Title:
A manufacturing method and a glass substrate for information recording media of a magnetic disk
Document Type and Number:
Japanese Patent JP5907259
Kind Code:
B2
Abstract:
The present invention provides a method for producing a magnetic disk, which is capable of forming a magnetic recording layer at high temperature. The present invention relates to a method for producing a magnetic disk, which comprises a step wherein a magnetic recording layer is formed on a glass substrate that is at a temperature of 550°C or more, and in which the glass substrate contains, in mol%, 60-75% of SiO2, 7-17% of Al2O3, 0% or more but less than 2% of B2O3, and one or more substances selected from among MgO, CaO, SrO and BaO in an amount of more than 18% but 26% or less in total, with the total of the above-mentioned seven components being 95% or more, while containing one or more substances selected from among Li2O, Na2O and K2O in an amount of less than 1% or not containing any of these three substances.
More Like This:
| WO/2022/030174 | GLASS AND CRYSTALLIZED GLASS |
| WO/2018/021279 | GLASS SHEET |
| WO/2020/264229 | GLASS-CERAMIC AND METHODS OF MAKING THE SAME |
Inventors:
Tetsuya Nakashima
Tomoyuki Tsujimura
Manabu Nishizawa
Akio Koike
Tomoyuki Tsujimura
Manabu Nishizawa
Akio Koike
Application Number:
JP2014519971A
Publication Date:
April 26, 2016
Filing Date:
May 31, 2013
Export Citation:
Assignee:
Asahi Glass Co., Ltd.
International Classes:
C03C3/085; C03C3/091; G11B5/73; G11B5/84
Domestic Patent References:
| JP9012333A | ||||
| JP10045422A |
Foreign References:
| WO2011136027A1 |
Attorney, Agent or Firm:
Patent business corporation glory patent office
Yuriko Hamada
Kenji Kitajima
Hironori Honda
Yuriko Hamada
Kenji Kitajima
Hironori Honda
Previous Patent: Two or more line amplifying device
Next Patent: A drive, electronic equipment, and a drive control program
Next Patent: A drive, electronic equipment, and a drive control program