Application of Phosphor Type Materials to Electrophotography

摘要

The report covers most of the work devoted to the measurement of the electrophotographic speed of the various phosphors. Their photoconductivity, and change in capacity and dissipation factor. Under various exposure conditions results have shown good correlation between the measurements relative to speed. The use of brass, oxidized brass, and stainless steel backing plates in preparation of the sensitive phosphor surfaces, have shown no measureable differences. Binders of polystyrene, ethyl cellulose and polymethyl methacrylate, have given approximately equal results. Film thickness difference measurements have shown thin films to be faster than thick films. Retentivities of the order of 72 hours have been obtained on both thin and thick films. Overcoats and undercoats of clear resin resulted in a loss in speed. Checks on the spectral purity of the light sources used have shown them to be satisfactory. An explanation has been found for the occasional negative images produced. (Author)