Patents by Inventor David G. Norrie

David G. Norrie 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).

  • Lateral and longitudinal chromatic dispersion correction in display systems employing non-conformal reflection holograms
    Patent number: 5396349
    Abstract: An optical system for a display having a combiner (1) with a non-conformal reflection hologram and in which an intermediate image (II) of a display source is formed at a location in the light path to and spaced from the combiner (1), the system comprising at least one diffractive element (5,7) disposed in the light path between the display source (2) and the intermediate image (II) and arranged to counter, at least partially, the chromatic dispersion of the non-conformal reflection hologram (1).
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: March 7, 1995
    Assignee: Pilkington P.E. Limited
    Inventors: Martin D. Roberts, Anthony J. Kirkham, David G. Norrie
  • Infra-red optical systems
    Patent number: 4600265
    Abstract: An `eye-piece` system for a non-Galilean afocal infra-red telescope designed to contribute to astigmatism correction, pupil match, and true afocality without undue increase in objective aperture requirements comprises a positively powered back group and a negatively powered front group consisting of a rear lens element with a convex rear surface and a front lens element with a concave front surface, there being a negatively powered gas lens between the rear and front elements of the front group. The objective system may be catadioptric.
    Type: Grant
    Filed: January 24, 1984
    Date of Patent: July 15, 1986
    Assignee: Pilkington P.E. Limited
    Inventor: David G. Norrie