Optisches Informationsaufzeichnungsmedium, optisches Informationsaufzeichnungs-/-wiedergabegerät unter Verwendung dieses Mediums, und Originalplattenbelichtungsgerät zu seiner Herstellung

摘要

An optical information recording medium is provided which enables recording of information alternately in a land and a groove of a track, without requiring a track jumping operation. The medium has a plurality of tracks each including a land and a groove, and a mirror section which divides each track in the circumferential direction of the disk. The land and the groove are consecutively formed across the mirror section, so as to form the track. An optical information recording/reproducing apparatus using the medium and a master disk exposure apparatus for producing the medium are also disclosed.