发明授权
- 专利标题： Method of detecting pinholes in a magnetic recording medium
- 专利标题（中）： 检测磁记录介质中针孔的方法
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申请号： US30538申请日： 1979-04-16
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公开(公告)号： US4273797A公开(公告)日： 1981-06-16
- 发明人: Goro Akashi , Yasuyuki Yamada , Masaaki Fujiyama , Nobutaka Yamaguchi
- 申请人： Goro Akashi , Yasuyuki Yamada , Masaaki Fujiyama , Nobutaka Yamaguchi
- 申请人地址： JPX Kanagawa
- 专利权人： Fuji Photo Film Co., Ltd.
- 当前专利权人： Fuji Photo Film Co., Ltd.
- 当前专利权人地址： JPX Kanagawa
- 优先权： JPX47/55476 19720602
- 主分类号： C09D177/00
- IPC分类号： C09D177/00 ; C09D127/06 ; C09D163/00 ; G11B5/708 ; G11B5/73 ; G11B5/735 ; B05D5/12
摘要：
A magnetic recording medium comprising a plastic film support having a magnetic recording layer on one side is provided with a backing layer containing: (1) a white and/or light colored powder; (2) carbon black and/or graphite; and (3) a polymeric binder. The backing layer transmits more than 3% of white light at a thickness of 2 microns and has a surface electrical resistance of less than 10.sup.10 .OMEGA./cm. Pinholes and drop-out are easily detected in forming such a magnetic recording medium.
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