Patent ID: 7551355
Filing Date: 2009-06-23
Classification: G02B

Abstract:
1. An imaging lens device comprising: a light path folding optical system, through which a light passes from an object side to an image side, having a reflector that folds an optical axis of the optical system and a shake correction lens group aligned in the optical axis after the optical axis is folded by the reflector; an imaging element for converting an image having passed through the optical system into an electrical signal; and drive means for driving the shake correction lens group in the direction perpendicular to the optical axis in order to perform a shake correction for an image moving in the direction perpendicular to the optical axis; wherein, the light path folding optical system comprises a plurality of lens groups along the optical axis where the lens groups are numbered from the object side to the image side, and the plurality of lens groups satisfy a conditional equation (1) 0.5<|(1−βa)×βb|<1.2, where βa is the magnification of the shake correction lens group and βb is the magnification of the lens group located next to the shake correction lens group closer to the imaging element.