Patent Document ID: 5559588
Application ID: 08527615
Patent Status: 1

Claim One:
1. A liquid reproduction machine for producing a stabilized liquid toner image having clean-background areas, the reproduction machine comprising: (a) a movable image bearing member having an image bearing surface; (b) latent image forming means mounted along a path of movement of said image bearing member for forming a latent image electrostatically on said image bearing surface, said latent image having image areas and background areas; (c) a development apparatus containing liquid toner developer material for developing said latent image, said liquid toner developer material including a carrier liquid having a relatively low conductivity within a range of 0.01 to 1.00 pmho/cm, and charged toner particles having a relatively high charge level per particle resulting an absolute zeta potential within a range of 150 to 400 mV dispersed within said carrier liquid; and (d) an image stabilization roller including a relatively low voltage bias having an absolute value within a range from 200 to 1500 volts, said relatively low voltage bias having a polarity selected to be of the same electrical sign as a polarity of the toner particle charge, so as to combine with low conductivity of the carrier liquid and high charge level per particle of the toner particles to achieve effective image stabilization and clean developed image background areas.