Abstract
A TV camera tube equipped with a photoconductive thin-film target is, in a sense, a two-dimensional rewritable optical memory. To apply the target of a camera tube to memory devices, however, its storage time, that is, time constant, must be sufficiently long to store optical information. This is, in general, possible by optimizing the composition and structure of photoconductive targets.In this article, various kinds of photoconductive materials are reviewed in detail. To realize optical recording media, it is advantageous to combine a photoconductive film with another material. Various combinations of photoconductor and insulator, elastomer, thermoplastics, electro-optical single crystal, and ferroelectric ceramics are also discussed.
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