Clamping jig for glass substrate, buffer sheet, method for processing glass substrate, and glass substrate

Abstract

The present invention provides a method which can simultaneously grind inner peripheral edges and outer peripheral edges of a multiplicity of glass substrates used for magnetic storage media or the like. In order to chamfer the outer edges of the glass substrates g, a multiplicity of annular glass substrates g are firstly stacked with buffer sheets 5 interposed between the glass substrates to make a glass substrate block G. Then, a first plates 1, 1 of the above described clamping jig are applied to both sides of the glass substrate block G, and a first fastening tool 3 is inserted through center holes of the first plates 1, 1 and the glass substrate block G. Next, the glass substrate block G is clamped from an inside thereof for chamfering the outer edges with a grindstone 6.

1 . A clamping jig for holding a multiplicity of annular glass substrates with the annular glass substrates being stacked, comprising: 
 a first pair of plates, each plate of which is pressed against each side of a glass substrate block fabricated by stacking the multiplicity of glass substrates and each plate of which is provided with a fastening tool insertion hole at a center of the each plate;    a first fastening tool which is inserted through an inner hole of said glass substrate block, end portions of the first fastening tool being attached to the fastening tool insertion holes of said first plates;    a second pair of plates, each plate of which is disposed outside said first plate and each plate of which has an inner diameter smaller than an outer diameter of the first plate; and    a second fastening tool for fastening the second pair of plates at a portion outside said glass substrate block.    
   
   
       2 - 17 . (canceled)  
   
   
       18 . The clamping jig according to  claim 1 , wherein the outer edges of the glass substrates can be processed when the glass substrate block is clamped by said first plates and said first fastening tool from an inside of the block, and the inner edges of the glass substrates can be processed when the glass substrate block is clamped by said second fastening tool from an outside of the block in a state where said second plates are applied to the outside of said first plates.  
   
   
       19 . The clamping jig according to  claim 1 , wherein said first plates and said second plates are an annular plate.  
   
   
       20 . The clamping jig according to  claim 1 , wherein said first fastening tool is one, and said second fastening tools are provided in plural with being equally spaced apart in a circumferential direction of said second plate.