专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20210090600A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS 有权
公开(公告)号：US20210090600A1
公开(公告)日：2021-03-25
申请号：US17022446
申请日：2020-09-16
申请人： FUJIFILM Corporation
发明人： Takuto KUROKAWA , Naoki SANO , Norihito KASADA , Eiki OZAWA , Megumi NAKANO
IPC分类号： G11B5/72 , G11B5/733 , G11B5/73 , G11B5/712 , G11B5/008
摘要： The magnetic recording medium includes a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which a difference between a spacing measured on a surface of the back coating layer by optical interferometry under a pressure of 0.5 atm after n-hexane cleaning and a spacing measured on the surface of the back coating layer by optical interferometry under a pressure of 13.5 atm after n-hexane cleaning is 3 nm or less.

2. 发明申请

US20160064025A1 MAGNETIC RECORDING MEDIUM 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20160064025A1
公开(公告)日：2016-03-03
申请号：US14838663
申请日：2015-08-28
申请人： FUJIFILM CORPORATION
发明人： Takuto KUROKAWA , Kazutoshi KATAYAMA
IPC分类号： G11B5/71
CPC分类号： G11B5/71
摘要： The magnetic recording medium comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer comprises a lubricant and a 1-bromonaphthalene contact angle adjusting agent that is capable of adjusting a contact angle for 1-bromonaphthalene, the contact angle for 1-bromonaphthalene being measured on a surface of the magnetic layer, and the contact angle measured on the surface of the magnetic layer ranges from 45.0° to 55.0° for 1-bromonaphthalene, and ranges from 90.0° to 100.0° for water.
摘要翻译：磁记录介质包括在非磁性载体上包含非磁性粉末和粘合剂的非磁性层，以及在非磁性层上包含铁磁性粉末和粘合剂的磁性层，其中磁性层包含润滑剂和能够使用的1-溴萘接触角调节剂调整1-溴萘的接触角时，在磁性层的表面上测定了1-溴萘的接触角，对于1-溴萘，在磁性层的表面测定的接触角为45.0〜55.0° ，水的范围为90.0°〜100.0°。

3. 发明申请

US20230099064A1 MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE DEVICE 有权
公开(公告)号：US20230099064A1
公开(公告)日：2023-03-30
申请号：US17953149
申请日：2022-09-26
申请人： FUJIFILM Corporation
发明人： Yujin SHIBATA , Norihito KASADA , Takuto KUROKAWA , So MATSUYAMA
IPC分类号： G11B5/65 , G11B23/107 , G11B5/008 , G11B5/584 , G11B5/733 , G11B5/78
摘要： The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.

4. 发明申请

US20190304488A1 MAGNETIC TAPE, MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开
公开(公告)号：US20190304488A1
公开(公告)日：2019-10-03
申请号：US16368044
申请日：2019-03-28
申请人： FUJIFILM Corporation
发明人： Eiki OZAWA , Takuto KUROKAWA
IPC分类号： G11B5/008 , G11B5/712 , G11B5/584
摘要： The magnetic tape includes a non-magnetic support; a magnetic layer including a ferromagnetic powder and a binding agent on one surface of the non-magnetic support; and a back coating layer including a non-magnetic powder and a binding agent on the other surface of the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the back coating layer is equal to or smaller than 7.0 nm, and a difference between a spacing Safter measured by optical interferometry regarding the surface of the back coating layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before methyl ethyl ketone cleaning is greater than 0 nm and equal to or smaller than 30.0 nm.

5. 发明申请

US20190027175A1 MAGNETIC TAPE 审中-公开
公开(公告)号：US20190027175A1
公开(公告)日：2019-01-24
申请号：US16038771
申请日：2018-07-18
申请人： FUJIFILM Corporation
发明人： Takuto KUROKAWA , Norihito KASADA , Toshio TADA , Eiki OZAWA
IPC分类号： G11B5/702 , G11B5/735 , G11B5/708 , G11B5/716
摘要： The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, a center line average surface roughness measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°.

6. 发明申请

US20170249965A1 MAGNETIC TAPE 审中-公开
公开(公告)号：US20170249965A1
公开(公告)日：2017-08-31
申请号：US15443094
申请日：2017-02-27
申请人： FUJIFILM Corporation
发明人： Takuto KUROKAWA , Norihito KASADA , Masahito OYANAGI
IPC分类号： G11B5/735 , G11B5/733 , G11B5/73 , G11B5/78 , G11B5/70
CPC分类号： G11B5/735 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/78
摘要： The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, and the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°.

7. 发明申请

US20210383827A1 MAGNETIC RECORDING AND REPRODUCING DEVICE 有权
公开(公告)号：US20210383827A1
公开(公告)日：2021-12-09
申请号：US17338694
申请日：2021-06-04
申请人： FUJIFILM Corporation
发明人： So MATSUYAMA , Norihito KASADA , Takuto KUROKAWA
IPC分类号： G11B5/31 , G11B5/706 , G11B5/714 , G11B5/735
摘要： The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.2 μm or greater and less than 0.5 μm. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.

8. 发明申请

US20190304498A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开
公开(公告)号：US20190304498A1
公开(公告)日：2019-10-03
申请号：US16368199
申请日：2019-03-28
申请人： FUJIFILM Corporation
发明人： Eiki OZAWA , Takuto KUROKAWA
IPC分类号： G11B5/706 , G11B5/78 , G11B5/127
摘要： The magnetic recording medium including: a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the magnetic layer is 1.0 nm to 1.6 nm, and a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the magnetic layer before methyl ethyl ketone cleaning is greater than 0 nm and equal to or smaller than 15.0 nm.

9. 发明申请

US20190027181A1 MAGNETIC TAPE 审中-公开
公开(公告)号：US20190027181A1
公开(公告)日：2019-01-24
申请号：US16038847
申请日：2018-07-18
申请人： FUJIFILM Corporation
发明人： Eiki OZAWA , Toshio TADA , Norihito KASADA , Takuto KUROKAWA
IPC分类号： G11B5/78 , G11B5/71 , G11B5/712 , G11B5/706 , G11B5/008
摘要： Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.

10. 发明申请

US20190027176A1 MAGNETIC RECORDING MEDIUM 审中-公开
公开(公告)号：US20190027176A1
公开(公告)日：2019-01-24
申请号：US16037564
申请日：2018-07-17
申请人： FUJIFILM Corporation
发明人： Takuto KUROKAWA , Norihito KASADA , Toshio TADA , Eiki OZAWA
IPC分类号： G11B5/706
CPC分类号： G11B5/70615 , G11B5/70 , G11B5/70678 , G11B5/7085
摘要： The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式