Patent ID: 6208595
Filing Date: 2001-03-27
Classification: G11B

Abstract:
A magneto-optical recording medium comprising a substrate having grooves and lands formed along recording tracks and also formed thereon embossed pits indicating information by their convex-concave pattern and which is formatted to record a magneto-optical signal in the groove, wherein on the assumption that a direction in the plane of a recording layer and perpendicular to the recording track is an x-direction while a direction in the plane of the recording layer and along the recording track is a y-direction and that of phase differences between an x-directional polarized component and a y-directional polarized component of a return part of a reading light reflected back from the recording layer, a one caused by a birefringence at the substrate is .phi..sub.br while a one caused by the magneto-optic Kerr effect of the recording layer is .phi..sub.MO, the magneto-optical recording medium meets the following conditions (1) and (2):-20.degree.<.phi..sub.br <+10.degree. (1)-45.degree.<(.phi..sub.br +.phi..sub.MO)<+15.degree.. (2)