Patent ID: 6618345
Filing Date: 2003-09-09
Classification: G11B

Abstract:
An optical recording/reproducing system, comprising:a recording medium including a plurality of recording tracks having a minimized track pitch, wherein the track pitch between the recording tracks is substantially equal to a distance from a center of a beam spot on a light-applied plane of the medium to a location of an initial threshold minimum intensity in a radial direction of the beam spot, wherein an intensity of the beam spot at a track being irradiated by the center of the beam spot is sufficient to record and/or reproduce information to said track when the medium is irradiated, and wherein the intensity of the beam spot at an adjacent track being irradiated by said initial threshold minimum intensity is insufficient to allow recording and/or reproduction of information to said adjacent track when the medium is irradiated; and an objective lens which focuses a beam incident on said lens to said light-applied plane as said beam spot, wherein a ratio of an effective radius of said objective lens in the alignment direction of said recording tracks to an effective radius of said beam incident on said objective lens in the alignment direction of said recording tracks is less than 1.0.