JP2006324002A5 - - Google Patents

Claims (12)

An optical recording medium including a groove information track on which information pits for carrying information data are to be formed and a land pre-pit track. The land pre-pit track has a plurality of land pre-pits formed in advance, and groove information Tracks and land pre-pit tracks are alternately formed, and the land pre-pits are coupled to the groove information track, and the track width of the groove information track is at least in each of the land pre-pit existing sections. In some sections, the groove is narrower than the track width in the section where the land prepit is not present, and the groove is perpendicular to the tangential direction of the groove information track in the section where the land prepit exists. The notch width of the information track is connected to the groove information track. Optical recording medium, characterized in that less than the width of the land pre-pits. The land pre-pit, an optical recording medium according to claim 1, characterized in that it is coupled to both of said two groove information tracks adjacent on both sides. The land pre-pit is coupled to any one of two groove information tracks adjacent to both sides, and is formed apart from the other groove information track. The optical recording medium according to 1. 4. The optical recording medium according to claim 3, wherein the land prepits are defined by a curved shape having a radius of curvature smaller than a radius of curvature in a non-existing section of the land prepits. The track width of the land prepit existing section is equal to the pit area formed on the track of the land prepit existing section and the pit area formed on the track of the land prepit nonexistent section. The optical recording medium according to claim 3, wherein the track width is narrower than the track width of the non-existing section of the land pre-pits. An optical system including a groove information track on which information pits for carrying information data are to be formed, and a land pre-pit track coupled to the groove information track, in which a plurality of land pre-pits are previously formed A manufacturing method of a recording medium,
Forming the groove information track having a track width narrower than the track width in the non-existing section of the land prepit in at least a part of each of the existing sections of the land prepit;
In the direction perpendicular to the tangential direction of the groove information track, the width of the land prepit coupled to the groove information track is larger than the notch width of the groove information track in the section where the land prepit exists. Forming the land prepits as described above. The step of forming the land pre-pits includes a step of biasing one or two spots of the cutting light beam on a mask sheet in a direction perpendicular to a direction in which the groove information track should be extended,
Restoring the spot after being biased. 8. The method according to claim 7, wherein a laser power of the cutting light beam is increased in a predetermined period in at least one of the step of deflecting the cutting light beam and the step of returning. 7. The method according to claim 6, wherein the land pre-pit is coupled to both of the two groove information tracks adjacent on both sides. The land pre-pit is coupled to any one of two groove information tracks adjacent to both sides, and is formed apart from the other groove information track. 6. The method according to 6. 7. The method according to claim 6, wherein the land pre-pits are defined by a curved shape having a radius of curvature smaller than a radius of curvature in a non-existing section of the land pre-pits. The track width of the land prepit existing section is equal to the pit area formed on the track of the land prepit existing section and the pit area formed on the track of the land prepit nonexistent section. The method according to claim 6, wherein the track width of the non-existing section of the land prepit is narrower.