Patent Number: 6,169,853

Title: Zooming optical system

Abstract: A zooming optical system is provided with a plurality of lens groups that are moved to change a focal length of the zooming optical system. One of the plurality of lens groups including an aperture member has constituted to have (I) a focusing lens group that is driven to move for focusing, and (II) a image-vibration compensation lens group that is driven to move for compensating trembling of image due to a hand-vibration applied to the zooming optical system. The aperture member does not move when the focusing lens group or the image-vibration compensation lens group is driven to move.

Inventors: Hasushita; Sachio (Saitama-ken, JP), Ito; Takayuki (Saitama-ken, JP)

Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha

International Classification: G02B 15/16 (20060101); G02B 7/10 (20060101); G03B 017/00 (); G02B 027/64 (); G02B 015/14 ()

Expiration Date: 01/02/2018