Optical recording medium, memory apparatus, and recording/reproduction method
AssigneeFujitsu Limited
InventorShinya Hasegawa
Life of this patent
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Abstract
An optical recording medium having at least a recording film and a protection film disposed on a substrate is disclosed. The optical recording medium includes a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which a laser beam is incident, the recording tracks having tapered protruding portions, wherein the protruding portions are formed of an optical near field generation film.
Claims28
An optical recording medium having at least a recording film and a protection film disposed on a substrate, the optical recording medium comprising:
- a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which a laser beam is incident, the recording tracks having tapered protruding portions;
- wherein the protruding portions are formed of an optical near field generation film.
An apparatus for recording or reproducing signals, the apparatus comprising:
- an optical source for irradiating a light beam;
- an optical head for condensing the light beam onto an optical recording medium including a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which the light beam is incident, the recording tracks having tapered protruding portions;
- and
- a moving part for moving the optical head;
- wherein the signals are recorded on the optical recording medium or reproduced from the optical recording medium by an optical near field generated from the light beam condensed to a tip portion of the tapered protruding portions.
An apparatus for recording or reproducing signals, the apparatus comprising:
- an optical source for irradiating a light beam;
- an optical head for condensing the light beam onto an optical recording medium including a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which the light beam is incident, the recording tracks having tapered protruding portions;
- a moving part for moving the optical head;
- and
- a magnetic head for functioning as a magnetic field modulating magnetic recording head and a magnetic reproduction head;
- wherein the signals are recorded on the optical recording medium or reproduced from the optical recording medium by an optical near field generated from the light beam condensed to a tip portion of the tapered protruding portions.
A memory apparatus comprising:
- an optical source for irradiating a light beam;
- an optical head for condensing the light beam onto an optical recording medium including a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which the light beam is incident, the recording tracks having tapered protruding portions;
- a moving part for moving the optical head in a direction along the recording tracks;
- a detecting part for detecting reflected light from the optical recording medium;
- and
- a tracking control part for executing tracking control with the moving part according to push-pull signals obtained from the detecting part.
An apparatus for recording or reproducing signals, the apparatus comprising:
- an optical source for irradiating a light beam;
- an optical head for condensing the light beam onto an optical recording medium including a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which the light beam is incident, the recording tracks having tapered protruding portions;
- and
- a moving part for moving the optical head;
- wherein the signals are recorded on the optical recording medium or reproduced from the optical recording medium by an optical near field generated from the light beam condensed to a tip portion of the tapered protruding portions;
- and
- wherein the optical head includes apertures, having no more than half the size of the wavelength λ of the light beam, disposed along a predetermined direction.
A method of recording or reproducing signals comprising the steps of:
- irradiating a light beam from an optical source;
- condensing the light beam onto an optical recording medium including a plurality of recording tracks being disposed, along a predetermined direction, on a signal recording surface to which the light beam is incident, the recording tracks having tapered protruding portions;
- and
- recording or reproducing signals with an optical near field generated from the tapered protruding portions of the optical recording medium.
Dependencies are inferred from the claim text.