The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 1980
Filed:
May. 16, 1979
Friedrich Aurin, Heidenheim-Schnaitheim, DE;
Helmut Knutti, Oberkochen, DE;
Other;
Abstract
An optical focusing system having two mirrors with reflecting surfaces in the shape of ellipsoids of revolution. They are positioned relative to each other so that the second mathematical focal point of the first ellipsoid coincides with the first mathematical focal point of the second ellipsoid, counting the focal points in the direction of passage of the light, and the entrance pupil of the system lies at the first mathematical focal point of the first ellipsoid. The ratio of the length of the major axis to the length of the minor axis of the second ellipsoid is selected so that the isoplanasie condition for elimination of coma of third order is satisfied.