Recording medium and information recording and reproducing apparatus therefor
AssigneePioneer Electronic Corporation
InventorSatoshi Sugiura
Life of this patent
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Abstract
A recording medium from which recorded information is reproduced by irradiating a read-out light, including an information recording surface and a plurality of information pits formed on the information recording surface. The information pits are formed by fine diffraction gratings having a grating constant (d) less than one half of the wavelength (.lambda.) of the read-out light. The fine diffraction gratings have a plurality of grating directions, each of the plurality of grating directions corresponding to the information to be recorded.
Claims3
A recording medium from which recorded information is reproduced by irradiating the recording medium with a read-out light, comprising:
- an information recording surface;
- and
- a plurality of information areas formed on said information recording surface, each of said information areas being formed as a fine diffraction grating having a grating constant (d) less than one half of the wavelength (.lambda.) of said read-out light, each of said fine diffraction gratings having one of a plurality of grating directions, each of said plurality of grating directions corresponding to predetermined information.
Dependencies are inferred from the claim text.