Cycloramic image projection system

Optics: motion pictures – Panoramic picture type

Patent

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Details

352156, 350198, 354 94, G03B 3700

Patent

active

040788601

ABSTRACT:
A cycloramic image projection system in which an image as viewed from a central point, is projected in a complete circle about the viewer's position onto a drum-type screen. Included is a conical reflector arranged concentrically with the optical axis of a circular beam of light projected onto the reflector and which is turned in a radially outward direction and condensed through the picture area of a circular loop of film on a sprocket also concentric with the optical axis and which surrounds the reflector. A toroidal convex lens surrounds the film loop concentrically and serves to focus and project a 360.degree. image of the picture onto the screen, and the film loop is continuously wrapped on and off around the reflector whereby a continuously changing but temporarily stationary 360.degree. image is swept onto and off the screen. The sprocket and reflector are stationary, the toroidal lens is mounted on a pan table which rotates about the optical axis, and an arm on the table serves to pull the film from one reel, feed it through a slit in the lens, thence around the sprocket and back through the slit where it is rewound on the other reel.

REFERENCES:
patent: 2972281 (1961-02-01), Dresser
patent: 3141397 (1964-07-01), McNeil
patent: 3240113 (1966-03-01), Stechmesser
patent: 3850516 (1974-11-01), Mallinson

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