Optical: systems and elements – Image stabilization – By movable refractive structure
Patent
1997-10-21
1998-12-08
Epps, Georgia Y.
Optical: systems and elements
Image stabilization
By movable refractive structure
359676, 359684, 359682, G02B 2764, G02B 1514
Patent
active
058478752
ABSTRACT:
A large diameter zoom lens includes a large zooming ratio which is capable of faster auto focussing (AF). A zoom lens, having a zooming ratio of not less than 1.5, includes, in order from an object side to an image side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power and a fifth lens group having positive refractive power, wherein during zooming from a maximum wide-angle state to a maximum telephoto state, the lateral magnification of the second lens group is always positive and decreases monotonically, and predetermined conditional equations are satisfied. The zoom lens includes, in order from the object side, a first lens group having a negative refractive power and a second lens group having a positive refractive power, wherein the second lens group includes, in order from the object side, a front group having a positive refractive power and a rear group having a positive refractive power, and when zooming from the maximum wide-angle state to the maximum telephoto state, the front group and the rear group move integrally and the lateral magnification of the front group at the infinite focus state is always positive and decreases monotonically.
REFERENCES:
patent: 5040881 (1991-08-01), Tsuji
patent: 5270857 (1993-12-01), Oizumi et al.
patent: 5276553 (1994-01-01), Tatsuno
patent: 5337187 (1994-08-01), Fukino et al.
patent: 5638210 (1997-06-01), Sato et al.
patent: 5666230 (1997-09-01), Tatsuno
patent: 5668668 (1997-09-01), Shibayama et al.
patent: 5684639 (1997-11-01), Ohtake
Kodama Naoko
Ohshita Koichi
Epps Georgia Y.
Lester Evelyn A.
Nikon Corporation
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