Zoom lens system

Details Zoom lens system Zoom lens system

1986-05-06

1987-11-24

Corbin, John K.

G02B 1516

Patent

active

047084430

ABSTRACT:
A zoom lens system comprising a first lens group having positive refractive power and having a focusing function, a second lens group having negative refractive power and having a vari-focal function, a third lens group having positive refractive power and having a vari-focal function, and a fourth lens group having positive refractive power and having a vari-focal function, wherein the second lens group comprises a negative lens having a surface with strong curvature on the image side, a cemented doublet consisting of a negative lens and a positive lens, a negative lens having a surface with strong curvature on the object side, and a positive meniscus lens having a surface with strong curvature on the object side, the zoom lens system having a large vari-focal ratio and a large aperture ratio and arranged compactly.

REFERENCES:
patent: 4632519 (1986-12-01), Takahashi

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