Wide-angle zoom lens

Details Wide-angle zoom lens Wide-angle zoom lens

1994-11-10

1997-01-21

Eyps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

055964532

ABSTRACT:
A wide-angle zoom lens system includes a first lens group having a positive refractive power and a second lens group having a negative refractive power and spaced from the first lens group at a first distance, the first distance being variable during zooming. The first lens group includes a first lens having a positive refractive power and a convex surface toward an object, a second lens having a negative refractive power and concave surfaces, a third lens having a positive refractive power and convex surfaces, a fourth lens having a negative refractive power and convex surfaces, a fifth lens having a negative refractive power and a concave surface toward the object, and a sixth lens having a positive refractive power and one of convex and meniscus surfaces. The second lens group includes a seventh lens having a positive refractive power and a concave surface toward the object and at least one element of a negative refractive power lens. The zoom lens system having the following characteristics:

REFERENCES:
patent: 4787718 (1988-11-01), Cho
patent: 4824236 (1989-04-01), Ueda
patent: 4998808 (1991-03-01), Shibayama
patent: 5082360 (1992-01-01), Sato et al.
patent: 5144489 (1992-09-01), Shibayama
patent: 5247393 (1993-09-01), Sugawara
patent: 5398135 (1995-03-01), Ohashi

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