A Method of Tone Reproduction Based on Electrostatic Ink Jet Using Dielectric-ink

Abstract

This paper presents various considerations of electrostatically extracted ink jet application to the gray-scale image reproduction of natural pictures. Remarkable in electrostatic ink jet extraction is the liquid thread which uses dielectric-ink.
Reproduction of gray levels as a function of thread volume modulation is tried. There exists a smooth tone extending to the low density region under extremely low static ink pressure. Accordingly, the new nozzle mechanism is achieved by setting two nozzles to the same ink source with different ink pressures, together with the electrodes in pairs. It is found that application of the modified Laplacian operation to digitized input data could provide qualitative improvement of the reproduction, though its profounder improvements must be taken into account.