Optical disk and method of producing the same

A method of producing a stamper for molding an optical disk base, comprising:

• electroforming on a photoresist master having a transfer surface pattern an Ni layer having a transfer surface to which said transfer surface pattern i transferred;
• forming a heat insulating layer on said Ni layer;
• forming a metallic layer on a side of said heat insulating layer opposite to a side facing said Ni layer;
• and
• separating said photoresist master from said Ni layer.

A method of producing a stamper for molding an optical disk base, comprising:

• electroforming on a mother stamper having an inverted transfer surface pattern an Ni layer having a transfer surface to which said inverted transfer surface pattern is transferred;
• forming a heat insulating layer on said Ni layer;
• forming a metallic layer on a side of said heat insulating layer opposite to a side facing said Ni layer;
• and
• separating said mother stamper from said Ni layer.

A method of producing a stamper for molding an optical disk base, comprising:

• forming photoresist on a glass master;
• exposing said photoresist with a laser and then developing said photoresist to thereby form a transfer surface pattern of fine projections and recesses;
• metallizing a surface of said photoresist formed with said transfer surface pattern and then electroforming a master transfer metal layer;
• forming a master heat insulating layer on said master transfer metal layer;
• forming a master metal layer on said master heat insulating layer on a side of said master heat insulating layer opposite to a side facing said transfer surface pattern;
• and
• separating said glass master and then removing said photoresist.

A method of producing a stamper for molding an optical disk base, comprising:

• producing a master by forming photoresist on a glass mast r, exposing said photoresist with a laser and then developing said photoresist to thereby form transfer surface pattern of fine projections and recesses, metallizing a surface of said photoresist formed with said transfer surface pattern and then electroforming a master transfer metal layer, separating said glass master, and removing said photoresist;
• producing a mother by executing peeling and film forming with said surface of said master formed with said pattern and then electroforming a mother transfer metal electrode, said mother having an inverted transfer surface pattern to which sad transfer surface pattern is transferred;
• and
• producing a son stamper by executing peeling and film forming with said inverted transfer surface of said mother, sequentially forming a son transfer metal layer having a transfer surface to which said inverted transfer surface pattern is transferred, a son heat insulating layer, and a son metal layer formed on a side of said on heat insulating layer opposite to a side facing said transfer surface, and separating said mother.

A stamper for molding an optical disk base, comprising:

• a transfer surface for molding the optical disk base;
• a heat insulating material extending in parallel to, but not contacting, said transfer surface;
• a metallic layer provided on a side of said heat insulating material opposite to a side facing said transfer surface;
• and
• guide grooves sequentially varied in configuration from inner circumference toward an outer circumference.