Compact zoom lens

Details Compact zoom lens Compact zoom lens

1991-10-02

1993-07-20

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

052298876

ABSTRACT:
A zoom lens comprises a first lens group having the positive refractivity which relatively travels along the optical axis to change the distance between the groups for varying powers, and a second lens group having negative refractivity. The first lens group has sequentially from an object side a first positive lens component, a second negative lens component, a third lens component having positive refractivity, a fourth positive lens component, and fifth lens component having positive refractivity, and the second lens group has sequentially from the object side a sixth positive lens component, a seventh negative lens component, and an eighth negative lens component. Further, the first lens group includes a diaphragm adjacent to the fifth lens component, and the zoom lens is characterized in being structured to satisfy conditions given below.

REFERENCES:
patent: 4909613 (1990-03-01), Kikuchi
patent: 4998808 (1991-03-01), Shibayama

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