Reduced crosstalk optical recording medium using an optically related track pitch

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 having a varying intensity distribution on a light-applied plane of the medium to a location of an initial 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 the initial minimum intensity in the radial direction 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 information is recorded and/or reproduced through the effect of said optical system, and
• wherein a ratio of an effective radius of said objective lens in the alignment direction of the recording tracks to an effective radius of said beam incident on the objective lens in the alignment direction of the recording tracks is less than 1.

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 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 information is recorded and/or reproduced through the effect of said optical system, and
• wherein a ratio of an effective radius of said objective lens in the alignment direction of the recording tracks to an effective radius of the objective lens in the alignment direction of the recording tracks is between 0.5 and 0.9.

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 radially disposed intensity threshold minimum point within the beam spot;
• and
• an objective lens which focuses a beam incident on said lens to said light-applied plane as said beam spot,
• wherein the beam spot includes at least two regions including,
• a first region located at a track being irradiated by the center of the beam spot, wherein an intensity of the beam spot in said first region is greater than a threshold intensity and sufficient to record and/or reproduce information to said track when the medium is irradiated, and
• a second region located at an adjacent track being irradiated by the radially disposed intensity threshold minimum point, wherein the intensity of the beam spot in said second region can vary between a value greater than zero and less than the threshold intensity, and wherein the intensity of the beam spot in said second region is insufficient to allow recording and/or reproduction of information to said adjacent track when the medium is irradiated, and
• wherein a ratio of an effective radius of said objective lens in the alignment direction of the recording tracks to an effective radius of said beam incident on the objective lens in the alignment direction of the recording tracks is less than 1.

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 radially disposed intensity threshold minimum point within the beam spot;
• and
• an objective lens which focuses a beam incident on said lens to said light-applied plane as said beam spot,
• wherein the beam spot includes at least two regions including, a first region located at a track being irradiated by the center of the beam spot, wherein an intensity of the beam spot in said first region is greater than a threshold intensity and sufficient to record and/or reproduce information to said track when the medium is irradiated, and
• a second region located at an adjacent track being irradiated by the radially disposed intensity threshold minimum point, wherein the intensity of the beam spot in said second region varies between zero and the threshold intensity, and wherein the intensity of the beam spot in said second region is insufficient to allow recording and/or reproduction of information to said adjacent track when the medium is irradiated, and wherein a ratio of an effective radius of said objective lens in the alignment direction of the recording tracks to an effective radius of said beam incident on the objective lens in the alignment direction of the recording tracks is less than 1.

An optical recording/reproducing system, comprising:

• a recording medium including a plurality of recording tracks wherein the track pitch between the recording tracks is approximately equal to a distance from a center of a varying intensity beam spot on a light-applied plane of the medium to a radially disposed intensity threshold minimum point within the varying intensity beam spot;
• and
• an objective lens which focuses a beam incident on said lens to said light-applied plane as said beam spot,
• wherein the varying intensity beam spot includes at least two regions including a first region located at a track being irradiated by the center of the varying intensity beam spot, wherein an intensity of the varying intensity beam spot in said first region is greater than a threshold intensity and sufficient to record and/or reproduce information to said track when the medium is irradiated, and
• a second region located at an adjacent track being irradiated by the radially disposed intensity threshold minimum point, wherein the intensity of the varying intensity beam spot on said second region can vary between a value greater than zero and less than the threshold intensity, and wherein the intensity of the varying intensity beam spot on said second region is insufficient to allow recording and/or reproduction of information to said adjacent track when the medium is irradiated, and
• wherein information is recorded and/or reproduced through the effect of an optical system, and
• wherein a ratio of an effective radius of said beam incident on said objective lens in the alignment direction of the recording tracks to an effective radius of the objective lens in the alignment direction of the recording tracks is less than 1.