Zoom lens capable of focusing at close range

Details Zoom lens capable of focusing at close range Zoom lens capable of focusing at close range

1995-11-21

1997-12-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

056966326

ABSTRACT:
A zoom lens is capable of focusing at a close range and the focusing lens group can be controlled with a small memory capacity. The zoom lens includes, in order from the object side to the image side of the zoom lens, a first variable power unit GH, which has at least two variable power zoom lens groups movable along the optical axis for zooming, and a focusing lens group GF movable along the optical axis when focusing on close range objects. The magnification BF of the focusing lens group GF is selected such that 1/.vertline..beta.F.vertline.<0.35 is satisfied over the entire zooming range of the zoom lens from wide-angle end to telephoto end.

REFERENCES:
patent: 4844600 (1989-07-01), Tokumaru
patent: 5042926 (1991-08-01), Kikuchi
patent: 5164859 (1992-11-01), Ito
patent: 5172273 (1992-12-01), Yamanashi
patent: 5329401 (1994-07-01), Sato

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