公开(公告)号：US20200321032A1

公开(公告)日：2020-10-08

申请号：US16453403

申请日：2019-06-26

Applicant: SONY CORPORATION

Inventor： Eiji NAKASHIO ,  Kazuo ANNO ,  Shinya TOCHIKUBO ,  Takanobu IWAMA

IPC: G11B27/30 ,  G11B23/03

Abstract: A magnetic recording medium is provided and including an average thickness tT satisfies tT≤5.5 [μm], and a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium satisfies 700 [ppm/N]≤Δw.

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：US20140268414A1

公开(公告)日：2014-09-18

申请号：US14206709

申请日：2014-03-12

Applicant: Sony Corporation

Inventor： Eiji NAKASHIO ,  Hiroshi MORITA ,  Kiyoyuki MIYATA

IPC: G11B5/78 ,  G11B5/008

CPC classification number: G11B5/78 ,  G11B5/00817 ,  G11B5/584 ,  G11B5/70 ,  G11B2005/0029

Abstract: There is provided a magnetic recording medium including a magnetic layer. The magnetic layer has a servo signal recorded thereon by magnetizing a part of the magnetic layer in a first direction. The first direction contains a component of a perpendicular direction that is perpendicular to a top surface of the magnetic layer. The magnetic layer is pre-magnetized in a second direction before recording of the servo signal. The second direction contains the component of the perpendicular direction. The second direction is opposite to the first direction.

Abstract translation: 提供了包括磁性层的磁记录介质。 磁性层通过在第一方向上磁化一部分磁性层而具有记录在其上的伺服信号。 第一方向包含垂直于磁性层顶表面的垂直方向的分量。 在记录伺服信号之前，磁层在第二方向被预磁化。 第二个方向包含垂直方向的分量。 第二方向与第一方向相反。