Zoom lens system with vibration reduction function

Details Zoom lens system with vibration reduction function Zoom lens system with vibration reduction function

1995-12-15

1997-06-24

Nguyen, Thong

Optical: systems and elements

Image stabilization

By movable refractive structure

359554, 359676, 359685, G02B 2764, G02B 1514

Patent

active

056422245

ABSTRACT:
A zoom lens system with vibration reduction function includes, in succession from the object side, a first lens unit having positive refractive power, a second lens unit movable along a direction across the optical axis thereof and having negative refractive power, a third lens unit, a fourth lens unit having positive refractive power, a fifth lens unit having negative refractive power, during the focal-length change from the wide angle end to the telephoto end, the spacing between the first lens unit and the second lens unit being increased, the spacing between the second lens unit and the third lens unit being varied, and the spacing between the fourth lens unit and the fifth lens unit being decreased, and a vibration reduction device for moving the second lens unit along the direction across the optical axis, the stabilization of an image on an image plane being accomplished by the movement of the second lens unit caused by the vibration reduction device.

REFERENCES:
patent: 4844602 (1989-07-01), Kitagishi et al.
patent: 4907868 (1990-03-01), Kitagishi et al.
patent: 4974950 (1990-12-01), Yamazaki et al.
patent: 5121978 (1992-06-01), Maruyama
patent: 5172276 (1992-12-01), Ueyama et al.
patent: 5325233 (1994-06-01), Nakatsuji et al.

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