Sughrue, Mion, Zinn, Macpeak, and Seas
Magnetic recording medium
 A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided on opposite surfaces a magnetic recording layer and a backing layer containing two types of carbon black and a binder and having a thickness of 2 .mu.m or less, one of said carbon black being fine carbon black having an average particle size of 30 to 100 m.mu. and the other of said carbon black being coarse carbon black having an average particle size of 150 to 500 m.mu., and the mixing weight ratio of said carbon black and the binder being 1:1.5 to 1:3.5. 
Fuji Photo Film Co., Ltd.
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inventional additional additional additional additional inventional additional
Toshimitu Minoru Takahito Masaaki Kenichi Masahiro
Okutu Kanazawa Miyoshi Fujiyama Masuyama Utumi