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公开(公告)号：US12211533B2
公开(公告)日：2025-01-28
申请号：US18323378
申请日：2023-05-24
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
Abstract: In an amorphous glass, an SiO2 content is in a range of 56 mol % or more. An MgO content is in a range of 15 mol % or more and 28 mol % or less. An Li2O content is in a range of 0.2 mol % or more. An Na2O content is in a range of 5 mol % or less. A total content of Al2O3, MgO, and CaO (Al2O3+MgO+CaO) is 36.50 mol % or less. The total content of SiO2, MgO, Li2O, Al2O3, and CaO (SiO2+MgO+Li2O+Al2O3+CaO) is 97.5 mol % or more. A mole ratio of the total content of SiO2 and MgO relative to the Li2O content [(SiO2+MgO)/Li2O] is 13 or more. A mole ratio of a CaO content relative to a total content of Al2O3 and MgO [CaO/(Al2O3+MgO)] is 0.10 or less.
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公开(公告)号：US12040003B2
公开(公告)日：2024-07-16
申请号：US18075606
申请日：2022-12-06
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
CPC classification number: G11B5/73921 , C03C3/085 , C03C3/087 , C03C3/091 , C23C14/16 , C23C14/35 , G11B5/658
Abstract: A glass for magnetic recording medium substrate is an amorphous oxide glass. In terms of mol %, SiO2 content ranges from 45 to 68%, Al2O3 from 5 to 20%, total content of SiO2 and Al2O3 60 to 80%, B2O3 from 0 to 5%, MgO from 3 to 28%, CaO from 0 to 18%, total content of BaO and SrO 0 to 2%, total content of alkali earth metal oxides from 12 to 30%, total content of alkali metal oxides from 3.5 to 15%, and at least one kind selected from the group made of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00%, a glass transition temperature ≥625° C., a Young's modulus ≥83 GPa, a specific gravity ≤2.85, and an average linear expansion coefficient at 100 to 300° C.≥48×10−7/° C.
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公开(公告)号：US11688424B2
公开(公告)日：2023-06-27
申请号：US17629002
申请日：2020-07-22
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
CPC classification number: G11B5/73921 , C03C3/087
Abstract: Provided is a glass for a magnetic recording medium substrate, which is an amorphous glass, in which an SiO2 content is in a range of 54 mol % or more and 62 mol % or less, an MgO content is in a range of 15 mol % or more and 28 mol % or less, an Li2O content is in a range of 0.2 mol % or more, and an Na2O content is in a range of 5 mol % or less.
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公开(公告)号：US20240321310A1
公开(公告)日：2024-09-26
申请号：US18732851
申请日：2024-06-04
Applicant: HOYA CORPORATION
Inventor： Koichi SATO , Kazuaki Hashimoto
CPC classification number: G11B5/73921 , C03C3/085 , C03C3/087 , C03C3/091 , C23C14/16 , C23C14/35 , G11B5/658
Abstract: A glass for magnetic recording medium substrate is an amorphous oxide glass. In terms of mol %, SiO2 content ranges from 45 to 68%, Al2O3 from 5 to 20%, total content of SiO2 and Al2O3 60 to 80%, B2O3 from 0 to 5%, MgO from 3 to 28%, CaO from 0 to 18%, total content of BaO and SrO 0 to 2%, total content of alkali earth metal oxides from 12 to 30%, total content of alkali metal oxides from 3.5 to 15%, and at least one kind selected from the group made of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00%, a glass transition temperature ≥625° C., a Young's modulus ≥83 GPa, a specific gravity ≤2.85, and an average linear expansion coefficient at 100 to 300° C.≥48×10−7/° C.
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公开(公告)号：US11884584B2
公开(公告)日：2024-01-30
申请号：US17895029
申请日：2022-08-24
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
CPC classification number: C03C3/091 , C03C3/078 , C03C3/083 , C03C3/087 , C03C3/093 , C03C3/095 , G11B5/73921
Abstract: A glass, which is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording and reproducing apparatus, is an amorphous oxide glass. An SiO2 content ranges from 56 mol % to 80 mol %, an Li2O content ranges from 1 mol % to 10 mol %, a B2O3 content ranges from 0 mol % to 4 mol %, a Na2O content is 0 mol %, a total content of MgO and CaO (MgO+CaO) ranges from 9 mol % to 40 mol %, and the oxide glass has a specific gravity of 2.75 g/cm3 or less, a glass transition temperature of 650° C. or higher, and a Young's modulus of 90 GPa or more.
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Patent Agency Ranking
公开(公告)号：US11551714B2
公开(公告)日：2023-01-10
申请号：US17357281
申请日：2021-06-24
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
Abstract: A glass for magnetic recording medium substrate is an amorphous oxide glass. In terms of mol %, SiO2 content ranges from 45 to 68%, Al2O3 from 5 to 20%, total content of SiO2 and Al2O3 60 to 80%, B2O3 from 0 to 5%, MgO from 3 to 28%, CaO from 0 to 18%, total content of BaO and SrO 0 to 2%, total content of alkali earth metal oxides from 12 to 30%, total content of alkali metal oxides from 3.5 to 15%, and at least one kind selected from the group made of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00%, a glass transition temperature ≥625° C., a Young's modulus ≥83 GPa, a specific gravity ≤2.85, and an average linear expansion coefficient at 100 to 300° C.≥48×10−7/° C.
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公开(公告)号：US11999652B2
公开(公告)日：2024-06-04
申请号：US17784528
申请日：2020-12-11
Applicant: HOYA CORPORATION
Inventor： Koichi Sato , Kazuaki Hashimoto
Abstract: Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording/reproducing apparatus, in which the total content of Li2O, Na2O, K2O, B2O3, and ZnO (Li2O+Na2O+K2O+B2O3+ZnO) is in a range of 0 mol % or more and 3 mol % or less, the mole ratio of the total content of Al2O3 and MgO relative to the total content of SiO2 and CaO [(Al2O3+MgO)/(SiO2+CaO)] is in a range of 0.30 or more and 0.6 or less, the total content of SiO2 and Al2O3 (SiO2+Al2O3) is in a range of 64 mol % or more and 85 mol % or less, and the total content of SiO2, Al2O3, MgO, and CaO (SiO2+Al2O3+MgO+CaO) is in a range of 87 mol % or more and 98 mol % or less.
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公开(公告)号：US09096463B2
公开(公告)日：2015-08-04
申请号：US14447199
申请日：2014-07-30
Applicant: HOYA Corporation
Inventor： Kazuaki Hashimoto , Yoshikazu Hirose
CPC classification number: C03C21/00 , C03B17/064 , C03C3/062 , C03C15/00 , C03C21/002 , C03C2203/10 , C03C2203/50 , Y10T428/315
Abstract: A glass substrate chemically strengthened, includes a primary surface that has a compressive stress layer formed in an uppermost surface layer thereof. The compressive stress layer is configured to enhance strength of the glass substrate due to a compressive stress generated in the compressive stress layer. The compressive layer consists of a layer of a potassium ion concentration equal to or less than 5000 parts per million (ppm).
Abstract translation: 化学强化的玻璃基板包括在其最上表层形成的压应力层的主表面。 压应力层被配置为由于在压应力层中产生的压应力而增强玻璃基板的强度。 压缩层由等于或小于5000ppm（ppm）的钾离子浓度的层组成。
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公开(公告)号：US09007878B2
公开(公告)日：2015-04-14
申请号：US14341142
申请日：2014-07-25
Applicant: Hoya Corporation
Inventor： Naomi Matsumoto , Kazuaki Hashimoto
IPC: G11B11/00 , G11B5/62 , G11B5/73 , C03C3/085 , C03C3/087 , C03C17/06 , C03C21/00 , G11B5/84 , G11B13/04 , G11B5/00
CPC classification number: G11B5/7315 , C03C3/085 , C03C3/087 , C03C17/06 , C03C21/00 , C03C21/002 , G11B5/73 , G11B5/8404 , G11B13/04 , G11B2005/0021
Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which includes essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO, wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80, and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.
Abstract translation: 本发明的一个方面涉及一种用于磁记录介质基板的玻璃，其包括SiO 2，Li 2 O，Na 2 O以及一种或多种选自MgO，CaO，SrO等的一种或多种碱土金属氧化物的主要成分， 和BaO，其中MgO的含量与MgO，CaO，SrO和BaO（MgO /（MgO + CaO + SrO + BaO）的组合含量）的摩尔比等于或大于0.80，并且具有 杨氏模量等于或大于80GPa，玻璃化转变温度等于或大于620℃。
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公开(公告)号：US20140334276A1
公开(公告)日：2014-11-13
申请号：US14341142
申请日：2014-07-25
Applicant: Hoya Corporation
Inventor： Naomi MATSUMOTO , Kazuaki Hashimoto
CPC classification number: G11B5/7315 , C03C3/085 , C03C3/087 , C03C17/06 , C03C21/00 , C03C21/002 , G11B5/73 , G11B5/8404 , G11B13/04 , G11B2005/0021
Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which includes essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO, wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80, and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.
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