To provide the rust-proof and algae-proof and bacteria sterilization effects, by connecting electrically a first conductive plate of a first unit coil of a resonance coil with a receiving plate composed of a copper plate, and providing a resonance means for taking out the output from a third conductive plate through resistance by a conductive wire.

One end of a first spring-shaped unit coil 13 is connected electrically with an atom energy radiation side face 11a of a first conductive plate 11 while an annular conductor section 13e and a second conductive plate 15 are connected electrically with the other end to form a unit coil 1. Also one end of a second spring-shaped unit coil 17 is connected electrically with an atom energy radiation side face 15a of the second conductive plate 15, and the other end is connected electrically with the annular conductor section 17e and the third conductive plate 19. Also the first conductive plate 11 of the unit coil 1 is connected electrically with a receiving plate 21 by a conductive wire 25, and a resonance means 2b taking out the output from the third conductive plate 19 through resistance 23 by the conductive wire 25 is constituted.