Patent ID: 6035152
Filing Date: 2000-03-07
Classification: G03G

Abstract:
In a printing machine having a moving imaging surface, a projecting system for modulating a beam and projecting an image onto the imaging surface, a developer for application of toner to the image projected onto the imaging surface for transfer of the image to a medium, a method of development control comprising the steps of:generating a setup calibration tone curve base on a preset representative halftone patches;marking a test pattern in an interdocument zone of the imaging surface, wherein the test pattern comprises a plurality of halftone patches;sensing the test pattern and measuring a relative reflection of each of said plurality of halftone patches in the interdocument zone of the imaging surface;entering said measured values into a matrix and correlating said matrix to a plurality of print quality actuators;generating a representative tone reproduction curve base on the matrix results, said generating step includes calculating a plurality of transformations of said matrix;producing a feedback signal by comparing the representative tone reproduction curve to said setup calibration tone curve; andadjusting independently each of said print quality actuators to adjust printing machine operation for print quality correction, said plurality of print quality actuators consisting of values for charge, exposure, donor roll bias, jumping AC voltage, and toner concentration.