MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, ANNULAR-SHAPED SUBSTRATE, AND METHOD FOR MANUFACTURING MAGNETIC DISK SUBSTRATE
This Laos Patent “MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, ANNULAR-SHAPED SUBSTRATE, AND METHOD FOR MANUFACTURING MAGNETIC DISK SUBSTRATE” is a public DIP intellectual-property record, filed by HOYA CORPORATION on 2022-02-24; current status: Awaiting formal examination. Identifiers include application No. P/921; DIP id LAP921; protection kind Patent - PCT National Phase. Key dates: publication 2026-04-10. Classification: B24B 1/00、B24B 9/00、C03C 19/00、G11B 5/73、G11B 5/84. Inventor(s)/designer(s): Shuhei, Toshio TAKIZAWA. Abstract hint: A magnetic disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic'…. This prose is informational only and does not constitute legal advice, ownership proof or an infringement opinion.
P/921
Mark
Key facts
- Type
- Patent
- App. no.
P/921- Status
- Awaiting formal examination
- Applicant
- HOYA CORPORATION
- Agent
- Tilleke & Gibbins Lao Co., Ltd
- Filing date
- 2022-02-24
- Publication
- 2026-04-10
- Protection kind
- Patent - PCT National Phase
- Nice / IPC classes
- B24B 1/00 · B24B 9/00 · C03C 19/00 · G11B 5/73 · G11B 5/84
- Goods / services
- —
Process
Steps follow the current public status-
Filed
-
Formal examination In progress
-
Substantive examination
-
Published
-
Granted
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Abstract
A magnetic disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic'disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 Irm or more on a cross'section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.
A magnetic disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic'disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 Irm or more on a cross'section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.
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