US 7,186,109 B2Granted

Stamper holder, mold component, and mold assembly

AssigneeTDK Corporation

InventorsAtsushi Koyama, Mikio Domon

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Abstract

A stamper holder capable molding of a substrate having a high-quality. The stamper holder is mounted in a mold of a mold assembly that molds a substrate for an information recording medium, together with a stamper having a molding surface for forming micro asperities in a surface of the substrate, in a state where the stamper is fitted in an insertion hole formed through a central portion of the stamper. The stamper holder is formed such that an outer periphery thereof is increased in diameter on a side toward the molding surface compared with a reverse side thereof to form a sloped surface, and part or all of an outer peripheral surface of the stamper holder opposed to an inner peripheral surface of the stamper defining the insertion hole has a shape complementary to the inner peripheral surface of the stamper.

Claims2

Dependent claims

A mold component for being mounted in a mold of a mold assembly that molds a substrate for an information recording medium, comprising:

a flat disk-shaped stamper having a molding surface for forming micro asperities in a surface of the substrate for the information recording medium and having an insertion hole extending through a central portion thereof;
an inner peripheral surface of the central portion that defines the insertion hole comprising a sloped surface which has a larger diameter on the molding surface side compared with a diameter on an opposite side;
and
a stamper holder configured such that an outer periphery of the stamper holder has a gradually increased diameter from an end of a reverse side toward an end of the molding surface to form a sloped surface and to fit in the insertion hole extending through the central portion of the stamper, thereby holding the stamper,
wherein an entire outer peripheral surface of the stamper holder, which is complementary to an inner peripheral surface of the stamper defining the insertion hole, has a sloped shape, and
wherein the stamper holder is configured such that an end face of the stamper holder on a cavity side is flush with the molding surface.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/806,179Filed 23 Mar 2004
Priority: JP 2003-08413426 Mar 2003
Published: US 2004/0191352 A130 Sep 2004
Granted: 6 Mar 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B29C 43/021
Of articles of definite length, i.e. discrete articles: characterised by the shape of the surface
B29C 43/36
Component parts, details or accessories; Auxiliary operations: moulds for making articles of definite length, i.e. discrete articles
B29C 45/2632
With mould wall parts provided with fine grooves or impressions, e.g. for record discs: stampers; Mountings thereof
B29C 33/30
Moulds or cores; Details thereof or accessories therefor: mounting, exchanging or centering