An optical disk for use in optical memory devices.

摘要

An optical disk (5) for use in optical memory devices comprises guide grooves (1) and pits (2) on one surface (51) thereof, wherein the depth of the guide grooves (1) is different from that of the pits (2). The distance from the bottom face of each of the guide grooves (1) to the other surface (52) of the optical disk opposite to the one surface (51) of the optical disk (5) on which the guide grooves (1) and pits (2) are disposed is the same as the distance from the bottom face of each of the pits (2) to the other surface (52) of the optical disk opposite to the one surface (51) of the optical disk (5) on which the guide grooves and pits are disposed. Also disclosed is a method for the production of optical memory master plates (88) that are used for the production of the above-mentioned optical disk (5).