Optical: systems and elements – Lens – With variable magnification
Patent
1993-11-12
1995-04-11
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359708, G02B 1514, G02B 1318
Patent
active
054064163
ABSTRACT:
A wideangle-range-covering zoom lens comprises a first lens group having a negative refracting power, a second lens group having a positive refracting power, which is arranged coaxially with the first lens group and adjacent to the first lens group on a side thereof opposite to a subject, a third lens group having a positive refracting power, which is arranged coaxially with the second lens group and adjacent to the second lens group on a side thereof opposite to the subject, and a fourth lens group having a negative refracting power, which is arranged coaxially with the third lens group and adjacent to the third lens group on a side thereof opposite to the subject, in which the lens groups are relatively moved in zooming from a wideangle end to a telephoto end such that a gap decreases between the first lens group and the second lens group, a gap increases between the second lens group and the third lens group, and a gap decreases between the third lens group and the fourth lens group, and in which predetermined conditions are satisfied.
REFERENCES:
patent: 4787718 (1988-11-01), Cho
patent: 5111338 (1992-05-01), Nakayama
Nikon Corporation
Sugarman Scott J.
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