Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1982-12-13
1985-04-02
Richardson, Robert L.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369283, 369284, 369286, G11B 700, G11B 582
Patent
active
045091625
ABSTRACT:
A process for making a radiation-reflecting record carrier, such as a video disc, is provided on which video and/or audio information is stored in an optically readable track in which first reflective areas alternate with second reflective areas, the two reflective areas having different effects on a reading beam in a playback machine so that the information recorded on the carrier may be recovered. The second reflective areas serve to direct the reading beam away from the path along which it is reflected by the first reflective areas. The process uses photographic techniques to form a master negative or positive, and to form record carrier replicas from the master.
In the disclosed embodiment of the method and apparatus of this invention, the second reflective areas of replica carrier are formed by raised crystalline deposits of a material such as silicon which are chemically deposited in a selected, optically generated pattern on the replica carrier.
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Quixote Corporation
Richardson Robert L.
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