发明授权
- 专利标题： Magnetic head having first and second protective films with different coefficients of linear expansion
- 专利标题（中）： 磁头具有不同线性膨胀系数的第一和第二保护膜
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申请号： US11415572申请日： 2006-05-01
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公开(公告)号： US07460335B2公开(公告)日： 2008-12-02
- 发明人: Yohji Maruyama , Tadayuki Iwakura , Takashi Kawabe , Makoto Morijiri , Hiroshi Fukui
- 申请人： Yohji Maruyama , Tadayuki Iwakura , Takashi Kawabe , Makoto Morijiri , Hiroshi Fukui
- 申请人地址： JP Odawara
- 专利权人： Hitachi Global Technologies Japan, Ltd.
- 当前专利权人： Hitachi Global Technologies Japan, Ltd.
- 当前专利权人地址： JP Odawara
- 代理机构： Townsend and Townsend and Crew LLP
- 优先权： JP2002-355786 20021206
- 主分类号： G11B5/60
- IPC分类号： G11B5/60
摘要：
A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.
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