Abstract
Reciprocity failure data of electrophotographic photoreceptor are important characteristics in the design of practical Laser beam printer.
The Reciprocity law in four kinds of photoreceptors, that is α-Se layer, PVK-TNF layer, Copper-phthalocyanine binder layer and dyed-ZnO binder layer, have been measured by using Ar-Laser and He-Ne Laser. In constant total exposure, exposure time was changed in the range of 10-2 to 10-6 sec and light intersity was changed in the range of 103 to 107 erg/cm2. The Reciprocity law in each photoreceptor is held in exposure time range of 10-2 to 10-5 sec and not held in exposure time over 10-6 sec.
The amount of failure depends on the wavelength of light, which is related to spectral absorption of photoreceptors. Most largest decrease of electrostatic sensitivity in the case of α-Se at exposure time over 10-6 sec is about 10% of normal sensitivity. But the failure may be not observed in the image density formed by toner development, because the electrostatic contrast of latent images for the development is enoughly held in about 10% decrease of the electrostatic sensitivity by reciprocity failure.
