Zoom lens system with function for reducing vibration

Details Zoom lens system with function for reducing vibration Zoom lens system with function for reducing vibration

1996-02-29

1997-07-29

Nguyen, Thong

Optical: systems and elements

Image stabilization

By movable refractive structure

359554, 359676, 359691, G02B 2764, G02B 1514

Patent

active

056526784

ABSTRACT:
A zoom lens with a function for reducing vibration, comprises in the order from an object side a first lens group having a negative refracting power and a second lens group movable in a direction traversing an optical axis and having a positive refracting power. When varying a focal length from a wide-angle end to a telephoto end, the first lens group moves non-linearly, and the second lens group moves toward the object side. The zoom lens also comprises a displacing device for reducing vibration by moving the second lens group in the direction traversing the optical axis. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 4907868 (1990-03-01), Kitagishi et al.
patent: 5000549 (1991-03-01), Yamazaki
patent: 5069537 (1991-12-01), Kitagishi
patent: 5168403 (1992-12-01), Umeda et al.
patent: 5182671 (1993-01-01), Kitagishi et al.
patent: 5270857 (1993-12-01), Oizumi et al.
patent: 5559635 (1996-09-01), Sato
"Photography Industry" vol. 49, No. 8 p. 551 (Aug. 1991).

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