Optical: systems and elements – Image stabilization – By movable refractive structure
Patent
1997-05-30
1998-10-27
Nguyen, Thong
Optical: systems and elements
Image stabilization
By movable refractive structure
359784, 359554, G02B 2764, G02B 912
Patent
active
058284907
ABSTRACT:
An image position correcting optical system is provided with a compact and light image-position correction lens group while maintaining excellent optical performance. The image position correcting optical system includes a first lens group G.sub.1 that is fixed with respect to a direction perpendicular to an optical axis, a second lens group G.sub.2 that can be shifted in the direction perpendicular to the optical axis to correct an image position, and a third lens group G.sub.3 that is fixed with respect to the direction perpendicular to the optical axis. The first through third lens groups G.sub.1 -G.sub.3 are positioned in this order from an object side of the system. The second lens group G.sub.2 consists of a positive lens and a negative lens. The third lens group G.sub.3 includes at least one positive lens and at least one negative lens. The image position correcting optical system satisfies the condition -0.1.ltoreq..vertline.d.vertline./f3.ltoreq.0.4 when d is a distance between a back focal position of the second lens group G.sub.2 and a front principal point of the third lens group G.sub.3 and f3 is a focal length of the third lens group G.sub.3.
REFERENCES:
patent: 5579171 (1996-11-01), Suzuki et al.
patent: 5585966 (1996-12-01), Suzuki
Nguyen Thong
Nikon Corporation
Robinson Mark A.
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