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公开(公告)号：US20210230042A1
公开(公告)日：2021-07-29
申请号：US17263019
申请日：2019-07-26
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
Abstract: A method for manufacturing a glass substrate including an opening includes forming lines of inner and outer circumferential portions irradiated with a laser beam along substantially concentric circles in a surface of a glass blank, separating a portion on an inner side of the line of the outer circumferential portion of the glass blank and a portion on an outer side of the line of the outer circumferential portion from each other by heating the portion on the outer side of the line of the outer circumferential portion with radiant heat and separating a portion on an inner side of the line of the inner circumferential portion of the glass blank and a portion on an outer side of the line of the inner circumferential portion from each other by heating the portion on the outer side of the line of the inner circumferential portion with radiant heat.
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公开(公告)号：US20180174606A1
公开(公告)日：2018-06-21
申请号：US15579033
申请日：2016-09-30
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
Abstract: A magnetic-disk glass substrate containing an alkaline earth metal component as a glass composition includes an edge surface that is a mirror surface, and has a roughness percentage of 40% or more when a bearing ratio of a roughness cross-sectional area is 50% in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the edge surface obtained after the edge surface is etched by 2.5 μm is measured.
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公开(公告)号：US20240400435A1
公开(公告)日：2024-12-05
申请号：US18806499
申请日：2024-08-15
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
IPC: C03B33/02 , B23K26/0622 , B23K26/361 , B23K26/53 , B23K103/00 , C03B33/04 , C03B33/09 , C03B33/10 , C03C19/00
Abstract: A disk-shaped glass plate includes a pair of main surfaces, and an outer circumferential edge surface. A thickness of the glass plate is not larger than 0.6 mm. The outer circumferential edge surface has a circular shape. The outer circumferential edge surface includes a plurality of portions each of which has a blemish, melting, degradation, or alteration. The plurality of portions are formed such that a predetermined space is formed between adjacent portions of the plurality of portions along a circumferential direction. The outer circumferential edge surface has a roundness not larger than 15 μm.
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公开(公告)号：US20220298053A1
公开(公告)日：2022-09-22
申请号：US17636855
申请日：2020-08-20
Applicant: HOYA CORPORATION
Inventor： Toshio TAKIZAWA , Shuhei AZUMA
Abstract: Chamfering processing for chamfering an edge face of a disk-shaped glass plate includes a step of disposing the glass plate such that a portion of the glass plate is disposed in a heating space for heating the glass plate and the remaining portion is disposed outside the heating space; and a step of softening a portion of the edge face of the glass plate by irradiating a circumferential portion of the edge face with a laser beam outside the heating space while rotating the glass plate in one direction around the center of the glass plate, and heating the softened portion of the edge face that has reached the heating space through the rotation.
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公开(公告)号：US20220227654A1
公开(公告)日：2022-07-21
申请号：US17623056
申请日：2020-06-29
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
IPC: C03B33/08 , C03B23/02 , C03C23/00 , C03C17/00 , B23K26/354 , B23K26/352 , G11B5/73 , G11B5/84
Abstract: When a laser beam is used to perform shape processing on an edge surface of a disk-shaped glass plate, in order to suppress strain (retardation values) in the main surface of the glass plate, the disk-shaped glass plate is floated above a base, and the edge surface of the glass plate is processed into a target shape by irradiating the edge surface with the laser beam while contactlessly heating the glass plate in a state where the glass plate is floated, and moving the laser beam relative to the edge surface in the circumferential direction of the disk-shaped glass plate.
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Patent Agency Ranking
公开(公告)号：US20160372147A1
公开(公告)日：2016-12-22
申请号：US15122377
申请日：2015-03-31
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
CPC classification number: G11B5/7315 , B24B1/00 , B24B9/107 , B24B31/112 , C03C15/00 , C03C21/002 , C03C2214/08 , G11B5/82
Abstract: An edge surface of a magnetic-disk glass substrate containing an alkali metal component as a glass composition is a mirror surface, and in a bearing ratio curve of roughness cross-sectional areas obtained by measuring a surface roughness of the edge surface obtained by etching the edge surface by 2.5 μm, a roughness percentage when a bearing ratio of a roughness cross-sectional area is 50% is 40% or more.
Abstract translation: 含有作为玻璃组合物的碱金属成分的磁盘玻璃基板的边缘表面是镜面，并且在通过测量通过蚀刻所获得的边缘表面的表面粗糙度而获得的粗糙度横截面积的轴承比曲线 边缘表面为2.5μm时，粗糙度横截面积的轴承比为50％时的粗糙度为40％以上。
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7.发明公开公开(公告)号：US20240233764A9
公开(公告)日：2024-07-11
申请号：US18547572
申请日：2022-02-24
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA , Toshio TAKIZAWA
CPC classification number: G11B5/73921 , G11B5/82 , G11B5/84
Abstract: A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 μm or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.
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公开(公告)号：US20240109807A1
公开(公告)日：2024-04-04
申请号：US18537768
申请日：2023-12-12
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
IPC: C03C23/00 , B23K26/352 , B23K26/354 , C03B29/02 , G11B5/73 , G11B5/84
CPC classification number: C03C23/0025 , B23K26/354 , B23K26/3576 , C03B29/025 , G11B5/73921 , G11B5/8404 , B23K2103/54
Abstract: An annular glass plate has an outer circumferential edge surface, an inner circumferential edge surface, and a thickness not larger than 0.6 mm. The outer circumferential edge surface and the inner circumferential edge surface are constituted by molten surfaces. The molten surfaces in the outer circumferential edge surface and the inner circumferential edge surface each have an arithmetic average surface roughness Ra not larger than 0.1 μm and the surface roughness of the molten surface in the inner circumferential edge surface is larger than the surface roughness of the molten surface in the outer circumferential edge surface. The molten surfaces in the inner circumferential edge surface and the outer circumferential edge surface do not bulge relative to both main surfaces of the annular glass plate.
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公开(公告)号：US20240018031A1
公开(公告)日：2024-01-18
申请号：US18254369
申请日：2021-11-25
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
CPC classification number: C03B33/082 , C03C17/002 , B23K26/0006 , B23K26/354 , B24B7/241 , G11B5/84 , C03C2218/31
Abstract: In a method for manufacturing a glass plate that includes chamfering processing for chamfering an edge surface of a glass plate, the chamfering processing includes a step of forming a chamfered surface by irradiating the edge surface of the glass plate with a laser beam, and a step of heating the glass plate before the chamfered surface is formed. When a temperature of the glass blank at which the glass blank is heated is Tp [° C.], a glass transition point of the glass blank is Tg [° C.], and an average coefficient of linear thermal expansion of the glass blank is α [1/° C.], (Tg−Tp)≤−5.67×107·α+840 is satisfied.
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公开(公告)号：US20230147153A1
公开(公告)日：2023-05-11
申请号：US17915440
申请日：2021-03-24
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
CPC classification number: C03B33/091 , C03B32/00 , C03B33/07
Abstract: A method for producing an intermediate glass plate includes a defect formation step, a separation step, and a polishing step. In the defect formation step, a defect is formed on main surfaces of glass blanks by irradiating a laminate of the glass blanks with a laser beam from one side in a lamination direction in which the glass blanks are laminated, along the lamination direction, and moving the laser beam relative to the laminate such that a circle is drawn in a view from the main surfaces of the glass blanks. In the separation step, a cylindrical laminate is formed by separating a removal target portion along the defect while maintaining the laminate. In the polishing step, a side wall surface of the laminate is polished while maintaining the cylindrical laminate so as to obtain a disk-shaped intermediate glass plate that has been subjected to edge surface polishing.
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