Magneto-optical Disk Formed by Contact Printing

A method of the formation of grooves and pre-formatted pits on a glass substrate for a magneto-optical disk by contact printing is described. Up to now, a laser cutting method, whereby grooves and pre-formatted pits are formed with a focussed Ar-laser, has been used, and it needs over thirty minutes to expose a disk. But by using a contact printing method, we succeeded in the exposure of a disk for fifteen seconds, thus a mass production of the glass substrate for the magnetooptical disk with high quality and high reliability was made possible.