Patent ID: 6835119
Filing Date: 2004-12-28
Classification: B24B

Abstract:
A lapping apparatus for lapping a workpiece, the apparatus comprising:an epicyclic-gear-shaped carrier capable of holding several workpieces; a sun gear arranged to mesh with the carrier; a ring gear arranged to mesh with the carrier; lap surface plates arranged at the upper portion and the lower portion of the carrier, respectively; an electric motor for driving the carrier and which rotates at least one of the sun gear and the ring gear; a low torque motor; a high torque motor; a low torque drive circuit arranged to perform an intermittent driving of at least one of the sun gear and the ring gear via the low torque motor; a high torque drive circuit arranged to perform a continuous driving of at least one of the sun gear and the ring gear via the high torque motor after the intermittent driving is finished; and a switch arranged to switch operation between the low torque drive circuit and the high torque drive circuit.