| 摘要 |
In an optical recording medium of land/groove recording system, a sufficient tilt margin and a reduced cross talk are realized simultaneously with a sufficiently increased output. Provided is an optical recording medium having a light-transmitting substrate formed with grooves wherein the grooves and the region between adjacent grooves are used for the recording track, and a reading beam is irradiated through the light-transmitting substrate, wherein the relations:are satisfied when the reading beam has a wavelength of lambd, the light-transmitting substrate has a refractive index at the wavelength lambd of n, the reading optical system has a numerical aperture of NA, recording track pitch is PT, the groove has a depth of lambd/(x.n), and T is PT/(lambd/NA).
|
