Patent ID: 7044726

Claim:
A mold component of a mold assembly that includes a first mold and a second mold which close to thereby define a cavity therebetween for molding a substrate for an optical recording medium, the mold component being mounted to a mounting portion of the first mold of the mold assembly, and comprising: a stamper having a molding surface configured to form micro asperities in a surface of the substrate for the optical recording medium; and a stamper holder configured to hold said stamper thereon, said stamper holder having a generally hollow cylindrical shape such that said stamper holder can be mounted to the mounting portion of the first mold, wherein said stamper has an insertion hole extending through a central portion thereof, the insertion hole having a diameter which is larger than an outer diameter of a cavity-side end of said stamper holder when said stamper is at a higher temperature than a normal temperature, and, the insertion hole diameter being smaller than the outer diameter of the cavity-side end of said stamper holder when said stamper is at a normal temperature and is not held on the stamper holder, said stamper being held on said stamper holder, with the cavity-side end of said stamper holder being grasped by a rim of the insertion hole which has the smaller diameter when the stamper is at the normal temperature, after having the cavity-side end of said stamper holder inserted therein when the stamper is at the higher temperature.