Patent ID: 7697041
Filing Date: 2010-04-13
Classification: G02B

Abstract:
1. An optical apparatus comprising: a first moving lens group configured to be moveable along an optical axis to vary magnification; a second moving lens group configured to be moveable along the optical axis to adjust focusing; a position detection device configured to detect positions of the first and second moving lens groups; a first storage device configured to store cam trajectory information related to the position of the second moving lens group relative to the position of the first moving lens group; a control device configured to control the driving of the first and second moving lens groups; and a second storage device; wherein the cam trajectory information stored in the first storage device is information consisting of plural cam trajectories each corresponding to a distance from the subject; a first switch configured to instruct the control device to store two of the plural cam trajectories and internal division ratios between the two cam trajectories in the second storage device; and a second switch configured to instruct the control device to move the second moving lens to a focus position calculated based on a current zoom position and the two cam trajectories and the internal division ratios stored in the second storage device.