Patent ID: 7603030
Filing Date: 2009-10-13
Classification: G02B

Abstract:
1. An optical apparatus comprising: a zoom optical system including a focusing lens unit; a first cam member that rotates around the optical axis and moves along the optical axis in a magnification-changing operation, the first cam member including a focus cam portion for driving the focusing lens unit; and a speed-changing mechanism that changes the relative rotational speed between the focusing lens unit and the first cam member in accordance with a change of the focal length of the zoom optical system in the magnification-changing operation, wherein all parts of the speed-changing mechanism move along the optical axis in the magnification-changing operation, and wherein the speed-changing mechanism includes a transmission member that is rotatable around the optical axis with respect to the first cam member and that includes a speed-changing cam portion for changing at least one of the rotational speed and the rotational direction of the focusing lens unit.