发明公开
EP0389143A2 Thin film magnetic heads, their manufacture and magnetic information storage apparatus including them
失效
薄膜磁头，它们的制备方法和含有磁性信息存储装置这些头。
- 专利标题： Thin film magnetic heads, their manufacture and magnetic information storage apparatus including them
- 专利标题（中）： 薄膜磁头，它们的制备方法和含有磁性信息存储装置这些头。
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申请号： EP90302412.3申请日： 1990-03-07
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公开(公告)号： EP0389143A2公开(公告)日： 1990-09-26
- 发明人: Kawabe, Takashi , Fuyama, Moriaki , Narishige, Shinji , Ashida, Eizi , Morijiri, Makoto , Tanabe, Masanori , Fukui, Hiroshi , Sugita, Yutaka , Ikeda, Hiroshi , Hayashi, Masaaki , Nakagoshi, Kazuo , Kawakami, Kanji , Saitoh, Yukuo , Kuwatsuka, Shunichiro
- 申请人： HITACHI, LTD.
- 申请人地址： 6, Kanda Surugadai 4-chome Chiyoda-ku, Tokyo 101 JP
- 专利权人： HITACHI, LTD.
- 当前专利权人： HITACHI, LTD.
- 当前专利权人地址： 6, Kanda Surugadai 4-chome Chiyoda-ku, Tokyo 101 JP
- 代理机构： Paget, Hugh Charles Edward
- 优先权： JP66230/89 19890320
- 主分类号： G11B5/00
- IPC分类号： G11B5/00 ; G11B5/012 ; G11B5/31 ; G11B5/39
摘要：
A magnetic head for reading from and/or writing to a magnetic information storage medium, has a substrate (21) on which a plurality of thin films are formed in sequence. The films provide a magnetic circuit having a magnetic gap (25), a bottom pole piece (22) and a top pole piece (12,15) overlying said bottom pole piece. The top pole piece is formed as a tip portion (12) adjoining the magnetic gap and a rear portion (15) which makes magnetic contact with the tip portion (12). The rear portion (15) is formed in the sequence after the tip portion (12). To ensure accurate thickness and width of the tip portion (12), there is a non-magnetic protective film (13) on the tip portion (12) formed in the sequence after the tip portion (12) and before the rear portion (15).
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