Optical information recording medium capable of recording information on both track guide grooves and lands and optical information reproducing apparatus for optical information recording medium

摘要

An optical information recording medium from which information is reproduced by a light beam having a spot diameter a includes track guide grooves and lands formed into recesses/projections, and pre-pits indicating the addresses of the track guide grooves and the lands. The width of the pre-pits is 0.2 a (inclusive) to 0.5 a (exclusive), and a pitch T of the track guide grooves is given byPP0.7 a T/2 0. 8 a.