Patent ID: 6487744
Filing Date: 2002-12-03
Classification: H01L

Abstract:
A device for cleaning a wafer of abrasive agent suspension (slurry) remaining after polishing with brushes and DI water, the device comprising:an upper gear casing having an upper side with an end, said upper gear casing being impervious to washing fluid; a motor disposed on said end and encapsulated in said upper gear casing; a drive shaft connected to said motor running perpendicular to said upper side; an upper gear mechanism encapsulated in said upper gear casing and connected to said drive shaft including an intermediate wheel having teeth turned by said drive shaft, an upper drive wheel having teeth intermeshed with and driven by said intermediate wheel, a shaft connected to said upper drive wheel, and a receiving plate for holding a brush connected to and driven by said upper drive wheel via said shaft, said receiving plate being disposed underneath said upper gear casing, parallel to said upper side; a coupling connected to said drive; a lower gear casing substantially mirroring said upper gear casing, said lower gear casing receiving said coupling, and said lower gear casing and said upper gear casing being fixed one above the other; and a lower gear mechanism encapsulated in said lower gear casing including an intermediate wheel having teeth rotated by said coupling, and a lower drive wheel having teeth intermeshed with and rotated by said intermediate wheel and connected via a shaft to a lower receiving plate for holding brushes, said lower receiving plate being coaxial with said upper receiving plate, said lower receiving plate and upper receiving plate forming a brush unit, between which a part of a wafer can be clamped and cleaned by rotating said brush unit; said lower gear mechanism turning said lower drive wheel in the same direction as said upper drive wheel.