Optical data recording medium and method for reproducing recorded data
First Claim
1. An optical data recording medium, in which irradiation of a light beam is used for recoding or reproducing data, comprising:
- a substrate; and
a reproducing layer, provided to face a light-incident surface of the substrate, the reproducing layer for reproduction of a signal from a mark having a mark length shorter than a resolution limit of an optical system of a reproducing apparatus for reproducing the optical data recording medium.
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Accused Products
Abstract
An optical data recording medium, in which irradiation of a light beam is used for recoding and/or reproducing data includes (i) a substrate having an a rise and/or a recess which are a light-incident surface, (ii) a reflective layer, provided on the light-incident surface of the substrate, for reflecting the light beam, (iii) a light absorption layer for converting, to heat, a light of the light beam to heat on the surface of the reflective layer, (iv) a reproducing layer, provided on the surface of the heat-light converting layer, having a transmittance that changes in accordance with a light intensity distribution of the light beam. The optical data recording medium is excellent in super-resolution property, and enables reproduction of a shorter mark length.
110 Citations
18 Claims
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1. An optical data recording medium, in which irradiation of a light beam is used for recoding or reproducing data, comprising:
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a substrate; and
a reproducing layer, provided to face a light-incident surface of the substrate, the reproducing layer for reproduction of a signal from a mark having a mark length shorter than a resolution limit of an optical system of a reproducing apparatus for reproducing the optical data recording medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical data recording medium, in which irradiation of a light beam is used for recoding and/or reproducing data, comprising:
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a substrate having a non-flat surface on which a rise and/or a recess for recording and/or reproduction is formed;
a reproducing layer, provided on the non-flat surface of the substrate, the reproducing layer having a changeable transmittance with respect to the light beam, the changeable transmittance being changeable in accordance with intensity distribution of the light beam irradiated on the reproducing layer; and
a reflective surface, provided between the substrate and the reproducing layer, for reflecting a light beam having passed through the reproducing layer, the reflective surface having a rise and/or a recess that corresponds to the rise and/or the recess of the substrate. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A reproducing method of an optical data recording medium in which irradiation of a light beam is used for reproducing data recorded in the optical recording medium,
said optical data recording medium, including: -
a substrate; and
a reproducing layer, provided to face a light-incident surface of the substrate, the reproducing layer for reproduction of a signal from a mark having a mark length shorter than a resolution limit of an optical system of a reproducing apparatus for the optical data recording medium, said reproducing method comprising the steps of;
irradiating the light beam from above the reproducing layer; and
reproducing the mark having a mark length shorter than resolution limit of the optical system of the reproducing apparatus.
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18. A reproducing method of an optical recording medium in which irradiation of a light beam is used for reproducing data recorded in the optical recording medium,
said optical recording medium including: -
a substrate having a non-flat surface on which a rise and/or a recess for recording and/or reproduction is formed;
a reproducing layer, provided on the non-flat surface of the substrate, the reproducing layer having a changeable transmittance with respect to the light beam, the changeable transmittance being changeable in accordance with intensity distribution of the light beam; and
a reflective surface, provided between the substrate and the reproducing layer, for reflecting a light beam having passed trough the reproducing layer, the reflective surface having a rise and/or a recess that corresponds to the rise and/or the recess of the substrate, said reproducing method comprising the step of;
reproducing recording data by irradiating a light beam the optical data recording medium from above the reproducing layer.
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Specification