Zoom lens equipped with the image stabilizing function

Details Zoom lens equipped with the image stabilizing function Zoom lens equipped with the image stabilizing function

1995-11-22

1996-11-26

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359774, 359554, 359557, G02B 2764

Patent

active

055791719

ABSTRACT:
A zoom lens having a four-unit lens construction with positive, negative, positive, and positive refractive powers. In an embodiment, the second lens unit is moved toward the image side during the magnification change from the wide angle end to the telephoto end, and the third lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization. The zoom lens satisfies the condition that .DELTA.Y=f.sub.4 /f.sub.3 .multidot..DELTA.S. In another embodiment, the first, third, and fourth lens units are moved toward the object side during the magnification change from the wide angle end to the telephoto end, and the second lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization. The zoom lens satisfies the condition that .DELTA.Y=(1-.beta..sub.2).multidot..beta..sub.34 .multidot..DELTA.S.

REFERENCES:
patent: 5040881 (1991-08-01), Tsuji
patent: 5121978 (1992-06-01), Maruyama
patent: 5249079 (1993-09-01), Umeda
patent: 5270857 (1993-12-01), Oizumi et al.

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