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1. 发明专利

JPH10289440A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING METHOD 失效
公开(公告)号：JPH10289440A
公开(公告)日：1998-10-27
申请号：JP4628598
申请日：1998-02-12
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： CHO TSUTOMU , SHIGETA MASAO , KARATSU SHINKO , FUJII MARI , ISHIZAKA TSUTOMU , SAITO KATSUMI , WAKAYAMA KATSUHIKO , MIMURA SHOHEI , ITO MASAHIRO
IPC分类号： C09D5/23 , B22F9/04 , B22F9/08 , C09D7/12 , C22C38/00 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/706 , G11B5/73 , G11B5/80 , G11B11/14 , H01F1/047 , H01F10/14
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium which can effectively prevent recording information from being altered and a method for recording and reproducing the magnetic recording medium. SOLUTION: This medium has a recording medium formed of crystalline alloy containing Fe and Al. This recording material consists of Fe and Al by >=90 atomic % in total and the atomic ratio Al/(Fe+Al) is 0.30 to 0.45. This recording material varies from an irregular phase to a regular phase by being heated. The saturated magnetism of this recording material is >=45 emu/g before being heated and decreases by >=35 emu/g owing to the heating. This recording material has dark parts observed in a bright field image of a transmission type electron microscope; and the dark parts occupy the recording material at a 15 to 60% area ratio and the maximum width of the dark parts is 10 to 200 nm.

2. 发明专利

JPH05174360A MAGNETIC RECORDING MEDIUM AND RECORDING SYSTEM 失效
公开(公告)号：JPH05174360A
公开(公告)日：1993-07-13
申请号：JP35407091
申请日：1991-12-19
申请人： TOKYO JIKI INSATSU KK , TDK CORP
发明人： MIMURA SHOHEI , TAKAHASHI HARUYUKI , YONEYAMA TETSUTO , MORO EIJI
IPC分类号： B42D15/10 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G06K19/06 , G11B5/706 , G11B5/73 , G11B5/80
摘要： PURPOSE:To prevent forgery by heating and writing in the magnetic recording medium formed by mixing a 2nd magnetic material having low coercive force and high Curie temp. into a 1st magnetic material having high coercive force and low Curie CONSTITUTION:The magnetic recording layer 3 constituted by mixing the magnetic material 2 having the low coercive force and the high Curie temp. and the magnetic material 1 having the high coercive force and the low Curie temp. is formed on a base body 4. Recording is executed by heating the recording medium to the temp. slightly lower than the Curie temp. of the magnetic material 1 at the time of recording. The coercive force of the magnetic material decreases considerably and the recording current is extremely little at this time. The recording is executed only to the magnetic material under heating if the recording current is set smaller than the recording current to the magnetic material 2. The recording is not executed at all by degaussing the magnetic material 2 at the time of reading when the magnetic material 1 is not recorded. Further, both the magnetic materials are magnetized and the outputs and output waveforms different from the outputs and output waveforms of the magnetic material 1 alone are obtd. if the recording is executed with the large current by using a magnetic head core consisting of 'PB Permalloy(R)', etc. The forgery is prevented by such constitution.

3. 发明专利

JPH02180005A SOFT MAGNETIC ALLOY POWDER AND MANUFACTURE THEREOF, AMORPHOUS ALLOY SOFT MAGNETIC POWDER, AND MAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPH02180005A
公开(公告)日：1990-07-12
申请号：JP33419788
申请日：1988-12-29
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： SHIGETA MASAO , CHO TSUTOMU , SHIMIZU HIROZUMI , HIRAI KAZUNORI , MIMURA SHOHEI , MAKIMURA ATSUSHI , HOSAKA HIROSHI
IPC分类号： B22F9/08 , B22F1/00 , H01F1/153 , H01F1/20 , H05K9/00
摘要： PURPOSE:To obtain good magnetic properties by setting the mean particle diameter D50 by weight of soft magnetic alloy powder manufactured by a water atomizing method to be 5-30mum. CONSTITUTION:The mean particle diameter D50 by weight of soft magnetic alloy powder manufactured by a water atomizing method is set to be 5-30mum. Additionally, bulk density is set to be 2g/cm or more and to contain iron, silicon, and B. For manufacturing the soft magnetic alloy powder, high pressure water is injected into alloy melt, and solidified and powdered and cooled in water. Hereby, good magnetic property amosphous alloy soft magnetic powder can be yielded.

4. 发明专利

JPS6196539A Optical card 失效
标题翻译：光学卡片
公开(公告)号：JPS6196539A
公开(公告)日：1986-05-15
申请号：JP21798184
申请日：1984-10-17
申请人： Tdk Corp , Tokyo Jiki Insatsu Kk
发明人： AOI TOSHIKI , NANBA NORIYOSHI , HOSAKA HIROSHI , MIMURA SHOHEI
IPC分类号： B41M5/26 , B42D15/10 , G06K19/10 , G11B7/24
CPC分类号： G11B7/00
摘要： PURPOSE:To realize an optical card having high contrast and a high S/N by forming a void having >=0.01mm size between an optical recording layer and a protective layer with a spacer interposed between a substrate and a protective film. CONSTITUTION:A recording layer 3 consisting of a single pigment or a pigment composition is formed on a substrate 2 consisting of an acrylic resin, etc., a spacer 6 of polyester, etc. having 0.01-0.5mm thickness is placed on the recording layer 3, and a protective layer 4 is laminated thereon. Besides, a void 5 having >=0.01mm length is formed between the recording layer 3 and the protective layer 4. When the void 5 having >=0.01mm length is thus formed between the optical recording layer part and the protective layer, the contrast can be increased by 2 times as compared with the conventional one, and an optical card having a high S/N can be obtained.
摘要翻译：目的：通过在光记录层和保护层之间形成具有> = 0.01mm尺寸的空隙，通过在衬底和保护膜之间插入间隔来实现具有高对比度和高S / N的光卡。构成：在由丙烯酸树脂等构成的基板2上形成由单色颜料或颜料组合物构成的记录层3，厚度为0.01-0.5mm的聚酯等的间隔物6配置在记录层上 3，层叠有保护层4。此外，在记录层3和保护层4之间形成具有> = 0.01mm长度的空隙5.当在光记录层部分和保护层之间形成> = 0.01mm长度的空隙5时，对比度可以比常规的增加2倍，并且可以获得具有高S / N的光卡。

5. 发明专利

JPH0696917A MAGNETIC RECORDING MEDIUM, MAGNETIC POWDER THEREFOR, AND MAGNETIC RECORDING METHOD 失效
公开(公告)号：JPH0696917A
公开(公告)日：1994-04-08
申请号：JP27089192
申请日：1992-09-14
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： YONEYAMA TETSUTO , YAMAMOTO TOMOMI , MIMURA SHOHEI , TAKAHASHI HARUYUKI
IPC分类号： G11B5/84 , H01F1/047
摘要： PURPOSE:To obtain a magnetic recording medium composed of a rare-earth-Co- Ni-B alloy having a specific atomic ratio composition by manufacturing the medium by a high-speed quenching method and, at the same time, to give an excellent frequency characteristic to the medium by forming the medium in a thin belt having magnetic anisotropy in its intrasurface direction. CONSTITUTION:This medium is a thin belt-like magnetic recording medium manufactured by a high-speed quenching method and has an atomic ratio composition expressed by R(Co1-xNix)yBz (where, R, x, y, and z respectively represent one of more kinds of rare-earth metallic elements including Y, 0.05-0.5, and 1.8-5.5, 1.8-5.5, and 0.18-2.4) and magnetic anisotropy in its intrasurface direction. The medium contains >=50at.% Sm as the R. This invention relates to the magnetic recording medium containing magnetic powder prepared by grinding the magnetic medium and a magnetic layer in which the magnetic powder is scattered in a binder. In addition, this invention also relates to a magnetic recording method by which thermomagnetic recording or thermomagnetic transfer is performed by using the magnetic recording medium. Therefore, an excellent frequency characteristic can be obtained at 100-250 deg.C.

6. 发明专利

JPH03124003A MAGNETIC POWDER, MANUFACTURE THEREOF, MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING METHOD 失效
公开(公告)号：JPH03124003A
公开(公告)日：1991-05-27
申请号：JP26237789
申请日：1989-10-06
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： MORO EIJI , SATO SHIGEO , YONEYAMA TETSUTO , MIMURA SHOHEI , TAKAHASHI HARUYUKI , MAKIMURA ATSUSHI
IPC分类号： G06K19/06 , C09D5/23 , C09D7/12 , G11B5/706 , G11B5/842 , G11B11/10 , G11B11/105 , H01F1/11
摘要： PURPOSE:To acquire a magnetic recording medium of even frequency characteristics which is hard to erase after recorded using a magnetic powder having a good Curie point, high coercive force, high squareness ratio and stable properties by manufacturing and using a magnetic powder whose grain diameter and composition are specific. CONSTITUTION:Required materials are mixed, calcined, and ground by a vibrating mill, etc.; and burnt by an electric furnace, etc. Jet mill grinding is carried out to manufacture a magnetic powder of displacement M-type ferrite in a composition shown by an expression I, which is composed of a grain by 65% or more of an entire whose grain diameter is (0.5 to 5) X average grain diameter. Use of the magnetic powder of good Curie point, high coercive force, high squareness ratio and stable properties realizes a magnetic recording medium having even frequency characteristics which is hard to erase after recorded. In the expression, Me is one or more of Ba, Sr, Pb, Ca; and n, x, y: 4.5 =0, y>=0, x/3+y/4+z/6>=1/6, x/6+y/10+z/11

7. 发明专利

JPH02270121A THERMOMAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH02270121A
公开(公告)日：1990-11-05
申请号：JP9042389
申请日：1989-04-10
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： YONEYAMA TETSUTO , NISHIUCHI AKIHIRO , MIMURA SHOHEI , TAKAHASHI HARUYUKI
IPC分类号： G11B5/706 , C09D5/23 , C09D101/18 , C09D175/00 , C09D175/04 , G11B5/842 , H01F1/06
摘要： PURPOSE:To obtain a magnetic layer with which the output having good frequency characteristics is obtainable and which has a high coercive force and is hardly erasable by using a specific magnetic material having a low Curie point. CONSTITUTION:This recording medium has the magnetic layer contg. the magnetic material in a binder and the magnetic material has the compsn. expressed by formula I; in addition, the Curie point is specified to =1 kinds of rare earth elements including Y; M is >=1 kinds of T, V, Zr, Cr, Mn, Nb, Ta, Hf, W, Mo, Ni, Cu, and Zn; x, y and z denote atomic per cent and are 5

8. 发明专利

JPH0232599A MAGNETIC SHIELD MATERIAL 失效
公开(公告)号：JPH0232599A
公开(公告)日：1990-02-02
申请号：JP18249088
申请日：1988-07-21
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： SHIGETA MASAO , CHO TSUTOMU , SHIMIZU HIROZUMI , HIRAI KAZUNORI , MIMURA SHOHEI , MAKIMURA ATSUSHI , HOSAKA HIROSHI
IPC分类号： H05K9/00
摘要： PURPOSE:To improve the dispersibility of magnetic shield properties into a bonding agent by specifying not only the average thickness, the average aspect ratio, and the particle diameters of particles but also the kind of a bonding agent in the cases of flat, amorphous alloy soft magnetic particles which have a large shield effect on a magnetic field in the specific direction as well as magnetic shield materials consisting of the bonding agent. CONSTITUTION:Amorphous alloy soft magnetic particles having an average thickness 0.01-1mum is used as a magnetic powder and a bonding agent which cures radiation setting type compounds comprising an ethylenic double bond by radiation is used as a binder. Further, an aspect ratio of particles is more than 10 and respective diameters of the particles are distributed as follows: the particles having the diameters 10-50mum are in the amount of 35wt.% or more; those having diameters exceeding 88mum are 0.5wt.% or less; and those having diameters less than 3mum are 16wt.% or less. Moreover, an average ratio of long axes to short axes of the particles becomes 1.2 or more. This material is superior in magnetic shielding properties and the particles are hardened without taking a long time and the resultant magnetic shield material exhibits high resistance to weather and endurance.

9. 发明专利

JPH01175300A MAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPH01175300A
公开(公告)日：1989-07-11
申请号：JP33252687
申请日：1987-12-29
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： SHIGETA MASAO , CHO TSUTOMU , SHIMIZU HIROZUMI , HIRAI KAZUNORI , MIMURA SHOHEI , MAKIMURA ATSUSHI , HOSAKA HIROSHI
IPC分类号： H01F1/22 , B22F1/00 , H05K9/00
摘要： PURPOSE:To obtain magnetic shielding materials which are superior in magnetic shielding properties of in the direction parallel to a film face even though the thin film is formed of the material, by using magnetically-soft particles of amorphous alloy where average thickness and the ratio of an average outside diameter to an average thickness are specified. CONSTITUTION:Magnetically-soft particles of amorphous alloy to be used have flat forms generally and the average thickness thereof is 0.01-1mum. It is preferable that the numeric value 10-10000 is used as an average aspect ratio (the ratio of an average outside diameter to an average thickness). And it is also preferable that the particles having 10-50mum size come to 35wt.% or more of the whole magnetically soft particles and the particles whose sizes exceed 88mum come to 0.5wt.% or less of the whole powder as well and the particles whose sizes are less than 3mum come to 10wt.% or less. Further, when the maximum magnetic permeability in a D.C. magnetic field is supposed to be mum and the coercive force is supported to be Hc, the values are shown by the expressions: 15

10. 发明专利

JPH01139702A POWDER FOR MAGNETIC SHIELD, MAGNETIC SHIELD MATERIAL AND MANUFACTURE OF POWDER 失效
公开(公告)号：JPH01139702A
公开(公告)日：1989-06-01
申请号：JP32689487
申请日：1987-12-25
申请人： TDK CORP , TOKYO JIKI INSATSU KK
发明人： SHIGETA MASAO , CHO TSUTOMU , SHIMIZU HIROZUMI , HIRAI KAZUNORI , HOSAKA HIROSHI , MIMURA SHOHEI , MAKIMURA ATSUSHI
IPC分类号： B22F1/00 , B22F9/04 , C22C38/00 , G12B17/02 , H01F1/20
摘要： PURPOSE:To obtain powder for magnetic shield specifying average thickness and ratio of average outer diameter/average thickness by pulverizing alloy raw material blending the specific ratio of Fe, Cr and Si, B by using a high shearing force mill planting many pins and packing beads in there. CONSTITUTION:The alloy raw material shown with a composition by at.% of FeuCrxMy(Si, B, X)w (wherein, M: at least one element among Nb, Ti, V, W, Ta, Mo, Mn, Co and Ni, x: 2-10, y: 0-10, x+y: 3-10, w: 18-38, u: balance, X: at least one element of P and C, which may substitute at least a part of Si and B) is manufactured with high speed rapid cooling method, etc. This alloy is charged into the high shearing force mill planting many pins to facing surface inner and outer cylinder and packing the beads as pulverizing medium, and the shearing action is applied to this alloy for the prescribed time. By this method, the powder for magnetic shield composing of amorphous soft magnetized alloy particle having 0.01-0.5mum average thickness of the particles and 10-10000 the ratio of average outer diameter/average thickness is obtd.

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