Optical recording medium and optical information playback method
AssigneeHitachi, Ltd.
InventorsTakao Watanabe, Manabu Shiozawa, Koichi Watanabe, Shigeharu Kimura
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Abstract
When a simple magnification optical system is used in reproduction of a recording medium in which a large number of minute modified regions are three-dimensionally formed inside solid matter, contrast is insufficient and interlayer crosstalk is increased, and therefore, it is impossible to take a sufficient S/N ratio. Provided is a recording medium in which at least one layer is configured by a set of two adjacent sub-layers, and dots on a sub-layer correspond to a recording data ‘1’ and dots on the other sub-layer correspond to ‘0’. These data are played back.
Claims13
An optical recording medium in which information is recorded therein in a three-dimensional formation of a plurality of dots and played back by radiating light therein,
- wherein one recording layer of the optical recording medium is formed of adjacent first and second sub-layers,
- wherein data ‘1’ is recorded by the dots of the first sub-layer,
- wherein data ‘0’ is recorded by the dots of the second sub-layer, and
- wherein one of the data ‘1’ is recorded in the first sub-layer or the data ‘0’ is recorded in the second sub-layer at each of a plurality of same positions with respect to a normal line of the optical recording medium.
A method of reproducing information from an optical recording medium, comprising:
- radiating light in the optical recording medium which has at least one recording layer in which a plurality of dots are three-dimensionally formed therein, and the one recording layer is formed of adjacent first and second sub-layers, where data ‘1’ is recorded by the dots of the first sub-layer, and data ‘0’ is recorded by the dots of the second sub-layer;
- and
- reproducing the information recorded in the recording layer from a signal which is obtained by irradiating the optical recording medium with the light,
- wherein one of the data ‘1’ is recorded in the first sub-layer or the data ‘0’ is recorded in the second sub-layer at each of a plurality of same positions with respect to a normal line of the optical recording medium.
Dependencies are inferred from the claim text.