Camera and robot system

A robot system comprising:

• a camera body which is attached to a tip of a robot;
• a camera unit comprising a plurality of camera devices that are different in optical characteristics for imaging a workpiece, the camera unit comprising one overhead camera and two close-range cameras mounted adjacent to each other in the same said camera body, wherein:
• the one overhead camera has a different working distance from the two close-range cameras,
• the one overhead camera and the two close-range cameras are adjacently arranged so that optical axes of the one overhead camera and the two close-range cameras are parallel with each other,
• the one overhead camera is located above a center of each of the two close-range cameras within the same plane of the camera body so that lines connecting the centers of the close-range camera and the one overhead camera form a triangle,
• the two close-range cameras are configured to calculate a distance from the camera body to the workpiece, and
• the two close-range cameras and the one overhead camera are actuated according to distance information to the workpiece calculated by the two close-range cameras, and when either the one overhead camera or the two close-range cameras is actuated, the other is turned off;
• and
• a controller which generates a control signal for controlling operation of the robot arm on the basis of imaging information acquired by the camera unit.