US 11,869,538 B2
Method for manufacturing glass spacer, glass spacer, and hard disk drive device
Masafumi Miura, Chaing Mai Province (TH); Kazuaki Hashimoto, Akiruno (JP); and Naoyuki Higuchi, Kokubunji (JP)
Assigned to HOYA CORPORATION, Tokyo (JP)
Appl. No. 17/909,583
Filed by HOYA CORPORATION, Tokyo (JP)
PCT Filed Mar. 8, 2021, PCT No. PCT/JP2021/008935
§ 371(c)(1), (2) Date Jan. 3, 2023,
PCT Pub. No. WO2021/177468, PCT Pub. Date Sep. 10, 2021.
Claims priority of provisional application 62/986,005, filed on Mar. 6, 2020.
Prior Publication US 2023/0223047 A1, Jul. 13, 2023
Int. Cl. G11B 17/02 (2006.01); G11B 23/03 (2006.01); G11B 5/73 (2006.01)
CPC G11B 17/021 (2013.01) [G11B 5/73921 (2019.05); G11B 23/03 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive device,
wherein the entire surface that includes a main surface and an edge surface of the glass spacer is covered by a film that contains at least one of tin oxide, zinc oxide, and titanium oxide, and
the thickness of the film on the edge surface of the glass spacer is larger than the thickness of the film on the main surface of the glass spacer.