Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
Patent
1981-07-31
1983-12-27
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making named article
346 11, 346 76R, 346 76L, 3461351, 346137, 430 5, 430313, 430315, 430318, 430321, 430323, 430325, 430326, 430329, 430330, 358342, 358345, 369285, G03C 500, G01D 1514, G11B 702, H04N 576
Patent
active
044231377
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 reflective areas alternate with non-reflective areas, the two areas having different effects on a reading beam in a playback machine so that the information recorded on the carrier may be recovered. The non-reflective areas are formed as apertures in the reflective areas and the underlying substrate is preferably translucent. The disclosed process uses photographic techniques to form a master negative or positive, and to form record carrier replicas from the master.
In one disclosed embodiment of the method and apparatus of this invention, a two-sided recording medium comprises two transparent substrates, each of which supports a perforated metallic, reflecting layer. The two substrates are held together by a layer of adhesive disposed between the two reflecting layers.
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Bowers Jr. Charles L.
Quixote Corporation
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