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公开(公告)号：US20150191394A1
公开(公告)日：2015-07-09
申请号：US14661840
申请日：2015-03-18
Applicant: AvanStrate Inc. , HOYA CORPORATION
Inventor： Akihiro KOYAMA , Mikiko MORISHITA , Satoshi AMI , Kazuaki HASHIMOTO , Tetsuo TAKANO
Abstract: The disclosed cover glass is produced by etching a glass substrate that has been formed by a down-drawing process, and chemically strengthening the glass substrate to provide the glass substrate with a compressive-stress layer on the principal surfaces thereof. The glass substrate contains, as components thereof, 50% to 70% by mass of SiO2, 5% to 20% by mass of Al2O3, 6% to 30% by mass of Na2O, and 0% to less than 8% by mass of Li2O. The glass substrate may also contain 0% to 2.6% by mass of CaO, if necessary. The glass substrate has an etching characteristic in which the etching rate is at least 3.7 μm/minute in an etching environment having a temperature of 22° C. and containing hydrogen fluoride with a concentration of 10% by mass.
Abstract translation: 所公开的盖玻璃通过蚀刻通过下拉法形成的玻璃基板，并化学强化玻璃基板，以在玻璃基板的主表面上提供压应力层来制造。 玻璃基板作为其成分含有50〜70质量％的SiO 2，5〜20质量％的Al 2 O 3，6〜30质量％的Na 2 O，0〜8质量％ Li2O。 如果需要，玻璃基板也可以含有0〜2.6质量％的CaO。 玻璃基板具有蚀刻特性，其中在温度为22℃的蚀刻环境中蚀刻速率至少为3.7μm/分钟，并且含有浓度为10质量％的氟化氢。
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公开(公告)号：US20220277768A1
公开(公告)日：2022-09-01
申请号：US17629002
申请日：2020-07-22
Applicant: HOYA CORPORATION
Inventor： Koichi SATO , Kazuaki HASHIMOTO
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：US20240286946A1
公开(公告)日：2024-08-29
申请号：US18655216
申请日：2024-05-03
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 a mole ratio of the total content of Al2O3and MgO relative to the total content of SiO2 and CaO [(Al2O3+MgO)/(SiO2+CaO)] is in a range of 0.417 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, 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, the Na2O content is 0 mol %, and an average linear expansion coefficient of the glass at 100° C. to 300° C. is 68×10−7/° C. or less.
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公开(公告)号：US20240158281A1
公开(公告)日：2024-05-16
申请号：US18548890
申请日：2022-03-04
Applicant: HOYA CORPORATION
Inventor： Shuzo TOKUMITSU , Kazuaki HASHIMOTO
CPC classification number: C03C3/085 , C03C3/091 , C03C3/095 , G11B5/73921
Abstract: Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording/reproducing device, the glass being an amorphous glass that contains at least Li2O, in which a total content of Na2O and K2O is 0 mol % or more and 6.0 mol % or less, a B2O3 content is 0 mol % or more and 10.0 mol % or less, and a CaO content is 0 mol % or more and 1.0 mol % or less.
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5.发明申请GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, AND THEIR USE 有权用于磁记录介质基板的玻璃，用于磁记录介质的玻璃基板及其使用公开(公告)号：US20130343166A1
公开(公告)日：2013-12-26
申请号：US13839484
申请日：2013-03-15
Applicant: HOYA CORPORATION
Inventor： Naomi MATSUMOTO , Kazuaki HASHIMOTO
IPC: G11B5/73
CPC classification number: G11B5/7315 , G11B5/8404 , Y10T428/24355 , Y10T428/315
Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which comprises 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 CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20, and which has a glass transition temperature of equal to or higher than 650° 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CaO的含量与MgO，CaO，SrO和BaO（CaO /（MgO + CaO + SrO + BaO）的组合含量）的摩尔比等于或小于0.20，并且具有玻璃 转变温度等于或高于650℃
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Patent Agency Ranking
6.发明公开公开(公告)号：US20240208859A1
公开(公告)日：2024-06-27
申请号：US18557585
申请日：2022-05-02
Applicant: HOYA CORPORATION
Inventor： Masafumi MIURA , Kazuaki HASHIMOTO
IPC: C03C17/245 , G11B33/14
CPC classification number: C03C17/2453 , G11B33/1433 , C03C2217/211 , C03C2218/152 , C03C2218/365
Abstract: A method for producing a ring-shaped object includes: placing a ring-shaped substrate on a plate; and spraying a gas containing a coating raw material toward a center hole of the ring-shaped substrate from above the ring-shaped substrate placed on the plate to cause the ring-shaped substrate to float up from the plate and form a film on a surface of the ring-shaped substrate.
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7.发明公开公开(公告)号：US20240124346A1
公开(公告)日：2024-04-18
申请号：US18390144
申请日：2023-12-20
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 is an amorphous oxide glass. An SiO2 content ranges from 56 mol % to 80 mol %, an Li2O content is 2.00 mol % or less, a B2O3 content ranges from 0 mol % to 4 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, and a glass transition temperature of 650° C. or higher.
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公开(公告)号：US20220411317A1
公开(公告)日：2022-12-29
申请号：US17895029
申请日：2022-08-24
Applicant: HOYA CORPORATION
Inventor： Koichi SATO , Kazuaki HASHIMOTO
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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公开(公告)号：US20210387896A1
公开(公告)日：2021-12-16
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：US20250140290A1
公开(公告)日：2025-05-01
申请号：US19007105
申请日：2024-12-31
Applicant: HOYA CORPORATION
Inventor： Koichi SATO , Kazuaki HASHIMOTO
Abstract: In an amorphous glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording and reproducing apparatus, 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, a total content of Al2O3, MgO, and CaO (Al2O3+MgO+CaO) is 29.0 mol % or more and 36.50 mol % or less, the total content of SiO2, MgO, Li2O, Al2O3, and CaO (SiO2+MgO+Li2O+Al2O3+CaO) is 95.0 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, and 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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