公开(公告)号：US20210166849A1

公开(公告)日：2021-06-03

申请号：US17173437

申请日：2021-02-11

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01F1/34 ,  H01Q17/00 ,  C01G49/00

Abstract: The powder of the magnetoplumbite-type hexagonal ferrite is an aggregate of particles of a compound represented by Formula (1), and, in a particle size distribution based on number measured by a laser diffraction scattering method, in a case where a mode value is defined as a mode diameter, a diameter at a cumulative percentage of 10% is defined as D10 and a diameter at a cumulative percentage of 90% is defined as D90, the mode diameter is equal to or greater than 5 μm and less than 10 μm and an expression of (D90−D10)/mode diameter≤3.0 is satisfied. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. AFe(12-x)AlxO19  Formula(1)

公开(公告)号：US20210166851A1

公开(公告)日：2021-06-03

申请号：US17176296

申请日：2021-02-16

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01F1/34 ,  H05K9/00 ,  C01G49/00 ,  C30B29/22

Abstract: A powder mixture of a magnetoplumbite-type hexagonal ferrite is a mixture of powders of two or more kinds of compounds represented by Formula (1), the two or more kinds of compounds represented by Formula (1) are two or more kinds of compounds having different values of x in Formula (1), and are a powder mixture satisfying a relationship of xmax-xmin23 0.2, in a case where a maximum value of x is defined as xmax and a minimum value of x is defined as xmin, in two or more kinds of compounds having different values of x in Formula (1), and the application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. AFe(12-x) AlxO19   Formula (1)

公开(公告)号：US20220376402A1

公开(公告)日：2022-11-24

申请号：US17697268

申请日：2022-03-17

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01Q17/00 ,  H01F1/34 ,  G01N23/207

Abstract: A radio wave absorber including a magnetic powder and a binder, in which the magnetic powder is a powder of a hexagonal ferrite in which a ratio (σs/β) of a saturation magnetization as to a half-width β of a diffraction peak on a (107) plane is 240 emu·g−1·degree−1 or more, where the half-width β is determined by X-ray diffraction analysis.

公开(公告)号：US20220167535A1

公开(公告)日：2022-05-26

申请号：US17666894

申请日：2022-02-08

Applicant: FUJIFILM Corporation

Inventor： Yoshihiro NAKAI ,  Hirokazu HASHIMOTO

IPC: H05K9/00 ,  H01B1/22

Abstract: There is provided a radio wave absorbing composition containing a magnetic powder and a binder. There is also provided a radio wave absorber containing a magnetic powder and a binder. The magnetic powder is a powder of a substitution-type hexagonal ferrite subjected to surface treatment with a surface treatment agent, and the binder is a polyamide.

公开(公告)号：US20220061198A1

公开(公告)日：2022-02-24

申请号：US17518825

申请日：2021-11-04

Applicant: FUJIFILM Corporation

Inventor： Masashi SHIRATA ,  Hirokazu HASHIMOTO

IPC: H05K9/00 ,  H01F1/11

Abstract: There is provided a radio wave absorber including a powder of a hexagonal ferrite; and a binder, in which the radio wave absorber has a squareness ratio in a range of 0.40 to 0.60.

公开(公告)号：US20220059946A1

公开(公告)日：2022-02-24

申请号：US17518889

申请日：2021-11-04

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01Q17/00 ,  H01F1/34 ,  C01G49/00

Abstract: There is provided a radio wave absorber including a magnetic powder and a binder, in which a volume filling rate of the magnetic powder in the radio wave absorber is 35% by volume or less, and a volume filling rate of a carbon component in the radio wave absorber is 0% by volume or more and 2.0% by volume or less.

公开(公告)号：US20190073252A1

公开(公告)日：2019-03-07

申请号：US16120329

申请日：2018-09-03

Applicant: FUJIFILM CORPORATION

Inventor： Naoaki TOKAI ,  Hirokazu HASHIMOTO ,  Yosuke SUMIYA

IPC: G06F11/07 ,  G11B5/008 ,  G06F3/06

Abstract: A recording control device, a recording control method, and a recording tape cartridge capable of estimating a lifetime of the recording tape cartridge are obtained. A recording control device reads information correlated with an error rate of reading or writing of data from or to a magnetic tape included in a recording tape cartridge, the information being recorded on a RFID tag included in the recording tape cartridge, and a measurement date of the information, and estimates a lifetime of the recording tape cartridge using the read information and the read measurement date, and the information measured at the time of using the recording tape cartridge and a measurement date.

公开(公告)号：US20250167441A1

公开(公告)日：2025-05-22

申请号：US19023670

申请日：2025-01-16

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01Q3/00 ,  B29C64/118 ,  B29K67/00 ,  B29K105/00 ,  B29K105/16 ,  B29K509/02 ,  B29L31/34 ,  B33Y10/00 ,  B33Y80/00 ,  G01S13/931 ,  H01F1/113

Abstract: Provided are a method for manufacturing a radio wave absorber, the method including three-dimensionally modeling a composition containing one or more kinds of particles selected from the group consisting of magnetic particles and dielectric particles, and a binder, with a three-dimensional printer, in which an aspect ratio of the particles is 3.0 or less, a radio wave absorber including magnetic particles, and a binder, in which among squareness ratios measured for each of predetermined seven directions of the radio wave absorber, a maximum value is defined as SQmax, a minimum value is defined as SQmin, and a ratio (SQmax/SQmin) of SQmax to SQmin is less than 1.35, and a radio wave absorbing article including the radio wave absorber.

公开(公告)号：US20220059945A1

公开(公告)日：2022-02-24

申请号：US17517910

申请日：2021-11-03

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01Q17/00 ,  H01F1/34

Abstract: There is provided a radio wave absorber including a magnetic powder and a binder, in which a volume filling rate of the magnetic powder in the radio wave absorber is 35% by volume or less, a transmission attenuation amount is 8.0 dB or more, and a reflection attenuation amount is 8.0 dB or more.

公开(公告)号：US20210407715A1

公开(公告)日：2021-12-30

申请号：US17469166

申请日：2021-09-08

Applicant: FUJIFILM Corporation

Inventor： Hirokazu HASHIMOTO

IPC: H01F1/34 ,  H05K9/00 ,  C01G49/06

Abstract: A magnetoplumbite-type hexagonal ferrite powder containing a powder of a magnetoplumbite-type hexagonal ferrite represented by Formula (1) and a powder of a compound represented by Formula (2), in which a magnetic field strength Hα, which corresponds to 90% of a magnetization quantity obtained in a case where an external magnetic field of 50 kOe is applied, satisfies 19 kOe≤Hα≤28 kOe, a radio wave absorber, and a method of controlling resonance frequency of a magnetoplumbite-type hexagonal ferrite powder are provided. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. In Formula (2), Aa represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb. AFe(12-x)AlxO19  Formula (1) AaAl2O4  Formula (2)