Zoom lens

Details Zoom lens Zoom lens

1992-01-22

1993-09-21

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, 359685, 359684, 359681, 359676, 359774, 359785, 359786, G02B 1514, G02B 934, G02B 914

Patent

active

052473937

ABSTRACT:
A zoom lens comprises a first lens unit having a positive refractive power, a second lens group having a negative refractive power, an iris and a third lens unit having a positive refractive power, arranged in this sequence as viewed from an object. The third lens unit comprises a lens unit 3a and a lens unit 3b arranged in this sequence as viewed from the object, with a large air gap therebetween. Zooming from a short focal length end to a long focal length end is effected by moving the second lens group from a unit side to a image side and moving the first lens unit and the third lens unit to depict convex loci toward the object. The zoom lens meets the condition of

REFERENCES:
patent: 4380376 (1983-04-01), Suda et al.
patent: 4449791 (1984-05-01), Terasawa et al.
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4576443 (1986-03-01), Itoh
patent: 4623226 (1986-11-01), Fujii

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