Patent ID: 7095566
Filing Date: 2006-08-22
Classification: G02B

Abstract:
1. A drive controller for a lens apparatus including a first lens unit movable to change magnification and a second lens unit moving to prevent an image plane variation in response to the first lens unit moving to change the magnification, the drive controller comprising: a memory storing a plurality of tracking data corresponding to position data of the second lens unit; and a control unit detecting a change in a focus state of the lens apparatus during the movement of the first lens unit and changing at least one of the plurality of tracking data based on the detection, wherein the control unit performs a first control of storing a direction of the changing of the at least one of the plurality of tracking data and thereafter changing the at least one of the plurality of tracking data based on the stored direction, wherein, in the first control, the control unit changes the at least one of the plurality of tracking data in the stored direction responsive to the focus state changing towards an in-focus state, and wherein, in the first control, the control unit changes the at least one of the plurality of tracking data in a direction opposite to the stored direction responsive to the focus state changing towards an out-of-focus state.