Patent Catalogue

OPTICAL DISC HAVING A SPECIFIC TRACK PITCH

Pits on an optical disc are formed in a specific form in order to obtain a high recording density and lessen crosstalk between adjacent tracks.

  • The track pitch is set in the range of (0.72~0.8) xλ/NA/1.4μm.
    λ: wavelength of the light beam
    NA: numerical aperture of the object lens
  • The pit has a trapezoidal cross section whose upper width and lower width are respectively in the specific range.

[References]

  • DVD Specifications for Read-Only Disc: Part I,Index.1.2

[Offering Patent]

  • USP5,459,712

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