Optical: systems and elements – Lens – With variable magnification
Patent
1996-10-25
1998-08-25
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359686, 359689, 359691, G02B 1514
Patent
active
057988714
ABSTRACT:
A zoom lens is composed of a first lens group of a negative refractive power, a second lens group of a positive refractive power and a third lens group of a positive refractive power, in which, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases and the distance between the second and third lens groups varies.
REFERENCES:
patent: 4787718 (1988-11-01), Cho
patent: 5157550 (1992-10-01), Tsuchida et al.
patent: 5241421 (1993-08-01), Endo et al.
Fujita Takanori
Shibayama Atsushi
Suzuki Masatoshi
Epps Georgia Y.
Lester Evelyn A.
Nikon Corporation
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