Simple wide-angle zoom lens

Details Simple wide-angle zoom lens Simple wide-angle zoom lens

1999-02-12

2000-03-21

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359682, G02B 1514

Patent

active

060409495

ABSTRACT:
A wide-angle zoom lens of simple construction, having only four lens elements and three lens groups is disclosed. The refractive power of the lens groups is, in order from the object side, negative, positive and positive. An aperture stop 1 is arranged between the first lens group G.sub.1 and the second lens group G.sub.2. The lens is intended for use in a compact electronic still camera having a small overall length as well as a small lens diameter. When zooming, the position of the second lens group and the third lens group is varied along the optical axis. Predetermined conditions are satisfied in order to obtain a compact zoom lens having high optical performance over the entire range of zoom.

REFERENCES:
patent: 4018510 (1977-04-01), Bertele
patent: 4170402 (1979-10-01), Nakagawa
patent: 4380376 (1983-04-01), Suda
patent: 4828372 (1989-05-01), Betensky et al.
patent: 4854680 (1989-08-01), Kikuchi
patent: 5015077 (1991-05-01), Ueda
patent: 5157550 (1992-10-01), Tsuchida et al.
patent: 5381265 (1995-01-01), Ohshita

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