- 专利标题： Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device
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申请号： US10916439申请日： 2004-08-12
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公开(公告)号： US07035049B2公开(公告)日： 2006-04-25
- 发明人: Hiroki Yamamoto , Takashi Namekawa , Takashi Naito , Yasutaka Suzuki , Akira Kato , Noriyuki Takeo , Kiyoshi Akamatsu , Youichi Inomata , Masatomo Terakado , Ken Takahashi
- 申请人： Hiroki Yamamoto , Takashi Namekawa , Takashi Naito , Yasutaka Suzuki , Akira Kato , Noriyuki Takeo , Kiyoshi Akamatsu , Youichi Inomata , Masatomo Terakado , Ken Takahashi
- 申请人地址： JP Odawa
- 专利权人： Hitachi Global Storage Technologies Japan, Ltd.
- 当前专利权人： Hitachi Global Storage Technologies Japan, Ltd.
- 当前专利权人地址： JP Odawa
- 代理机构： Antonelli, Terry, Stout and Kraus, LLP.
- 优先权： JP9-198184 19970724
- 主分类号： G11B5/82
- IPC分类号： G11B5/82
摘要：
A glass substrate for a magnetic disk contains a transition metal. The substrate, which is subjected to formation of zone texturing by irradiating the substrate with a laser beam, has a high mechanical strength even if it is not chemically strengthened. The glass substrate contains a transition metal element and has a transmittance of 10% of less for light in a wavelength range of 300 to 2000 nm. The surface roughness of an information recording surface portion thereof is 2.0 nm or less. In addition to a transition metal element, the glass substrate may include a rare earth metal element.