Cleaning sheet for a probe

Abstract

A cleaning sheet has a base sheet, a first polishing layer formed on the base sheet, a porous foamed layer having air bubbles inside formed on the base sheet, and a second polishing layer formed on the foamed layer. The surface of the foamed layer may be flat or preferably porous with the second polishing layer having openings corresponding to those on the porous surface of the foamed layer. For cleaning a probe by using such a cleaning sheet, the tip of the probe is caused to penetrate the surface of the second polishing layer, to pass through the foamed layer and to be pressed against the first polishing layer.

1 . A cleaning sheet comprising: 
 a base sheet;    a first polishing layer formed on said base sheet;    a porous foamed layer formed on said base sheet, said foamed layer having air bubbles inside; and    a second polishing layer formed on said foamed layer.    
   
   
       2 . The cleaning sheet of  claim 1  wherein said porous foamed layer has a flat surface.  
   
   
       3 . The cleaning sheet of  claim 1  wherein said porous foamed layer has a porous surface.  
   
   
       4 . The cleaning sheet of  claim 3  wherein said second polishing layer has a surface with openings which correspond to openings on said porous surface of said foamed layer.  
   
   
       5 - 8 . (canceled)