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公开(公告)号：US20180182422A1
公开(公告)日：2018-06-28
申请号：US15855412
申请日：2017-12-27
发明人： Shinji KAWAKAMI , Toshio HIROI , Masao FUJITA
CPC分类号： G11B5/714 , G11B5/70 , G11B5/70615 , G11B5/70642
摘要： In a magnetic recording medium according to the present invention, if a straight line W having a length of 500 nm and a width of 15 nm is displayed parallel to a width direction of the magnetic layer and a straight line L having a length of 500 nm and a width of 15 nm is displayed parallel to a longitudinal direction of the magnetic layer, the number of magnetic particles that intersect the straight line W is N1, and the number of magnetic particles that intersect the straight line L is N2, then, a relationship of N1/0.5>60 and N2/0.5>60 is established where N1/0.5 is the number of magnetic particles per micrometer obtained by dividing N1 by 0.5 μm and N2/0.5 is the number of magnetic particles per micrometer obtained by dividing N2 by 0.5 μm.
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公开(公告)号：US20200265977A1
公开(公告)日：2020-08-20
申请号：US16645547
申请日：2018-09-12
发明人： Masao FUJITA , Toshio HIROI
摘要： Provided is an electromagnetic-wave absorber composition and an electromagnetic-wave absorber that can favorably absorb a plurality of electromagnetic waves of different frequencies in a high frequency band in or above the millimeter-wave band. The electromagnetic-wave absorber composition includes a magnetic iron oxide that magnetically resonates at a high frequency in or above the millimeter-wave band and a resin binder. The electromagnetic-wave absorber composition has two or more extrema separated from each other on a differential curve obtained by differentiating a magnetic property hysteresis loop at an applied magnetic field intensity of from 16 kOe to −16 kOe. The electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer formed of the above-described electromagnetic-wave absorber composition.
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公开(公告)号：US20190287562A1
公开(公告)日：2019-09-19
申请号：US16352031
申请日：2019-03-13
发明人： Shinji KAWAKAMI , Masao FUJITA , Toshio HIROI
摘要： The magnetic recording medium disclosed in the present application includes a non-magnetic support, an undercoat layer, a magnetic layer containing magnetic particles, and a back coat layer. The coercive force Hc of the magnetic layer in the thickness direction at 25° C. is not 4100 oersteds (Oe) or more, and the coercive force Hc of the magnetic layer in the thickness direction at a temperature between 55° C. and 80° C. inclusive is not less than 1200 oersteds (Oe) and not more than 3700 oersteds (Oe).
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公开(公告)号：US20200227833A1
公开(公告)日：2020-07-16
申请号：US16632066
申请日：2018-07-20
发明人： Toshio HIROI , Masao FUJITA
摘要： Provided are an electromagnetic-wave absorbing composition that can favorably absorb electromagnetic waves of high frequencies in or above a millimeter-wave band and that can be applied to a desired portion in the form of a paste, and an easily deformable electromagnetic-wave absorber having flexibility. The electromagnetic-wave absorbing composition includes a rubber binder, a filler made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material. The electromagnetic-wave absorber includes a rubber binder 1b, a filler 1c made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material 1a, and is a nonresonant-type electromagnetic-wave absorber that is not provided with a reflective layer for reflecting incident electromagnetic waves.
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5.发明申请公开(公告)号：US20180350398A1
公开(公告)日：2018-12-06
申请号：US15997457
申请日：2018-06-04
发明人： Shinji KAWAKAMI , Toshio KAWAKITA , Masao FUJITA
摘要： A refractive index nL and an attenuation rate kL of a magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a lengthwise direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RL during vertical incidence of the linearly polarized light in the lengthwise direction is obtained based on nL and kL. A refractive index nT and an attenuation rate kT of the magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a width direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RT during vertical incidence of the linearly polarized light in the width direction is obtained from nT and kT. If a variation rate A (%) of RL and RT is A=|RL/RT−1|×100, the relationship A≤10% is established.
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公开(公告)号：US20210408695A1
公开(公告)日：2021-12-30
申请号：US17473450
申请日：2021-09-13
发明人： Masao FUJITA , Toshio HIROI
摘要： An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.
The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at frequencies in and above the millimeter wave band and a resin binder 1b. The electromagnetic wave absorbing sheet absorbs radiated electromagnetic waves by magnetic resonance of the magnetic iron oxide. The electromagnetic wave absorbing sheet has a flexibility evaluation value F (g/mm2) of more than 0 and 6 or less, which is determined by measuring an applied weight (g) that is required to bend a ribbon-like electromagnetic wave absorbing sheet in the elastic deformation region so that a distance d between the inner surfaces of the ribbon-like sheet at a position L spaced 10 mm from the bent portion of the ribbon-like sheet is 10 mm, and dividing the applied weight (g) by a cross-sectional area D (mm2) of the ribbon-like sheet.-
公开(公告)号：US20210225567A1
公开(公告)日：2021-07-22
申请号：US15734714
申请日：2019-05-31
发明人： Toshio HIROI , Masao FUJITA
摘要： To provide a transmission-type electromagnetic-wave absorber that can satisfactorily absorb electromagnetic waves of high frequencies in or above the millimeter-wave band while reducing the reflection of electromagnetic waves on the surface of the absorber. The transmission-type electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at a frequency in or above the millimeter-wave band and a binder 1b containing an organic material. The real part of the complex relative permittivity of the electromagnetic-wave absorber is 5.5 or less at 1 GHz.
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公开(公告)号：US20190269048A1
公开(公告)日：2019-08-29
申请号：US16319722
申请日：2017-07-19
发明人： Masao FUJITA , Toshio HIROI
摘要： Provided is an electromagnetic-wave absorber that can favorably absorb electromagnetic waves of a plurality of different frequencies in a high frequency band equal to or higher than the millimeter-wave band. The electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer 1 in which a plurality of magnetic layers 1a-1e are stacked, each magnetic layer containing magnetic iron oxide that magnetically resonates at a high frequency in a band equal to or higher than the millimeter-wave band. A value of an anisotropic magnetic field (HA) of the magnetic iron oxide contained in at least one of the magnetic layers is different from that of the magnetic iron oxide contained in another of the magnetic layers.
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公开(公告)号：US20200267877A1
公开(公告)日：2020-08-20
申请号：US16347389
申请日：2017-11-02
发明人： Toshio HIROI , Masao FUJITA
摘要： Provided is an electromagnetic-wave absorbing sheet that can favorably absorb electromagnetic waves of high frequencies in a frequency band equal to or higher than the millimeter-wave band while having elasticity of elongating in an in-plane direction. The electromagnetic-wave absorbing sheet includes an electromagnetic-wave absorbing layer 1 that contains a magnetic iron oxide 1a that magnetically resonates in a frequency band equal to or higher than the millimeter-wave band as an electromagnetic-wave absorbing material and a rubber binder 1b. The electromagnetic-wave absorbing sheet has a maximum elongation percentage of an elastic region in one in-plane direction of 20% to 200%.
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公开(公告)号：US20200008328A1
公开(公告)日：2020-01-02
申请号：US16485306
申请日：2018-03-13
发明人： Toshio HIROI , Masao FUJITA
摘要： An electromagnetic-wave absorbing sheet is realized which can favorably absorb electromagnetic waves with a high frequency in or above a millimeter-wave band, and has sufficient elasticity. The electromagnetic-wave absorbing sheet includes: an electromagnetic-wave absorbing layer 1 that includes a particulate electromagnetic-wave absorbing material 1a and a rubber binder 1b; and a dielectric layer 2 arranged on a back surface of the electromagnetic-wave absorbing layer. The electromagnetic-wave absorbing material is a magnetic iron oxide that magnetically resonates in a frequency band that is at least a millimeter-wave band. The dielectric layer is non-magnetic and has flexibility, a real part of a complex relative permittivity of the dielectric layer is 2 or more and 6 or less, and the dielectric layer has a thickness of 10 μm or more and 100 μm or less.
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