Information recording medium adapted for use in land groove recording

摘要

An information recording medium for land.groove recording (16), which comprises a substrate (1) provided with a land.groove, and a recording film (3) which is formed on said substrate (1) and capable of generating a phase-change from a crystal state to an amorphous state and vice versa, wherein a step height between the land and the groove on the front surface of said recording film (3) is confined to the range represented by the following formula (1), $where\; ds\; is\; a\; step\; height\; between\; the\; land\; and\; the\; groove\; on\; the\; front\; surface\; of\; said\; recording\; film\; (3),\; lambda\; is\; a\; wavelength\; of\; light\; beam\; to\; be\; employed\; in\; a\; reproduction,\; and\; n\; is\; a\; refractive\; index\; of\; said\; substrate\; (1).\mathop{\mathrm{image}}$