Zoom projection lens

Details Zoom projection lens Zoom projection lens

1974-10-18

1976-08-03

Corbin, John K.

350189, G02B 1500, G02B 304

Patent

active

039725928

ABSTRACT:
A zoom projection lens having six elements with a second biconcave negative element being movable for zooming. Five of the six elements are made of plastic materials and the use of aspheres on two surfaces, including one surface of the movable element, is disclosed to achieve good optical performance at a relative aperture of at least f/1.57.

REFERENCES:
patent: 2530397 (1950-11-01), Merte
patent: 2649025 (1953-08-01), Cook
patent: 3194139 (1965-07-01), Babcock
patent: 3220307 (1965-11-01), Thurow

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