Optical data storage medium for write once recording

• Main Authors: MARTENS, HUBERT CECILE FRANCOIS, TIEKE, BENNO
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2003
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

A dual-stack optical data storage medium (10) for write-once recording using a focused radiation beam (9) entering through an entrance face (8) of the medium is described. The medium comprises at least one substrate (1, 7) with present on a side thereof a first recording stack (2) named L0, comprising a write-once type L0 recording layer (3) with an absorption KL0 and a second recording stack (5) named L1 comprising a write-once type L1 recording layer (6) with an absorption kL1. The first recording stack L0 has an optical reflection value RL0 and an optical transmission value TL0 and the second recording stack has an optical reflection value RL1. The first recording stack is present at a position closer to the entrance face (8) than the second recording stack. When the following conditions are fulfilled: 0.45 ≤ TL0 ≤ 0.75 and 0.40 ≤ RL1≤ 0.80 and kL0 < 0.3 and kL1 < 0.3 a dual stack write-once medium is achieved which can be played in a standard DVD-ROM player. Several stack designs are described fulfilling