Method of producing information recording medium, production apparatus and information recording medium
AssigneeSony Corporation
InventorsNobuyuki Arakawa, Ken Minemura
Life of this patent
Estimating the term…
Abstract
A method of producing an information recording medium having enhanced planarity with high productivity, comprising steps of processing a surface of a disk substrate by satin-like finishing, heating and pressing the disk substrate through compression using a stamper having relief shapes so as to transfer the relief shapes to at least one satin-like finished surface of the disk substrate, forming a recording layer on the relief shape surface of the disk substrate, and forming a coating layer on the recording layer, and a production apparatus for the information recording medium, and an information recording medium produced by the method of producing.
Claims18
A method of producing an information recording medium comprising steps of:
- processing a surface of a disk substrate by satin-like finishing,
- heating and pressing said disk substrate through compression using a stamper having relief shapes so as to transfer said relief shapes to at least one satin-like finished surface of said disk substrate,
- forming a recording layer on said relief shape surface of said disk substrate, and
- forming a coating layer on said recording layer.
A method of producing an information recording medium comprising steps of:
- processing a surface of a disk substrate by satin-like finishing,
- heating and pressing said disk substrate through compression using a stamper having relief shapes so as to transfer said relief shapes to at least one satin-like finished surface of said disk substrate,
- forming a first optical recording layer on said relief shape surface of said disk substrate,
- processing a surface of a resin sheet by satin-like finishing,
- heating and pressing said resin sheet through compression using a stamper having relief shapes so as to transfer said relief shapes to at least one satin-like finished surface of said resin sheet,
- forming a second optical recording layer on said relief shape surface of said resin sheet,
- bonding said first optical recording layer and said second optical recording layer.
A production apparatus for forming a substrate having relief shapes on at least one surface thereof of an information recording medium comprising said substrate and a recording layer formed on said relief shape surface of said substrate,
- said production apparatus of an information recording medium comprising:
- a mold for a compression molding having on an inside surface of a cavity thereof a stamper having relief shapes corresponding to said relief shapes,
- a heating means for heating said mold, and
- a pressing means for pressing said mold,
- said mold being split into an upper, center, and lower parts and being attached to a press movable vertically by said pressing means,
- a means for correcting parallelism of said lower mold and said upper mold of said press at the time of pressing of said press and making a pressing force uniform between said lower mold and upper mold being provided.
An information recording medium comprising:
- a disk substrate having relief shapes on at least one surface thereof,
- a recording layer formed on the relief shape surface of the disk substrate, and
- a coating layer formed on the recording layer,
- said disk substrate being a disk substrate processed by a satin-like finishing of the surface thereof, then transferred with said relief shapes to the satin-like finished surface thereof by heating and pressing through compression molding using a stamper having relief shapes.
An information recording medium comprising a disk substrate having relief shapes on at least one surface thereof, a first optical recording layer formed on the relief shape surface of said disk substrate, a resin sheet having relief shapes on at least one surface thereof, a second optical recording layer formed on the relief shape surface of said disk substrate, said first optical recording layer and said second optical recording layer being bonded, and light being focused from said resin sheet side for the disk substrate to said first optical recording layer and said second optical recording layer to record or reproduce information, wherein
- said disk substrate being a disk substrate processed by a satin-like finishing of the surface thereof, then transferred with said relief shapes to the satin-like finished surface thereof by heating and pressing through compression molding using a stamper having relief shapes,
- said resin sheet being a resin sheet processed by a satin-like finishing of the surface thereof, then transferred with said relief shapes to the satin-like finished surface thereof by heating and pressing through compression molding using a stamper having relief shapes.
Dependencies are inferred from the claim text.