Optical disk

Details Optical disk Optical disk

1996-10-29

1998-10-06

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 645, 428 646, 428 647, 428 648, 428913, 43027013, 43027014, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

058173897

ABSTRACT:
It is an object of the present invention to increase an amount of information recorded on an optical disk having at least two information recording layers. An optical disk having a plurality of information recording layers according to the present invention includes a transparent substrate, a transparent layer and at least two information recording layers formed on the transparent substrate. The information recording layers are provided so as to sandwich the transparent layer. At least one of the information recording layers has a transmittance varying layer. The transmittance varying layer is made of a material whose transmittance is changed at a predetermined temperature as a threshold value. The transmittance varying layer is made of a phase change material. The threshold value is within the temperature range from 700.degree. to 500.degree.. Crystallization speed of the transmittance varying layer is equal to or slower than 500 ns.

REFERENCES:
patent: 5569517 (1996-10-01), Tominaga et al.
patent: 5604002 (1997-02-01), Tsujioka et al.

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