Ex parte IIZUKA - Page 4




          Appeal No. 97-3467                                                           
          Application 08/279,748                                                       




                    wherein there is the following relationship:                       
                         * =cos  { 2 cos" X cos  T - cos " }-1      2                                               
                         ( =tan  { sin" / ( 2cos" x sinT x cosT ) }-1                                                       
                         (* sin( - " ) < p/f                                           
                    wherein                                                            
                    "f" designates the focal length of the scanning optical            
                    system;                                                            
                    """ the incident angle of a drawing beam upon the reflecting       
                    surface of the deflecting mirror in a sub-scanning direction       
                    normal to said main scanning direction;                            
                    "T" the angle of a line normal to the reflecting                   
                    surface of the deflecting mirror with respect to                   
                    a bisector of the optical axis of the scanning                     
                    optical system and the axis of an incident beam;                   
                    "p" the pitch of the aligned drawing beams;                        
                    "*" the angle of the drawing beams reflected by                    
                    the reflecting surface of the deflecting mirror                    
                    with respect to the optical axis of the scanning                   
                    optical system; and,                                               
                    "(" the angle of a line connecting an image                        
                    forming point of the drawing beams reflected by                    
                    the reflecting surface on the drawing surface and                  
                    an intersecting point on the optical axis of the                   
                    scanning optical system to the drawing surface,                    
                    with respect to the sub-scanning direction.                        
                                       Opinion                                         
               We do not sustain the examiner’s rejection of claims 1-4 and            

                                           4                                           





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