Patent ID: 7523524

Claim:
A wet treatment nozzle comprising: an ultrasonic cleaner comprising a first housing, a second housing, and a hollow portion between the first and second housing, an ultrasonic transducer placed on an interior bottom surface of the first housing, and a weight provided on the second housing; an introduction passage for introducing a treatment liquid on an exterior side of the ultrasonic cleaner; an exhaust passage which exhausts the treatment liquid on an other exterior side of the ultrasonic cleaner after a wet treatment of an object to be treated, the exhaust passage exhausting the treatment liquid that wet treated the object; wherein the ultrasonic cleaner includes a flow path along an exterior side of the second housing between the introduction passage and the exhaust passage that guides the treatment liquid to wet treat the object to be treated, such that the treatment liquid is exposed to atmosphere between the second housing and the object to be treated, wherein the weight minimizes propagation of energy from the ultrasonic transducer to a wall of the second housing by shifting the characteristic frequency of the wall of the second housing; and a pressure controller operable to maintain a difference between a pressure of the treatment liquid in contact with the object to be treated and an atmospheric pressure, so that the treatment liquid in contact with the object does not flow to the outside of the flow path.