Optical: systems and elements – Lens – With variable magnification
Patent
1999-02-12
2000-07-11
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359686, 359753, 359783, G02B 1514, G02B 934
Patent
active
060881690
ABSTRACT:
A wide-angle zoom lens is disclosed having four lens groups of negative, positive, positive, and positive refractive power, in order from the object side. By satisfying prescribed conditions, the overall length as well as the outer diameter of the wide-angle zoom lens can be kept small, the number of lens elements required can be minimized so as to keep manufacturing costs low, yet a high-quality image is provided over the entire range of zoom. During zooming, the first and fourth lens groups remain in a fixed position while the second and third lens groups are moved along the optical axis. The first lens group G.sub.1 includes at least one negative lens element with a concave surface of strong curvature on the image side. The second lens group G.sub.2 has at least one biconvex lens. The third lens group G.sub.3 may consist of a single positive lens. The following conditions are satisfied:
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patent: 5798871 (1998-08-01), Shibayama et al.
patent: 5870234 (1999-02-01), Schittof
Arnold Bruce Y.
Epps Georgia
Fuji Photo Optical Co., Ltd.
Lester Evelyn A.
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