公开(公告)号：US20230015283A1

公开(公告)日：2023-01-19

申请号：US17947993

申请日：2022-09-19

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: B24B9/10 ,  B32B7/022 ,  G11B5/73 ,  B32B27/32 ,  B32B27/36 ,  B32B27/40 ,  B32B37/10 ,  B32B37/14 ,  B32B37/18 ,  B32B38/00 ,  C03C19/00 ,  G11B5/84

Abstract: A sheet-like spacer to be used when a laminate of a plurality of subs rates is formed for the purpose of processing end faces of the substrates is provided between the adjacent substrates in the laminate to keep the adjacent substrates apart from each other. An area of the spacer is smaller than that of the substrates. A contact angle of a surface of the spacer with respect to pure water is 50° or less.

公开(公告)号：US20220157340A1

公开(公告)日：2022-05-19

申请号：US17589824

申请日：2022-01-31

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO ,  Shinji EDA

IPC: G11B17/02 ,  G11B17/038

Abstract: A method for manufacturing the ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus, including: preparing a ring-shaped glass blank; and grinding main surfaces of the ring-shaped glass blank by using grinding pads that include diamond particles as fixed abrasive particles.

公开(公告)号：US20200211596A1

公开(公告)日：2020-07-02

申请号：US16634128

申请日：2018-10-01

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO ,  Shinji EDA

IPC: G11B17/02 ,  G11B17/038

Abstract: In order to suppress the occurrence of adhesion between magnetic disks and spacers when the magnetic disks and the spacers are removed from a hard disk drive apparatus in which the magnetic disks and the spacers are installed, a surface roughness Ra of a main surface of a ring-shaped glass spacer to be arranged in contact with a magnetic disk is set to be not larger than 1.0 μm, and an average inclination RΔa of the main surface is set to be at least 0.02.

公开(公告)号：US20240082979A1

公开(公告)日：2024-03-14

申请号：US18510901

申请日：2023-11-16

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: B24B9/10 ,  B32B7/022 ,  B32B27/32 ,  B32B27/36 ,  B32B27/40 ,  B32B37/10 ,  B32B37/14 ,  B32B37/18 ,  B32B38/00 ,  C03C19/00 ,  G11B5/73 ,  G11B5/84

CPC classification number: B24B9/10 ,  B32B7/022 ,  B32B27/32 ,  B32B27/36 ,  B32B27/40 ,  B32B37/10 ,  B32B37/144 ,  B32B37/18 ,  B32B38/105 ,  C03C19/00 ,  G11B5/73921 ,  G11B5/8404 ,  B32B2250/42 ,  B32B2307/7265 ,  B32B2307/734 ,  B32B2315/08 ,  B32B2323/10 ,  B32B2367/00 ,  B32B2375/00 ,  B32B2429/02

Abstract: A method for manufacturing a substrate includes processing a side face of a laminate that includes substrates and a sheet-shaped spacer disposed between adjacent substrates. The processing of the side face includes bringing the laminate into a pressed state, first side face processing for processing a side face of the laminate in the pressed state, releasing the laminate from the pressed state after the first side face processing, intermediate processing for performing one of dividing the laminate released from the pressed state into two or more laminates, combining the laminate released from the pressed state with another laminate in a stacking direction, and leaving the laminate released from the pressed state as it is, bringing the laminate that has undergone the intermediate processing into a pressed state after the intermediate processing, and processing a side face of the laminate in the pressed state after the intermediate processing.

公开(公告)号：US20210005220A1

公开(公告)日：2021-01-07

申请号：US16644127

申请日：2019-03-11

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: G11B5/84 ,  G11B5/73 ,  C03C19/00 ,  B32B17/06 ,  B32B27/32 ,  B32B27/36 ,  B32B27/40 ,  B32B37/10 ,  B32B37/14 ,  B32B37/18 ,  B32B7/022 ,  B32B38/00 ,  B24B9/10

Abstract: The area of a spacer that is to be provided between the adjacent substrates in a laminate including a plurality of substrates to keep the adjacent substrates apart from each other is smaller than those of the stacked substrates. When pressure is released to bring the laminate obtained by providing the spacers between the substrates from a pressed state in which 0.60 MPa of pressure is applied to the laminate in the stacking direction into a non-pressed state, an amount of change ΔW in thickness per spacer that is calculated from a change in the thickness of the laminate due to the release of pressure is 30 μm or less.

公开(公告)号：US20200234731A1

公开(公告)日：2020-07-23

申请号：US16634079

申请日：2018-08-31

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: G11B17/028 ,  G11B25/04 ,  G11B17/038

Abstract: When removing magnetic disks and spacers from a hard disk drive apparatus, as necessary, during the assembly of the hard disk drive apparatus, in order to suppress the occurrence of removal failures when removing the spacers using a gripping jig, a surface roughness Rz of an outer circumferential edge surface of a spacer is set to be at least 1.5 μm.

公开(公告)号：US20240347076A1

公开(公告)日：2024-10-17

申请号：US18754466

申请日：2024-06-26

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: G11B17/038 ,  G11B25/04

CPC classification number: G11B17/038 ,  G11B25/043

Abstract: A hard disk drive includes a magnetic disk, and an annular spacer. The annular space includes two main surfaces, an inner circumferential surface, an outer circumferential surface, and a chamfered surface present between the outer circumferential surface and each of the two main surfaces. The annular spacer is disposed such that one of the two main surfaces is in contact with the magnetic disk. At least one main surface of the two main surfaces includes an inclined region, and the inclined region is inclined in an outer circumferential region of the at least one main surface toward a boundary between the at least one main surface and the chamfered surface such that a surface height of the spacer gradually decreases toward the boundary. The magnetic disk has a thickness of 0.55 mm or less. A material of a substrate for the magnetic disk includes aluminum alloy.

公开(公告)号：US20230368815A1

公开(公告)日：2023-11-16

申请号：US18029251

申请日：2021-09-30

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: G11B17/038

CPC classification number: G11B17/038

Abstract: Provided is an annular spacer to be disposed such that a main surface of the spacer is in contact with a magnetic disk in a hard disk drive device, the spacer including two main surfaces; an inner circumferential surface; and an outer circumferential surface, in which a chamfered surface is present between the outer circumferential surface and each of the two main surfaces, and at least a portion of an outer circumferential region of at least one of the two main surfaces includes an inclined region that is inclined toward the other main surface side in a radial direction from a center of the spacer to the outer circumferential surface side.

公开(公告)号：US20210090603A1

公开(公告)日：2021-03-25

申请号：US17111068

申请日：2020-12-03

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO

IPC: G11B17/028 ,  G11B17/038 ,  G11B25/04

Abstract: A ring-shaped spacer is to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A maximum height surface roughness Rz of an outer circumferential edge surface of the spacer is at least 1.5 μm, and the spacer is made of amorphous glass.

公开(公告)号：US20200270174A1

公开(公告)日：2020-08-27

申请号：US16645741

申请日：2018-12-20

Applicant: HOYA CORPORATION

Inventor： Masao TAKANO ,  Kashio NAKAYAMA

IPC: C03C19/00 ,  F21V8/00 ,  B24B7/24

Abstract: A method for manufacturing a disk-shaped glass substrate is a method for manufacturing a disk-shaped glass substrate for cutting out one or more thin glass substrates. The method for manufacturing a disk-shaped glass substrate includes preparing a disk-shaped glass blank, which is a glass blank having two circular main surfaces, chamfering an outer edge portion of each of the two main surfaces of the disk-shaped glass blank, grinding the two main surfaces of the chamfered disk-shaped glass blank, using a double-side grinding apparatus, and polishing the two main surfaces of the ground disk-shaped glass blank, using a double-side polishing apparatus.