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    MAGNETIC-DISK SUBSTRATE AND MAGNETIC DISK
    2.
    发明申请
    MAGNETIC-DISK SUBSTRATE AND MAGNETIC DISK 有权

    公开(公告)号：US20210327464A1

    公开(公告)日：2021-10-21

    申请号：US17364730

    申请日：2021-06-30

    Applicant: Masanobu ITAYA ,  Kinobu OSAKABE ,  Toshio TAKIZAWA

    Inventor： Masanobu ITAYA ,  Kinobu OSAKABE ,  Toshio TAKIZAWA

    IPC: G11B5/82 ,  G11B5/73 ,  G11B5/667

    Abstract: A magnetic-disk substrate has an average value of squares of inclinations that is 0.0025 or less, and a frequency at which squares of inclinations are 0.004 or more is 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm. The main surface is configured to receive at least a magnetic recording layer thereon. The magnetic-disk substrate includes an outer circumferential end portion and an inner circumferential end portion, and the outer circumferential end portion and the inner circumferential end portion have chamfered portions.

    GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS
    4.
    发明申请
    GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS 有权
    用作信息记录介质的基板的玻璃，信息记录介质和信息记录介质的基板及其生产方法

    公开(公告)号：US20120328907A1

    公开(公告)日：2012-12-27

    申请号：US13605006

    申请日：2012-09-06

    Applicant: Kazuo TACHIWANA ,  Yoichi HACHITANI ,  Xuelu ZOU ,  Mikio IKENISHI ,  Kinobu OSAKABE

    Inventor： Kazuo TACHIWANA ,  Yoichi HACHITANI ,  Xuelu ZOU ,  Mikio IKENISHI ,  Kinobu OSAKABE

    IPC: G11B5/735 ,  G11B5/84 ,  G11B5/667

    CPC classification number: G11B5/735 ,  C03C3/083 ,  C03C3/087 ,  C03C3/095 ,  C03C3/097 ,  C03C15/00 ,  C03C19/00 ,  C03C21/002 ,  C03C23/0075 ,  G11B5/7315 ,  G11B5/82 ,  G11B5/8404 ,  Y10T428/24273 ,  Y10T428/315

    Abstract: According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO2 and Al2O3, where SiO2 content is equal to or greater than 50 percent and Al2O3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li2O, Na2O and K2O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO2, HfO2, Nb2O5, Ta2O5, La2O3 Y2O3 and TiO2; with the molar ratio of the total content of Li2O, Na2O and K2O to the total content of SiO2, Al2O3, ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3 and TiO2 ((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) being equal to or less than 0.28. Further provided are the substrate for information recording medium, information recording medium and their manufacturing methods according to the present invention.

    Abstract translation: 根据本发明的一个方面，提供了一种用于信息记录介质的基板的玻璃，其包括以摩尔百分数表示的总和为70〜85％的SiO 2和Al 2 O 3，其中SiO 2含量等于或大于 50％，Al2O3含量等于或大于3％; 总计等于或大于10％的Li2O，Na2O和K2O; CaO和MgO的总量为1〜6％，其中CaO含量大于MgO含量; 总共大于0％但等于或低于ZrO2，HfO2，Nb2O5，Ta2O5，La2O3 Y2O3和TiO2的4％; 其中Li2O，Na2O和K2O的总含量与SiO2，Al2O3，ZrO2，HfO2，Nb2O5，Ta2O5，La2O3，Y2O3和TiO2（（Li2O + Na2O + K2O）/（SiO2 + Al2O3 + ZrO 2 + HfO 2 + Nb 2 O 5 + Ta 2 O 5 + La 2 O 3 + Y 2 O 3 + TiO 2））等于或小于0.28。 还提供了根据本发明的用于信息记录介质的基板，信息记录介质及其制造方法。

    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME
    5.
    发明申请
    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME 有权
    用于磁盘的玻璃基板及其制造方法

    公开(公告)号：US20120135153A1

    公开(公告)日：2012-05-31

    申请号：US13349495

    申请日：2012-01-12

    Applicant: Kinobu OSAKABE ,  Hideki ISONO ,  Katsuyuki IWATA ,  Shinji EDA ,  Kenichiro TERADA

    Inventor： Kinobu OSAKABE ,  Hideki ISONO ,  Katsuyuki IWATA ,  Shinji EDA ,  Kenichiro TERADA

    IPC: B05D1/18

    CPC classification number: G11B5/7315 ,  C03C21/002 ,  G11B5/8404

    Abstract: A glass substrate for a magnetic disk of the invention is a disk-shaped glass substrate for a magnetic disk where the substrate has a main surface and end face and is subjected to chemical reinforcement treatment, and is characterized in that the penetration length in the uppermost-portion stress layer on the main surface is 49.1 μm or less, and that assuming that an angle between the main surface and compressive stress in the stress profile by a Babinet compensator method is θ, a value y of {12·t·ln(tan θ)+(49.1/t)} is the penetration length in the uppermost-portion stress layer or less.

    Abstract translation: 本发明的磁盘用玻璃基板是用于磁盘的盘状玻璃基板，其中基板具有主表面和端面并进行化学强化处理，其特征在于，最上面的穿透长度 主表面的应力层为49.1μm以下，假设通过Babinet补偿方法在应力分布中的主表面与压缩应力之间的角度为θ，则{12·t·ln （tan＆amp; t s）+（49.1 / t）}是最上部应力层的贯通长度以下。

    GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM, INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS
    8.
    发明申请
    GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM, INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS 有权
    用作信息记录介质的基板的玻璃，信息记录介质的基板，信息记录介质及其生产方法

    公开(公告)号：US20120021892A1

    公开(公告)日：2012-01-26

    申请号：US13244399

    申请日：2011-09-24

    Applicant: Kazuo TACHIWANA ,  Yoichi HACHITANI ,  Xuelu ZOU ,  Mikio IKENISHI ,  Kinobu OSAKABE

    Inventor： Kazuo TACHIWANA ,  Yoichi HACHITANI ,  Xuelu ZOU ,  Mikio IKENISHI ,  Kinobu OSAKABE

    IPC: C03C3/097 ,  C03C3/04 ,  C03C3/085 ,  C03C3/087 ,  C03C3/095

    CPC classification number: G11B5/735 ,  C03C3/083 ,  C03C3/087 ,  C03C3/095 ,  C03C3/097 ,  C03C15/00 ,  C03C19/00 ,  C03C21/002 ,  C03C23/0075 ,  G11B5/7315 ,  G11B5/82 ,  G11B5/8404 ,  Y10T428/24273 ,  Y10T428/315

    Abstract: According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO2 and Al2O3, where SiO2 content is equal to or greater than 50 percent and Al2O3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li2O, Na2O and K2O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO2, HfO2, Nb2O5, Ta2O5, La2O3 Y2O3 and TiO2; with the molar ratio of the total content of Li2O, Na2O and K2O to the total content of SiO2, Al2O3, ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3 and TiO2 ((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) being equal to or less than 0.28. Further provided are the substrate for information recording medium, information recording medium and their manufacturing methods according to the present invention.

    Abstract translation: 根据本发明的一个方面，提供了一种用于信息记录介质的基板的玻璃，其包括以摩尔百分数表示的总和为70〜85％的SiO 2和Al 2 O 3，其中SiO 2含量等于或大于 50％，Al2O3含量等于或大于3％; 总计等于或大于10％的Li2O，Na2O和K2O; CaO和MgO的总量为1〜6％，其中CaO含量大于MgO含量; 总共大于0％但等于或低于ZrO2，HfO2，Nb2O5，Ta2O5，La2O3 Y2O3和TiO2的4％; 其中Li2O，Na2O和K2O的总含量与SiO2，Al2O3，ZrO2，HfO2，Nb2O5，Ta2O5，La2O3，Y2O3和TiO2（（Li2O + Na2O + K2O）/（SiO2 + Al2O3 + ZrO 2 + HfO 2 + Nb 2 O 5 + Ta 2 O 5 + La 2 O 3 + Y 2 O 3 + TiO 2））等于或小于0.28。 还提供了根据本发明的用于信息记录介质的基板，信息记录介质及其制造方法。

    GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
    9.
    发明申请
    GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM 有权
    用于磁记录介质和磁记录介质的玻璃基板

    公开(公告)号：US20120107647A1

    公开(公告)日：2012-05-03

    申请号：US12941832

    申请日：2010-11-08

    Applicant: Naomi MATSUMOTO ,  Kinobu OSAKABE ,  Yoichi HACHITANI

    Inventor： Naomi MATSUMOTO ,  Kinobu OSAKABE ,  Yoichi HACHITANI

    IPC: G11B5/73 ,  C03C3/087 ,  C03C3/085 ,  C03C3/097 ,  C03C3/095

    CPC classification number: G11B5/7315 ,  C03C3/087 ,  C03C3/095 ,  C03C3/097

    Abstract: An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass comprising, denoted as molar percentages, 56 to 75 percent of SiO2, 1 to 11 percent of Al2O3, more than 0 percent but equal to or less than 4 percent of Li2O, equal to or more than 1 percent but less than 15 percent of Na2O, equal to or more than 0 percent but less than 3 percent of K2O, and substantially no BaO, with a total content of Li2O, Na2O, and K2O falling within a range of 6 to 15 percent, with a molar ratio (Li2O/Na2O) being less than 0.50, with a molar ratio {K2O/(Li2O+Na2O+K2O)} being equal to or less than 0.13, with a total content of MgO, CaO, and SrO falling within a range of 10 to 30 percent, with a total content of MgO and CaO falling within a range of 10 to 30 percent, with a molar ratio {(MgO+CaO)/(MgO+CaO+SrO)} being equal to or more than 0.86, with a total content of the above alkali metal oxides and alkaline earth metal oxides falling within a range of 20 to 40 percent, with a molar ratio {(MgO+CaO+Li2O)/(Li2O+Na2O+K2O+MgO+CaO+SrO)} being equal to or more than 0.50, with a total content of ZrO2, TiO2, Y2O3, La2O3, Gd2O3, Nb2O5, and Ta2O5 being more than 0 percent but equal to or less than 10 percent, and with a molar ratio {(ZrO2+TiO2+Y2O3+La2O3+Gd2O3+Nb2O5+Ta2O5)/Al2O3} being equal to or more than 0.40, as well as having a glass transition temperature of equal to or higher than 600° C., an average coefficient of linear expansion of equal to or higher than 70×10−7/° C. at 100 to 300° C., and a Young's modulus of equal to or higher than 80 GPa.

    Abstract translation: 本发明的一个方面涉及一种用于磁记录介质的玻璃基板，其由玻璃构成，其包括以摩尔百分率表示56至75％的SiO 2，1至11％的Al 2 O 3，大于0％但等于 或小于4％的Li 2 O，等于或大于1％但小于15％的Na 2 O，等于或大于0％但小于3％的K 2 O，并且基本上不含BaO，总含量为Li 2 O， Na 2 O和K 2 O的摩尔比（K 2 O /（Li 2 O + Na 2 O + K 2 O））等于或小于0.13，摩尔比（Li 2 O / Na 2 O）小于0.50，6〜15％ ，MgO，CaO和SrO的总含量在10〜30％的范围内，MgO和CaO的总含量在10〜30％的范围内，摩尔比{（MgO + CaO） /（MgO + CaO + SrO）}等于或大于0.86，上述碱金属氧化物和碱土金属氧化物的总含量在 20％〜40％的摩尔比（（MgO + CaO + Li 2 O）/（Li 2 O + Na 2 O + K 2 O + MgO + CaO + SrO））等于或大于0.50，ZrO 2的总含量， TiO 2，Y 2 O 3，La 2 O 3，Gd 2 O 3，Nb 2 O 5和Ta 2 O 5大于0％但等于或小于10％，摩尔比{（ZrO 2 + TiO 2 + Y 2 O 3 + La 2 O 3 + Gd 2 O 3 + Nb 2 O 5 + Ta 2 O 5）/ Al 2 O 3} 等于或大于0.40，玻璃化转变温度等于或高于600℃，平均线膨胀系数为70×10-7 /℃，100℃ 至300℃，杨氏模量等于或高于80GPa。

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