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Volume: 16 | Article ID: art00059_2
Trade-Offs in On-Board Densitometry
  DOI :  10.2352/ISSN.2169-4451.2000.16.1.art00059_2  Published OnlineJanuary 2000

Variability inherent in the electrophotographic (EP) process often mandates some kind of process control strategy to provide the required image consistency. Both photoconductor and toner generally exhibit substantial unit-to-unit variability and environmental sensitivity, plus variability over the rest-run duty cycle and long-term aging. Another challenge addressed by process control is maximizing toner yield (prints from a given quantity of toner) without compromising image quality. Many process control strategies rely on on-board densitometers to monitor the process and provide the basis for automatic process control adjustments. Laboratory bench-top densitometers are too big and expensive, and have more capability than needed for process control. The specialized on-board densitometer typically doesn't need the user interface, nor certain other features, and the cost of the on-board densitometer must be reasonable vis-a-vis the total print engine cost. However, in certain respects the on-board densitometer may have to meet higher performance standards than the laboratory instrument. This paper provides an overview of on-board densitometer performance requirements and technology trends, in dry electrophotographic applications.

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Allen J. Rushing, "Trade-Offs in On-Board Densitometryin Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP16),  2000,  pp 652 - 656,

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