Patents by Inventor Thomas Kratzer

Thomas Kratzer 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).

  • Optical observation unit and method for ensuring an unchanging illumination intensity when changing the color temperature of the illumination
    Patent number: 9829692
    Abstract: An optical observation unit (1) has an illumination apparatus (43) for illuminating an observation object (3). The illumination apparatus (43, 143) has a light source (45) emitting illumination light with a first color temperature, and a spectral filter (49) that can be inserted in the illumination beam path. The spectral filter (49) converts the illumination light with the first color temperature into illumination light with a second color temperature. The illumination apparatus further has an attenuator (51) that can be inserted in the illumination beam path in place of the spectral filter (49) and has a transmission characteristic that leads to an intensity reduction of the illumination light with the first color temperature that corresponds to the intensity reduction of the illumination light with the second color temperature by way of the spectral filter (49).
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: November 28, 2017
    Assignee: CARL ZEISS MEDITEC AG
    Inventors: Peter Reimer, Thomas Kratzer, Stefan Ernsperger, Bruno Stich
  • OPTICAL OBSERVATION UNIT AND METHOD FOR ENSURING AN UNCHANGING ILLUMINATION INTENSITY WHEN CHANGING THE COLOR TEMPERATURE OF THE ILLUMINATION
    Publication number: 20100261966
    Abstract: An optical observation unit (1) has an illumination apparatus (43) for illuminating an observation object (3). The illumination apparatus (43, 143) has a light source (45) emitting illumination light with a first color temperature, and a spectral filter (49) that can be inserted in the illumination beam path. The spectral filter (49) converts the illumination light with the first color temperature into illumination light with a second color temperature. The illumination apparatus further has an attenuator (51) that can be inserted in the illumination beam path in place of the spectral filter (49) and has a transmission characteristic that leads to an intensity reduction of the illumination light with the first color temperature that corresponds to the intensity reduction of the illumination light with the second color temperature by way of the spectral filter (49).
    Type: Application
    Filed: April 14, 2010
    Publication date: October 14, 2010
    Applicant: CARL ZEISS SURGICAL GMBH
    Inventors: Peter Reimer, Thomas Kratzer, Stefan Ernsperger, Bruno Stich