Ultrasonic washing apparatus

An ultrasonic washing apparatus comprising:

• a rod horn for transmitting ultrasonic vibrations, the rod horn extending in a lengthwise direction and having a greatest dimension in said lengthwise direction, said rod horn having a center line extending in the lengthwise direction and the rod horn having an end face for irradiating ultrasonic vibrations at one end and an expanded portion attached to an ultrasonic vibrator at another end, the end face being angled relative to the center line of the rod horn,
• a case for covering the ultrasonic vibrator,
• a point of intersection of the center line of the rod horn and a center point of the end face of the rod horn being in a remote position from a first focusing point of ultrasonic waves emitted from the ultrasonic vibrator transmitted in the rod horn,
• an angle between the center line of the rod horn and the end face being in a range between 100 degrees to 170 degrees,
• a cable connected to the ultrasonic vibrator and drawn out from an end of the case,
• the end face of the rod horn being provided in parallel with a disk to be washed, and in a minute gap between the end face of the rod horn and the disk to be washed, washing liquid is applied from a side of the end face of the rod horn to the gap between the end face and the disk to be washed, and a surface of the disk is washed by the washing liquid and the ultrasonic waves.