Updegraff
Shawn Updegraff, Fairport, NY US
Patent application number | Description | Published |
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20090310636 | LIGHT INTENSITY BOOST FOR SUBPIXEL ENHANCEMENT - Techniques are disclosed that enable fine features such as serifs and narrow strokes of texts to be produced by xerographic devices, for example. The fine features may be generated by subpixels which are produced when a pulse width used to image a pixel is shorter than a corresponding physical size of a laser beam spot used to write the image on a Xerographic photoreceptor. The laser driver may be modified to drive a light emitting element with a boost current profile that includes an overshoot above a steady state current at a rising edge. The overshoot results in a light intensity time profile that has an increased area for a subpixel. | 12-17-2009 |
Shawn P. Updegraff, Fairport, NY US
Patent application number | Description | Published |
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20090047032 | SYSTEM FOR MEASURING MARKING MATERIAL ON A SURFACE, SUCH AS IN COLOR XEROGRAPHY - A printing apparatus has a substantially shiny photoreceptor imaging surface, and a photosensor array disposed to receive specularly-reflected light from the imaging surface. A quantity of toner is placed on the imaging surface, and data is derived based on light reflected from the imaging surface. The reflected light is filtered to a color effectively complementary to the toner color. The system avoids noise caused by diffusely-reflected light from powdered toner. | 02-19-2009 |
20100014896 | USE OF XEROGRAPHIC IMAGES AND A FULL-WIDTH ARRAY SENSOR FOR MULTIPLE CONTROL SYSTEM SENSING - A method for monitoring an image printing system that prints color images on an image bearing surface movable in a process direction is provided. The method includes placing marking material to form a row comprising a plurality of registration marks on the image bearing surface, wherein each row of registration marks extends along a cross-process direction transverse to the process direction; detecting a position of each registration mark using a linear array sensor extending in the cross-process direction, wherein the position of each registration mark is detected in both the process and cross-process direction; determining a process direction misregistration between the registration marks of each row in the process direction and cross-process direction misregistration between registration marks from each of the rows. | 01-21-2010 |
Shawn Patrick Updegraff, Fairport, NY US
Patent application number | Description | Published |
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20100157373 | Method and system for correlating of uniformity compensations across halftone screens - A method and system are provided for characterizing performance of a printer across a plurality of halftone screens. A first non-uniformity profile is generated by measuring printer performance. Cross-position differences between the first non-uniformity profile and selected corresponding cross-positions of a second halftone screen are detected. A scaling factor is computed relating the detected differences. Printer performance with the second halftone screen is predicted by applying the scaling factor associated with the second halftone screen to the non-uniformity profile of the first halftone screen. | 06-24-2010 |
20120086983 | METHOD AND SYSTEM FOR DIGITALLY CONTROLLING IMAGE PRINTING SYSTEM TO ACHIEVE DESIRED COLOR DENSITY OF PRINTED IMAGE - A method for controlling a tone reproduction curve of an image printing system includes generating an actual printed image tone reproduction curve using printed image data from a printed image sensor; determining a set of adjusted contone values by comparing the actual printed image tone reproduction curve with a target printed image tone reproduction curve, where the adjusted contone values being representative of the print contone values at which target color density data of the printed image is achieved in the image printing system; and determining adjusted image transfer surface reflectance data to update a target image transfer surface tone reproduction curve, where the adjusted image transfer surface reflectance data being obtained by interpolating the target image transfer surface tone reproduction curve at the adjusted contone values; and controlling subsequent toner image data to achieve the updated target image transfer surface tone reproduction curve. | 04-12-2012 |