Zoom lens

Details Zoom lens Zoom lens

1996-02-28

1997-09-16

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

056686676

ABSTRACT:
Disclosed is a zoom lens comprising at least three movable lens units. The zoom lens comprises a first lens unit disposed closest to an object side and having positive refractive force. The first lens unit includes a positive cemented lens constituted by a positive lens element and a negative lens element, with a concave side of the cemented surface facing the object side. The zoom lens also comprises a last lens unit disposed closest to an image side. Upon zooming from a wide angle end to a telephoto end, at least the first lens unit and the last lens unit move toward the object side so as to increase an air gap between the first lens unit and a lens unit adjacent to the first lens unit on the image side but to decrease an air gap between the last lens unit and a lens unit adjacent to the last lens unit on the object side. The zoom lens satisfies the following condition:

REFERENCES:
patent: 5185678 (1993-02-01), Arimoto
patent: 5241421 (1993-08-01), Endo et al.
patent: 5440430 (1995-08-01), Sato

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