Compact wide-angle lens

Details Compact wide-angle lens Compact wide-angle lens

1998-02-17

1999-12-07

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

059993324

ABSTRACT:
A compact wide-angle lens having a front lens group of positive refractive power and a rear lens group of negative refractive power. The front lens group is composed of three lens elements having refractive powers, in order from the object side, of negative, positive, and positive, and the rear lens group is composed of a negative meniscus lens element. The front lens group is composed of a negative meniscus lens element with its concave surface nearest the photographic object side, a positive meniscus lens element of weak refractive power with its convex surface on the photographic object side, and a biconvex lens element. A surface of the second lens element of the front lens group is made to be aspheric and conditional equations are required to be satisfied in order to make the lens have good imaging performance over a wide-angle field of view of approximately 70 degrees.

REFERENCES:
patent: 5270867 (1993-12-01), Estelle
patent: 5796527 (1998-08-01), Ohtake

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