OPTICAL RECORDING/REPRODUCING MEIUM−USE SUBSTRATE,PRODUCTION METHOD FOR OPTICAL RECORDING/REPRODUCING MEDIUM PRODUCING STAMPER AND OPTICAL RECORDING/REPRODCING MEDIUM PRODUCING STAMPER

摘要

An optical recording/reproducing medium having grooves (2) formed along recording tracks and used for recording/reproducing when irradiated with light L with a specified wavelength &lgr;, wherein the track pitch p of a groove (2) is at least 200 nm and up to 350 nm, and a ratio wg/p between the width wg of a groove (2) and a track pitch p is at least 0.24 and up to 0.67.