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Summary:
It is well known that electrophotography is one of the important processes in graphic engineering. Already electrostatic electrophotography has been used for making master plates for both offset and letterpress. The Carlson Process has been used practically and also some developments of the electronic printing process have been used in many countries. There are various electrophotographic processes, for instance the Xerox process, Electrofax process, 3M process, Persistent Internal Polarization process and others. The Electrofax process, in which the electrophotosensitive layer is made of zinc oxide fine powder dispersed in dielectric resin, is one of the most useful for graphic engineering. This paper is a review of our recent work on some fundamental characteristics of Electrofax layers, and includes four parts as follows: 1) the characteristics of static electrification of zinc oxide dispersed in dielectric resin ; 2) photoconductive properties of dispersed zinc oxide 3) photoconductivity of zinc oxide under different ambient conditions and 4) photoconductive hysteresis of zinc oxide in a dielectric resin.