Wide angle projection lens

Details Wide angle projection lens Wide angle projection lens

1985-09-13

1989-01-31

Corbin, John K.

350412, 350469, G02B 1318, G02B 900, G02B 934

Patent

active

048011967

ABSTRACT:
A wide angle projection lens which comprises from the image end a first lens unit of negative power having at least one aspheric surface, a second positive lens unit comprising at least two elements and a third negative element having an aspheric concave to the image, where the first lens unit provides negative power to the overall lens and serves as an aberration corrector including some field curvature.

REFERENCES:
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Cox "A System of Optical Design" published by Focal Press 1965, pp. 470-482.
Diagrams by Applicant Entitled "Advent Lens Mod II".
"Minimax Approximation by a Semi-Circle" by Charles B. Dunham and Charles R. Crawford, published in the Society for Industrial and Applied Mathematics Journal, vol. 17, No. 1, Feb. 1980.

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