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| 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. |
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The track pitch is set in the range of (0.72 0.8)
x /NA/1.4 m.
: wavelength of the light beam
NA: numerical aperture of the object lens |
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The pit has a trapezoidal cross section whose upper width and lower width
are respectively in the specific range. |
[References] |
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DVD Specifications for Read-Only Disc: Part I,Index.1.2 |
[Offering Patent] |
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USP5,459,712 |
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