Patent ID: 7177263

Claim:
A method of manufacturing a recording medium having pairs of groove tracks and land tracks provided side by side while being bent periodically, a plurality of land prepits previously formed on said land tracks and carrying information about said groove tracks, and a recording layer formed on at least said groove tracks and said land tracks, said method comprising the steps of: forming said groove tracks extending by irradiating a spot of a cutting light beam, which moves relatively to a recording master disk, on a photoresist layer formed on said recording master disk; and shifting said spot of said cutting light beam in a direction perpendicular to a direction in which said groove tracks extend, returning said shifted spot to a position where said groove tracks should extend, thereby forming said land prepits having sides defined by curved surfaces continuously extending from sides of said groove tracks, and making those sides of said groove tracks which face said sides of said land prepits having curved surfaces stricturing said groove tracks, wherein said sides of said land prepits have a radius of mean curvature smaller than a radius of mean curvature of sides of said groove tracks in non-present regions of said land prepits.