System and Method for Polishing Glass

Abstract

A system for polishing a glass includes a lower unit capable of rotating a glass placed at a fixed position, an upper unit capable of contacting with the glass and being passively rotated due to the rotation of the glass, and a moving unit for moving the upper unit in a horizontal and/or vertical direction. The upper unit includes a fixed platter fixed to a spindle of the upper unit, a polishing platter installed movably with respect to the fixed platter, and a pressing member interposed between the fixed platter and the polishing platter so as to keep the uniformity of pressure applied from the polishing platter to the glass.

1 . A system for polishing a glass, comprising:
 a lower unit capable of rotating a glass placed at a fixed position;   an upper unit capable of contacting with the glass and being passively rotated due to the rotation of the glass; and   a moving unit for moving the upper unit in a horizontal and/or vertical direction,   wherein the upper unit includes:   a fixed platter fixed to a spindle of the upper unit;   a polishing platter installed movably with respect to the fixed platter; and   a pressing member interposed between the fixed platter and the polishing platter so as to keep the uniformity of pressure applied from the polishing platter to the glass.   
     
     
         2 . The system for polishing a glass according to  claim 1 ,
 wherein the pressing member includes a plurality of air springs installed between the fixed platter and the polishing platter.   
     
     
         3 . The system for polishing a glass according to  claim 2 ,
 wherein the air springs include at least one air spring group concentrically arranged based on the spindle.   
     
     
         4 . The system for polishing a glass according to  claim 3 ,
 wherein every air spring included in the same air spring group is kept at the same pressure.   
     
     
         5 . The system for polishing a glass according to  claim 2 ,
 wherein a pressure applied to each of the air springs is adjustable.   
     
     
         6 . The system for polishing a glass according to  claim 2 ,
 wherein each of the air springs includes a bellows with an air inlet so as to suck in an air supplied through the fixed platter.   
     
     
         7 . The system for polishing a glass according to  claim 1 , further comprising:
 a plurality of guide members installed between the fixed platter and the polishing platter so as to guide the movement of the polishing platter with respect to the fixed platter.   
     
     
         8 . The system for polishing a glass according to  claim 7 ,
 wherein each of the guide members includes:   a guide shaft installed to the polishing platter through the fixed platter; and   a guide stopper installed at the other end of the guide shaft.   
     
     
         9 . The system for polishing a glass according to  claim 1 , further comprising:
 a polishing slurry supply unit for supplying a polishing slurry to the glass through the upper unit.   
     
     
         10 . The system for polishing a glass according to  claim 9 ,
 wherein the polishing slurry supply unit includes a plurality of polishing slurry supply paths installed through the fixed platter and the polishing platter.   
     
     
         11 . The system for polishing a glass according to  claim 10 ,
 wherein each of the polishing slurry supply paths includes:   a first path connecting a polishing slurry supply part of the polishing slurry supply unit to a top of the fixed platter; and   a second path connecting a bottom of the fixed platter to a top surface of the polishing platter and having an extendable structure.   
     
     
         12 . The system for polishing a glass according to  claim 11 ,
 wherein the second path includes:   a first connection pipe installed at a lower surface of the fixed platter; and   a second connection pipe installed at an upper surface of the polishing platter and sealably connected to the first connection pipe to be relatively movable with the first connection pipe.   
     
     
         13 . A method for polishing a glass, in which a polishing slurry is supplied between an upper unit and a glass to be polished while moving the upper unit in a horizontal direction and at the same time making the upper unit be passively rotated by contacting the upper unit to the glass placed at a fixed position on a lower unit and rotated by a lower unit, wherein the method comprising:
 (a) keeping pressures applied to the glass at a plurality of points of the upper unit substantially uniformly.   
     
     
         14 . The method for polishing a glass according to  claim 13 ,
 wherein, in the step (a), the pressures at a plurality of points are kept by means of a plurality of air springs, which configure at least one air spring group circularly arranged based on a spindle of the moving unit.   
     
     
         15 . The method for polishing a glass according to  claim 14 ,
 wherein every air spring included in the same air spring group is kept at the same pressure.   
     
     
         16 . The method for polishing a glass according to  claim 13 ,
 wherein a pressure applied to each of the air springs is adjustable.   
     
     
         17 . The method for polishing a glass according to  claim 13 ,
 wherein the polishing slurry is supplied through a plurality of polishing slurry supply paths concentrically arranged through the upper unit.