| 摘要 |
An ultrasonic cleaning apparatus has an ultrasonic vibrator mounted in a cleaning tank on a bottom thereof for radiating ultrasonic energy, and a deaerated cleaning solution stored in the cleaning tank and having a surface level at a position substantially corresponding to an integral multiple of half the wavelength of the ultrasonic energy radiated by the ultrasonic vibrator. A web-shaped or filamentary elongate metal workpiece, which is shaped to pass the ultrasonic energy easily therethrough, is horizontally moved in the cleaning solution at a position spaced from the surface level by a distance substantially equal to a quarter of the wavelength of the ultrasonic energy radiated by the ultrasonic vibrator. An electrode, which is shaped to pass the ultrasonic energy easily therethrough, is disposed in the cleaning solution and extending parallel to the workpiece. A voltage is applied between the electrode and the workpiece while the workpiece is being moved in the cleaning solution.
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