发明授权
- 专利标题: Manufacturing method for a glass substrate for magnetic disk
- 专利标题(中): 磁盘用玻璃基板的制造方法
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申请号: US13313593申请日: 2011-12-07
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公开(公告)号: US08806895B2公开(公告)日: 2014-08-19
- 发明人: Shinji Eda , Hideki Isono , Akira Murakami
- 申请人: Shinji Eda , Hideki Isono , Akira Murakami
- 申请人地址: JP Tokyo
- 专利权人: Hoya Corporation
- 当前专利权人: Hoya Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Global IP Counselors, LLP
- 主分类号: C03B11/08
- IPC分类号: C03B11/08 ; C03B7/12 ; C03B7/11 ; C03B11/05 ; C03B11/12 ; C03C19/00 ; C03C21/00
摘要:
The present invention provides a manufacturing method of a sheet glass material excellent in flatness. A manufacturing method of glass substrate for magnetic disk including a pair of principal surfaces, the method comprising the steps of: dropping process for dropping a lump of molten glass; pressing process for forming a sheet glass material by performing press forming to the lump while sandwiching the lump from both sides of the dropping path of the lump with facing surfaces of a pair of dies, the pair of dies being set to substantially the same temperature; and processing process for processing the sheet glass material, while the lump drops down while revolving around its dropping axis.