Patent ID: 6887127
Filing Date: 2005-05-03
Classification: B24B

Abstract:
1. A polishing apparatus, comprising: an upper wheel for pressing at least one workpiece to be polished; a lower wheel for supporting the at least one workpiece; displacement-detection means, joined to the upper wheel to move together therewith, for detecting relative displacement between the upper wheel and the lower wheel; a reference table arranged at a position opposing the displacement-detection means and internally connected to the lower wheel, the reference table providing a displacement-detection reference position; wherein the at least one workpiece is polished by a relative difference in speeds between the at least one workpiece and at least one of the lower wheel and the upper wheel; a substantially cylindrical wheel drive shaft coaxially fixed to the lower wheel, the lower wheel having a cylindrical shape; at least one carrier for holding the at least one workpiece; a carrier drive shaft, coaxially arranged in the substantially cylindrical wheel drive shaft, for driving the at least one carrier for rotation and revolution around the lower wheel; a transmission shaft, connected to the carrier drive shaft, for driving the carrier drive shaft; and a connection arm passing through a through-hole formed in the carrier drive shaft, wherein the lower wheel and the reference table are joined together through the connection arm, and the transmission shaft is rotatably mounted on an inner wall of the wheel drive shaft.