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AssigneeSony Corporation
InventorsYoshihito Fukushima, Atsushi Takeuchi, Hiroyuki Takemoto, Kenichi Itoh, Mineo Moribe, Takehiko Numata
Estimating the term…
On the assumption that a phase difference caused by a birefringence at the substrate is φbr while a one caused by the magneto-optic Kerr effect of the recording layer is φMO, the magneto-optical recording medium formatted to record information in the groove meets the conditions: −20°<φbr<+10° and −45°<(φbr+φMO)<+15°, the magneto-optical recording medium formatted to record information on the land meets the conditions: −20°<φbr<+10° and −15°<(φbr+φMO)<+45°, and the magneto-optical recording medium formatted to record information at both the land and groove meets the conditions: −20°<φbr<+10° and −15°<(φbr+φMO)<+15°.
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 φbr while a one caused by the magneto-optic Kerr effect of the recording layer is φMO, the magneto-optical recording medium meets the following conditions (1) and (2):
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 on the land, 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 φbr while a one caused by the magneto-optic Kerr effect of the recording layer is φMO, the magneto-optical recording medium meets the following conditions (1) and (4):
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 on both the land and 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 φbr while a one caused by the magneto-optic Kerr effect of the recording layer is φMO, the magneto-optical recording medium meets the following conditions (1) and (5):
Dependencies are inferred from the claim text.