Master medium for magnetic transfer including metal disk with relief or recess pattern
AssigneeFuji Photo Film Co., Ltd.
InventorsMakoto Nagao, Seiichi Watanabe, Masakazu Nishikawa
Life of this patent
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Abstract
A master medium for use in magnetic transfer of information includes a metal disk which has a first relief or recess pattern representing the information. The metal disk is produced by exposing a photoresist film formed on a base disk with a laser or electron beam modulated with the information while rotating the base disk; developing the photoresist film so as to form an original disk having a second relief or recess pattern; depositing metal on the original disk so as to mold the metal disk on the original disk; and removing the metal disk from the original disk.
Claims60
A master medium for use in magnetic transfer of information, comprising a metal disk which has a first relief or recess pattern representing said information, where said metal disk is produced by exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk, developing the photoresist film so as to form an original disk having a second relief or recess pattern, depositing metal on said original disk so as to mold said metal disk on said original disk, and removing said metal disk from said original disk.
A master medium for use in magnetic transfer of information, comprising a metal disk which has a first relief or recess pattern representing said information, where said metal disk is produced by exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk, developing the photoresist film so as to form a first original disk having a second relief or recess pattern, depositing metal on said first original disk so as to mold on said first original disk a second original disk having a third relief or recess pattern, removing the second original disk from said first original disk, depositing metal on said second original disk so as to mold said metal disk on said second original disk, and removing the metal disk from said second original disk.
A master medium for use in magnetic transfer of information, comprising a metal disk which has a first relief or recess pattern representing said information, where said metal disk is produced by exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk, developing the photoresist film so as to form a first original disk having a second relief or recess pattern, depositing metal on said first original disk so as to mold on said first original disk a second original disk having a third relief or recess pattern, removing the second original disk from said first original disk, depositing metal on said second original disk so as to mold on said second original disk a third original disk having a fourth relief or recess pattern, removing the third original disk from said second original disk, depositing metal on said third original disk so as to mold said metal disk on said third original disk, and removing the metal disk from said third original disk.
A method of manufacturing a master medium for use in magnetic transfer of information, where said master medium comprises a metal disk which has a first relief or recess pattern representing said information, said method comprising:
- exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk;
- developing the photoresist film so as to form an original disk having a second relief or recess pattern;
- depositing metal on said original disk so as to mold said metal disk on said original disk;
- and
- removing said metal disk from said original disk,
- wherein said original disk is made of a material containing Ni as a main component, and
- wherein said first relief or recess pattern has a soft magnetic layer formed thereon.
A method of manufacturing a master medium for use in magnetic transfer of information, where said master medium comprises a metal disk which has a first relief or recess pattern representing said information, said method comprises:
- exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk;
- developing the photoresist film so as to form a first original disk having a second relief or recess pattern;
- depositing metal on said first original disk so as to mold on said first original disk a second original disk having a third relief or recess pattern;
- removing the second original disk from said first original disk;
- depositing metal on said second original disk so as to mold said metal disk on said second original disk;
- and
- removing the metal disk from said second original disk
- wherein said original disk is made of a material containing Ni as a main component and
- wherein said first relief or recess pattern has a soft magnetic layer formed thereon.
A method of manufacturing a master medium for use in magnetic transfer of information, where said master medium comprises a metal disk which has a first relief or recess pattern representing said information, said method comprising:
- exposing a photoresist film formed on a base disk with a laser or electron beam modulated with said information while rotating the base disk;
- developing the photoresist film so as to form a first original disk having a second relief or recess pattern;
- depositing metal on said first original disk so as to mold on said first original disk a second original disk having a third relief or recess pattern;
- removing the second original disk from said first original disk;
- depositing metal on said second original disk so as to mold on said second original disk a third original disk having a fourth relief or recess pattern;
- removing the third original disk from said second original disk;
- depositing metal on said third original disk so as to mold said metal disk on said third original disk;
- and
- removing the metal disk from said third original disk,
- wherein said original disk is made of a material containing Ni as a main component, and
- wherein said first relief or recess pattern has a soft magnetic layer formed thereon.
Dependencies are inferred from the claim text.