Optical: systems and elements – Image stabilization – By movable refractive structure
Patent
1994-12-27
1998-02-03
Nguyen, Thong
Optical: systems and elements
Image stabilization
By movable refractive structure
359554, 359676, 359690, G02B 2764, G02B 1514
Patent
active
057150877
ABSTRACT:
Disclosed is an image position correcting optical system, comprising, sequentially from an object side, a first lens group having positive refracting power and a second lens group having negative refracting power. The first lens group is fixed. The second lens group is so provided as to be movable along an optical axis. A part of lens subunits of lens elements constituting the first lens group is so provided as to be movable in a direction across the optical axis. A positive lens element of the lens elements constituting the first lens group satisfies the following conditions: ##EQU1## where n.sub.d is the refractive index with respect to the d-line, n.sub.F is the refractive index with respect to the F-line, n.sub.C is the refractive index with respect to the C-line, .nu..sub.d is the Abbe number with respect to the d-line, and .theta..sub.FCd is the partial dispersion ratio expressed by (n.sub.d -n.sub.C)/(n.sub.F -n.sub.C).
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Nguyen Thong
Nikon Corporation
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