G - Physics – 03 – G
Patent
G - Physics
03
G
314/32, 32/12.02
G03G 13/08 (2006.01) G03G 15/08 (2006.01)
Patent
CA 1058980
ABSTRACT OF THE DISCLOSURE Electrophotographic copying apparatus having a multiple development capability for more completely developing and, hence, improving the quality of images which contain extended solid areas. This multiple development capability is attained by designing the development station in such a manner that the latent electrostatic image to be developed and the developer mixture will move through the development station at a sub- stantially identical velocity as distinguished from conventional system in which the developer passes through the development station much faster than the image. By matching the velocities of the image and the developer, degradation of the developed, or partially developed, image by the rubbing or sweeping of the carrier beads across the image will be substantially eliminated, and, accordingly, multiple development becomes possible. The sub- stantial matching of velocities is preferably accomplished by significantly reducing the width of the gap between the latent image bearing medium and the development plate through which the developer falls. This increases the density of developer in the gap and the degree of developer agitation and, hence, causes it to fall much slower while still ensuring an adequate supply for effective development of all areas of the image. With a system designed in this way, copies having a quality equal or superior to those obtainable with conventional systems can be achieved with a single development step and at speeds com- parable to those available in todays high speed machines. When, however, the image to be developed contains large extended solid areas. any needed number of additional development cycles can be selectively carried out to better develop such images and. hence, provide superior quality copies.
225258
Moore Robert A.
Sullivan Daniel J.
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