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.

公开(公告)号：US20240071419A1

公开(公告)日：2024-02-29

申请号：US18494381

申请日：2023-10-25

Applicant: HOYA CORPORATION

Inventor： Masafumi MIURA ,  Kazuaki HASHIMOTO ,  Naoyuki HIGUCHI

IPC: G11B17/02 ,  G11B5/73 ,  G11B23/03

CPC classification number: G11B17/021 ,  G11B5/73921 ,  G11B23/03

Abstract: A ring-shaped glass spacer is to be arranged in contact with a magnetic disk in a hard disk drive device. A film that contains at least one of tin oxide, zinc oxide, and titanium oxide is formed on each surface of a main surface, and an outer circumferential edge surface, and an inner circumferential edge surface of the glass spacer. The thickness of the film on a center portion of the outer circumferential edge surface of the glass spacer is larger than the thickness of the film on a center portion of the inner circumferential edge surface of the glass spacer.

公开(公告)号：US20230223047A1

公开(公告)日：2023-07-13

申请号：US17909583

申请日：2021-03-08

Applicant: HOYA CORPORATION

Inventor： Masafumi MIURA ,  Kazuaki HASHIMOTO ,  Naoyuki HIGUCHI

IPC: G11B17/02 ,  G11B5/73 ,  G11B23/03

CPC classification number: G11B17/021 ,  G11B5/73921 ,  G11B23/03

Abstract: A method for manufacturing a ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive device includes processing for forming a film on the surface of a glass spacer main body, which is the base of the glass spacer. In the processing, the film is formed by passing the glass spacer main body through a location where the components of the film are in a spray state while an outer circumferential edge surface of the glass spacer main body is being rotated in a circumferential direction thereof.