OPTICAL RECORDING MEDIUM, PRODUCTION METHOD AND PRODUCTION DEVICE FOR OPTICAL RECORDING MEDIUM

摘要

An optical recording medium having a light transmitting layer formed with a uniform thickness on a substrate and being not likely to cause flash and delamination on the inner peripheral portion of the light transmitting layer, and a production method and a production device for the optical recording medium. An optical recording medium (10) is produced by a method comprising the step of forming a circular substrate (12) having an information recording surface (12A) on one surface thereof, the step of forming on the information recording surface (12A) a light transmitting layer (14) thinner than the substrate (12), the notching step of forming a circular notch (16) in the light transmitting layer (14), and the step of punching a region on the inner side of the notch (16) with a punching tool (18) to form a center hole (14A) and a center hole (20) in the light transmitting layer (14) and the substrate (12).