Xerox Corporation

Edward W Smith, Jr

Eric Michael Gross

Mark A Scheuer

Paul A Garsin

Eric Scott Hamby

Daniel W MacDonald

John Buranicz

Patricia Joanne Donaldson

Joseph W Ward

Prasad P Padmanabhan

Howard A Mizes

Robert Paul Herloski

Robert P Loce

Beilei Xu

Yao Rong Wang

Joseph C Sheflin

Jack Thomas Lestrange

Jess Robert Gentner

Timothy James Clark

James J Franzen

Processes are presented for creating electronic banding compensation profiles for raster output scanner (ROS) devices by printing and scanning a test pattern having a series of strips extending along a process direction and spaced from one another along a cross process (fast scan) direction, analyzing the scanned data to determine facet-specific banding errors corresponding to individual strips, and selectively adjusting banding correction profiles to counteract the banding errors.

Process for creating facet-specific electronic banding compensation profiles for raster output scanners

Raster Output Scanners and printing systems are presented along with methods for mitigating banding in printing systems, in which electronic banding compensation is employed using cross-process direction light source intensity banding correction profiles tailored to corresponding reflective facets of a rotating polygon.

Printing system, raster ouput scanner, and method with electronic banding compensation using facet-dependent smile correction

A method and apparatus saves on toner cost and improves productivity for running registration and color process controls in a printer by making dual use of patches for both functions. That is, the small patches normally used only for registration measurement are also used for xerographic process control measurements, thereby eliminating the need for large patches and obtaining registration information and color control information at the same time. The dual use of small patches to measures both registration and color process control is made possible by periodically establishing correlation between the density of large density patches and the smaller registration patches.

Dual registration and process control toned patches

An apparatus ( ) for measuring toner concentration in a developer contained in a developer housing ( ) includes a developer sample container ( ) that receives a portion of developer extracted from the developer housing ( ). A spectrophotometer ( ) measures spectrophotometric data for the portion of the developer in the developer sample container ( ). A processor ( ) estimates the toner concentration based on the measured spectrophotometric data and a pre-determined relationship ( ) between the spectrophotometric data and the toner concentration. A method ( ) for estimating the toner concentration in a developer comprising a toner and a carrier includes measuring ( ) a color characteristic of the developer, comparing ( ) the measured color characteristic with a pre-determined relationship between the color characteristic and the toner concentration, and estimating ( ) the toner concentration based on the comparing.

Apparatus and method for characterizing the toner concentration in a developer of a printing device

A process control method for color quality control maintains a preselected developed mass per unit area (DMA) of black solid area by adjusting the development field during run-time operation. In order to estimate the DMA of a solid black control patch, which is outside the sensing range of an infra-red densitometer (IRD), an estimation technique is employed which accounts for system changes due to adjustment of the development field. The estimation technique includes generating two or more test patches, using a patch generator, which have DMA readings within the sensing range of the IRD. The DMA readings and corresponding development voltages of the test patches are sensed and used to calculate a developability curve. The developability curve is projected into a region beyond the sensing range of the IRD. From the developability curve, the DMA of the solid black control patch is estimated and employed in a closed feedback loop to return the system to the preselected DMA by adjusting the development field. Development field control provides faster response to toner density changes than toner concentration control, and thus, results in better color quality control.

Method and apparatus for adaptive black solid area estimation in a xerographic apparatus

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. The toner concentration control system maintains toner concentration in a developer structure, which is connected to a dispenser containing toner. The toner concentration control system includes a toner mass estimator providing a toner mass estimate of the toner mass in the developer structure to be applied to the photoreceptor; a feed forward dispense unit receiving the toner mass estimate and transmitting a feed forward dispense command based on the toner mass estimate; a toner concentration target adjusted by toner age, toner break-in and temperature in the developer structure; a feed back dispense unit receiving the adjusted toner concentration target and transmitting a feedback dispense command; and a total dispense unit receiving the feed forward dispense command and the feedback dispense command, and outputting total dispense command to the dispenser, which dispenses the toner to the developer structure in accordance with the total dispense command.

Toner concentration control for an imaging system

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. More particularly, the present invention relates to a toner concentration control system for maintaining toner concentration in a developer structure, which is connected to a dispenser containing toner. The toner concentration control system comprises: a sensor, reading the toner concentration; means for determining a toner age correction of toner concentration read by the sensor based on toner age of the toner in the developer structure; means for adjusting a toner concentration target based on the correction; and means for generating a feedback dispense command based on the adjusted toner concentration target to dispense toner into the developer structure to maintain the toner concentration in the developer structure.

Feedback toner concentration control for an imaging system

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. More specifically, the present invention relates to a toner concentration control system for maintaining toner concentration in a developer structure, which is connected to a dispenser containing toner.

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. More particularly, the present invention relates to a toner concentration control system for maintaining toner concentration in a developer structure, which is connected to a dispenser containing toner.

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. More, specifically, the present invention relates to a toner concentration control system for maintaining toner concentration in a developer structure, which is connected to a dispenser containing toner. The toner concentration control system including: a toner mass estimator providing a toner mass estimate of the toner mass in the developer structure to be applied to the photoreceptor; a feed forward dispense unit receiving the toner mass estimate and transmitting a feed forward dispense command based on the toner mass estimate; a toner concentration target adjusted for toner age in the developer structure; a feed back dispense unit receiving the adjusted toner concentration target and transmitting a feedback dispense command; and a total dispense unit receiving the feed forward dispense command and the feedback dispense command, and outputting total dispense command to the dispenser, which dispenses the toner to the developer structure in accordance with the total dispense command.

Feed forward and feedback toner concentration control for an imaging

The present invention generally relates to an imaging system, and more specifically, a method and apparatus for accurately predicting toner usage and hence toner dispensing requirements in an imaging system. More specifically, the present invention relates to a toner concentration control system for maintaining toner concentration in a developer structure, which is connected to a dispenser containing toner. The toner concentration control system includes a toner mass estimator providing a toner mass estimate of the toner mass in the developer structure to be applied to the photoreceptor; a feed forward dispense unit receiving the toner mass estimate and transmitting a feed forward dispense command based on the toner mass estimate; a toner concentration target adjusted for toner break-in in the developer structure; a feed back dispense unit receiving the adjusted toner concentration target and transmitting a feedback dispense command; and a total dispense unit receiving the feed forward dispense command and the feedback dispense command, and outputting total dispense command to the dispenser, which dispenses the toner to the developer structure in accordance with the total dispense command.

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Rochester, NY, United States of America

Edward W Smith, Jr