Patent ID: 7364495
Filing Date: 2008-04-29
Classification: B24B,H01L

Abstract:
1. A wafer double-side polishing apparatus comprising: a carrier plate having wafer holding holes, a center of each wafer holding hole disposed along a first pitch circle having a first diameter; upper and lower turn tables to which polishing pads are attached; and a slurry supply means; wherein: with wafers held in the wafer holding holes, the carrier plate being moved between the upper and lower turn tables while supplying slurry, to simultaneously polish both front and back surfaces of wafers; the upper turn table further comprising a plurality of devices for fixing the upper turn table to support, the fixing devices load supporting points forming disposed along a second pitch circle having a second diameter equal to the first diameter, the load supporting points configured to receive and distribute applied force to the upper turn table; the lower turn table further comprising a plurality of bearing devices forming load supporting points disposed along a third pitch circle having a third diameter equal to the first diameter, the load supporting points configured to receive and distribute applied force to the lower turn table.