Non-Magnetic Substrate For Magnetic Disk, And Magnetic Disk
专利「Non-Magnetic Substrate For Magnetic Disk, And Magnetic Disk」由 HOYA CORPORATION 持有，当前状态为已注册，申请号 P/855。LaoBiz 老商通提供老挝知识产权信息检索与企业关联查询。
Patent “Non-Magnetic Substrate For Magnetic Disk, And Magnetic Disk” is held by HOYA CORPORATION; status: 已注册. Search Laos IP records on LaoBiz.
P/855
图样
基础信息
- 类型
- 专利
- 申请号
P/855- 状态
- 已注册
- 申请人
- HOYA CORPORATION
- 代理机构
- Tilleke & Gibbins Lao Co., Ltd
- 申请日期
- 2018-04-02
- 注册号
P/855- 公开/公告日
- 2026-01-23
- 注册/授权日
- 2025-04-22
- 届满日
- 2038-04-02
- 国际分类
- G11B 5/73 · G11B 5/738 · G11B 5/84
- 商品 / 服务
- —
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关联分析
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摘要
A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, the substrate main body made of glass or aluminum alloy, and a metal film that is formed on the main surfaces and an outer circumferential edge surface of the substrate main body and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness g1+D) of 0.700 mm or less, the thickness (t+O) being the sum of a thickness T of the substoate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the zubstrate main body is 0.025 or more. The outer circumferential edge surface of the substrate main body forming an interface with the metal film has a surface roughness maximum height Rz of 0.5 um or more.
A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, the substrate main body made of glass or aluminum alloy, and a metal film that is formed on the main surfaces and an outer circumferential edge surface of the substrate main body and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness g1+D) of 0.700 mm or less, the thickness (t+O) being the sum of a thickness T of the substoate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the zubstrate main body is 0.025 or more. The outer circumferential edge surface of the substrate main body forming an interface with the metal film has a surface roughness maximum height Rz of 0.5 um or more.