Patent ID: 9429767
Filing Date: 2016-08-30
CPC Classification: G02B

Claim Text:
1. An imaging optical system comprising: a front lens group including at least one front lens element, and a reflector element which reflects a light bundle that exits from said front lens element, in that order from the object side; and a rear lens group provided on the image side of said front lens group, wherein said front lens element serves as a spherically-swingable lens group which, in an image-stabilizing operation, suppresses image shake on the imaging plane by spherically-swinging said spherically-swingable lens group about a predetermined spherical-swing center in accordance with vibrations applied to said imaging optical system, and wherein the following conditions (1) and (2) are satisfied: and wherein νd designates the Abbe number with respect to the d-line of at least one lens element of said spherically-swingable lens group; f designates the focal length of said imaging optical system, in a state where the focal length is at a maximum; and y designates the maximum image height of the imaging plane.