The purpose of the present invention is to provide a laminated polyester film which has excellent translucency and excellent suppression of an iris-like pattern, i. Rotation in the opposite direction is prevented through the engagement of the latch member with the protruding profile. A first rotatable connector on the connection member includes a plurality of first conductors. The time being received is controlled by a first arbitration logic and a second arbitration logic. The tracking system detects the movement of the measuring instrument on the reference surface in two orthogonal directions. When there is not sufficient power output from the natural energy power supply, the AC power supply and the load are connected so that the object of uninterruptedly driving the load to work when the natural energy power supply stops working is achieved and the reliability of the natural energy power supply is improved.