The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2013
Filed:
Jan. 11, 2012
Takeshi Watanabe, Penang, MY;
Takeshi Watanabe, Penang, MY;
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Abstract
A magnetic disk is provided wherein a non-magnetic substrate, a magnetic layer, a protection layer, and a lubrication layer are sequentially stacked. The surface of the lubrication layer has irregular structure patterns along a circumferential direction of the magnetic disk that have circumferential lengths that each correspond to a central angle. The irregular structure patterns may be formed by an adsorption between the lubrication layer and the surface of the protection layer. When a natural frequency of a magnetic head slider used to record to the magnetic disk is f and the magnetic disk rotation speed is R, the central angle is set so as not to coincide with an angle θexpressed by θ=360 ×(R/60)/(f×1000).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile