Patent ID: 6195317
Filing Date: 2001-02-27
Classification: G11B

Abstract:
An optical disk apparatus for recording data on a recording medium, the apparatus comprising:a disk-shaped recording medium including a recording surface on which pits or marks are sequentially formed to form tracks and the desired data is recorded by using said pits or said marks, wherein said tracks are densely formed such that inter-code interference is generated between adjacent tracks, and said pits or said marks are formed such that said inter-code interference is canceled, wherein pits or marks for tracking control are formed such that their arrangement changes in a radial direction in units of a plurality of tracks at a constant interval; anda servo circuit that positions an optical spot scan between a track formed on said recording surface from which data is reproduced and a track immediately before the track from which data is reproduced,wherein said pits or said marks are formed such that a constant relationship is maintained for positions where said pits or said marks are formed, between adjacent tracks,said pits or said marks are formed such that their edge positions change in a step-like manner by using as a unit the distance corresponding to a specified shift period shorter than the transitional response period of a reproduction signal for a pit or a mark, said transitional response period being determined by the transfer function of a reproduction optical system, andsaid pits or said marks are formed such that their edge positions change in a step-like manner according to said pits or said marks placed on predetermined one of inner or outer adjacent track and recording signal.