Patent ID: 6300041
Filing Date: 2001-10-09
Classification: G11B,Y10S

Abstract:
A manufacturing method for an optical recording medium including a process for forming a photo-sensitive layer on a master, a process for forming a latent image of a track by exposing said photo-sensitive layer to a light, a process for forming a pattern of the track on said master by developing said photo-sensitive layer, and a process for molding a substrate of an optical recording medium having a track of the same pattern, comprising the steps of:forming a latent image of two concentric spiral tracks simultaneously in a data recording area of said optical recording medium by an exposure spot at a predetermined pitch in the exposing process; andforming a latent image of a single spiral structured track in a reproduction-only area of said optical recording medium by an exposure spot at a narrower pitch than said predetermined pitch; said single spiral structured track partially overlapping with said concentric spiral tracks to form a boundary region on said optical recording medium.