Title:
GLASS SUBSTRATE AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2011/148845
Kind Code:
A1
Abstract:
Provided is a glass substrate which is used as a substrate for a thermally assisted magnetic recording medium, wherein a magnetic recording layer is a film which is formed on the glass substrate and then subjected to a post-heat treatment, and the recording layer satisfies Ts / Tg > 0.8 (formula 1) and ΔRMS < 0.1 Mpa (formula 2) when Ts is the maximum temperature reached by the glass substrate during the post-heat treatment, Tg is the glass transition temperature of the glass substrate, and ΔRMS is the amount of change in the deviation of the stress distribution over the entire surface of the glass substrate before the post-heat treatment and after the post-heat treatment of the magnetic recording layer.
Inventors:
ENDO, Takeshi (INC. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/061487
Publication Date:
December 01, 2011
Filing Date:
May 19, 2011
Export Citation:
Assignee:
KONICA MINOLTA OPTO, INC. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
International Classes:
G11B5/73; G11B5/84
Attorney, Agent or Firm:
Fukami Patent Office, p.c. (Nakanoshima Central Tower, 2-7 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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