Frasable optical read/write data storage disc

Details Frasable optical read/write data storage disc Frasable optical read/write data storage disc

1986-02-13

1987-01-06

Richardson, Robert L.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 430321, G11B 724, G11B 726

Patent

active

046352457

ABSTRACT:
A temperature sensitive data storage element is disclosed, suitable for application in an erasable optical read/write data storage system. The data storage element includes an optical tuning film and a film of thermochromic phase change material which will change from a first phase to a second phase at temperatures in excess of an upper temperature and back to the first phase at temperatures below a lower temperature. In one application, a thermally controlled support member may be employed to temporarily lower the temperature on the storage element to a point below the lower temperature, thereby initializing the element. In one embodiment, the storage element is a planar, suitably circular disk. In use, the storage element is adapted to be initialized by a modulated laser beam which may be focused on the storage element to temporarily heat particular portions of the element to a temperature in excess of the upper temperature, causing a phase change. A method of manufacturing such a storage disk is also taught wherein a reflective metal layer is disposed on a substrate member under a film of phase change material, with a layer of dielectric turning material interposed between the metal layer and the film of phase change material.

REFERENCES:
patent: 3723121 (1973-03-01), Hauser
patent: 3761942 (1973-09-01), Lorenz et al.
patent: 3789420 (1974-01-01), Claytor et al.
patent: 3789421 (1974-01-01), Chivian et al.
patent: 4125860 (1978-11-01), Ishii
patent: 4331966 (1982-05-01), Moe
patent: 4360908 (1982-11-01), Howe et al.
patent: 4380015 (1983-04-01), Ito et al.

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