초록 ▼

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

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 byEQU 0.7 a

대표청구항 ▼

[ What is claimed is:] [1.] An optical information recording medium from which information is reproduced by a light beam having a spot diameter a, comprising:first and second tracks comprising as a part thereof track guide grooves and lands, respectively, formed into recesses/projections, both said

[ What is claimed is:] [1.] An optical information recording medium from which information is reproduced by a light beam having a spot diameter a, comprising:first and second tracks comprising as a part thereof track guide grooves and lands, respectively, formed into recesses/projections, both said track guide grooves and said lands bearing information recorded thereon; andpre-pits indicating addresses of said track guide grooves and said lands, said pre-pits being formed on other portions not bearing information than said track guide grooves and said lands, respectively, of both said first and second tracks,wherein a width of said pre-pits is from 0.2 a to 0.5 a, and a pitch T of said track guide grooves is given byEQU 0.7 a