Method for producing optical disc and optical disc produced by that method

Abstract

Provision is made for a method for manufacturing an optical disc with as lessened to the utmost and for the optical disc manufactured by that method. A first single layered disc and a second single layered disc, that is, two sheets of single layered disc are laminated to integrate them as a unit to manufacture the optical disc wherein a phase difference in the direction of rotation is given between the first single layered disc and the second single layered disc for lamination. In this connection, the first single layered disc and a second single layered disc are included in different manufacturing lot L. The phase difference θ in the direction of rotation is such the phase difference that the single layered disc selected from the manufacturing lot L having the first single layered disc and the single layered disc selected from the manufacturing lot L having the second single layered disc are laminated by shifting in a plurality of number of times within range of 0°˜360° to render the tilt minimum.

Dependencies are inferred from the claim text.