US 4,833,503 A · Electronic color printing system with sonic toner release development

Abstract

A multi-color printer using a sonic toner release development system to provide either partial or full color copies with minimal degradation of developed toner patterns by subsequent over-development with additional colors and minimal back contamination of developer materials. Multiple scanning beams, each modulated in accordance with distinct color image signals, are scanned across the printer's photoreceptor at relatively widely separated points, there being buffer means provided to control timing of the different color image signals to assure registration of the color images with one another. Each color image is developed prior to scanning of the photoreceptor by the next succeeding beam. After developing of the last color image, the composite color image is transferred to a copy sheet. Development is accomplished by vibrating the surface of a toner carrying member and thereby reducing the net force of adhesion of toner to the surface of the toner carrying member.

Claims2

Dependent claims

A non-interactive color developing apparatus that has minimal interaction effects between deposited toner and subsequently presented toner adapted to achieve multicolor single transfer of images without cross-color contamination of images and/or developer materials, comprising:

a plurality of toner carrying piezoelectric polymer belts for conveying toner from respective developer vessels to a location adjacent to an electrostatic latent image carrying member, said plurality of toner carrying piezoelectric polymer belts being positioned with predetermined spacing with respect to said latent image carrying member;
and
grounded A.C. biased rollers for vibrating the toner carrying surface of said toner carrying piezoelectric polymer belts adjacent an area of said electrostatic latent image carrying member that is to be developed, and wherein said A.C. biased rollers cause said piezoelectric polymer belts to vibrate only in said area adjacent said electrostatic latent image carrying member in order to loosen toner on the surface thereof, but not release the toner unless an image field is present to thereby enhance the electrostatically drawing of the toner over to the image carrying surface of said electrostatic latent image carrying member.

Dependencies are inferred from the claim text.

Electronic color printing system with sonic toner release development

Life of this patent

Electronic color printing system with sonic toner release development

Life of this patent

Abstract

Claims2