Patents by Inventor Michael B. Monahan

Michael B. Monahan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10635954
    Abstract: A printer includes a plurality of dot clock signal generators, each of which generates dot clock signals for operating ejectors in a printhead in a color station of the printer. The dot clock signal generators are connected in a chain that corresponds to the process direction of the color stations in the printer. Each dot clock signal generator is configured to count dot clock signals of a preceding dot clock signal generator in the chain or a reference clock generator to determine when the dot clock signal generator turns on and to count encoder signals corresponding to movement of a substrate through the printer to determine when to generate dot clock signals for a color station.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: April 28, 2020
    Assignee: Xerox Corporation
    Inventors: Patricia J. Donaldson, Michael B. Monahan
  • Patent number: 10616447
    Abstract: A color management system acquires first color data for a color patch of a test pattern printed by a first image forming device on a recto side of a sheet, acquires second color data for the color patch in the test pattern printed by the first image forming device; and acquires third color data for a corresponding color patch in the test pattern printed by a second image forming device on a recto side of a sheet which has passed through the first image forming device. The system applies a correction to the third color data, which is a function of a difference between the first color data and the second color data and which may also be a function of a difference between the second color data and the third color data.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: April 7, 2020
    Assignee: XEROX CORPORATION
    Inventors: Stuart A. Schweid, Michael B. Monahan
  • Publication number: 20200104655
    Abstract: A printer includes a plurality of dot clock signal generators, each of which generates dot clock signals for operating ejectors in a printhead in a color station of the printer. The dot clock signal generators are connected in a chain that corresponds to the process direction of the color stations in the printer. Each dot clock signal generator is configured to count dot clock signals of a preceding dot clock signal generator in the chain or a reference clock generator to determine when the dot clock signal generator turns on and to count encoder signals corresponding to movement of a substrate through the printer to determine when to generate dot clock signals for a color station.
    Type: Application
    Filed: October 2, 2018
    Publication date: April 2, 2020
    Inventors: Patricia J. Donaldson, Michael B. Monahan
  • Patent number: 10382655
    Abstract: A method of balancing responses of a plurality of sensor chips arranged generally in a linear array comprising: exposing the plurality of sensor chips to an absence of illumination; measuring a dark response of each photosensor of a plurality of photosensors; positioning a calibration piece within a field of view of the plurality of sensor chips other than a calibration sensor chip; illuminating a calibration standard and the calibration piece with a light source; measuring a light response of each photosensor of the plurality of photosensors; applying an offset to the light response of each photosensor of the plurality of photosensors by subtracting the dark response of each photosensor of the plurality of photosensors to obtain an offset light response for each photosensor of the plurality of photosensors; calculating a mean offset light response for each sensor chip of the plurality of sensor chips by averaging the offset light response for each photosensor of the plurality of photosensors in each sensor c
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: August 13, 2019
    Assignee: Xerox Corporation
    Inventors: Stuart A. Schweid, Michael B. Monahan, Robert P. Herloski, Martin E. Hoover
  • Patent number: 10261286
    Abstract: A DMD chip includes a micromirror array mounted on a very thin silicon wafer attached to a cooling system integrated within the DMD chip. The cooling system includes a fluid cooled heat sink with a cooling channel. Fluid coolant may be pumped through the channel and out of the DMD to remove heat from the silicon substrate and the micromirror array. The micromirror array may be hermetically sealed within the housing, with the heat sink located between the micromirror array and a back wall of the housing, with both the heat sink and the array within the interior of the housing.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: April 16, 2019
    Assignee: Xerox Corporation
    Inventors: Francisco Zirilli, Michael B. Monahan, Jeffrey J. Bradway
  • Publication number: 20190025542
    Abstract: A DMD chip includes a micromirror array mounted on a very thin silicon wafer attached to a cooling system integrated within the DMD chip. The cooling system includes a fluid cooled heat sink with a cooling channel. Fluid coolant may be pumped through the channel and out of the DMD to remove heat from the silicon substrate and the micromirror array. The micromirror array may be hermetically sealed within the housing, with the heat sink located between the micromirror array and a back wall of the housing, with both the heat sink and the array within the interior of the housing.
    Type: Application
    Filed: July 18, 2017
    Publication date: January 24, 2019
    Inventors: Francisco ZIRILLI, Michael B. MONAHAN, Jeffrey J. BRADWAY
  • Publication number: 20190020788
    Abstract: A method of balancing responses of a plurality of sensor chips arranged generally in a linear array comprising: exposing the plurality of sensor chips to an absence of illumination; measuring a dark response of each photosensor of a plurality of photosensors; positioning a calibration piece within a field of view of the plurality of sensor chips other than a calibration sensor chip; illuminating a calibration standard and the calibration piece with a light source; measuring a light response of each photosensor of the plurality of photosensors; applying an offset to the light response of each photosensor of the plurality of photosensors by subtracting the dark response of each photosensor of the plurality of photosensors to obtain an offset light response for each photosensor of the plurality of photosensors; calculating a mean offset light response for each sensor chip of the plurality of sensor chips by averaging the offset light response for each photosensor of the plurality of photosensors in each sensor c
    Type: Application
    Filed: July 17, 2017
    Publication date: January 17, 2019
    Inventors: Stuart A. Schweid, Michael B. Monahan, Robert P. Herloski, Martin E. Hoover
  • Publication number: 20180337208
    Abstract: A sensor chip formed from a plurality of sensor chips fabricated on a wafer, the wafer including a top surface, a bottom surface opposite the top surface and a thickness between the top and bottom surfaces, the sensor chip including an active area formed on the top surface, a first sacrificial edge including a first fiducial and a second fiducial, and a first score line formed in a first portion of the thickness on the top surface between the first sacrificial edge and the active area.
    Type: Application
    Filed: May 16, 2017
    Publication date: November 22, 2018
    Inventors: Joseph F. Casey, Gary D. Redding, Craig Alan Zufelt, Michael B. Monahan
  • Patent number: 10134793
    Abstract: A sensor chip formed from a plurality of sensor chips fabricated on a wafer, the wafer including a top surface, a bottom surface opposite the top surface and a thickness between the top and bottom surfaces, the sensor chip including an active area formed on the top surface, a first sacrificial edge including a first fiducial and a second fiducial, and a first score line formed in a first portion of the thickness on the top surface between the first sacrificial edge and the active area.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: November 20, 2018
    Assignee: Xerox Corporation
    Inventors: Joseph F. Casey, Gary D. Redding, Craig Alan Zufelt, Michael B. Monahan
  • Patent number: 10120162
    Abstract: An apparatus and a method for cooling a digital mirror device are disclosed. For example, the apparatus includes a digital mirror device (DMD), a thermal pad, wherein a first side of the thermal pad is coupled to a bottom of a housing of the DMD and a cooling block coupled to a second side of the thermal pad that is opposite the first side. The cooling block includes a plate that includes a plurality of openings that generates a liquid jet of a liquid that is forced through the plurality of openings towards a side of the cooling block coupled to the thermal pad.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: November 6, 2018
    Assignee: Xerox Corporation
    Inventors: Francisco Zirilli, Michael B. Monahan, Jeffrey John Bradway
  • Publication number: 20180120533
    Abstract: An apparatus and a method for cooling a digital mirror device are disclosed. For example, the apparatus includes a digital mirror device (DMD), a thermal pad, wherein a first side of the thermal pad is coupled to a bottom of a housing of the DMD and a cooling block coupled to a second side of the thermal pad that is opposite the first side. The cooling block includes a plate that includes a plurality of openings that generates a liquid jet of a liquid that is forced through the plurality of openings towards a side of the cooling block coupled to the thermal pad.
    Type: Application
    Filed: November 3, 2016
    Publication date: May 3, 2018
    Inventors: FRANCISCO ZIRILLI, Michael B. Monahan, Jeffrey John Bradway
  • Patent number: 9578209
    Abstract: The present disclosure relates to systems and computer-implemented methods for obtaining both high-resolution red-green-blue (RGB) data and other data of an image-bearing surface using a single sensor array. The technique includes obtaining, using a sensor array configured to obtain measurements of M?4 different spectral sensitivity responses per output pixel at low resolution, spectrophotometric data representing a plurality of output pixels representing the image-bearing surface, determining, using at least one electronic processor and based on the spectrophotometric data, high-resolution RGB data representing the image-bearing surface, determining, using at least one electronic processor and based on the spectrophotometric data, additional data representing a plurality of output pixels representing the image-bearing surface, and outputting the high-resolution RGB data and the additional data.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: February 21, 2017
    Assignee: XEROX CORPORATION
    Inventors: Robert P. Herloski, Stuart A. Schweid, Michael B. Monahan
  • Publication number: 20160323480
    Abstract: The present disclosure relates to systems and computer-implemented methods for obtaining both high-resolution red-green-blue (RGB) data and other data of an image-bearing surface using a single sensor array. The technique includes obtaining, using a sensor array configured to obtain measurements of M?4 different spectral sensitivity responses per output pixel at low resolution, spectrophotometric data representing a plurality of output pixels representing the image-bearing surface, determining, using at least one electronic processor and based on the spectrophotometric data, high-resolution RGB data representing the image-bearing surface, determining, using at least one electronic processor and based on the spectrophotometric data, additional data representing a plurality of output pixels representing the image-bearing surface, and outputting the high-resolution RGB data and the additional data.
    Type: Application
    Filed: April 28, 2015
    Publication date: November 3, 2016
    Inventors: Robert P. Herloski, Stuart A. Schweid, Michael B. Monahan
  • Patent number: 9409389
    Abstract: Devices and methods load a firing distance into a distance counter of a printing device. The firing distance is the distance from the current position of a printhead of the printing device to a marking location on a substrate. These devices and methods count the firing distance in discrete distance increments using the distance counter, based on relative movement of the substrate and printhead. When the distance counter reaches the last discrete distance increment of the firing distance, these devices and methods load the fractional remaining distance of the firing distance into a time counter of the printing device. Then, such devices and methods count the fractional remaining distance in velocity-based distance increments at regular time intervals using the time counter. When the time counter reaches the last velocity-based distance increment of the fractional remaining distance, these devices and methods transfer the marking material from the printhead to the substrate.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: August 9, 2016
    Assignee: Xerox Corporation
    Inventors: Patricia J. Donaldson, Michael B. Monahan, Joseph L. Filion
  • Patent number: 9375962
    Abstract: A method of analyzing a printed test pattern includes printing first and second rows of marks, each row including at least two pluralities of marks. A gap between two pluralities of marks in the first row is located in a first position in a cross-process direction that is different than a second position of another gap between pluralities of marks in the second row. A controller identifies the first row of marks with reference to a predetermined set of image data corresponding to the first row of marks including the first plurality of marks, the second plurality of marks, and the gap in the first row.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: June 28, 2016
    Assignee: Xerox Corporation
    Inventors: Patricia J. Donaldson, Michael B. Monahan, James P. Calamita
  • Patent number: 8335457
    Abstract: Disclosed are image processing methods and systems to control the synchronization of two or more photoreceptor belts associated with an image processing system. According to one exemplary method, the phase error of a slave printing engine photoreceptor belt is controlled by modifying the speed of the slave printing engine photoreceptor belt by an increment which is a function of a predetermined image on image registration tolerance associated with the slave printing engine. Notable, the phase error is controlled while the slave printing engine develops an image on its respective photoreceptor belt.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: December 18, 2012
    Assignee: Xerox Corporation
    Inventors: David A. Hughes, Michael B. Monahan
  • Publication number: 20110243610
    Abstract: Disclosed are image processing methods and systems to control the synchronization of two or more photoreceptor belts associated with an image processing system. According to one exemplary method, the phase error of a slave printing engine photoreceptor belt is controlled by modifying the speed of the slave printing engine photoreceptor belt by an increment which is a function of a predetermined image on image registration tolerance associated with the slave printing engine. Notable, the phase error is controlled while the slave printing engine develops an image on its respective photoreceptor belt.
    Type: Application
    Filed: April 1, 2010
    Publication date: October 6, 2011
    Applicant: XEROX CORPORATION
    Inventors: David A. Hughes, Michael B. Monahan
  • Patent number: 7738802
    Abstract: A method and system for providing dynamic sensor positioning in a color image forming device. Movably mounted sensors are provided in color printers and color reproduction devices allowing for a single sensor to be utilized in a plurality of positions corresponding to a plurality of color control patches, resulting in reduced production and operating costs. In particular, a color xerographic device is provided with a movably mounted ESV that can be positioned substantially adjacent to a plurality of color control patches, thereby, allowing for a single ESV in a multi-color image forming device.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: June 15, 2010
    Assignee: Xerox Corporation
    Inventors: James J. Spence, Michael J. Martin, Michael B. Monahan
  • Publication number: 20090162083
    Abstract: A method and system for providing dynamic sensor positioning in a color image forming device. Movably mounted sensors are provided in color printers and color reproduction to a plurality of color control patches, resulting in reduced production and mounted ESV that can be positioned substantially adjacent to a plurality of color control patches, thereby, allowing for a single ESV in a multi-color image forming device.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 25, 2009
    Applicant: XEROX CORPORATION
    Inventors: James J. SPENCE, Michael J. MARTIN, Michael B. MONAHAN
  • Patent number: 6879796
    Abstract: A constant torque split is maintained between a pair of drive motors for the photoreceptor belt of an electrophotographic printing machine. By varying the voltage applied to the motors according to the speed of the photoreceptor belt, the torque applied by each motor can be continuously balanced at a predetermined relationship to apply a constant torque and the desired speed may be accurately maintained. To better refine the implementation, the relationship include a ratio and an offset which may be applied, to one of the motors. Furthermore, this offset is ramped up during motor acceleration to optimize motion quality and system performance.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: April 12, 2005
    Assignee: Xerox Corporation
    Inventors: Michael B. Monahan, David A. Hughes