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:
Sep. 09, 1980
Filed:
Aug. 07, 1978
William E Fisher, Charlotte, MI (US);
Other;
Abstract
A simplified catadioptric image erection telescope system of the Gregorian type and having two light axes is described. The system includes a first conventional magnifying refractor as an objective with plural elements which correct for chromatic, spherical and like aberrations and fosuses light on a first axis towards a smaller, flat surfaced, main mirror set at an angel alpha to a perpendicular to the mirror surface and to the focal axis of the objective which establishes an angle of inclination of the main mirror. The main mirror in turn reflects and directs the light on a second focal axis at an angle beta to the first axis where it focuses at F-2 in an inverted image in front of a still smaller secondary concave collecting mirror. The collecting mirror in turn reflects and focuses the light in an elongated focus on the second axis past an oval aperture in the main mirror where the erect image is formed at F-3. The erect image can be viewed with a second magnifying refractor or eyepiece mounted on the second axis as is conventionally used in telescopes or telephoto photographic lenses.