Optical: systems and elements – Lens – With variable magnification
Patent
1996-09-11
1998-09-29
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359717, G02B 1514, G02B 302
Patent
active
058153241
ABSTRACT:
A zoom lens system is composed of two lens units. The first lens unit is arranged at an object-side end and the second lens unit is arranged at an image-side end. The first lens unit has one lens element of a positive refractive power. The second lens unit has two lens elements. One is an aspherical plastic lens of non-refractive power. The other is a lens having a negative refractive power. During zooming from a wide angle end to a telephoto end, the distance between the first and second lens units is decreased.
REFERENCES:
patent: 5341244 (1994-08-01), Lin
patent: 5610767 (1997-03-01), Ito
Epps Georgia Y.
Lester Evelyn A.
Minolta Co. , Ltd.
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