Non-Magnetic Substrate For Magnetic Disk, And Magnetic Disk
This Laos Patent “Non-Magnetic Substrate For Magnetic Disk, And Magnetic Disk” is a public DIP intellectual-property record, filed by HOYA CORPORATION on 2018-04-02; current status: Registered. Identifiers include application No. P/855; DIP id LAP855; protection kind Patent - PCT National Phase. Key dates: publication 2026-01-23; grant 2025-04-22; expiry reference 2038-04-02. Classification: G11B 5/73、G11B 5/738、G11B 5/84. Inventor(s)/designer(s): Kinobu OSAKABE. Abstract hint: A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, the substrate main body made…. Status labels may change after office actions; refresh or consult primary DIP data before commercial decisions.
P/855
Mark
Key facts
- Type
- Patent
- App. no.
P/855- Status
- Registered
- Applicant
- HOYA CORPORATION
- Agent
- Tilleke & Gibbins Lao Co., Ltd
- Filing date
- 2018-04-02
- Reg. no.
P/855- Publication
- 2026-01-23
- Registration / grant
- 2025-04-22
- Expiry
- 2038-04-02
- Protection kind
- Patent - PCT National Phase
- Gazette
- 301 · 2025-04-25
- Priority
- JP · 2017-070232 · 2017-03-31；JP · 2021-189876 · 2021-11-24；LA · 679 · 2019-09-26
- Applicant address
- HOYA CORPORATION · 6-10-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 1608347, Japan · JP
- Agent address
- Tilleke & Gibbins Lao Co., Ltd · No. 302, 3rd Floor, Vieng Vang Tower, Unit 15, Boulichan Road, Dongpalan Thong Village, Sisattanak District, Vientiane Capital, Lao PDR · LA
- Nice / IPC classes
- G11B 5/73 · G11B 5/738 · G11B 5/84
- Goods / services
- —
Process
Steps follow the current public status-
Filed
-
Formal examination
-
Substantive examination
-
Published
-
Granted
Related records
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Abstract
A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, the substrate main body made of glass or aluminum alloy, and a metal film that is formed on the main surfaces and an outer circumferential edge surface of the substrate main body and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness g1+D) of 0.700 mm or less, the thickness (t+O) being the sum of a thickness T of the substoate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the zubstrate main body is 0.025 or more. The outer circumferential edge surface of the substrate main body forming an interface with the metal film has a surface roughness maximum height Rz of 0.5 um or more.
A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, the substrate main body made of glass or aluminum alloy, and a metal film that is formed on the main surfaces and an outer circumferential edge surface of the substrate main body and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness g1+D) of 0.700 mm or less, the thickness (t+O) being the sum of a thickness T of the substoate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the zubstrate main body is 0.025 or more. The outer circumferential edge surface of the substrate main body forming an interface with the metal film has a surface roughness maximum height Rz of 0.5 um or more.
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