Zoom lens system

Details Zoom lens system Zoom lens system

1992-07-23

1994-12-06

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

053716302

ABSTRACT:
A zoom lens system includes, in order from the object side, a first lens unit that remains fixed during zooming and which has a positive power, a second lens unit that has a zooming capability, that moves during zooming and that has a negative power, a third lens unit that has a capability of compensating for the position of the focal point, that moves during zooming and that has a negative power, and a fourth lens unit that has an imaging capability, that remains fixed during zooming and that has a positive power, said fourth lens unit comprising a first sub-unit that comprises, in order from the object side, a positive lens element, a positive lens element and a negative lens element and that has a positive overall power, and a second sub-unit that comprises, in order from the object side, a positive lens element, a negative lens element and a positive lens element and that has a positive overall power. The zoom lens system satisfies the specified conditions.

REFERENCES:
patent: 4618219 (1986-10-01), Sugiura et al.
patent: 4629293 (1986-12-01), Mihara
patent: 4634237 (1987-01-01), Aono et al.
patent: 4812024 (1989-03-01), Mukaiya
patent: 4820028 (1989-04-01), Suda et al.
patent: 4824226 (1989-04-01), Tanaka
patent: 5204779 (1993-04-01), Nakata et al.

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