Multi-layer optical disk

Details Multi-layer optical disk Multi-layer optical disk

1998-06-19

2000-02-29

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428702, 428913, 43027012, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

060306785

ABSTRACT:
In a multi-layer optical disk having a first information layer and a second information layer, reproduction of a more excellent quality is made possible. To this end, there is provided a structure wherein the first information layer and the second information layer are laminated to form a sheet of the optical disk. Then, the first information layer has a metal reflecting film with a reflection factor of more than 90% relative to a first reproduction light with a wavelength range of 770 nm.about.830 nm and the second information layer is so structured to have a semi-transparent reflection film wherein a ratio ns.sub.2
s.sub.1 between respective real number portions of a refractive index ns.sub.1 against the above mentioned first reproduction light and a refractive index ns.sub.2 relative to a second reproduction light with a wavelength range of 615 nm.about.655 nm is more than 1.05.

REFERENCES:
patent: 5761187 (1998-06-01), Kaneko et al.
patent: 5766717 (1998-06-01), Kaneko et al.
patent: 5817389 (1998-10-01), Ono

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