Patent Number: 6,169,722

Title: Phase change type optical recording medium having minute length recorded marks

Abstract: Formation of small record marks at high shape and dimensional precision is enabled in an optical recording medium of phase change type adapted for formation of small record marks. Thermal stability of such small record marks with high shape and dimensional precision is also improved to provide a highly reliable optical recording medium of phase change type. The optical recording medium of the invention has a recording layer of phase change type, and record marks with minimum length of up to 350 nm are formed in the recording layer. The recording layer contains Ag, In, Sb and Te as its main components. Also provided is an optical recording medium wherein the recording layer also contains Ge and/or N as its sub-component.

Inventors: Kikukawa; Takashi (Tokyo, JP), Utsunomiya; Hajime (Tokyo, JP)

Assignee: TDK Corporation

International Classification: G11B 7/0045 (20060101); G11B 7/243 (20060101); G11B 7/013 (20060101); G11B 7/00 (20060101); G11B 7/24 (20060101); G11B 007/24 ()

Expiration Date: 01/02/2018