Sughrue, Mion, Zinn, Macpeak & Seas
Magnetic recording medium
 A magnetic recording medium comprising a magnetic layer on one surface of a non-magnetic base and a back coating on the other surface thereof which is not thicker than 2.mu. and which contains inorganic particles and a binder is disclosed. The inorganic particles have an average size between 0.02 and 5.mu. and a Mohs hardness of 2.5 to 9.0, and the surface of the back coating has a center line average roughness (Ra) of 0.024 or less and the surface of the magnetic layer has a center line average roughness (Ra) of 0.02. 
Fuji Photo Film Co., Ltd.
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Takahito Masaaki Goro Tatsuji Toshimitu
Miyoshi Fujiyama Akashi Kitamoto Okutu