Recording medium and information recording and reproducing apparatus therefor.

摘要

A recording medium (1) from which recorded information is reproduced by irradiating a read-out light (LB), including an information recording surface and a plurality of information pits (1n) 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 ( gamma ), each of the plurality of grating directions corresponding to the information to be recorded. <IMAGE>