Compact, wide magnification-variable zoom lens system

Details Compact, wide magnification-variable zoom lens system Compact, wide magnification-variable zoom lens system

1982-04-01

1985-02-12

Corbin, John K.

G02B 964, G02B 1518

Patent

active

044987412

ABSTRACT:
A zoom lens system composed of five lens groups having power of positive, negative, positive, negative and positive, among various types of the zoom lens system. The zoom lens system particularly of the type in which all of five lens groups are movable is advantageous in designing the zoom lens system. However, since these five lens groups are moved independently one another, it becomes complicated to design the barrel. In accordance with the present invention, a third positive lens group and one of the other positive lens groups may be moved integrally to effect zooming, such that the moving mechanism for the four moving groups may be used in designing the barrel, thus simplifying the construction of the barrel.

REFERENCES:
patent: 4380377 (1983-04-01), Sato et al.

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