Patents by Inventor Dawson Ward

Dawson Ward 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).

  • Laser scanning unit and method and apparatus for calibrating a post-scan assembly in a laser scanning unit
    Patent number: 6888654
    Abstract: A laser scanning unit is provided comprising a housing; a scanning assembly including a scanning device; a first light beam source directing a first light beam toward the scanning device; a second light beam source directing a second light beam toward the scanning device; and first and second post-scan optical assemblies located to receive first and second scanning beams reflected from the scanning device. Each post-scan optical assembly may comprise a first, second and third fold mirror, a first f-theta lens located between the first and the second fold mirrors, and a second f-theta lens located to receive light reflected from the third fold mirror and outputting a compensated scanning beam for generating a scan line on a corresponding photoconductive member.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: May 3, 2005
    Assignee: Lexmark International, Inc.
    Inventors: Roger Cannon, Christopher Chee, Robert Paterson, Dawson Ward
  • Laser scanning unit and method and apparatus for calibrating a post-scan assembly in a laser scanning unit
    Publication number: 20040047016
    Abstract: A laser scanning unit is provided comprising a housing; a scanning assembly including a scanning device; a first light beam source directing a first light beam toward the scanning device; a second light beam source directing a second light beam toward the scanning device; and first and second post-scan optical assemblies located to receive first and second scanning beams reflected from the scanning device. Each post-scan optical assembly may comprise a first, second and third fold mirror, a first f-theta lens located between the first and the second fold mirrors, and a second f-theta lens located to receive light reflected from the third fold mirror and outputting a compensated scanning beam for generating a scan line on a corresponding photoconductive member.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 11, 2004
    Inventors: Roger Cannon, Christopher Chee, Robert Paterson, Dawson Ward