Zoom lens system

Details Zoom lens system Zoom lens system

1992-09-11

1994-05-24

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359716, 359791, G02B 1514, G02B 1318, G02B 912

Patent

active

053154398

ABSTRACT:
An improved zoom lens system includes at least three lens groups which are arranged, in order from the object side, as a first lens group having a positive focal length, a second lens group having a positive focal length and a third lens group having a negative focal length. When zooming is carried out from the wide angle to the telephoto end, the first, second and third lens group are all moved towards the object so that the distance between the first and second lens groups increases whereas the distance between the second and third lens groups decreases. The first lens group has a first lens element with a concave lens surface on the side the closest to object while satisfying specific conditions.

REFERENCES:
patent: 4773744 (1988-09-01), Yamanashi
patent: 4822152 (1989-04-01), Yamanashi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4854682 (1989-08-01), Yamanashi
patent: 4978204 (1990-12-01), Ito
patent: 5033832 (1991-07-01), Ito
patent: 5069536 (1991-12-01), Ogata
patent: 5196962 (1993-03-01), Aoki

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