公开(公告)号：US20180114541A1

公开(公告)日：2018-04-26

申请号：US15565050

申请日：2016-03-08

Applicant: Sony Corporation

Inventor： Eiji NAKASHIO ,  Futoshi SASAKI ,  Yuuichi MASUZAWA ,  Masaru TERAKAWA ,  Minoru YAMAGA ,  Yoichi KANEMAKI ,  Kazuya HASHIMOTO ,  Tomoe SATO ,  Nobuyuki SASAKI

IPC: G11B5/733 ,  G11B5/73

CPC classification number: G11B5/733 ,  G11B5/70 ,  G11B5/731

Abstract: Provided is a magnetic recording medium including: a support body; a base layer containing carbon particle powder and metal-containing particle powder; and a recording layer. In a recording surface, a maximum indentation depth h is 85≤h≤140, and a ratio d of a permanent strain to an elastic recovery (permanent strain/elastic recovery) is 0.95≤d≤1.25.

公开(公告)号：US20200321025A1

公开(公告)日：2020-10-08

申请号：US16099298

申请日：2017-05-11

Applicant: SONY CORPORATION

Inventor： Eiji NAKASHIO ,  Yuta AKIMOTO ,  Tomoe SATO ,  Yoichi KANEMAKI ,  Nobuyuki SASAKI ,  Masaru TERAKAWA ,  Kazuya HASHIMOTO ,  Katsunori MAESHIMA ,  Minoru YAMAGA ,  Hikaru TERUI ,  Hiroyuki KOBAYASHI

IPC: G11B5/706 ,  B32B7/022

Abstract: A magnetic recording medium includes an elongated substrate, and a reinforcing layer and a carbon thin film disposed on one surface of the substrate.

公开(公告)号：US20190143637A1

公开(公告)日：2019-05-16

申请号：US16099625

申请日：2017-05-11

Applicant: Sony Corporation

Inventor： Eiji NAKASHIO ,  Yuta AKIMOTO ,  Tomoe SATO ,  Yoichi KANEMAKI ,  Nobuyuki SASAKI ,  Masaru TERAKAWA ,  Kazuya HASHIMOTO ,  Katsunori MAESHIMA ,  Minoru YAMAGA ,  Hikaru TERUI ,  Hiroyuki KOBAYASHI

IPC: B32B7/02 ,  G11B5/735 ,  G11B5/738 ,  G11B5/78

Abstract: A magnetic recording medium according to a first technique includes an elongated substrate having a first surface and a second surface, a first reinforcing layer disposed on the first surface, a second reinforcing layer disposed on the second surface, an adhesion suppressing layer disposed on the second reinforcing layer, and a recording layer disposed on the first reinforcing layer or the adhesion suppressing layer.

公开(公告)号：US20190013043A1

公开(公告)日：2019-01-10

申请号：US16070140

申请日：2016-12-14

Applicant: Sony Corporation

Inventor： Eiji NAKASHIO ,  Masaru TERAKAWA ,  Yoichi KANEMAKI ,  Tomoe SATO ,  Katsunori MAESHIMA ,  Nobuyuki SASAKI

IPC: G11B5/65

Abstract: The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more.