公开(公告)号：US12183365B2

公开(公告)日：2024-12-31

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

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：US11869538B2

公开(公告)日：2024-01-09

申请号：US17909583

申请日：2021-03-08

Applicant: HOYA CORPORATION

Inventor： Masafumi Miura ,  Kazuaki Hashimoto ,  Naoyuki Higuchi

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

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.