Ex Parte MIYAGAWA et al - Page 5



               Appeal No. 2006-0386                                                                                              
               Application 09/460,222                                                                                            

               positions of the high-density disc and the high NA lens carried by the second optical                             
               head.3                                                                                                            
                      The optical discs are contained in respective cartridges 2.  Each cartridge has a                          
               disc thickness discrimination hole 7 whose open or closed states identifies the type (i.e.,                       
               thickness) of disc contained therein. The open or closed state is detected using a light                          
               emitting diode (LED) 8 and a photodiode 9.  A system controller 22 is responsive to the                           
               output of photodiode 9 to (a) use LD driving circuit 20 and selector switch 21 to activate                        
               the laser light source in the appropriate optical head and (b) use selector switch 10 to                          
               select the output signal from the appropriate photodetector.                                                      


                      Second embodiment – Figs. 5-6                                                                              
                      The second embodiment differs from the first by including both optical systems in                          
               a single optical head 30, as shown in detail in Figure 6.                                                         
                       Third embodiment – Figs. 7-8                                                                              



                                                                                                                                
                      3  Figures 4A and 4B have been amended by a certificate of correction in the                               
               Reissue Patent to designate the focal distance FD and the working distance WD.                                    





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