A method of selectively producing positive or negative photoelectrophoretic copies is described. A suspension of photosensitive particles sensitive to a first range of wavelengths is placed between two electrodes, one of which is transparent and the other of which has a surface sensitive to a second range of wavelengths. When a field is imposed across the suspension and an image is projected through the transparent electrode using radiation in only one of said first and second ranges, a positive or negative image is formed on a given electrode, depending on whether the electrode or the suspension is sensitive to the radiation used.
Method and apparatus for eliminating corona arcing between electrodes in an electrophoretic imaging system by introducing a member at the entrance and exit of the nip between adjacent electrodes during the application of an electric field for imaging of an electrophoretic suspension between the electrodes.
In photoelectrophoretic imaging, a novel multicolor line or cross line filter element and method for maintaining color balance wherein the filter grid comprises a plurality of yellow, cyan and magenta color segments or their complementary colors of controlled varying widths for limiting color interaction in the resulting integrated image.
