Patent ID: 7138165

Claim:
An intermediate for an optical recording medium that has a central mounting hole formed in a central portion thereof and at least one kind of functional layer formed on one side thereof, for use in at least one of information recording and information reproduction, the intermediate being produced beforehand for manufacturing the optical recording medium, the intermediate comprising a hollow cylindrical protruding portion protruding from one surface thereof on the same side as the one side of the optical recording medium, wherein the intermediate has a circular recess formed in a central portion of the other surface thereof on a side opposite to the one side of the optical recording medium and having a diameter equal to a diameter of the central mounting hole, and a temporary central hole formed to extend through a central portion of the circular recess and having a diameter smaller than the diameter of the circular recess, said hollow cylindrical protruding portion having an outer diameter smaller than the diameter of the central mounting hole and an inner diameter equal to or larger than the diameter of the temporary central hole, and having a central axis thereof substantially aligned with a center of the temporary central hole.