US Patent 11094345 Magnetic-disk substrate, magnetic disk, and magnetic-disk drive device
Patent 11094345 was granted and assigned to Hoya on August, 2021 by the United States Patent and Trademark Office.
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Patent abstract
A magnetic-disk substrate has a pair of main surfaces, and an arithmetic average roughness Ra of each of the main surfaces is 0.11 nm or less. The arithmetic average roughness Ra is a value obtained through measurement using an atomic force microscope provided with a probe having a probe tip provided with a carbon nanofiber rod-shaped member. The magnetic-disk substrate is made of glass or aluminum alloy.
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Patent Applicant
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Patent Jurisdiction
Patent Number
110943450
Date of Patent
August 17, 2021
0Patent Application Number
201904260
Date Filed
April 26, 2019
0Official Website
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Patent Applicant
0
Current Assignee
0
Patent Jurisdiction
Patent Number
110943450
Date of Patent
August 17, 2021
0Patent Application Number
201904260
Date Filed
April 26, 2019
0Official Website
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US Patent 11094345 Magnetic-disk substrate, magnetic disk, and magnetic-disk drive device
Infobox
Is a
Patent applicant
Current assignee
Patent jurisdiction
Patent number
11094345
Date of patent
August 17, 2021
Patent application number
20190426
Date Filed
April 26, 2019
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