Multilayer optical disk

Details Multilayer optical disk Multilayer optical disk

1996-04-09

1998-06-16

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428913, 4304951, 430945, 369283, B32B 300

Patent

active

057667179

ABSTRACT:
A multilayer optical disk having an information storage layer which can as well as be reproduced by a general-purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing apparatus. The multilayer optical disk having a plurality of information storage layers according to the present invention includes a plurality of information storage layers, wherein one of the plural information storage layers has a reflection factor of 70% or higher with respect to a wavelength of 770 nm to 830 nm which is a first wavelength of reproducing light, and other information storage layers are reproduced with reproducing light having a second wavelength which is different from the first wavelength of reproducing light. Each of the other information storage layers has a reflection factor of 20% or higher with respect to the second wavelength of reproducing light. The second wavelength of reproducing light is 615 nm to 655 nm.

REFERENCES:
patent: 5244774 (1993-09-01), Usami et al.

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