| 摘要 |
PROBLEM TO BE SOLVED: To vibrate the dirt components in water and to substantially prevent the adhesion of dirt on a bathtub wall surface by installing an ultrasonic generator to the bathtub wall in tight contact therewith and enabling irradiation with ultrasonic waves to prevent the adhesion of dirt to a bathtub when bathtub water exists. SOLUTION: Electric power is supplied from an AC power source 4 through a supply cord 5 to an ultrasonic vibrator transducer 3 to vibrate the ultrasonic vibrator transducer 3 to irradiate the water with the ultrasonic waves. The ultrasonic waves with which the inside of the bathtub water stored in the bathtub 1 is irradiated vibrate the dirt components and the bathtub water and are capable of preventing the adhesion of the dirt on the bathtub. The frequencies of the ultrasonic waves cast from the ultrasonic vibrator transducer 3 are so designed that the bathtub wall resonates. Various modes are conceivable for the vibration of the bathtub wall and a thickness vibration is suitable in order to vibrate the dirt at a frequency above >=20 kHz known as the ultrasonic wave. When the bathtub wall is resonated in the manner described above, the efficient irradiation of the inside of the water with the lesser energy is possible.
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