Patent ID: 6482290
Filing Date: 2002-11-19
Classification: B24B

Abstract:
A sweeping slurry dispenser in a chemical mechanical polishing apparatus comprising:a drive wheel of shape that turns on a fixed center axis, said wheel first having a first diameter and a second diameter perpendicular to each other, said first diameter being at least 50% larger than said second diameter; a dispenser wheel of circular shape that turns on a fixed center axis when driven by a push arm with a first end pivotally engaging a shaft on an outer mounted periphery of the dispenser wheel; a push arm of elongated shape having a hollow center slot therein for engaging a guide pin fixedly attached to said CMP apparatus, a first end pivotally attached to said outer periphery of the dispenser wheel and a distal second end equipped with a roller for rollingly engaging an outer surface of said oval shaped drive wheel, said push arm further equipped with a spring attached between said guide pin and said shaft on said dispenser wheel to facilitate the turning of the dispenser wheel; a motor means for rotating said drive wheel on said fixed center axis at a preset rotational speed; and a slurry dispensing nozzle attached to a bottom surface of said drive wheel for dispensing a slurry solution in an arcuate path when said dispenser wheel is turned by said drive wheel.