Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
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.
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Cate James M.
LTV Aerospace and Defense Company
Richardson Robert L.
Sadacca Stephen S.
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