发明授权
US5793578A Thin film induction recording head having an inset first insulation
layer that defines zero throat height and pole tip apex angle
失效
薄膜感应记录头具有插入的第一绝缘层,其限定零喉部高度和极尖顶角
- 专利标题: Thin film induction recording head having an inset first insulation layer that defines zero throat height and pole tip apex angle
- 专利标题(中): 薄膜感应记录头具有插入的第一绝缘层,其限定零喉部高度和极尖顶角
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申请号: US752012申请日: 1996-11-15
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公开(公告)号: US5793578A公开(公告)日: 1998-08-11
- 发明人: David Eugene Heim , Hugo Alberto Emilio Santini
- 申请人: David Eugene Heim , Hugo Alberto Emilio Santini
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G11B5/23
- IPC分类号: G11B5/23 ; G11B5/31 ; G11B5/33 ; G11B5/39 ; G11B5/47
摘要:
The present invention uncouples the dependence between the zero throat height and the flare point of a write head by recessing the first insulation layer within the first pole piece layer. The first pole piece layer and the first insulation layer have planar surfaces which preferably lie in a common plane, the zero throat height being defined at the point where the planar surface of the first pole piece layer first meets the planar surface of the first insulation layer within the head. It is also at this point that the first and second pole piece layers separate from one another. Accordingly, the zero throat height can be accurately placed relative to the stripe height of a magneto-resistive (MR) sensor. Further, when a photoresist layer is spun onto the partially completed head for the construction of the pole tip of the second pole piece light directed into the photoresist layer for photo-imaging the pole tip does not reflect into the photoresist layer adjacent the pole tip. Accordingly, there is substantially no reflective notching of the photoresist layer because of the flatness of the surfaces of the first pole piece layer and the first insulation layer thereby permitting construction of a well defined second pole tip.
公开/授权文献
- US5136937A Printing device 公开/授权日:1992-08-11
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