Optical disk and optical disk apparatus
作者： Toshihiro K. K. Toshiba Sugaya , Yoshinori K. K. Toshiba Honguh
DOI:
关键词: Optical disc 、 Light beam 、 Cross section (physics) 、 Numerical aperture 、 Wavelength 、 Range (particle radiation) 、 Optics 、 Lens (optics) 、 Substrate (electronics) 、 Materials science
摘要: An optical disk comprises a substrate, and recording layer which is formed on the substrate information recorded at specific pitches in form of pit trains, wherein reproduced by projecting light beam via an object lens, when wavelength λμm numerical aperture lens NA, track pitch set range (0.72 to 0.8)×λ/NA/1.14 μm, each pits has trapezoid cross section whose upper width (0.3 0.5)×/NA/1.14 μm lower (0.2 0.32)×λ/NA/1.14 or inner wall angle 30° 70°.
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