Electrophotographic color printer apparatus and method with impr

Details Electrophotographic color printer apparatus and method with impr Electrophotographic color printer apparatus and method with impr

1994-12-09

1996-02-20

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

347116, 347248, 355208, 355212, 355328, G03G 1501

Patent

active

054933854

ABSTRACT:
A multicolor non-impact printer is described that includes a photoconductive image receiver. The receiver is uniformly charged with an electrostatic charge. The receiver is then imagewise exposed by a first electronic exposure source to create a first electrostatic image. A toner of a first color is applied to the receiver to create a first toner image of the first color. The receiver is then exposed by a second electronic exposure source to create a second electrostatic image in the same general area as the first toner image. A toner of a second color is applied to the receiver to create a second toner image which, with the first toner image, forms a multicolor toner image. An encoder roller is associated with each exposure source and rotates with movement of said receiver and generates encoder position pulses. In response to the encoder position pulses, an address is generated for input to the look-up table. In response to this address, data is output from the look-up table for generating adjusted encoder position pulses for adjusting for nonuniformities in roller diameter and/or a variation in roller diameter from an ideal diameter.

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