| 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 |
| 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 |
| 5451778 |
Apparatus and method for beam steering in a raster output scanner |
September 19, 1995 |
| An apparatus and method for reliably monitoring the position of a radiant energy beam, for example, a scanning laser beam such as that produced by a raster output scanning system to expose a photoresponsive member, where the beam traverses the surface of a photoreceptive member at a high |
| 5386123 |
Beam steering sensor for a raster scanner using a lateral effect detecting device |
January 31, 1995 |
| An apparatus and method for reliably monitoring the position of a radiant energy beam, for example, a scanning laser beam such as that produced by a raster output scanning system to expose a photoresponsive member, where the beam traverses the surface of a photoreceptive member at a high |
| 5343326 |
Compact ros imaging system |
August 30, 1994 |
| The pre-polygon scanning path length of a raster output scanning system is reduced by replacing a required cylinder lens, or lenses, with two cylindrical mirrors. One mirror with a negative, concave surface and a second positive cylindrical mirror. The first mirror directs the light |
| 5321434 |
Digital color printer with improved lateral registration |
June 14, 1994 |
| A method and apparatus is provided for lateral registration of image exposures on photoreceptive belts subject to lateral deviation from linear travel. In one embodiment, a plurality of Raster Output Scanner (ROS) imagers in a digital color printer are positioned so as to form successive |
| 5319537 |
Raser output scanner color printer with improved start of scan detection and process registratio |
June 7, 1994 |
| A Raster Output Scanner (ROS) color printer is formed by providing several ROS imagers adjacent image exposure locations of a photoreceptor belt. Each ROS imager forms a separate color image in response to video input signals with each color image superimposed in registration over the |
| 5287125 |
Raster output scanner with process direction spot position control |
February 15, 1994 |
| Compensation for process direction photoreceptor motion in a Raster Output Scan system is provided by moving the cylinder lens located between the laser source and a rotating spot scanning mechanism, e.g., a polygon. The cylinder lens is moved in the process direction in response to erro |
| 5278587 |
Method and apparatus for image registration |
January 11, 1994 |
| The present invention is directed to a precise method of registering plurality of imaging stations, so as to form sequential images on a photoreceptor belt in a single pass. A belt hole is formed in the photoreceptor belt, outside the image area, but within the scan of the imager sca |
| 5166999 |
High resolution print bar system |
November 24, 1992 |
| The resolution of an LED print bar used in printing applications is modified by optically coupling the print bar, in a preferred embodiment, to a two row, square ended, reduction enlargement gradient index lens array. The lens array is modified to have a radiometric speed suitable for |
| 5142403 |
ROS scanner incorporating cylindrical mirror in pre-polygon optics |
August 25, 1992 |
| The efficiency of a raster output scanning system is enhanced by replacing a folding mirror cylindrical lens in the pre-polygon optics with a single cylindrical mirror. The mirror is designed and positioned to direct a beam input in a different direction along an optical path and to focu |
| 5140605 |
Thermally stabilized diode laser structure |
August 18, 1992 |
| A diode laser structure is thermally stabilized by passing current through heater strips along the sides of the diode laser cavity. The thermally stabilized diode laser structure comprises a first confinement layer and a substrate of one conductivity type, an active layer, a second confi |
| 4967265 |
Color correction system for an electrophotographic copying machine |
October 30, 1990 |
| A color correction system for a color copier is enabled by means of a low resolution RIS unit attached to a light/lens scan system which creates an electronic raster image simultaneously with formation of a color latent image. The RIS output signals are used to modulate the output of a R |
