Wide-angle lens with an image stabilizing function

Details Wide-angle lens with an image stabilizing function Wide-angle lens with an image stabilizing function

1998-01-20

1999-06-29

Sugarman, Scott J.

Optical: systems and elements

Lens

Reverse telephoto

359554, 359557, 359750, 359752, G02B 1304, G02B 2764

Patent

active

059176636

ABSTRACT:
A wide-angle lens with an image stabilizing function comprises, from a front, object side to a rear, image side, a lens group GF with negative refractive power; a lens group GL with positive refractive power, wherein the back focal length is longer than the focal length of the entire optical system and overall refractive power is positive and wherein a partial lens group GLP having positive refractive power out of the lens group GL comprises at least a positive meniscus lens with the convex surface facing the image side and a biconvex lens; and a displacement device provided to reduce vibration by causing rotative motion of the partial lens group GLP about a point on the optical axis on the object side which is separated by a predetermined distance from a surface of the partial lens group GLP closest to the image side, wherein the focal length fLP of the partial lens group GLP and the focal length f of the whole lens system at infinite objective distance satisfy 0.3<fLP/f<5.0. Accordingly, the present invention is capable of providing a compact, high performance wide-angle lens well suited for photographic and video uses.

REFERENCES:
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patent: 4978205 (1990-12-01), Sato
patent: 5069537 (1991-12-01), Kitagishi
patent: 5270857 (1993-12-01), Oizumi et al.
patent: 5387999 (1995-02-01), Hayashi
patent: 5557473 (1996-09-01), Sugiyama et al.
patent: 5731897 (1998-03-01), Suzuki
patent: 5774267 (1998-06-01), Kodama et al.

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