Patent ID: 8567417
Filing Date: 2013-10-29
Classification: B08B,H01L

Abstract:
1. An ultrasonic cleaning apparatus comprising: a cleaning tank configured to store a cleaning liquid; an object-to-be-processed holder that can be inserted into the cleaning tank, the object-to-be-processed holder being configured to hold an object to be processed and to immerse the object to be processed into the cleaning liquid; a vibrator disposed on a bottom part of the cleaning tank; an ultrasonic oscillator configured to make the vibrator ultrasonically vibrate; a driving apparatus configured to laterally move the object-to-be-processed holder; and a control device configured to control the ultrasonic oscillator and the driving apparatus; wherein the object-to-be-processed holder includes a first object-to-be-processed holding part and a second object-to-be-processed holding part which can be moved separately and laterally from each other; wherein each of the first object-to-be-processed holding part and the second object-to-be-processed holding part includes a first holding rod and a second holding rod, the second holding rod being in opposed arrangement to the first holding rod with respect to a vertical axis line passing a center of the object to be processed; the second holding rod of the first object-to-be-processed holding part is disposed between the first holding rod of the second object-to-be-processed holding part and the second holding rod of the second object-to-be-processed holding part; the second holding rod of the second object-to-be-processed holding part is disposed between the first holding rod of the first object-to-be-processed holding part and the second holding rod of the first object-to-be-processed holding part; wherein the first object-to-be-processed holding part and the second object-to-be-processed holding part can hold the object to be processed independently from each other; and the control device is configured to control the driving apparatus such that the first object-to-be-processed holding part and the second object-to-be-processed holding part of the object-to-be-processed holder are sequentially laterally moved, so that one of the first object to be processed holding part and the second object to be processed holding part is laterally moved with respect to the object to be processed held by the other, and the control device is configured to control the ultrasonic oscillator such that the vibrator is made to ultrasonically vibrate whereby the ultrasonic vibration from the vibrator is propagated to the object to be processed; wherein the control device is configured to control the driving apparatus such that, after the object to be processed held by the first object-to-be-processed holding part and the second object-to-be-processed holding part has been immersed into the cleaning liquid in the cleaning tank, the first object-to-be-processed holding part is moved from a first holding position at which the object to be processed is held, to a first lateral position located laterally to the first holding position and is then returned to the first holding position, and that the second object-to-be-processed holding part is moved from a second holding position at which the object to be processed is held, to a second lateral position located laterally to the second holding position and is then returned to the second holding position, and the control device is configured to control the ultrasonic oscillator such that the vibrator is made to ultrasonically vibrate when the first object-to-be-processed holding part is located at least at the first lateral position and when the second object-to-be-processed holding part is located at least at the second lateral position, whereby the ultrasonic vibration from the vibrator is propagated to areas of the object to be processed, the areas having been held by the first object-to-be-processed holding part and the second object-to-be-processed holding part.