Inverse telescopic wide angle lens

Details Inverse telescopic wide angle lens Inverse telescopic wide angle lens

1994-02-23

1995-12-19

Dzierzynski, Paul M.

Optical: systems and elements

Lens

Reverse telephoto

359682, 359708, 359740, 359751, G02B 1304

Patent

active

054773881

ABSTRACT:
An inverse telescopic wide angle lens comprises a diaphragm; a front lens group of an integral positive or negative refractive power, positioned in the object side in front of the diaphragm and having a first lens group of a negative refractive power including a negative lens of which an image-side air-contacting surface is formed as an aspherical surface concave to the image side, and a second lens group of a positive refractive power positioned between the first lens group and the diaphragm; and a rear lens group of an integral positive refractive power, positioned behind the diaphragm and having plural lenses. The negative lens in the first lens group is so constructed that the absolute value of the refractive power of the concave surface on the optical axis is larger than that of the refractive power of the surface at the object side on the optical axis, that the curvature of the concave surface decreases monotonously with the distance from the optical axis, and that the form of the concave surface of the negative lens at the image side satisfies a particular condition. The effective diameter of the lens closest to the object in the first lens group is so constructed as to satisfy a particular condition.

REFERENCES:
patent: 3663095 (1972-05-01), Mori
patent: 4111558 (1978-09-01), Ikemori
patent: 5170292 (1992-12-01), Yamanashi
patent: 5184251 (1993-02-01), Tsuchida et al.

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