Photocopying – Projection printing and copying cameras – Methods
Patent
1988-12-13
1990-08-21
Prescott, A. C.
Photocopying
Projection printing and copying cameras
Methods
355203, 355208, 355245, 430 30, 118712, 118691, G03G 1500, G03G 1508
Patent
active
049510886
ABSTRACT:
A toner mass developed control system for use with electronic printers or copiers provides for the measurement of toned photoconductor reflectivity and bare photoconductor reflectivity. The standard control ratio is modified by characterizing the particular sensor unit in use and by taking into account the reflectance from both photoconductor and toner in the toned patch reflectivity measurement. These factors together with a modification for photoconductor reflectance degradation enable accurate control in high optical density development and with highly reflective color toners by altering the control ratio in accordance with these factors.
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Bonvallet John C.
Brewster Jimmie Ray
Champion James R.
Shouldice Kenneth S.
International Business Machines - Corporation
Prescott A. C.
Rohrer Charles E.
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