Patent ID: 11964309
Assignee: SEMES CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 11:
12. A substrate treatment apparatus comprising:
a first bath storing a cleaning solution and having a first opening formed in an upper surface thereof;
a first ultrasonic oscillator installed in the first bath and providing ultrasonic waves of a first frequency toward a surface of the cleaning solution exposed by the first opening to form a first water film protruding from the surface of the cleaning solution;
a second bath located on a side of the first bath, storing a cleaning solution, and having a second opening formed in an upper surface thereof;
a second ultrasonic oscillator installed in the second bath and providing ultrasonic waves of a second frequency greater than the first frequency toward a surface of the cleaning solution exposed by the second opening to form a second water film protruding from the surface of the cleaning solution;
a gas supply unit configured to supply gas to the substrate, the gas supply unit comprising a cylindrical body and a plurality of gas outlets formed in a side surface of the body, wherein each of the gas outlets extends in a longitudinal direction of the body,
wherein as a substrate wound in a roll shape is unwound, the substrate sequentially passes above the first bath and above the second bath without being immersed in the first bath and the second bath, a surface of the substrate is cleaned by the first water film and the second water film as the surface of the substrate passes near the first opening and the second opening, and the first bath comprises a first sidewall not facing the second bath and a second sidewall facing the second bath, wherein a second height of the second sidewall is higher than a first height of the first sidewall, and
the gas supply unit is disposed above the first bath, and the substrate is disposed between the first bath and the gas supply unit such that the other surface of the substrate faces the gas supply unit, to prevent contamination of the other surface of the substrate by supplying gas to the other surface of the substrate.