The present invention discloses a charging device electrically connected to an external power supply and a rechargeable battery pack, so as to perform a charging procedure of the rechargeable battery pack. Since the shield member is connected to the grounding member, the circuit board remains connected to the ground thus preventing the apparatus from being statically charged. A stroboscopic device is equipped with this discharge tube. As at least one of the first threshold value judging part 19 and the second threshold value judging part 21 judges that it is a voice section, a voice section determining part 300 finally judges that it is a voice section and cuts out an input signal Saf which are in units of frames and corresponds to this voice section as a voice Svc which is to be recognized. A resistor has a first terminal connected to the loop and a second terminal connected to the ground. A jet aspiration pump is made of conductive polymeric material.