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Trade-Offs in On-Board Densitometry

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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.

Document Type: Research Article

Publication date: January 1, 2000

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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