发明授权
- 专利标题: Magnetic disk unit and manufacturing method of carriage structure thereof
- 专利标题(中): 磁盘单元及其托架结构的制造方法
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申请号: US713994申请日: 1991-06-12
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公开(公告)号: US5301078A公开(公告)日: 1994-04-05
- 发明人: Toshiaki Makino , Marutomo Goto , Hideyuki Kimura , Takashi Yamaguchi , Hiromu Hirai , Takashi Kono , Ryoji Okada , Toshihiro Yamada , Yasuhiro Yoshimura , Hideaki Amano , Akio Takatsuka , Toshio Matsushita , Satoru Yamaura , Yuichi Koizumi
- 申请人: Toshiaki Makino , Marutomo Goto , Hideyuki Kimura , Takashi Yamaguchi , Hiromu Hirai , Takashi Kono , Ryoji Okada , Toshihiro Yamada , Yasuhiro Yoshimura , Hideaki Amano , Akio Takatsuka , Toshio Matsushita , Satoru Yamaura , Yuichi Koizumi
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-155138 19900615; JPX2-254712 19900925; JPX2-295342 19901102
- 主分类号: G11B5/48
- IPC分类号: G11B5/48 ; G11B21/16
摘要:
A magnetic disk unit comprising a one-piece carriage structure having a small thermal off-tracking amount, with the carriage structure including a rotary shaft; guide arms integrally supported on a guide-arm retainer at their proximal ends and extending independently and parallely; bearing retainers formed on both ends of the guide-arm retainer; and bearings fixed on the bearing retainers rotatably connecting the guide-arm retainer to the rotary shaft. A center line in a direction of thickness of the outermost guide arm is located outside of that of the bearing in a direction of height thereof, and a concave portion is continuously formed on the bearing retainer. Thermal coefficients of expansion of the guide arms and the guide-arm retainer are substantially equal, with the carriage structure being fashioned of an alloy mainly containing Al and Si, eutectic crystal Si particles in the guide arm and/or the guide-arm retainer. The average value of the longest eutectic crystal Si particles therein is 1.6 .mu.m or less or the number of the eutectic crystal Si particles if 5.0 or more per 100 .mu.m.sup.2. In the carriage of manufacturing the carriage of the carriage structure is heated for five to fifteen hours at a temperature of 300.degree. to 500.degree. C. after die casting.