Patent ID: 6409051
Filing Date: 2002-06-25
Classification: G01F

Abstract:
An apparatus for dispensing a liquid media, comprising:a rotating element having a cylindrical bore with a first end and a second end, the rotating element being disk shaped and configured to rotate the first end and the second end; a motorized device coupled to the rotating element; a housing having a fixed input port and a fixed output port, the housing being configured to enclose the rotating element, the first end and the second end of the rotating element being configured to intermittently switch between being aligned with the fixed input port and the fixed output port and being aligned with the fixed output port and the fixed input port, respectively; and a cylindrical piston contained within the cylindrical bore, the cylindrical piston having a length that is less than the cylindrical bore and is configured to switch from being closer to the fixed input port and the fixed output port; wherein the rotating element is configured to be rotated by the motorized device to provide a substantially continuous flow of the liquid media, and the apparatus is implemented for controllably dispensing the liquid media onto one of a wafer surface, a wafer scrub brush, and a CMP polishing pad.