专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明专利

JP2002128570A MANUFACTURE OF GRANULES FOR FORMING CERAMICS AND EQUIPMENT THEREOF, AND GRANULES, SHAPED COMPACT AND SINTERED COMPACT 失效
公开(公告)号：JP2002128570A
公开(公告)日：2002-05-09
申请号：JP2000316030
申请日：2000-10-17
申请人： TDK CORP
发明人： HARADA HIROSHI
IPC分类号： B01J2/16 , C04B35/628
摘要： PROBLEM TO BE SOLVED: To provide ceramic granules for forming ceramics, which have excellent flowability, packability into a metal mold, demoldability and crushability under low load, and sintered compacts with less defects using them. SOLUTION: A ceramic slurry is granulated by feeding it to a spray- granulator, where the temperatures of slurry inlet and granule outlet are controlled at 170-230 deg.C and 65-125 deg.C, respectively.

22. 发明专利

JP2001060507A GRAIN FOR FERRITE MOLDING AND MOLDING THEREOF 失效
公开(公告)号：JP2001060507A
公开(公告)日：2001-03-06
申请号：JP23646399
申请日：1999-08-24
申请人： TDK CORP
发明人： HARADA HIROSHI
IPC分类号： H01F1/36 , B01J2/28 , C04B35/622 , C04B35/632 , H01F1/113
摘要： PROBLEM TO BE SOLVED: To decrease abrasion a tool and prevent chipping of a ferrite molding due to shocks of tool and lowered surface accuracy of the tooling surface by mixing a ferrite raw material powder, polyvinyl alcohol as a binder, and polyethylene glycol of a specific molecular weight as a plasticizer to granulate. SOLUTION: Granules for ferrite molding comprise a ferrite raw material powder, polyvinyl alcohol as a binder, and polyethylene glycol(PG) of a molecular weight of 1,000 to 6,000 to be added as a plasticizer to be mixed and granulated, even when the molecular weight of the PG is 1,000, no chippings or damages occur for continuous grinding of up to 100,000 or 200,000 pieces. Therefore the molecular weight of the PG is desirably 1,000 or more. When the molecular weight of the PG is 6,000, no chippings or damages occur for grinding up to 200,000 pieces. When the molecular weight of the PG is 10,000, the chipping occurs at continuous grinding of 30,000 pieces. Therefore, the molecular weight of the PG is desirable 6,000 or less.

23. 发明专利

JP2001057309A OXIDE MAGNETIC MATERIAL, AND MANUFACTURE THEREOF CHIP COMPONENT, AND MANUFACTURE THEREOF 失效
公开(公告)号：JP2001057309A
公开(公告)日：2001-02-27
申请号：JP23241299
申请日：1999-08-19
申请人： TDK CORP
发明人： ITO KO , TAKAHASHI YUKIO , ONO TAKUYA , HARADA HIROSHI
IPC分类号： H01F1/34 , H01F27/00 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To enable firing of an oxide magnetic material simultaneously with that of an Ag conductor, which is used as an internal conductor, to hold the sintering property of the material and the magnetic permiability of the material, and also shorten the pulverization time of the material. SOLUTION: This material contains a composition consisting of a Fe2O3, a ZnO, a CuO and an NiO as its main component. A Y2O3 of 0.003 to 0.021 wt.% of a content to the total quantity of the material is contained in this main component, and a ZrO2 of 0.06 to 0.37 wt.% of a content to the total quantity is contained in the main component. The Y2O3 and the ZnO2 are made to mix in the material when the material is pulverized due to the wear of partially stabilized zirconia balls.

24. 发明专利

JP2000323320A MANUFACTURE OF SOFT MAGNETIC FERRITE POWDER AND MANUFACTURE OF LAMINATED CHIP INDUCTOR 失效
公开(公告)号：JP2000323320A
公开(公告)日：2000-11-24
申请号：JP2000044832
申请日：2000-02-22
申请人： TDK CORP
发明人： HARADA HIROSHI
IPC分类号： H01F1/34 , C01G49/00
摘要： PROBLEM TO BE SOLVED: To provide a method capable of manufacturing Ni-Cu-Zn ferrite powder excellent in sintering property at a low temperature, and a method for manufacturing a laminated chip inductor by using the ferrite powder. SOLUTION: In a method manufacturing soft magnetic ferrite powder whose main component is Fe, Ni, Cu and Zn, a process wherein organic additive is made to exist in slurry containing a calcinated object of material powder and water is installed. As the organic additive, organic compound having hydroxyl group and carboxyl group, or neutralization salt of the organic compound, or lactone of the organic compound is used. As another way, organic compound having hydroxymethyl carbonyl group, or organic compound having enol type hydroxyl group which can be dissocitated as acid, or neutralization salt of the organic compound is used.

25. 发明专利

JPH06302467A DIELECTRIC PORCELAIN COMPOSITION AND MULTILAYER CERAMIC CAPACITOR USING DIELECTRIC PORCELAIN COMPOSITION 失效
公开(公告)号：JPH06302467A
公开(公告)日：1994-10-28
申请号：JP8954993
申请日：1993-04-16
申请人： TDK CORP
发明人： KOBAYASHI AKIRA , TAKAHARA WATARU , ISHIGAKI KOUYA , HARADA HIROSHI
IPC分类号： H01G4/12
摘要： PURPOSE:To obtain a multilayer ceramic capacitor which can ensure a sufficient electrostatic capacity even under high-temperature surroundings without increasing the number of laminates. CONSTITUTION:A multilayer capacitor is constituted of a dielectric porcelain composition which contains 0.75 to 0.5mol of MnO and 0.05 to 0.5mol of Y2O3 with reference to 100mol of BaTiO3 and, in addition, of a dielectric porcelain composition which contains 4.6mol or higher of at least one kind out of Al2O3 and SiO2. The permittivity of the compositions has a maximum value between 85 and 125 deg.C, the permittivity has a high value by 15% of higher as compared with that at room temperature, and the permittivity at room temperature is 2000 or higher. It is desirable to use BaCO3 at a purity of 97.1% or higher and TiO2 at a purity of 97.5% or higher as starting raw materials.

26. 发明专利

JPH06176955A PORCELAIN ELECTRONIC PARTS AND METHOD OF FABRICATION THEREOF 失效
公开(公告)号：JPH06176955A
公开(公告)日：1994-06-24
申请号：JP35132292
申请日：1992-12-07
申请人： TDK CORP
发明人： HARADA HIROSHI , ISHIGAKI TAKAYA
IPC分类号： H01G4/12 , H02K13/00 , H02K23/66
摘要： PURPOSE:To provide a porcelain electronic part and a method of fabrication thereof wherein the cost of formation of an electrode is inexpensive with many elements capable of being taken out from the same assembly porcelain substrate, and a lead electrode can securely be positioned upon its formation. CONSTITUTION:A porcelain substrate 1 has an outer periphery configured into a polygonal flat plate. A hole 2 is formed substantially at the center of the porcelain substrate 1 penetrating the same in a thickness direction thereof. Internal electrodes 31-33 are buried in the porcelain substrate 1 to construct a plurality of electric circuits, and are mutually independently led out along an inner peripheral surface of the hole 2 for each electric circuit. Lead electrodes 41-43 are provided on the inner peripheral surface of the hole 2 mutually independently for each electric circuit, and are communicated with the internal electrodes 31-33.

27. 发明专利

JPH04144973A METHOD FOR BURNING CERAMIC ELECTRONIC PART, BURNING FURNACE AND APPARATUS FOR BURNING 失效
公开(公告)号：JPH04144973A
公开(公告)日：1992-05-19
申请号：JP26741690
申请日：1990-10-04
申请人： TDK CORP
发明人： HARADA HIROSHI
IPC分类号： C04B35/64
摘要： PURPOSE:To obtain a burned product of constant quality without any dispersion by loading ceramic electronic parts onto loading parts of setters arranged in a burning furnace and burning the aforementioned parts while leading a gas from the outside through specific routes into the loading parts. CONSTITUTION:A burning furnace is provided with a burning chamber 4 having a hearth 6, a pedestal plate 7 and setters 8 and the burning chamber 4 is divided into the upper and lower parts with the hearth 6 to form the upper chamber 41 and the lower chamber 42. A communicating hole 61 for communicating the upper chamber 41 with the lower chamber 42 is simultaneously formed. Ceramic electronic parts are loaded onto loading parts 81 of the setters 8 and burned while passing a gas introduced from the outside of the burning furnace through an introduction passage 12 into the lower chamber 42 through the communicating hole 61, a through-hole 71 formed in the pedestal plate 7 and passages 82 provided in the setters 8 and leading the gas to the loading parts 81 of the setters 8. The aforementioned burning method is especially effective in burning the ceramic electronic products having a base metallic conductor (e.g. copper or nickel).

28. 发明专利

JPH0440471A MAGNETIC CARRIER PARTICLE FOR ELECTROPHOTOGRAPHIC DEVELOPMENT 失效
公开(公告)号：JPH0440471A
公开(公告)日：1992-02-10
申请号：JP14835790
申请日：1990-06-06
申请人： MITA INDUSTRIAL CO LTD , TDK CORP
发明人： TSUYAMA KOICHI , HARADA HIROSHI
IPC分类号： G03G9/107 , G03G9/113
摘要： PURPOSE:To contrive the improvement in durability by controlling the saturated magnetization of a cored ferrite and the particle distribution, selecting a specific copolymer as a composition of a copolymer for covering with a resin and controlling the resistivity. CONSTITUTION:As for the magnetic carrier particles, a surface of the magnetic particle is covered with the resin, and the main component of the cover with the resin is an acryl-styrene copolymer in which ethyl-methacrylate constitutes a copolymer with a non-substituted styrene monomer. The styrene contents in the copolymer are 15-25 wt.% and in the copolymer a dedecyl-methacrylate is incorporated whose dedecyl-methacrylate contents are preferably 0.1-2 wt.%. Also in the copolymer, 2-hydroxyethyl acrylate is incorporated and the contents are preferably OMEGA. Thus, the durabil ity is enhanced.

29. 发明专利

JPS6165406A Magnetic fluid 失效
标题翻译：磁性液体
公开(公告)号：JPS6165406A
公开(公告)日：1986-04-04
申请号：JP18716484
申请日：1984-09-06
申请人： Tdk Corp
发明人： WAKAYAMA KATSUHIKO , HARADA HIROSHI
IPC分类号： C10M105/04 , C10M169/04 , C10N10/16 , C10N20/06 , C10N30/04 , C10N40/14 , H01F1/44
CPC分类号： H01F1/442
摘要： PURPOSE:To obtain the magnetic fluid comprising high saturation magnetization by composing the magnetic fluid by use of metallic particles of cobalt, phosphorous lipide as a surface active agent, and a mixed substance of paraffic and olefin group as a medium of hydrocarbon group. CONSTITUTION:Metallic particles of cobalt of 70-120Angstrom and phosphorous lipide such as lecithin as an ionic surface active agent are used and are dispersed into a hydrocarbon medium stably. The surface active agent of about 60-250wt% of the metallic particles is added. For the hydrocarbon used as a medium, one that has the number of carbon atoms of 7-22 is preferable and the mixed substance of paraffin and olefin, e.g., kerosine is suitable. The hydrocarbon medium is included by 100-4,700wt% of the metallic particles. Nextly metal carbonyl is added to the hydrocarbon medium in which the surface active agent is dissolved and the mixed solution is heated to effect thermal decomposition of metal carbonyl.
摘要翻译：目的：通过使用钴的金属颗粒，作为表面活性剂的磷脂，以及作为烃基的介质的配对物和烯烃基的混合物构成磁性流体，来获得包含高饱和磁化强度的磁性流体。构成：使用70-120埃的钴的金属颗粒和磷脂如卵磷脂作为离子表面活性剂，并稳定地分散在烃介质中。加入约60-250重量％的金属颗粒的表面活性剂。对于用作介质的碳氢化合物，碳原子数为7-22的烃是优选的，并且石蜡和烯烃（例如煤油）的混合物质是合适的。烃介质包括100-4,700wt％的金属颗粒。接着将金属羰基加入到其中溶解表面活性剂的烃介质中，并加热混合溶液以实现金属羰基的热分解。

30. 发明专利

JP2002321984A MANUFACTURING METHOD OF FERRITE GRANULE FOR FORMING AND THE GRANULE, FORMED COMPACT AND SINTERED COMPACT 失效
公开(公告)号：JP2002321984A
公开(公告)日：2002-11-08
申请号：JP2001131470
申请日：2001-04-27
申请人： TDK CORP
发明人： HARADA HIROSHI
IPC分类号： C04B35/622 , C04B35/628 , C04B35/632
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method of ferrite granules having an excellent flowability, moldability into a mold, sticking resistance, and resistance to crushing at a low pressure. SOLUTION: A ferrite slurry prepared by mixing at least ferrite raw powder, an ethylene-modified polyvinyl alcohol with ethylene-modified quantity of 4-10 mol.%, average degree of polymerization of 500-1,700, and average degree of saponification of 90.0-99.5 mol.%, and water as a solvent is granulated by a spray granulator to form the granules, where the temperatures at the inlet and outlet of the spray granulator are controlled to be at 170-230 deg.C and 65-125 deg.C, respectively.

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