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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：US20240425403A1
公开(公告)日：2024-12-26
申请号：US18819335
申请日：2024-08-29
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
Abstract: A glass substrate includes a pair of main surfaces, and an outer circumferential edge surface. The outer circumferential edge surface has a circular shape. A plurality of portions each of which has a defect, a hole, or glass alteration and extends in a thickness direction of the glass substrate are intermittently formed on the outer circumferential edge surface 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：US20240327280A1
公开(公告)日：2024-10-03
申请号：US18574152
申请日：2022-07-05
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA , Toshio TAKIZAWA
CPC classification number: C03C23/0025 , C03C15/02 , C03C23/007 , C03C2203/52
Abstract: A method for manufacturing a glass substrate includes: flattening a to-be-scribed region extending along a predetermined to-be-scribed line on a surface of a glass blank by irradiating the surface of the glass blank with a first laser beam along the to-be-scribed line; and forming a scribe line along the to-be-scribed line by irradiating the flattened to-be-scribed region with a second laser beam.
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公开(公告)号：US20240101473A1
公开(公告)日：2024-03-28
申请号：US18276685
申请日：2022-01-28
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
CPC classification number: C03C23/0025 , C03C15/02 , G11B5/73921 , G11B5/8404
Abstract: A method for manufacturing a glass plate includes processing for irradiating an inner circumferential edge surface extending along an inner hole in an annular glass plate with a laser beam along the inner circumferential edge surface. When the inner circumferential edge surface is irradiated with the laser beam, the laser beam is concentrated by a condenser lens and formed into diffused light, and the inner circumferential edge surface is irradiated with the diffused light from a direction inclined with respect to a main surface of the glass plate.
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Patent Agency Ranking
公开(公告)号：US20220089479A1
公开(公告)日：2022-03-24
申请号：US17297973
申请日：2019-12-02
Applicant: HOYA CORPORATION
Inventor： Shuhei AZUMA
IPC: C03C23/00 , B23K26/073 , B23K26/354 , B23K26/352 , B23K26/00
Abstract: A method for manufacturing a disk-shaped glass plate in which shape processing is performed on an edge surface of the glass plate includes processing the edge surface into a target shape by irradiating the edge surface with a laser beam while moving the laser beam relative to the edge surface in a circumferential direction of the glass plate. A cross-sectional intensity distribution of the laser beam with which the edge surface is irradiated is a single mode, and W1>Th holds true and Pd×Th is in a range of 0.8 to 3.5 [W/mm] when a width of luminous flux of the laser beam in a thickness direction of the glass plate at an irradiation position of the edge surface is W1 [mm], a thickness of the glass plate is Th [mm], and a power density of the laser beam is Pd.
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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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