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公开(公告)号：US11682425B2
公开(公告)日：2023-06-20
申请号：US17315109
申请日：2021-05-07
Applicant: HOYA CORPORATION
Inventor： Shinji Eda , Kinobu Osakabe , Yoshitake Tanno , Mikio Ikenishi
CPC classification number: G11B17/021 , G11B17/038 , G11B25/043 , G11B33/1493 , G11B5/73921 , G11B17/32 , G11B33/125
Abstract: A ring-shaped glass spacer is configured to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A surface resistivity of a surface of a glass material of the glass spacer at 22 (° C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (° C.).
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公开(公告)号：US12190923B2
公开(公告)日：2025-01-07
申请号：US18321166
申请日：2023-05-22
Applicant: HOYA CORPORATION
Inventor： Kinobu Osakabe
IPC: G11B5/73
Abstract: A substrate for a magnetic disk includes a substrate main body having two main surfaces and an outer circumferential edge surface, and a film that is an alloy film containing Ni and P and provided on a surface of the substrate main body. A disk shape of the substrate main body has an outer diameter of 90 mm or more. A thickness T of the substrate that includes film thicknesses of sections of the film provided on the main surfaces is 0.520 mm or less. A total thickness D mm, which is a sum of the film thicknesses of the sections of the film on the main surfaces and the thickness T mm satisfy D≥0.0082/T−0.0015. A surface roughness maximum height Rz of the film provided on the outer circumferential edge surface is smaller than that of the substrate main body at the outer circumferential edge surface.
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公开(公告)号：US11694718B2
公开(公告)日：2023-07-04
申请号：US17472567
申请日：2021-09-10
Applicant: HOYA CORPORATION
Inventor： Kinobu Osakabe
IPC: G11B5/73
CPC classification number: G11B5/73921 , G11B5/739 , G11B5/73911 , G11B5/73917 , G11B5/73919
Abstract: A substrate for a magnetic disk includes a substrate main body having two main surfaces and an outer circumferential edge surface that has a side wall surface and chamfered surfaces, and a film that is an alloy film containing Ni and P and provided on a surface of the substrate main body. A disk shape of the substrate main body has an outer diameter of 90 mm or more. A thickness T of the substrate that includes the film provided on the main surfaces is 0.520 mm or less. A total thickness D mm of the film on the main surfaces and the thickness T mm satisfy D≥0.0082/T−0.0015. A film thickness of the film on the outer circumferential edge surface is larger than a film thickness of the film on the main surfaces, and is 150% or less of the film thickness of the film on the main surfaces.
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公开(公告)号：US11094345B2
公开(公告)日：2021-08-17
申请号：US16395850
申请日：2019-04-26
Applicant: HOYA CORPORATION
Inventor： Masanobu Itaya , Kinobu Osakabe
Abstract: A magnetic-disk substrate has a pair of main surfaces, and an arithmetic average roughness Ra of each of the main surfaces is 0.11 nm or less. The arithmetic average roughness Ra is a value obtained through measurement using an atomic force microscope provided with a probe having a probe tip provided with a carbon nanofiber rod-shaped member. The magnetic-disk substrate is made of glass or aluminum alloy.
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公开(公告)号：US11545178B2
公开(公告)日：2023-01-03
申请号：US17315145
申请日：2021-05-07
Applicant: HOYA CORPORATION
Inventor： Kinobu Osakabe
Abstract: A non magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces and being a glass substrate main body or an aluminum alloy substrate main body, and a metal film made of an Ni—P alloy and provided on the main surfaces and an outer circumferential edge surface of the substrate main body. The non magnetic substrate has a thickness (T+D) of 0.57 mm or less, which is the sum of a thickness T of the substrate main body and a thickness D of the metal film. The non magnetic substrate has a diameter of 90 mm or more. A ratio D/T is 0.025 or more. The outer circumferential edge surface of the substrate main body forming an interface with the metal film has a surface roughness maximum height Rz of 0.5 μm or more.
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Patent Agency Ranking
公开(公告)号：US11081134B2
公开(公告)日：2021-08-03
申请号：US16368046
申请日：2019-03-28
Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
Inventor： Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
Abstract: A hard disk drive includes a magnetic-disk substrate in which an average value of squares of inclinations 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.
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公开(公告)号：US11031036B2
公开(公告)日：2021-06-08
申请号：US16499200
申请日：2018-04-02
Applicant: HOYA CORPORATION
Inventor： Kinobu Osakabe
Abstract: A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, and a metal film that is provided on the main surfaces and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness (T+D) of 0.700 mm or less, the thickness (T+D) being the sum of a thickness T of the substrate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the substrate main body is 0.025 or more.
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公开(公告)号：US09607647B2
公开(公告)日：2017-03-28
申请号：US14432184
申请日：2013-09-30
Applicant: HOYA CORPORATION
Inventor： Masanobu Itaya , Kinobu Osakabe
IPC: G11B5/73
CPC classification number: G11B5/7315 , C23C14/35 , G11B5/73
Abstract: A magnetic-disk glass substrate of the present invention has a pair of main surfaces, and an arithmetic mean roughness (Ra) for wavelength components of 10 to 50 nm of the surface of the main surfaces is 0.15 nm or less.
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公开(公告)号：US11955151B2
公开(公告)日：2024-04-09
申请号：US18079849
申请日：2022-12-12
Applicant: HOYA CORPORATION
Inventor： Kinobu Osakabe
CPC classification number: G11B5/73917 , G11B5/73915 , G11B5/73919 , G11B5/73921 , G11B5/82
Abstract: A substrate for a magnetic disk includes a substrate main body having a disk shape and an alloy film. The substrate has a thickness (T+D) of 0.520 mm or less, which is the sum of a thickness T of the substrate main body and a thickness D of the film formed on main surfaces of the substrate main body. The disk shape has an outer diameter of 90 mm or more. A ratio D/T of the thickness D to the thickness T is 0.025 or more. The thickness of the film formed on an outer circumferential edge surface of the substrate main body is greater than the thickness of the film formed on each of the main surfaces, and the thickness of the film formed on each of the main surfaces is 80% or more of the thickness of the film formed on the outer circumferential edge surface.
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公开(公告)号：US11682424B2
公开(公告)日：2023-06-20
申请号：US17385787
申请日：2021-07-26
Applicant: HOYA CORPORATION
Inventor： Masanobu Itaya , Kinobu Osakabe
CPC classification number: G11B5/82 , G11B5/73913 , G11B5/73919 , G11B5/73921 , G11B5/84 , G11B5/8404 , B82Y10/00 , B82Y40/00
Abstract: A magnetic-disk substrate has a pair of main surfaces, and an arithmetic average roughness Ra of each of the main surfaces is 0.11 nm or less. The arithmetic average roughness Ra is a value obtained through measurement using an atomic force microscope provided with a probe having a probe tip provided with a carbon nanofiber rod-shaped member. The magnetic-disk substrate is made of glass or aluminum alloy.
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