EP0574025

• Main Authors: HANDA, TOKUHIKO, TOMINAGA, JUNJI, HARATANI, SUSUMU
• Format: Patent
• Language: English
• Published: 19.01.1994
• Edition: 5
• Subjects: COLOUR PRINTING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; LINING MACHINES; PERFORMING OPERATIONS; PHYSICS; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS

In an optical recording medium comprising a recording layer on a substrate, the recording layer contains a recording material which consists essentially of A, B, C, MI, and MII wherein A is Ag and/or Au, B is In, C is Te and/or Se, MI is Sb and/or Bi, and MII is at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mn, W and Mo, the atomic ratio of the respective elements being represented by the formula: [(AaBbC1-a-b)xMI1-x]1-yMIIy wherein 0.01 </= a < 0.50, 0.01 </= b < 0.50, 0.30 </= x </= 0.70, and 0.001 </= y </= 0.20. Information is recorded and erased by exposing the recording layer to a light beam for causing the recording layer to change its crystallographic state. The invention improves C/N and repetitive recording performance at a low linear velocity of the recording layer relative to the light beam and enables reproduction in accordance with the CD standard.