Lens system and image taking apparatus

摘要

A lens system 1 is provided with: a first lens unit 5 that is movable in the direction of the optical axis x; a second lens unit 12 that is movable in the direction of the optical axis x; a driving mechanism 9 that linearly moves the first lens unit 5 in the direction of the optical axis x; and a cylindrical cam shaft 13 having at least a first cam portion 13 a and a second cam portion 13 b. In the cylindrical cam shaft 13, the first cam portion 13 a is engaged with the first lens unit 5, and the second cam portion 13 b is engaged with the second lens unit 12. The cylindrical cam shaft 13 is rotated by the linear movement of the first lens unit 5 by the first driving mechanism 9, and the second lens unit 12 is linearly moved by the rotation of the cylindrical cam shaft 13.