Ex parte VAN ENGELSHOVEN et al. - Page 7

          Appeal No. 1998-0335                                                        
          Application 08/518,061                                                      

          plates.  Matsuda is cited as teaching making the principal                  
          lens system electrode of an electron gun from a plurality of                
          laminated plates.  The examiner concludes that it would have                
          been obvious to the artisan to form the intermediate electrode              
          of Shimoma with a plurality of separate plates as taught by                 
          Matsuda [answer, pages 3-4].                                                
          Appellants argue that an intermediate electrode of                          
          Shimoma is constructed from a single, relatively thick plate                
          of constant cross section along its thickness while the                     
          laminated electrodes of Matsuda are principal lens electrodes,              
          rather than intermediate electrodes, and have a varying cross               
          section along their thickness.  Based on these differences,                 
          appellants assert that there is no possible motivation for                  
          replacing Shimoma’s single plate electrode with a plurality of              
          stacked identical plates [brief, pages 4-5].                                
          We agree with the conclusion of the examiner.  There                        
          is no question that Matsuda teaches that the focusing                       
          characteristics of a “principal” [abstract translation] lens                
          system electrode can be improved by using laminated thin                    
          plates.  This principal lens system is referred to as a “main”              
          lens system in the attached translation.  Therefore, the                    

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