction perpendicular to the extending direction of said tracks, and an acceleration of said information recording medium in said perpendicular direction is 0.25 m/s 2  or less.  
     
     
         79 . An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, including information recording, reproducing and/or deleting tracks along which tracks information can be recorded, reproduced and/or deleted by an information recording, reproducing and/or deleting device, wherein an in-plane deviation of a recording, reproducing or deleting position in said tracks from a correct recording, reproducing or deleting position in said tracks is monitored by a tracing device for tracing said recording, reproducing or deleting position, a correct recording, reproducing or deleting position is virtually determined by said monitored in-plane deviation, and a maximum in-plane deviation is controlled to be 12.5×d or less wherein d is an average distance between the adjoining tracks measured in the direction perpendicular to the extending direction of said tracks, and an acceleration of said information recording medium in said perpendicular direction is also controlled to be 0.25 m/s 2  or less.  
     
     
         80 . The information recording medium as claimed in  claim 78 , wherein said transparent substrate is in the shape of a disk, comprising: 
 a central hole portion,    an inner ring-shaped portion around said central hole portion, and    an outer ring-shaped portion comprising said recording layer or said metallic layer around said inner ring-shaped portion, said inner ring-shaped portion having a light transparency of 92% or less with respect to a recording or reproduction light for said information recording medium.    
     
     
         81 . The information recording medium as claimed in  claim 78 , further comprising a vibration prevention layer which is overlaid on the surface of said information recording medium on the side of said recording layer for preventing the vibrations of said information recording medium.  
     
     
         82 . The information recording medium as claimed in  claim 81 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         83 . The information recording medium as claimed in  claim 82 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         84 . The information recording medium as claimed in  claim 81 , wherein said vibration prevention layer comprises an ink component.  
     
     
         85 . The information recording medium as claimed in  claim 81 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         86 . The information recording medium as claimed in  claim 85 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         87 . The information recording medium as claimed in  claim 81 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         88 . The information recording medium as claimed in  claim 78 , wherein said transparent substrate is produced by injection molding with a cooling time of 5 seconds or more.  
     
     
         89 . The information recording medium as claimed in  claim 81 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g /cm 2  or less and curing the coated UV curing material a plurality of times.  
     
     
         90 . The information recording medium as claimed in  claim 80 , further comprising a vibration prevention layer which is overlaid on both said inner ring-shaped portion and said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         91 . The information recording medium as claimed in  claim 90 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         92 . The information recording medium as claimed in  claim 91 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         93 . The information recording medium as claimed in  claim 90 , wherein said vibration prevention layer comprises an ink component.  
     
     
         94 . The information recording medium as claimed in  claim 90 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         95 . The information recording medium as claimed in  claim 94 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         96 . The information recording medium as claimed in  claim 90 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2  .  
     
     
         97 . The information recording medium as claimed in  claim 90 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g/cm 2  or less and curing the coated UV curing material a plurality of times.  
     
     
         98 . The information recording medium as claimed in  claim 80 , further comprising a vibration prevention layer which is overlaid on said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         99 . The information recording medium as claimed in  claim 98 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         100 . The information recording medium as claimed in  claim 99 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         101 . The information recording medium as claimed in  claim 98 , wherein said vibration prevention layer comprises an ink component.  
     
     
         102 . The information recording medium as claimed in  claim 98 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         103 . The information recording medium as claimed in  claim 102 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         104 . The information recording medium as claimed in  claim 98 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         105 . The information recording medium as claimed in  claim 98 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g/cm 2  or less and curing the coated UV curing material a plurality of times.  
     
     
         106 . The information recording medium as claimed in  claim 79 , wherein said transparent substrate is in the shape of a disk, comprising: 
 a central hole portion,    an inner ring-shaped portion around said central hole portion, and    an outer ring-shaped portion comprising said recording layer or said metallic layer around said inner ring-shaped portion, said inner ring-shaped portion having a light transparency of 92% or less with respect to a recording or reproduction light for said information recording medium.    
     
     
         107 . The information recording medium as claimed in  claim 79 , further comprising a vibration prevention layer which is overlaid on the surface of said information recording medium on the side of said recording layer for preventing the vibrations of said information recording medium.  
     
     
         108 . The information recording medium as claimed in  claim 107 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         109 . The information recording medium as claimed in  claim 108 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         110 . The information recording medium as claimed in  claim 107 , wherein said vibration prevention layer comprises an ink component.  
     
     
         111 . The information recording medium as claimed in  claim 107 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         112 . The information recording medium as claimed in  claim 111 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         113 . The information recording medium as claimed in  claim 107 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         114 . The information recording medium as claimed in  claim 79 , wherein said transparent substrate is produced by injection molding with a cooling time of 5 seconds or more.  
     
     
         115 . The information recording medium as claimed in  claim 107 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g/cm 2  or less and curing the coated UV curing material a plurality of times.  
     
     
         116 . The information recording medium as claimed in  claim 106 , further comprising a vibration prevention layer which is overlaid on both said inner ring-shaped portion and said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         117 . The information recording medium as claimed in  claim 116 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         118 . The information recording medium as claimed in  claim 117 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         119 . The information recording medium as claimed in  claim 116 , wherein said vibration prevention layer comprises an ink component.  
     
     
         120 . The information recording medium as claimed in  claim 116 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         121 . The information recording medium as claimed in  claim 120 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         122 . The information recording medium as claimed in  claim 116 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         123 . The information recording medium as claimed in  claim 116 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g/cm 2  or less and curing the coated UV curing material a plurality of times.  
     
     
         124 . The information recording medium as claimed in  claim 106 , further comprising a vibration prevention layer which is overlaid on said outer ring-shaped portion for preventing the vibrations of said information recording medium.  
     
     
         125 . The information recording medium as claimed in  claim 124 , wherein said vibration prevention layer comprises a hydrophilic material.  
     
     
         126 . The information recording medium as claimed in  claim 125 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         127 . The information recording medium as claimed in  claim 124 , wherein said vibration prevention layer comprises an ink component.  
     
     
         128 . The information recording medium as claimed in  claim 124 , wherein said vibration prevention layer comprises (a) a UV cured ink layer comprising an ink component and (b) a hydrophilic-material layer comprising a hydrophilic material, which are overlaid.  
     
     
         129 . The information recording medium as claimed in  claim 128 , wherein said hydrophilic material is selected from the group consisting of polyvinyl pyrrolidone and polyvinyl alcohol.  
     
     
         130 . The information recording medium as claimed in  claim 124 , wherein said vibration prevention layer is overlaid in a deposition amount of 0.002 g/cm 2  to 0.040 g/cm 2 .  
     
     
         131 . The information recording medium as claimed in  claim 124 , wherein said vibration prevention layer is formed by repeating the step of coating a UV curing material in an amount of 0.004 g/cm 2  or less and curing the coated UV curing material a plurality of times.