| 摘要 |
An optical recording medium of a pitting recording type, to which recording marks are formed by irradiation with a violet laser beam having a wavelength lambda in the range of about 380 to about 450 nm, includes a substrate having a surface provided with guide grooves and lands, and a metal recording layer in which recording marks are formed by irradiation with a laser beam. The guide grooves and the lands meet conditions expressed by: <?in-line-formulae description="In-line Formulae" end="lead"?>lambda/18<=DG<=lambda/11 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.5<=WG/WL<=3.5 (2)<?in-line-formulae description="In-line Formulae" end="tail"?> Where lambdais the wavelength of the laser beam used for writing and reading, DG, is the depth of the grooves, WG is the width of the grooves, and WL is the width of lands formed on the substrate, and the wavelength lambda is in the range of 380 to 450 nm.
|
