Patent ID: 6249298
Filing Date: 2001-06-19
Classification: B41C,Y10S

Abstract:
An electrocoagulation printing apparatus comprising a printing head carrying a linear array of electrolytically inert electrodes electrically insulated from one another and in contact with an electrically conductive electrocoagulation printing ink, said array of electrodes being arranged into a plurality of groups each having a predetermined number of closely spaced electrodes; and a signal processing device for correcting ink film pixel density, said signal processing device includingan input for receiving a signal representative of an ink film pixel density value associated with each electrolytically inert electrode in one of said groups of electrolytically inert electrodes and with said electrocoagulation printing ink,a signal processing circuit for altering an ink film pixel density value associated with a selected electrode in said one group of electrodes at least partially in dependence of ink film pixel density values associated with other electrodes in said one group, thereby providing an altered ink film pixel density value and compensating for an impedance factor introduced by adjacent pixel density values, andan output coupled to the selected electrode for supplying thereto the altered ink film pixel density value.