Patent ID: 8994839
Filing Date: 2015-03-31
Classification: G02B,G03B,H04N

Abstract:
1. A lens device to be mounted on an image capturing device body, the lens device comprising: a lens; a lens position detector for detecting a position of the lens; a lens driving part provided with an electric motor, the lens driving part transmitting driving force from the electric motor to the lens to allow the lens to move in an optical axis direction; a brake part for short-circuiting coils in the electric motor to stop the electric motor; a reception part for receiving a lens movement command, including a target position of the lens and brake ON/OFF information showing whether or not the brake part brakes at the target position, from the image capturing device body; a control part for allowing the lens to move to the target position via the lens driving part when the reception part receives the lens movement command; a determination part for determining whether or not the lens reached the target position on the basis of the target position and the detected lens position; and a transmission part for transmitting completion of the lens drive to the image capturing device body when the determination part determines that the lens reached the target position, and allowing the reception part to receive a subsequent lens movement command from the image capturing device body, wherein in an one-sided drive mode which allows the lens to move beyond a target position, and then to move in a reverse direction and stop at the target position, the control part controls the lens on the basis of the brake ON/OFF information so that when the lens is temporarily stopped, braking by the brake part is not applied, and only when the lens is stopped at a final target position, braking by the brake part is applied.