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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.:

US 7635529 B1

PDFFull Text
Date of Patent:
Dec. 22, 2009

Filed:

Jun. 28, 2006

Substrate for magnetic recording media, magnetic recording media and magnetic recording apparatus

Applicants:

Katsuyuki Naito, Tokyo, JP;

Masatoshi Sakurai, Tokyo, JP;

Akira Kikitsu, Yokohama, JP;

Yoshiyuki Kamata, Tokyo, JP;

Naoko Kihara, Matsudo, JP;

Masahiro Oka, Ichihara, JP;

Inventors:

Katsuyuki Naito, Tokyo, JP;

Masatoshi Sakurai, Tokyo, JP;

Akira Kikitsu, Yokohama, JP;

Yoshiyuki Kamata, Tokyo, JP;

Naoko Kihara, Matsudo, JP;

Masahiro Oka, Ichihara, JP;

Assignees:

Showa Denko K.K., Tokyo, JP;

Kabushiki Kaisha Toshiba, Tokyo, JP;

Attorney:

Pillsbury Winthrop Shaw Pittman, LLP

Primary Examiner:

Kevin M Bernatz

Assistant Examiner:

Louis Falasco

Int. Cl.
CPC ...
G11B 5/71 (2006.01); G11B 5/82 (2006.01);
U.S. Cl.
CPC ...
Abstract

According to one embodiment, a substrate for a magnetic recording media has circumferential protrusions corresponding to recording tracks and circumferential recesses corresponding to grooves between the recording tracks, in which the substrate satisfying at least one of conditions of (a) a surface of the recess has a surface energy smaller than that of the protrusion, (b) the surface of the recess is modified with a thermally decomposable or deformable substance, (c) the surface of the recess has surface roughness smaller than that of the protrusion, (d) crystal orientation is more disturbed on the surface of the recess than on the protrusion, (e) the surface of the recess is modified with a substance that causes reaction with a magnetic material or that diffuses into the magnetic material, and (f) the surface of the recess is modified with a substance soluble in a solvent or with a deformable substance.

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Naito, Katsuyuki. (2009). Substrate for magnetic recording media, magnetic recording media and magnetic recording apparatus (U.S. Patent No. 7635529). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7635529

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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