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US 5,310,333 AGranted
Roll stamper for molding substrate used for optical recording medium
AssigneeCanon Kabushiki Kaisha
InventorsTetsuya Sato, Osamu Kanome, Masataka Yashima, Hiroyuki Sugata
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Abstract
A roll stamper has a roll substrate and a stamper fixed thereto and having a convexity and concavity preformat pattern. The stamper has an auxiliary layer, including a material different from that of the stamper and a back surface on which the convexity and concavity preformat pattern is formed. The roll substrate has a low-melting layer on its surface and the auxiliary layer is in contact with the low-melting layer so that the stamper is fixed to the roll substrate.
Claims10
A roll stamper, comprising:
- a roll substrate, and
- a stamper fixed to said roll substrate and having a front surface and a back surface, with a convexity and concavity preformat pattern on said front surface, wherein said stamper has an auxiliary layer adjacent to said back surface and comprised of a material different from that of said stamper, and
- said roll substrate has a low-melting metal layer adjacent to a front surface thereof,
- said auxiliary layer being fixed to said roll substrate by contact with said low-melting metal layer so that said stamper is fixed to said roll substrate, wherein
- said auxiliary layer has a mirror-surface opposite said back surface of said stamper at an area corresponding to a part of said stamper where said preformat pattern is formed on said front surface, and has a roughened-surface opposite said back surface at an area corresponding to a part of said stamper where no preformat pattern is provided on said front surface.
2 more elements
A roll stamper, comprising:
- a roll substrate;
- and
- a stamper fixed to said roll substrate and having a front surface and a back surface, with a convexity and concavity preformat pattern on said front surface, wherein said stamper has an auxiliary layer adjacent to said back surface comprised of a material different from that of said stamper, and
- said roll substrate has a low-melting metal layer adjacent to a front surface thereof,
- said auxiliary layer being fixed to said roll substrate by contact with said low-melting metal layer so that said stamper is fixed to said roll substrate, and a melting point of said low-melting metal layer is lower than a melting point of said stamper and a melting point of said auxiliary layer, wherein
- said auxiliary layer has a mirror-surface opposite said back surface of said stamper at an area corresponding to a part of said stamper where said preformat pattern is formed on said front surface, and has a roughened-surface opposite said back surface at an area corresponding to a part of said stamper where no preformat pattern is provided on said front surface.
3 more elements
Dependencies are inferred from the claim text.