公开(公告)号：US20200005824A1

公开(公告)日：2020-01-02

申请号：US16489919

申请日：2018-02-20

Applicant: SHOWA DENKO K.K.

Inventor： Hiroyuki TOMITA ,  Hiroko HATTORI ,  Naoya FUKUMOTO ,  Ryuuta MIYASAKA ,  Naoko ITO ,  Ichiro OTA ,  Katsumi MUROFUSHI

IPC: G11B5/84 ,  G11B5/725 ,  C08G65/333 ,  C08G65/332 ,  C10M107/38

Abstract: A lubricant for a magnetic recording medium capable of forming a lubricant layer having excellent adhesion to a protective layer is provided. A lubricant for a magnetic recording medium contains a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one or both terminals of a perfluoroalkyl polyether chain. It is preferable that the group having the ethylenic carbon-carbon double bond is disposed at one terminal of the perfluoroalkyl polyether chain, and a hydroxyl group is disposed at other terminal. It is preferable that the lubricant for a magnetic recording medium contains a compound in which one or more functional groups selected from a hydroxyl group, an amino group, an amido group and a carboxyl group is disposed at one or both terminals of a perfluoroalkyl polyether chain.

公开(公告)号：US20220404439A1

公开(公告)日：2022-12-22

申请号：US17845594

申请日：2022-06-21

Applicant: SHOWA DENKO K.K.

Inventor： Hiroyuki TOMITA

IPC: G01R33/06

Abstract: An information processing device and a magnetic sensor system are provided, in which accuracy of frequency measurement is less likely to deteriorate even though the frequency of output signals outputted from the magnetic sensor increases, and which have detection limits for high frequency measurement even with a minute frequency change rate. An information processing device 120 includes: an obtaining part 31 obtaining an output signal outputted by a magnetic sensor and oscillating at a frequency determined in response to strength of a magnetic field; a frequency determination part 32 utilizing interference between the output signal and a reference signal with a reference frequency, which is a frequency used as a reference, to determine the frequency of the output signal; and a magnetic field calculation part 40 calculating the strength of the magnetic field based on the determined frequency of the output signal.

公开(公告)号：US20210188766A1

公开(公告)日：2021-06-24

申请号：US16640132

申请日：2018-07-30

Applicant: SHOWA DENKO K.K.

Inventor： Masaki NANKO ,  Naoya FUKUMOTO ,  Daisuke YAGYU ,  Yuta YAMAGUCHI ,  Tsuyoshi KATO ,  Hiroyuki TOMITA ,  Katsumi MUROFUSHI ,  Shohei NISHIZAWA

IPC: C07C255/13 ,  C07C43/205 ,  C07C255/17 ,  C07C255/19 ,  C07C255/50 ,  C07D333/16 ,  C08G65/08 ,  C10M107/38 ,  G11B5/725

Abstract: Provided is a fluorine-containing ether compound that can be suitably used as a material for a lubricant for a magnetic recording medium, capable of forming a lubricant layer having excellent chemical substance resistance and wear resistance even when the thickness is small. A fluorine-containing ether compound represented by the following formula (1): R1—R2—CH2—R3—CH2—R4—R5  (1) In the formula (1), R3 is a perfluoropolyether chain. R2 and R4 are divalent linkage groups having a polar group, and may be the same or different. R1 and R5 are terminal groups bonded to R2 or R4, which may be the same or different, and at least one of R1 and R5 is an organic group having 1 to 8 carbon atoms wherein one or more hydrogen atoms of the organic group is substituted with a cyano group.

公开(公告)号：US20190084911A1

公开(公告)日：2019-03-21

申请号：US16082349

申请日：2017-01-30

Applicant: SHOWA DENKO K.K.

Inventor： Daisuke YAGYU ,  Yuta YAMAGUCHI ,  Naoya FUKUMOTO ,  Tsuyoshi KATO ,  Shoko UETAKE ,  Hiroyuki TOMITA ,  Ryuuta MIYASAKA ,  Naoko ITO ,  Ichiro OTA ,  Katsumi MUROFUSHI

IPC: C07C43/23 ,  C07C43/178 ,  C07D333/16 ,  C07D303/26 ,  C07D409/12 ,  C07D277/24 ,  C10M105/54 ,  G11B5/733

Abstract: The present invention relates to a fluorine-containing ether compound represented by Formula (1), R1—R2—CH2—R3—CH2—R4  (1). (In Formula (1), R1 is an end group including an organic group having at least one double bond or triple bond, R2 is a divalent linking group bonded to R1 by etheric oxygen, R3 is a perfluoropolyether chain, R4 is an end group having two or three polar groups with each polar group being bonded to different carbon atoms, and the carbon atoms, to which the polar groups are bonded, being bonded to each other via a linking group including carbon atoms to which the polar groups are not bonded.)

公开(公告)号：US20220308126A1

公开(公告)日：2022-09-29

申请号：US17688363

申请日：2022-03-07

Applicant: SHOWA DENKO K.K.

Inventor： Hiroyuki TOMITA ,  Isao KABE

IPC: G01R33/06 ,  G01R33/00

Abstract: In a magnetic sensor using sensitive circuits sensing magnetic fields by the magnetic impedance effect, a sensitivity-to-noise ratio is improved. A magnetic sensor 10 includes: a sensitive circuit 12A including sensitive parts sensing magnetic fields by magnetic impedance effect; and a sensitive circuit 12B including sensitive parts sensing magnetic fields by magnetic impedance effect, wherein at least a part of current paths of the sensitive circuit 12A and at least a part of current paths of the sensitive circuit 12B overlap in a plan view, and one end portion of the sensitive circuit 12A and one end portion of the sensitive circuit 12B are electrically connected.

公开(公告)号：US20200283392A1

公开(公告)日：2020-09-10

申请号：US16759515

申请日：2018-08-28

Applicant: SHOWA DENKO K.K.

Inventor： Tsuyoshi KATO ,  Daisuke YAGYU ,  Naoya FUKUMOTO ,  Yuta YAMAGUCHI ,  Masumi KURITANI ,  Katsumi MUROFUSHI ,  Masaki NANko ,  Hiroyuki TOMITA

IPC: C07D231/12 ,  C10M107/24 ,  C10M107/38 ,  C10M107/40 ,  C10M107/46 ,  G11B5/725 ,  C07D277/24 ,  C07D333/16

Abstract: Provided is a fluorine-containing ether compound capable of forming a lubricant layer having excellent wear resistance even when the thickness is thin, and suitable as a material of a lubricant for a magnetic recording medium. The fluorine-containing ether compound is a compound represented by the following formula (1): R1—R2—CH2—R3—CH2—R4—R5; wherein R3 is a perfluoropolyether chain; R1 is a terminal group bonded to R2; R5 is a terminal group bonded to R4; R1 is an alkenyl group or an alkynyl group; R5 is a group containing a heterocyclic ring; R2 is represented by the following formula (2); R4 is represented by the following formula (3); and a in the formula (2) and b in the formula (3) are each independently an integer of 1 to 3.

公开(公告)号：US20190382676A1

公开(公告)日：2019-12-19

申请号：US16480483

申请日：2018-01-05

Applicant: SHOWA DENKO K.K.

Inventor： Yuta YAMAGUCHI ,  Daisuke YAGYU ,  Naoya FUKUMOTO ,  Shoko UETAKE ,  Tsuyoshi KATO ,  Hiroyuki TOMITA ,  Ryuuta MIYASAKA ,  Katsumi MUROFUSHI

IPC: C10M107/46 ,  C08G65/334 ,  C08G65/333 ,  C10M107/44 ,  C07D333/16 ,  C07D231/12 ,  C07D277/24 ,  C07D409/12 ,  C07D213/68 ,  G11B5/725

Abstract: A fluorine-containing ether compound represented by Formula (1) is provided. R1—R2—CH2—R3—CH2—R4—R5   (1) (In Formula (1), R1 and R5 each represents a group having a heterocyclic ring and may be the same as or different from each other, R2 and R4 each represents a divalent linking group having a polar group and play be the same as or different from each other, and R3 represents a perfluoropolyether chain.)

公开(公告)号：US20220196762A1

公开(公告)日：2022-06-23

申请号：US17457299

申请日：2021-12-02

Applicant: SHOWA DENKO K.K

Inventor： Daizo ENDO ,  Hiroyuki TOMITA

IPC: G01R33/06

Abstract: The sensitivity of a magnetic sensor using a sensitive element sensing a magnetic field by the magnetic impedance effect is increased. The magnetic sensor includes: a sensitive element sensing a magnetic field by a magnetic impedance effect; and a focusing member provided to face the sensitive element, configured with a soft magnetic material, and focusing magnetic force lines from outside onto the sensitive element.

公开(公告)号：US20200263104A1

公开(公告)日：2020-08-20

申请号：US15999837

申请日：2017-02-20

Applicant: SHOWA DENKO K.K.

Inventor： Yuta YAMAGUCHI ,  Naoya FUKUMOTO ,  Naoko ITO ,  Hiroyuki TOMITA ,  Ichiro OTA ,  Katsumi MUROFUSHI

IPC: C10M105/54 ,  C07C43/13 ,  G11B5/725

Abstract: A fluorine-containing ether compound represented by a formula (1) shown below. R4—CH2—R3—CH2—R2—CH2—R1—CH2—R2—CH2—R3—CH2—R5  (1) In formula (1), R1 and R3 represent the same or different perfluoropolyether chains, R2 represents a linking group containing at least one polar group, one or both of R4 and R5 represent a terminal group containing two or more polar groups, and R4 and R5 are different.

公开(公告)号：US20180047419A1

公开(公告)日：2018-02-15

申请号：US15664013

申请日：2017-07-31

Applicant: SHOWA DENKO K.K.

Inventor： Naoya FUKUMOTO ,  Daisuke YAGYU ,  Yuta YAMAGUCHI ,  Shoko UETAKE ,  Tsuyoshi KATO ,  Hiroyuki TOMITA ,  Ryuta MIYASAKA ,  Katsumi MUROFUSHI

IPC: G11B5/725 ,  C10M105/54 ,  C08G65/26 ,  C07C43/13

Abstract: A fluorine-containing ether compound of the present invention is represented by Formula (1). R1—CH2—R2—CH2—R3  (1) (In Formula (1), R1 is an organic end group having 3 or more carbon atoms which includes two or more polar groups with each polar group being bonded to different carbon atoms and the carbon atoms to which the polar groups are bonded being bonded to each other via a linking group including the carbon atoms which are not bonded to the polar groups, R2 includes a perfluoropolyether chain represented by Formula (3), and R3 is a hydroxyl group or R1) —(CF2)y-1—O—((CF2)yO)z—(CF2)y-1—  (3) (In Formula (3), y represents an integer of 2 to 4, and z represents an integer of 1 to 30).