Optical disc

Details Optical disc Optical disc

1997-04-03

1998-04-21

Ryan, Patrick

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428 642, 428 644, 428 645, 428 646, 428457, 428913, 43027012, 43027013, 4304951, 430945, 3692751, 3692754, 369283, 369288, B32B 300

Patent

active

057416036

ABSTRACT:
An optical disc comprising transparent substrate, a phase-changing material layer disposed on the transparent substrate and made of a material which is phase-changeable by radiation of a light beam, a reflecting film layer disposed on the phase-changing material layer, and a cooling layer disposed between the phase-changing material layer and the reflecting layer, wherein the cooling layer has a heat conductivity ranging from 0.25 J/cmKs to 20.00 J/cmKs. The optical disc of the present invention has such a structure that a crystal phase portion of the phase-changing material layer shows a higher light absorptivity than that of the amorphous phase portion and exhibits a high carrier to noise ratio (C/N ratio) irrespective of a line speed upon rotational driving of the optical disc.

REFERENCES:
patent: 5341358 (1994-08-01), Kobayashi et al.

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