发明名称 |
Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device |
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% or 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.
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申请公布号 |
US2003202280(A1) |
申请公布日期 |
2003.10.30 |
申请号 |
US20030408444 |
申请日期 |
2003.04.08 |
申请人 |
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发明人 |
YAMAMOTO HIROKI;NAMEKAWA TAKASHI;NAITO TAKASHI;SUZUKI YASUTAKA;KATO AKIRA;TAKEO NORIYUKI;AKAMATSU KIYOSHI;INOMATA YOUICHI;TERAKADO MASATOMO;TAKAHASHI KEN |
分类号 |
G11B5/73;G11B5/82;G11B5/84;(IPC1-7):G11B5/82 |
主分类号 |
G11B5/73 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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