Disclosed is a fuel cell system provided with a fuel cell, a water tank which stores water to be supplied to the fuel cell, and a heating device which defrosts the water inside the tank during activation of the fuel cell. At least a portion of each out-coupling region overlaps with at least a portion of the other. The matters adhering to the separation membrane is cleaned and removed by means of an ultrasonic wave emitted from the ultrasonic transducer transducer. The thread is formed on the surface of the shaft and spirally extends from the awl to the head. The apparatus also has a mode input switch for selecting and inputting the desired readout mode from among the three choices of readout-and-erase mode, readout only mode, and erase only mode, and a control means for controlling the readout means and the erasing means according to the mode that has been selected and input. The ON timing of the drive pulse is determined to be at a valve opening pressure achieving time before the start point of formation in time of the geometry.