Three-group zoom lens

Details Three-group zoom lens Three-group zoom lens

1998-02-26

1999-06-01

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

059093188

ABSTRACT:
A three-group zoom lens having lens groups, in order from the photographic object side, of negative, positive, and positive refractive power. The zoom lens is specially designed for use in a still or video camera employing a CCD array positioned at a fixed photographic image plane. Zooming is primarily performed by moving the two lens groups nearest the photographic object side, and focusing is primarily performed by adjusting the position of the lens group nearest the photographic image side. By satisfying certain conditional expressions a distance from the exit pupil to the photographic image plane is maintained to prevent shading, a back focus length sufficient to accommodate a filter component is provided, and a compact zoom lens of high quality is obtained.

REFERENCES:
patent: 4465343 (1984-08-01), Horimoto
patent: 4647160 (1987-03-01), Ikemori
patent: 5737127 (1998-04-01), Tsutsumi

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