Optical disk and method for producing the same
AssigneePanasonic Corporation
InventorKazuo Inoue
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Abstract
An optical disk is constructed such that a thin film including a reflective layer is formed on a substrate, or on a thermoplastic resin layer on the substrate. A stamper having an asperity pattern corresponding to information signals is directly pressed against the thin film to transfer the asperity pattern on the thin film. Heat-pressing the stamper against the thin film makes it possible to further accurately transfer the asperity of the stamper to the reflective layer with less pressing force in the case where the reflective layer is formed on a thermoplastic resin layer.
Claims11
A method for producing optical disks constructed such that laser light is irradiated on a side of the disk opposite to a substrate in information reading, the method comprising:
- directly and firmly contacting a stamper having an asperity pattern thereon with a sheet member having a thin film on a surface of the sheet member facing the stamper, the thin film including at least a reflective metal layer, the stamper being fixedly supported in a cavity of a die assembly, and the sheet member being supported in the cavity of the die assembly;
- and
- forming a substrate on a side of the sheet member opposite the reflective metal layer and transferring the asperity pattern of the stamper to the reflective metal layer by injecting a molten resin into the cavity of the die assembly by injection molding after the directly and firmly contacting the stamper with the sheet member.
Dependencies are inferred from the claim text.