Patent ID: 6167021
Filing Date: 2000-12-26
Classification: G11B

Abstract:
An optical recording medium comprising:a light-transmitting substrate having spiral or concentric grooves formed in at least one major surface;a phase change recording film which is formed on the grooved surface of said substrate and reversibly changes phase upon irradiation of a light beam and thereby changes optical characteristics; anda reflecting layer formed on said phase change recording film,wherein said spiral or concentric grooves form, on at least one major surface of said substrate, lands and grooves as a rewrite region in which data is rewritten,a distance between an outer perimeter of said rewrite region and a center of the spiral or circle of said grooves is not more than 58.5 mm, anda distance between centers of a land and a groove adjacent to each other is 0.61 .mu.m to 0.62 .mu.m.