Zoom lens system having high zoom ratio

Details Zoom lens system having high zoom ratio Zoom lens system having high zoom ratio

1997-09-03

1999-09-21

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359695, G02B 1514

Patent

active

059561840

ABSTRACT:
Zoom lens system having a high zoom ratio including, in order from the object end: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; and a fifth lens group having a positive refractive power. When the zoom lens system is operated from its maximum wide-angle state to its maximum telephoto state, the air-space separation between the first lens group and the second lens group is increased, the air-space separation between the second lens group and the third lens group is decreased, the air-space separation between the third lens group and the fourth lens group is increased, and the air-space separation between the fourth lens group and the fifth lens group is decreased, and the following condition (1) is satisfied:

REFERENCES:
patent: 4896950 (1990-01-01), Endo et al.
patent: 5189557 (1993-02-01), Endo et al.
patent: 5388004 (1995-02-01), Adachi
patent: 5526186 (1996-06-01), Sekine
patent: 5528427 (1996-06-01), Tanaka et al.

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