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71. 发明专利

JP2001230060A RESISTANCE ELEMENT 失效
公开(公告)号：JP2001230060A
公开(公告)日：2001-08-24
申请号：JP2000042642
申请日：2000-02-21
申请人： TDK CORP
发明人： SAWAMURA KENTARO
IPC分类号： H05B3/18 , H01C1/146 , H01C7/00 , H01C17/28 , H05B3/12 , H05B3/14
摘要： PROBLEM TO BE SOLVED: To provide a resistance element that can be used for a long time at an environment of high temperature and gives little fluctuation of resistance value even if used repeatedly in a circumstance of rising and falling temperature from room temperature to hot temperature or in reverse way and that has an excellent durability to tolerate oxidization at a high temperature. SOLUTION: The resistance element device comprises a resistance element body composed of a ceramics containing β-SIALON as expressed in formula; Si6-z Alz Oz N8-z (wherein z=0.3-1.0) and at least an internal conductor embedded in the above resistance element body. The above inner conductor contains tungsten and carbon, and is composed of a conductive material having an atomic ratio of carbon to tungsten of 0.4-1.1 and an insulating material, and has a volumetric ratio of the insulating material to the conductive material of 0.25-1.5.

72. 发明专利

JP2000286042A RESISTANCE ELEMENT 失效
公开(公告)号：JP2000286042A
公开(公告)日：2000-10-13
申请号：JP8775799
申请日：1999-03-30
申请人： TDK CORP
发明人： SAWAMURA KENTARO
IPC分类号： H05B3/20 , H05B3/14 , H05B3/18
摘要： PROBLEM TO BE SOLVED: To obtain a resistance element capable of being used for a long period under a high-temperature environment of 1,000 deg.C or higher (preferably 1,400 deg.C or higher), and having a small variation of a resistance value and excellent in durability, even if temperature increase from a room temperature to 1,000 deg.C or higher (preferably 1,400 deg.C or higher) and temperature reduction in the reverse direction are repeated. SOLUTION: In this resistance element 20 having a resistance element body 22 composed of ceramics containing zircon as a main component, and an inner conductor 14 embedded inside the resistance element body 22, the inner conductor 14 has a melting point of 1,700 deg.C or higher, a thermal expansion coefficient in the range from a room temperature to 800 deg.C of 4×10-6/ deg.C-6×10-6/ deg.C, and a resistivity of 10-5 Ωcm or less. The inner conductor 14 preferably contains one or more electric conductors selected from, for example, tungsten(W), tungsten carbide(WC, W2C), molybdenum(Mo) and chromium(Cr).

73. 发明专利

JP2000286039A RESISTANCE ELEMENT AND ITS MANUFACTURE 失效
公开(公告)号：JP2000286039A
公开(公告)日：2000-10-13
申请号：JP8775599
申请日：1999-03-30
申请人： TDK CORP
发明人： SAWAMURA KENTARO
IPC分类号： H05B3/06 , H05B3/18
摘要： PROBLEM TO BE SOLVED: To obtain an excellent in durability, easily-manufacturable and inexpensive resistance element capable of preventing the occurrence of a crack or the like, even if temperature increase from a room temperature to 1,000 deg.C or more and temperature reduction in the reverse direction are repeated. SOLUTION: This element has a resistance element body made of ceramics 22, an inner conductor 14 embedded inside the resistance element body 22, an external terminal electrode 24 installed on the rear end side of the resistance element body 22, for being connected to the inner conductor 14, lead wires 26 for being connected to the external terminal electrode 24, and an insulator comprising an inorganic adhesive, for covering integrally the rear end part of the resistance element body 22, the external terminal electrode 24, and the tip parts of the lead wires 26.

74. 发明专利

JPH11323408A PRODUCTION OF SUPER HARD SINTERED BODY TIP 失效
公开(公告)号：JPH11323408A
公开(公告)日：1999-11-26
申请号：JP12644898
申请日：1998-05-08
申请人： TDK CORP
发明人： SAWAMURA KENTARO
IPC分类号： B23B27/14 , B22F3/14 , B22F3/24 , B22F5/00
摘要： PROBLEM TO BE SOLVED: To provide a method for easily producing a tip having a desired shape from a super hard sintered body hard to cut without using a sintered hard tool such as a diamond cutter. SOLUTION: At the time of dividing a super hard planar sintered body and producing a tip having a required shape, at least on one side of a green sheet 1 for sintering, a heat resistant spacer 2 provided with projecting stripes having a projecting type cross-sectional shape is abutted, press sintering is executed, and after that, a planar sintered body having stripe grooves with the shape corresponding to the formed projecting stripes is separated along the stripe grooves.

75. 发明专利

JPH06244053A LAMINATED CERAMIC CAPACITOR 失效
公开(公告)号：JPH06244053A
公开(公告)日：1994-09-02
申请号：JP10960191
申请日：1991-04-16
申请人： TDK CORP
发明人： KOSAKA YOSHIO , SATO SHINICHI , SAWAMURA KENTARO , HIRAKATA KEIGO , UCHIKOBA FUMIO
IPC分类号： C04B35/46 , H01B3/12 , H01G4/12
摘要： PURPOSE:To achieve a laminated ceramic capacitor which does not degrade in resistance and remains highly reliable for a long time by using, as dielectric material, lead composite perovskite the oxygen vacancy of which has been substantially reduced by introducing oxygen after firing, and forming internal electrodes from copper. CONSTITUTION:Lead composite perovskite is used as dielectric material and internal electrodes are formed from copper to manufacture a laminated ceramic capacitor. After the lead composite perovskite is fired in a reducing atmosphere in the manufacture process, oxygen is introduced on the conditions expressed in the formulae (where Po2 is oxygen partial pressure (atmospheric pressure), T is processing temperature ( deg.C), and t is processing time (hr); however, 550

76. 发明专利

JPH06117636A IGNITION HEATING ELEMENT 失效
公开(公告)号：JPH06117636A
公开(公告)日：1994-04-28
申请号：JP28687792
申请日：1992-09-30
申请人： TDK CORP
发明人： SAWAMURA KENTARO , KITAJIMA MASAHIRO , YODOGAWA MASATADA
IPC分类号： F23Q7/00
摘要： PURPOSE:To make it to conform with the mass production and manufacture at a low cost by installing a heating element which consists of a high resistor or a material under lamination structure laminated with an insulator and a conductor, and which is a conductor-built-in sintered body where the conductor is connected to a lead in one piece. CONSTITUTION:A heating element 1 is manufactured by cutting and burning a laminated raw sheet or a material formed under lamination structure by a printing process. An upper part conductor 3 and a lower part conductor 5 provide lead wires 3a and 5a, which are wider and designed to reduce their resistance and heating elements 3b and 5b which are narrower and designed to increase their resistance. A conductor 4 in the middle comprises a narrow heating element 4a and conductor connection pads 4b and 4c in a through hole whose line width is increased. The latter is connected to the pads 3d and 5d of the conductors 3 and 5 by way of the conductors 6 and 7 filled up in the through hole. This constitution makes it possible to reduce the manufacturing cost since the mass production is available by producing in great quantity and no work is required after burning.

77. 发明专利

JPH05290625A 失效
公开(公告)号：JPH05290625A
公开(公告)日：1993-11-05
申请号：JP12144792
申请日：1992-04-14
申请人： TDK CORP
发明人： UCHIKOBA FUMIO , SAWAMURA KENTARO
IPC分类号： C01G23/04 , C01G33/00 , C01G41/02 , H01B3/12 , H01G4/12
摘要： PURPOSE:To significantly reduce change in the dielectric constant of a lead- combined perovskite dielectric material due to temperature without significantly lowering the dielectric constant. CONSTITUTION:In a lead-combined perovskite dielectric porcelain composition, Pb(Mg1/3Nb2/3) O3-PbTiO3--Pb(Mg1/2W1/2)O3, WO3 is added by 1 to 10 parts by weight as additive to the main composition with the ranges of composition points as follows: A=(50, 30, 20), B=(40, 40, 20), C=(30, 40, 30), D=(30, 30, 40), E=(40, 20, 40) and F=(50, 20, 30). A core-shell structure of W and Nb is formed within the perovskite crystal grain.

78. 发明专利

JPH0590066A MANUFACTURE OF DIELECTRIC FOR LAMINATED CAPACITOR 失效
公开(公告)号：JPH0590066A
公开(公告)日：1993-04-09
申请号：JP8924991
申请日：1991-03-29
申请人： TDK CORP
发明人： HIRAKATA KEIGO , UCHIKOBA FUMIO , KOSAKA YOSHIO , SATO SHINICHI , SAWAMURA KENTARO
IPC分类号： H01G4/12
摘要： PURPOSE:To obtain a dielectric which gives a high quality laminated ceramic capacitor by conducting burn-out within the specific condition in the mixed gas atmosphere of hydrogen, vapor and nitrogen. CONSTITUTION:Burn-out is conducted in a mixed gas atmosphere of hydrogen, vapor and inactive gas on the occasion of manufacturing a dielectric for laminated capacitor consisting of a lead type composite perovskite by conducting the temporary baking, milling, molding, burn-out and baking processes to a mixture of raw materials. In this case, hydrogen concentration in the mixed gas is kept within the range from 0.01 to 1000ppm in the temperature range from room temperature to 600 deg.C and a logarithmic value log[hydrogen/vapor] of mol ratio of hydrogen and vapor in the atmosphere is controlled to be in the range between -8 and -2. Thereby, a laminated ceramic capacitor not resulting in the drawbacks that a relative dielectric constant due to residual carbon is lowered and operation life is curtailed by diffusion of copper oxide can be achieved.

79. 发明专利

JPH04317311A LAMINATED CERAMIC CAPACITOR 失效
公开(公告)号：JPH04317311A
公开(公告)日：1992-11-09
申请号：JP10967891
申请日：1991-04-16
申请人： TDK CORP
发明人： SATO SHINICHI , SAWAMURA KENTARO , HIRAKATA KEIGO , UCHIKOBA FUMIO , KOSAKA YOSHIO
IPC分类号： H01G4/008 , H01G4/12
摘要： PURPOSE:To provide a copper group inside electrode material for a plumbum group composite perovskite type laminated ceramic capacitor which is so improved as to provide an excellent quality laminated capacitor in which electrode cutting is not produced at a high coating rate and electrostatic capacitance is greater due to a greater occupation area and the like, and the plumbum group composite perovskite type laminated ceramic capacitor with employment thereof. CONSTITUTION:An electrode material includes an alkali earth metal oxide or a compound producing the alkali earth metal oxide at 0.01 to 10wt.% with respect to copper of a main component in terms of the alkali earth metal oxide. Further, a laminated ceramic capacitor has an inside electrode comprising the electrode material and plumbum group composite perovskite is used as a dielectric.

80. 发明专利

JPH04317310A LAMINATED CERAMIC CAPACITOR 失效
公开(公告)号：JPH04317310A
公开(公告)日：1992-11-09
申请号：JP10967191
申请日：1991-04-16
申请人： TDK CORP
发明人： SAWAMURA KENTARO , HIRAKATA KEIGO , UCHIKOBA FUMIO , KOSAKA YOSHIO , SATO SHINICHI
IPC分类号： H01G4/008 , H01G4/12 , H01G4/228 , H01G4/30
摘要： PURPOSE:To suppress electrode cutting, a reduction of an insulating resistance, a reduction of electrostatic capacitance, and a deterioration of a product strength due to a plumbum compound and the like and improve an adhesive strength in a laminated ceramic capacitor which has a copper group terminal electrode and a copper group inside electrode and in which plumbum group composite perovskite is a dielectric. CONSTITUTION:A terminal electrode is used which has metallic copper as a main component, and a compound producing 0.01 to 5wt.% of an alkali earth metal oxide or an alkali earth metal oxide with respect to the metallic copper as a sub-component.

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