Variable-magnification optical system capable of image stabiliza

Details Variable-magnification optical system capable of image stabiliza Variable-magnification optical system capable of image stabiliza

1994-11-09

1996-05-28

Nguyen, Viet Q.

Optical: systems and elements

Image stabilization

By movable refractive structure

359554, 359683, 359684, 359689, 359754, G02B 2700

Patent

active

055217583

ABSTRACT:
A variable magnification optical system comprises, from front to rear, a lens unit which is stationary during variation of the magnification and during focusing and a portion for varying the magnification. The lens unit comprises a fixed front lens sub-unit and a rear lens sub-unit which is arranged to tilt with its tilting center at a point on the optical axis to correct the image shake. At least one lens surface in the front lens sub-unit is formed to such an aspheric shape that a positive refractive power gets progressively stronger toward a marginal portion thereof. The following conditions are set forth:

REFERENCES:
patent: 2959088 (1960-11-01), Rantsch
patent: 4998809 (1991-03-01), Tsuji
patent: 5138492 (1992-08-01), Tsuji et al.
patent: 5221994 (1993-06-01), Nishio

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