MANUFACTURING METHOD FOR MASTER OPTICAL DISK, MASTER OPTICAL DISK EXPOSING DEVICE, MASTER OPTICAL DISK AND MASTER OPTICAL DISK EXPOSING METHOD

摘要

PROBLEM TO BE SOLVED: To accurately expose a pit information format in a pit forming area when temporarily removing a master optical disk from a master optical disk exposing device after exposing a pit area and then mounting it again to expose pre-format information. SOLUTION: In this manufacturing method for the master optical disk, a glass substrate is formed having areas with different heights using a selectively exposed and processed photoresist layer as a mask. It has a process carrying out exposure and processing of the photoresist layer on the basis of the pre- format information to be ultimately formed on a master glass disk and a process forming an area with low height in accordance with a pit information forming area. By this, the pit information forming area can be accurately positioned on the master glass disk when exposing and processing the pit information forming area and forming the pit area with low height on the basis of a pre- format signal to be ultimately formed.