GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS
专利「GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS」由 HOYA CORPORATION 持有，当前状态为已注册，申请号 P/857。LaoBiz 老商通提供老挝知识产权信息检索与企业关联查询。
Patent “GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS” is held by HOYA CORPORATION; status: 已注册. Search Laos IP records on LaoBiz.
P/857
图样
基础信息
- 类型
- 专利
- 申请号
P/857- 状态
- 已注册
- 申请人
- HOYA CORPORATION
- 代理机构
- Tilleke & Gibbins International Ltd
- 申请日期
- 2022-10-12
- 注册号
P/857- 公开/公告日
- 2025-12-19
- 注册/授权日
- 2025-04-22
- 届满日
- 2042-10-12
- 国际分类
- C03C 3/085 · C03C 3/087 · C03C 3/091 · G11B 5/73
- 商品 / 服务
- —
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关联分析
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摘要
Provided is a glass for magnetic recording rnedium substrate, which is an amorphous oxide glass, wherein, in terms of mol7o, an SiOz content ranges from 45 to 680/o; an AlzOr content ranges from 5 to 20o/o; a total content of SiOz and AlzOl ranges from 60 to 80o/r; a BzO: content ranges from 0 to 5o/o; an MgO content ranges from 3 to 28o/o; a CaO content ranges from 0 to I8%o; a total content of BaO and SrO ranges from 0 to 2o/o; a total content of alkali earth metal oxides ranges from 12 to 30o/o; a total content of alkali metal oxides ranges fi'om 3.5 to l5o/o; and at least one kind selected fi'orn the group consisting of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00Yo, a glass transition temperature is equal to or higher than 625"C; a Young's modulus is equal to or more than 83 GPa; a specific gravity is equal to or less than 2.85; and an average linear expansion coeffrcient at 100 to 300oC is equal to or more than 48x l0'7 P
Provided is a glass for magnetic recording rnedium substrate, which is an amorphous oxide glass, wherein, in terms of mol7o, an SiOz content ranges from 45 to 680/o; an AlzOr content ranges from 5 to 20o/o; a total content of SiOz and AlzOl ranges from 60 to 80o/r; a BzO: content ranges from 0 to 5o/o; an MgO content ranges from 3 to 28o/o; a CaO content ranges from 0 to I8%o; a total content of BaO and SrO ranges from 0 to 2o/o; a total content of alkali earth metal oxides ranges from 12 to 30o/o; a total content of alkali metal oxides ranges fi'om 3.5 to l5o/o; and at least one kind selected fi'orn the group consisting of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00Yo, a glass transition temperature is equal to or higher than 625"C; a Young's modulus is equal to or more than 83 GPa; a specific gravity is equal to or less than 2.85; and an average linear expansion coeffrcient at 100 to 300oC is equal to or more than 48x l0'7 P