Patent ID: 8047897
Filing Date: 2011-11-01
Classification: B24B

Abstract:
1. A substrate flat grinding device comprising: a grinding head including a grindstone spindle that is supported by hydrostatic pressure bearings and magnetic bearings for at least one of rotary and linear motion, wherein the grindstone spindle equips a cup wheel type grindstone; rotation/linear motion compound actuators that are adapted to cause the grindstone spindle to execute rotary/linear motion; a fastening plate that fastens the grinding head in a perpendicular direction to a central position of a lower surface of the fastening plate; a workpiece chuck rotary table mechanism having a rotary chuck table provided below the grinding head and parallel to the bottom surface of the grindstone, wherein the rotary table is supported by a hollow spindle supported by hydrostatic pressure bearings; and three fastening plate lifting-and-lowering mechanisms positioned at the vertices of an equilateral or isosceles triangle formed by the lower surface of the fastening plate on which the grindstone spindle is provided at a midpoint, the fastening plate lifting-and-lowering mechanisms each being adapted to independently raise and lower the fastening plate at each of the fastening plate lifting-and-lowering mechanisms.