Optical: systems and elements – Lens – With variable magnification
Patent
1996-07-19
1998-07-07
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359676, G02B 1514
Patent
active
057777993
ABSTRACT:
The invention provides a three-lens-group zoom lens system which, albeit having a zoom ratio of 3.5 or even more, is compact, well corrected for various aberrations including chromatic aberration and distortion, and excellent in the ability to form images, comprises, in order from an object side, a first lens group G1 having positive refracting power, a second lens group G2 having positive refracting power and a third lens group G3 having negative refracting power, in which, in zooming from a wide-angle side to a telephoto side, an air separation between the first and second lens groups G1 and G2 increases while an air separation between the second and third lens groups G2 and G3 decreases. The first lens group G1 comprises, in order from the object side, a double concave lens, a positive lens and a positive lens, and satisfies the following conditions (1) and (2):
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patent: 5105311 (1992-04-01), Tokumaru et al.
patent: 5218476 (1993-06-01), Ito
patent: 5523888 (1996-06-01), Nishio
Epps Georgia Y.
Olympus Optical Co,. Ltd.
Schwartz Jordan M.
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