Zoom lens system

Details Zoom lens system Zoom lens system

1992-04-01

1994-07-19

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514

Patent

active

053314646

ABSTRACT:
A zoom lens system comprises, in order from the object side, a negative first lens group N, a diaphragm stop A, a positive second lens group P and a blocking element B for blocking deleterious rays of light, with the first and second lens groups N and P movable for zooming, and with the diaphragm stop A moving independently of the second lens group P during zooming. The lens system satisfies the conditions 2.5<Xs/fs<3.0, 0<.DELTA.XA/fs<X2/fs, and 0.ltoreq..DELTA.XB/fs<.DELTA.X2/fs, where Xs is the distance from the diaphragm stop to the image plane at the wide-angle end, fs is the focal length of the overall system at the wide-angle end, .DELTA.XA is the range of movement of the diaphragm stop, and .DELTA.XB is the range of movement of the second lens group. This lens system has the diaphragm stop disposed in the appropriate position so that the compactness of lens barrel will not be impaired even if a motor is incorporated in it, and yet the system is capable of preventing the occurrence of deleterious flare rays of light.

REFERENCES:
patent: 4367927 (1983-01-01), Fujii
patent: 4662723 (1987-05-01), Imai
patent: 4730906 (1988-03-01), Okudaira
patent: 4909615 (1990-03-01), Ueda
patent: 5076677 (1991-12-01), Sato
patent: 5153777 (1992-10-01), Okada et al.

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