Xerox Corporation

Frederick O Hayes, Iii

Paul Allen Hosier

Jagdish C Tandon

Martin Edward Banton

Robert Paul Herloski

Mark A Atwood

Douglas E Proctor

Charles J Urso, Iii

Donald J Gusmano

Kraig A Quinn

John C Juhasz

Whynn Victor Lovette

Kevin M McGlynn

Robert J Rossi

Paul A Hosier, Iii

A semi-conductor chip for a print head, including: a plurality of LEDs; a drive circuit for supplying electrical power to the plurality of LEDs; and a control system calibrated to supply, using the drive circuit, the electrical power at a first magnitude to every LED in the plurality of LEDs and configured to: receive a first external clock pulse less than a second external clock pulse used to calibrate the plurality of LEDs; change the first magnitude to at least one second magnitude proportional to the first external clock pulse; receive a third external clock pulse different from the first and second external clock pulses; and energize, using the drive circuit and in response to the third external clock pulse, the plurality of LEDs for a first internal strobe time at the at least one second magnitude calculated by the control system.

Apparatus, system, and method for compensating light emitting diodes

A sensor assembly for a printer arranged to displace printed material along a path, including a sensor housing and a platen assembly. The sensor housing includes top surfaces and resilient elements fixed to the top surfaces, and houses light emitting elements. The platen assembly includes transparent material and a platen housing with a plurality of steps, and is arranged to engage the sensor housing and displace in a first direction along the sensor housing toward an end of the sensor housing such that the transparent material is aligned with the light emitting elements in a direction orthogonal to the axis. As the platen assembly displaces in the first direction, the plurality of resilient elements is arranged to engage the plurality of steps to urge the piece of transparent material into contact with the sensor housing with progressively greater force such that the transparent material is sealed against the sensor housing.

Serviceable sensor assembly and method

A method of processing image data from a multi-chip array with a plurality of photosensitive chips aligned substantially in a transverse direction, including: generating, using a processor for at least one specially programmed computer, a &#x394;y or &#x394;x optical error value equal to a difference in process and transverse directions, respectively, between actual and apparent locations for a first photosensor, the apparent location due to optical error; and storing, in a memory element for the specially programmed computer, respective outputs from the photosensors in the array for first and second scan lines. The actual location is included in the first scan line. The processor retrieves, for use as at least part of useful image data for the first photosensor, the stored output of: the first photosensor for the second scan line for a &#x394;y optical error, or a second photosensor for the first line for a &#x394;x optical error.

Image data compensation for optical or spatial error in an array of photosensitive chips

Image sensor module architecture provides flexible mounting of illuminators in an imaging apparatus with flexible fasteners. The architecture involves one or more LED-based illuminators that may be mounted adjustably to provide high intensity and uniform profile luminescence. The supporting imaging and electronic circuit components are quickly assembled and disassembled from the image sensor module by using a flexible multi-function clip having multiple segments for holding multiple objects together.

Image sensor module architecture

The present invention is directed to a system and method for compensating for offset and gain drift in a fast scan direction during an image forming process. To achieve compensation, the present invention samples a plurality of permanently darkened pixels upon powering up image sensors and circuitry therefor and during a sub-scanning process of an image and feeds this information into an offset value generating circuit. The offset generating circuit continually adjusts a pixel offset voltage according to a difference between sequential samples of the permanently darkened pixel, thereby compensating for fast scan offset drift. The present invention also samples a plurality of active pixels during a scanning of a calibration strip. From this scan, a gain corrective value is calculated. The present invention then samples active pixels during a scanning of a platen background. In response to this sampling, the gain corrective value is continually adjusted according to a difference between sequential samples of the platen background, thereby compensating for fast scan gain drift. The present invention can also compensate and balance transfer functions for a plurality of communication channels in a multi-channel system by using the same target values and same reference signals for each channel.

Apparatus and method for correcting offset and gain drift present during

A linear image sensor and process having a two stage transfer circuit in which split clock transistor actuating pulses are used to cancel cell-to-cell variations and neutralize undesired couplings of the rising edge of the charges into the transistors.

Process for canceling cell-to-cell performance variations in a sensor

A linear image sensor array and process having a two stage transfer circuit where in order to reduce non-uniformities between the photosite cells of the array resulting from difference transistor thresholds, the bias charge is injected between the first and second transistors of the two stage transfer circuit, with the first transistor function as a metering gate for bias charge injection.

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Ontario, NY, United States of America

Frederick O Hayes, Iii