Roll stamper and apparatus for forming a substrate for information recording medium

An apparatus for continuously manufacturing an information recording medium substrate, which comprises:

• means for melting and extruding a resin to form a resin sheet;
• a roll stamper having a pattern corresponding to a pre-format formed in its surface;
• and
• a specular roll disposed so as to face said roll stamper;
• said roll stamper comprising:
• a stamper member having a pattern corresponding to a pre-format pattern for an information recording medium;
• fixation members fixed to both end portions of a reverse surface of said stamper so as to be integral with said stamper member;
• fit grooves capable of fittingly receiving said fixation members and formed in a circumferential surface of a specular roll base parallel to the axis of said specular roll base;
• said fixation members being fitted in said fit grooves, said stamper member being fixed along the circumferential surface of said specular roll base;
• and
• means for applying a tensile force to said stamper member including wedges capable of being inserted between said fixation members and wall portions of said fit grooves, and means for applying a pressing force to each wedge in a direction parallel to an axis of said roll stamper.