Zoom lens

Details Zoom lens Zoom lens

1991-11-06

1994-02-08

Arnold, Bruce A.

Optical: systems and elements

Lens

With variable magnification

359684, 359687, 359738, G02B 1514, G02B 908

Patent

active

052853160

ABSTRACT:
A zoom lens construction of the type including from the object side a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. The first and third lens groups being held stationary, the second lens group being movable along the optical axis for zooming operation, and the fourth lens group being movable to maintain a plane of focus in compensation for variations in subject distance and shifts of focal point resulting from zooming operations. The zoom lens comprising a stop provided between the second and third lens groups movably along the optical axis, and arranged to be located closer to the imaging plane at the longest focal length of a zooming range than at the shortest focal length thereof.

REFERENCES:
patent: 4256381 (1981-03-01), Kreitzer
patent: 4299453 (1981-11-01), Momiyama et al.
patent: 4802747 (1989-02-01), Horiuchi
patent: 4844599 (1989-07-01), Ito
patent: 4859042 (1989-08-01), Tanaka
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5138492 (1992-08-01), Hamano et al.

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