| 摘要 |
PURPOSE:To facilitate peeling off of scale of a bath heater, by oscillating a wall of a container to be inserted into the bath heater by an electrostrictive oscillator fixed on the wall of the container. CONSTITUTION:An electrostrictive oscillator 12, formed of lead titanate zirconate group porcelain in a platelike state, the surface and the back of which are fused together with silver electrodes 13 and polarized so as to indicate a thicknessward oscillation after formation through metalizing, presses its oscillation radiation side electrode surface against the inside of a wall of an oscillation container 10 and fixes it with a holding plate 14 and a threaded lever 15, through which the oscillator 12 performs a function making a part of the foregoing wall of the container 10 into an oscillation surface. A colpitts oscillation circuit constituted with a transistor Tr, a coil L, condensers C1, C2, a dry cell B which is made into a driving power source of the oscillation circuit and a switch S turning the oscillation circuit ON, OFF are held in a power source box. |
