ELECTROGRAPHIC PRINTER OR COPIER WITH A DEVICE TO COMPENSATE FOR THE WAVELENGTH-DEPENDENT LIGHT SENSITIVITY OF THE CHARGE IMAGE SUBSTRATE

摘要

An electrophotographic printer or copier with an illumination correcting device for the optical character generator (ZG) contains means, e.g. a filter (FT), to compensate for the wavelength-dependent light sensitivity of the charge image substrate (FL) by controlling the lighting energy of the lighting devices (LED) dependently upon the wavelength of the light emitted by them and the light sensitivity of the charge image substrate (FL). This prevents the formation of undesired colour differences in the form of stripes when colouring large areas.