Image stabilizing zoom lens

Details Image stabilizing zoom lens Image stabilizing zoom lens

2006-10-24

2006-10-24

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S554000, C359S557000

Reexamination Certificate

active

07126760

ABSTRACT:
A zoom lens includes, a first lens unit (1) having a positive refractive power and is fixed with respect to an image plane; a second lens unit (2) having a negative refractive power and causing a variable power action when moved along an optical axis; an aperture stop (6) fixed with respect to the image plane; a third lens unit (3) having a positive refractive power and fixed with respect to the optical axis direction when zooming and when focusing; a fourth lens unit (4) having a negative refractive power and fixed with respect to the image plane; and a fifth lens unit (5) having a positive refractive power and moveable along the optical axis such that the image plane, which is displaced by a movement of the second lens unit along the optical axis and by a movement of the object, is maintained at a constant position from a reference plane. The entire third lens unit is moveable in a direction perpendicular to the optical axis. A condition, 0.035<|βw·βt/Z|<0.075, is satisfied, where βw: magnification ratio of the second lens unit at the wide-angle end; βt: magnification ratio of the second lens unit at the telephoto end; and Z: zoom ratio.

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