Patent ID: 7422641

Claim:
A substrate cleaning apparatus cleaning a substrate held on a rotary base while rotating said substrate in a substantially horizontal plane, the apparatus comprising: a first discharge element substantially vertically discharging a first detergent liquid onto said substrate and forming a liquid film covering a prescribed region of a surface of said substrate by spreading a first detergent liquid in a peripheral edge direction due to rotational centrifugal force; a second discharge element discharging a cleaning mist formed by mixing a second detergent liquid and pressurized gas with each other onto said substrate provided with said liquid film thereon, said second discharge element including a detergent introduction pipe supplying said second detergent liquid, a gas introduction pipe supplying said pressurized gas, and a mixing part mixing said second detergent liquid supplied from said detergent introduction pipe and said pressurized gas supplied from said gas introduction pipe to form said cleaning mist; a moving element integrally moving both of said first and second discharge elements; a moving control element controlling said moving element so that said second discharge element is moved so that a reaching point of said cleaning mist on said substrate passes through a rotation center of said substrate, and said first and second discharge elements are moved horizontally with a prescribed distance from each other so that respective reaching points on said substrate associated with said first and second discharge elements are kept at least a prescribed distance from each other, and said cleaning mist reaches said prescribed region covered with said liquid film of said first detergent liquid, and a shielding element preventing said cleaning mist and said first detergent liquid from coming into contact with each other before reaching said substrate.