Patent ID: 7055162
Filing Date: 2006-05-30
Classification: G11B

Abstract:
1. A method for preparing an optical information medium including a disk-shaped supporting substrate having a center hole, an annular information recording area thereon, and an annular resin-based light-transmitting layer on the information recording area by which recording/reading laser beam is transmitted, said light-transmitting layer terminating at a radially inner periphery which forms an annular raised rim, comprising the steps of: mounting a substrate in the form of the supporting substrate having the information recording area thereon on a rotating table, closing the center hole with a plug means having a disk member, feeding a coating fluid containing a resin onto the disk member, and thereafter rotating the substrate together with the plug means to spread the coating fluid over the substrate to form the annular resin layer, removing the plug means from the substrate, the resin layer being built up at the radially inner periphery thereof to form the annular raised rim, and then curing the resin layer to form the light-transmitting layer.