Patents by Inventor Gerhard Risch

Gerhard Risch 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).

  • Wide-angle objective
    Patent number: 5056901
    Abstract: A wide-angle objective for a picture-taking lens of an aerial mapping camera, consisting of 11 lenses and 14 glass-air surfaces, the first optical element of which after the center aperture on the picture side is a converging fluorspar or fluorspar-like lens. Due to the large refractive index difference between this lens and the following meniscus lens and due to the provision of a triple group of high refractive index on the object side before the center aperture, a high resolution, low residual distortion and minimal lateral chromatic aberration are achieved.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: October 15, 1991
    Assignee: Jenoptik Jena G.m.b.H.
    Inventors: Gerd Rieche, Gerhard Risch