| Patent Number |
Title Of Patent |
Date Issued |
| 7552986 |
Systems and methods for reducing process direction registration errors of a printhead using a li |
June 30, 2009 |
| Systems and methods are provided for detecting process direction registration errors in a printer. The errors are detected by analyzing a metric of a dash minimum response obtained from a test pattern. The test pattern contains dashes. At least one dash is shifted in the process dire |
| 7548316 |
System and method for lead edge and trail edge sheet constraint and curl sensing |
June 16, 2009 |
| A lead edge and/or trail edge sheet curl sensing and constraint method and system. First and second light emitters and detector pairs are aligned such that the light beams from the first light emitter and second light emitter cross at the transport media sheet substrate path, which c |
| 7545519 |
Lead edge sheet curl sensor |
June 9, 2009 |
| A lead edge sheet curl sensor apparatus and method are disclosed. In general, a first and a second light emitter are aligned wherein the light beams from the first light emitter and second light emitter cross. The first and second light emitter beams cross at the transport media sheet |
| 7543911 |
Systems and methods for reducing cross process direction registration errors of a printhead usin |
June 9, 2009 |
| Systems and methods are provided for determining registration errors in the cross process direction of a printer. A first straight line is obtained by detecting line centers of a first plurality of dashes in a test pattern. A second straight line is obtained by detecting a line cente |
| 7427118 |
Systems and methods for detecting intermittent, weak and missing jets with an inline linear arra |
September 23, 2008 |
| Systems and methods are provided for detecting intermittent, weak or missing jets of a printer. The detection is implemented using a test pattern. Detected failed jets may be confirmed using a verification target. A printhead containing nozzles corresponding to detected failed jets m |
| 7309118 |
Systems and methods for reducing cross process direction registration errors of a printhead usin |
December 18, 2007 |
| Systems and methods are provided for determining registration errors in the cross process direction of a printer. A first straight line is obtained by detecting line centers of a first plurality of dashes in a test pattern. A second straight line is obtained by detecting a line cente |
| 7256411 |
Systems and methods for improving calibration of a linear array sensor |
August 14, 2007 |
| Systems and methods provide calibration for a linear array sensor. A test pattern having a plurality of lines is used. Comparison between expected and measured spacing between a pair of neighboring lines is used to determine sensor position displacement. |
| 7194216 |
Method and apparatus for measuring toner concentration |
March 20, 2007 |
| A device to measure toner concentration can include a selector that selects a type of developer material to be measured and a sensor that detects an amount of light reflected off a developer material. A controller within the device can determine a value corresponding to a toner conce |
| 7193638 |
Systems and methods for sensing skew and bow of a raster optical scanner using a full width arra |
March 20, 2007 |
| System and methods are provided for detecting color separation misalignment in raster optical scanners. A dash minimum response curve is obtained from a plurality of minimal responses sensed from a plurality of dashes in a test pattern. The frequency of the dash minimum response curv |
| 7154110 |
Systems and methods for improving calibration of a linear array sensor |
December 26, 2006 |
| Systems and methods provide calibration for a linear array sensor. A test pattern having a plurality of lines is used. Comparison between expected and measured spacing between a pair of neighboring lines is used to determine sensor position displacement. |
| 6931219 |
Led color specific optical toner concentration sensor |
August 16, 2005 |
| An apparatus and method for determining toner concentration of a sample comprised of toner and carrier, including exposing the sample to light; the exposing includes emitting light at a predefined wavelength based upon the color of the toner; detecting the light reflected off the sample |
| 6462821 |
Developability sensor with diffuse and specular optics array |
October 8, 2002 |
| A developability sensing system with an optical sensor for measuring the density of imaging material samples on an imaging surface of a printer, with an illumination source and photosensor system for measuring the amount of reflected illumination from the imaging materials. A first lens |
| 6456310 |
Bi-cell chevrons detection color registration system for color printing |
September 24, 2002 |
| In color printing with a color registration system for the registration of plural color images on an image bearing surface, such as a photoreceptor belt of a color printer, chevron shaped registration marks are imaged on the image bearing surface, which registration marks correspond to t |
| 6381426 |
Automatic gain control for electrostatic voltmeters |
April 30, 2002 |
| Method and apparatus for controlling amplifier gain, e.g., as used in ESV of a xerographic copier, has a light source, e.g., an LED, optically coupled to a gain control light dependent resistor (LDR). The LDR can be in a negative feedback loop around an amplifier. There is a voltage |
| 5751443 |
Adaptive sensor and interface |
May 12, 1998 |
| A sensor detects the presence of opaque and transparent copy substrates in a substrate transporting path and includes an LED disposed near the transporting path for projecting light toward a reflector on the opposite side of the media transport path and a phototransistor located relative |
| 5581335 |
Programmable toner concentration and temperature sensor interface method and apparatus |
December 3, 1996 |
| In accordance with the present invention a toner concentration and temperature sensing apparatus is provided for use with a developer container adapted to retain a quantity of developer material, the developer material including varying concentrations of magnetic carrier material and |
| 5519497 |
Control develop mass in a color system |
May 21, 1996 |
| An infrared densitometer which measures the diffuse component of reflectivity as marking particles are progressively deposited on a moving photoconductive belt. Collimated light rays are projected onto a test patch including the marking particles. The light rays reflected from the te |
| 5243292 |
Electrostatic measuring tuning fork and means for limiting mechanical amplitude thereof |
September 7, 1993 |
| An electrostatic measuring apparatus for measuring unknowns such as the electrostatic potential of a surface in a non-contacting manner, including a tuning fork and a sensing electrode, and in which the frequencies of two different vibration modes of the fork are separated by a slotted |
| 5166729 |
Toner concentration sensing apparatus |
November 24, 1992 |
| In accordance with the present invention an apparatus is provided for use with a developer container adapted to retain a quantity of developer material, the developer material including varying concentrations of magnetic carrier material and toner material. The toner concentration se |
| 5083161 |
Densitometer for measuring developability |
January 21, 1992 |
| An infrared densitometer which measures the reflectivity of a selected region on a moving photoconductive belt covered at least partially with marking particles. Collimated light rays are projected onto the selected region of the moving photoconductive member with or without marking |
| 5078497 |
Densitometer for a liquid developer material |
January 7, 1992 |
| A densitometer which measures the reduction in the specular component of the reflectivity of a portion of a surface having a liquid deposited thereon. Collimated light rays, in the visible spectrum, are projected onto the portion of the surface having the liquid thereon. The light rays |
| 4831410 |
Automatic exposure control system for flash exposure photocopiers |
May 16, 1989 |
| A flash exposure photocopier provides a mechanism for automatically controlling photoreceptor exposure levels to compensate for the effects of documents having backgrounds of different densities. A photosensor and lens assembly is located within a flash housing in a position whereby a |
