Erect image telescope optical system

Details Erect image telescope optical system Erect image telescope optical system

1978-08-07

1980-09-09

Henry, Jon W.

G02B 1708

Patent

active

042214599

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.

REFERENCES:
patent: 620978 (1899-03-01), Schupmann
patent: 3887931 (1975-06-01), Baker
patent: 4101195 (1978-07-01), Korsch

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