Optical disk

Details Optical disk Optical disk

1992-09-28

1994-04-19

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Retrieving image made using radiation imagery

430 13, 430495, 430945, G11B 724

Patent

active

053044401

ABSTRACT:
An optical disk having a greatly improved recording density. The disk has a transparent substrate provided with phase pits. A layer of a phase changeable material is formed on the substrate. This phase changeable material is a chalcogen or chalcogenide such as Sb.sub.2 Se.sub.3 or Sb.sub.2 Te.sub.3. When reading light is directed onto the disk, a part of the layer of the phase changeable material is melted within the spot of the reading light beam, and the reflectivity changes and a phase pit is read through the melted part. After the reading, the melted portion recrystallizes.

REFERENCES:
patent: 4668549 (1987-05-01), Lippits et al.
patent: 4940618 (1990-07-01), Hamada et al.
patent: 5171618 (1992-12-01), Suzuki

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