Zoom lens

Details Zoom lens Zoom lens

1989-05-02

1990-03-20

Arnold, Bruce Y.

350426, G02B 1514, G02B 964

Patent

active

049096133

ABSTRACT:
A zoom lens comprises a front lens group having a positive focal length and a rear lens group having a negative focal length, with the distance between the front and rear lens groups being variable for varying the magnification of the zoom lens. The front lens group comprises a first front lens group having a negative focal length and a second front lens group having a positive focal length, the first and second front lens groups being successively arranged in the order specified from an object side. The first front lens group comprises, in the order named from the object side, at least a positive lens and a negative lens. The second front lens group comprises at least one negative lens and at least two positive lenses. The rear lens group comprises, in the order specified from the object side, a positive lens, a negative lens, a negative lens, and a positive lens. The distance between the first and second front lens groups varies during zooming movement of the zoom lens.

REFERENCES:
patent: 4720179 (1988-01-01), Ito

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