Telecentric zoom lens

Details Telecentric zoom lens Telecentric zoom lens

1996-02-28

1998-06-09

Nelms, Daivd C.

Optical: systems and elements

Lens

With variable magnification

359663, 359683, G02B 1514, G02B 1322

Patent

active

057644195

ABSTRACT:
A telecentric zoom lens is disclosed that comprises, in order from the magnifying side to the reducing side on an optical axis: first, second, third, fourth, and fifth lens groups having a positive, negative, negative, positive, and positive focal length, respectively. An open aperture is axially disposed between the third and fourth lens groups at the magnifying-side focal position of the combined fourth and fifth lens groups. When zooming from the maximum wide-angle state to the maximum telephoto state, the first, fourth, and fifth lens groups are stationary, while the second lens group axially moves linearly toward the reducing side and the third lens group axially moves along a convex path toward the magnifying side.

REFERENCES:
patent: 4572620 (1986-02-01), Kikuchi
patent: 4591244 (1986-05-01), Aono et al.
patent: 4618219 (1986-10-01), Sugiura et al.
patent: 4637690 (1987-01-01), Miyamae et al.
patent: 5054898 (1991-10-01), Kitagishi et al.
patent: 5095387 (1992-03-01), Horiuchi

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