Zoom lens of two-unit construction

Details Zoom lens of two-unit construction Zoom lens of two-unit construction

1994-03-21

1995-09-19

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359691, 359713, G02B 1514, G02B 1318

Patent

active

054521343

ABSTRACT:
In a zoom lens of two-unit construction comprising a first lens unit having negative refractive power as a whole and a second lens unit having positive refractive power as a whole, the first lens unit comprises, in succession from the object side, a negative lens having its concave surface of sharp curvature facing the image side and a positive lens having its convex surface facing the object side, the second lens unit has, in succession from the object side, at least a positive lens, a positive lens, a negative lens having its concave surface of sharp curvature facing the image side, and a positive lens having its convex surface of sharp curvature facing the image side, the first lens unit has at least one aspherical surface, and the zoom lens satisfies the condition that 0.65<.vertline.f.sub.1 /(f.sub.w .multidot.f.sub.T).sup.1/2 .vertline..ltoreq.1.1.

REFERENCES:
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patent: 4304466 (1981-12-01), Betensky
patent: 4400064 (1983-08-01), Ikemori et al.
patent: 4469412 (1984-09-01), Tajima et al.
patent: 4477153 (1984-10-01), Suda et al.
patent: 4560253 (1985-12-01), Ogino
patent: 4585314 (1986-04-01), Tateoka
patent: 5076677 (1991-12-01), Sato
patent: 5182673 (1993-01-01), Kikuchi et al.

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