Method of manufacturing magnetic recording medium

Abstract

A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are effectively recorded by a magnetic transfer method with high quality. The method includes a slitting step for cutting an original sheet into discrete webs; a punching step for obtaining a disc-shaped slave medium; a thermo step for removing distortion; a burnishing step for smoothing a surface of the slave medium; a center core attachment step; a magnetic transfer step for performing a magnetic transfer while a master medium is allowed to be brought into close contact with one of the web and the slave medium; an assembly step for incorporating slave medium into the case; a cleaning step for cleaning a surface of the slave medium; a verifying step for checking the servo signals; and a packing step.

1 . A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are recorded by a magnetic transfer method, comprising the steps of: 
 cutting an original sheet into discrete webs each having a predetermined width (slitting step);    punching the web to obtain a disc-shaped slave medium (punching step);    removing distortion of one of the web and the slave medium (thermo step);    smoothing a surface of the slave medium (burnishing step);    fixedly attaching a center core to the slave medium (center core attachment step);    performing a magnetic transfer in a state where a master medium bearing servo information and one of the web and the slave medium are allowed to be brought into close contact with each other (magnetic transfer step);    incorporating the slave medium into the case (assembly step);    removing dust on the slave medium incorporated into the case (cleaning step);    checking the servo signals magnetically transferred to the slave medium (verifying step); and    packing the magnetic recording medium as a product (packing step).    
     
     
         2 . (Cancelled).  
     
     
         3 . A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are recorded by a magnetic transfer method, comprising the steps of: 
 cutting an original sheet into discrete webs each having a predetermined width (slitting step);    punching the web to obtain a disc-shaped slave medium (punching step);    removing distortion of the web (thermo step);    smoothing a surface of the slave medium (burnishing step);    performing a magnetic transfer in a state where the slave medium and a master medium bearing servo information are allowed to be brought into close contact with each other (magnetic transfer step);    fixedly attaching a center core to the slave medium (center core attachment step);    incorporating the slave medium into the case (assembly step);    removing dust on the slave medium incorporated into the case (cleaning step);    checking the servo signals magnetically transferred to the slave medium (verifying step); and    packing the magnetic recording medium as a product (packing step).    
     
     
         4 . A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are recorded by a magnetic transfer method, comprising the steps of: 
 cutting an original sheet into discrete webs each having a predetermined width (slitting step);    punching the web to obtain a disc-shaped slave medium (punching step);    removing distortion of the web (thermo step);    fixedly attaching a center core to the slave medium (center core attachment step);    performing a magnetic transfer in a state where the slave medium and a master medium bearing servo information are allowed to be brought into close contact with each other (magnetic transfer step);    smoothing a surface of the slave medium (burnishing step);    incorporating the slave medium into the case (assembly step);    removing dust on the slave medium incorporated into the case (cleaning step);    checking the servo signals magnetically transferred to the slave medium (verifying step); and    packing the magnetic recording medium as a product (packing step).    
     
     
         5 . A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are recorded by a magnetic transfer method, comprising the steps of: 
 cutting an original sheet into discrete webs each having a predetermined width (slitting step);    punching the web to obtain a disc-shaped slave medium (punching step);    removing distortion of the web (thermo step);    performing a magnetic transfer in a state where the slave medium and a master medium bearing servo information are allowed to be brought into close contact with each other (magnetic transfer step);    smoothing a surface of the slave medium (burnishing step);    fixedly attaching a center core to the slave medium (center core attachment step);    incorporating the slave medium into the case (assembly step);    removing dust on the slave medium incorporated into the case (cleaning step);    checking the servo signals magnetically transferred to the slave medium (verifying step); and    packing the magnetic recording medium as a product (packing step).    
     
     
         6 . A method of manufacturing a magnetic recording medium having a disc-shaped flexible slave medium accommodated in a case, onto which servo signals are recorded by a magnetic transfer method, comprising the steps of: 
 cutting an original sheet into discrete webs each having a predetermined width (slitting step);    removing distortion of the web (thermo step);    performing a magnetic transfer in a state where the web and a master medium bearing servo information are allowed to be brought into close contact with each other (magnetic transfer step);    punching the web to obtain a disc-shaped slave medium (punching step);    smoothing a surface of the slave medium (burnishing step);    fixedly attaching a center core to the slave medium (center core attachment step);    incorporating the slave medium into the case (assembly step);    removing dust on the slave medium incorporated into the case (cleaning step);    checking the servo signals magnetically transferred to the slave medium (verifying step); and    packing the magnetic recording medium as a product (packing step).