Optical recording medium

Details Optical recording medium Optical recording medium

1992-12-28

1994-08-02

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430495, 430945, 346 76L, 3461351, B32B 300

Patent

active

053344332

ABSTRACT:
The optical recording medium of the invention comprises a dielectric thin film 3, a recording thin film 4, and a reflective thin film 5 stacked on a surface of a substrate 2, the recording thin film 4 containing an inorganic compound which decomposes to release a gas upon heating. The medium can be used as a write-once type optical recording disk. The use of inorganic material to form the recording thin film provides improved light resistance and the dielectric thin film disposed between the substrate and the recording thin film prevents entry of water vapor and oxygen from the substrate side, ensuring long-term reliable storage both before and after recording. The use of a shape memory alloy to form the reflective thin film provides high recording sensitivity, allowing for recording with laser light at a low power of up to 8 mW, for example. Low power recording at 6 mW or less is possible particularly when a low-melting thin film is provided between the dielectric thin film and the recording thin film.

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