Multilayer optical disk

Details Multilayer optical disk Multilayer optical disk

1998-05-28

1999-11-23

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 647, 428 652, 428457, 428913, 43027011, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

059896701

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 disk has a first substrate on which is formed a first information storage layer which is relatively highly reflective with respect to a light beam having a wavelength of 770-830 nm; and a second substrate on which is formed a second information layer which is relatively transparent with respect to a light beam having a first substrate on which is formed a wavelength of 770 mn to 830 nm but which is sufficiently reflective with respect to a light beam having a wavelength of 615-655 nm.

REFERENCES:
patent: 5244774 (1993-09-01), Usami et al.
patent: 5766717 (1998-06-01), Kaneko et al.

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