A recording original disc (18) for optical discs is manufactured by the following steps: a first step for forming a lower layer (12), an intermediate layer (14) and an upper layer (16) of photoresist on the surface of a substrate (10), a second step for exposing the upper layer (16) to light to form...http://www.google.com.au/patents/US6228562?utm_source=gb-gplus-sharePatent US6228562 - Method for manufacturing recording original disc for optical information recording media
