Patents by Inventor Hans-Joachim Schrecke

Hans-Joachim Schrecke 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).

  • Source distance adjustment arrangement for uniform illumination of projection surface
    Patent number: 5200603
    Abstract: A uniform illumination of the projection surface is obtained by measuring light intensity of a projection surface and adjusting a distance between a light source and an optical element in response to the measured light intensity to optimize brightness and/or distribution.
    Type: Grant
    Filed: April 22, 1992
    Date of Patent: April 6, 1993
    Assignee: Agfa-Gevaert AG
    Inventors: Hubert Hackenberg, Traugott Liermann, Hans-Joachim Schrecke