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81. 发明专利

JPH08162305A MANUFACTURE OF NONLINEAR RESISTOR 失效
公开(公告)号：JPH08162305A
公开(公告)日：1996-06-21
申请号：JP29873294
申请日：1994-12-02
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： IIDA KEN , OGITA KIYOBUMI , HIKOSAKA MASANOBU , NAKADA NORIAKI
IPC分类号： C04B35/453 , H01C7/10
摘要： PURPOSE: To provide a nonlinear resistor degreased sufficiently and excellent in the nonlinear characteristic such as a discharge withstand current rating, etc. CONSTITUTION: A nonlinear resistor is manufactured by obtaining a molded substance, granulating raw material powder mainly composed of zinc oxide and performing molding to obtain a molded substance, calcining this molded substance and performing primary sintering, and forming insulating layers on the side walls of the molded substance calcined. In the calcining process, the temperature of the molded substance is raised to 500-700 ( deg.C) at a temperature raising speed of 20-60 ( deg.C/hour), and that temperature is kept for about 2-3 hours. After that, it is raised up to 850-950 deg.C at a temperature raising speed of 40-80 ( deg.C/hour) and its temperature is kept for a specified time. Furthermore, it is cooled up to a room temperature at a temperature lowering speed of 40-80 ( deg.C/hour) in the calcining process. It is desirable that the oxygen concentration inside a calcining furnace should be at least 6%.

82. 发明专利

JP2000243607A MANUFACTURE OF NONLINEAR RESISTOR 失效
公开(公告)号：JP2000243607A
公开(公告)日：2000-09-08
申请号：JP3932399
申请日：1999-02-18
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： IIDA KEN
IPC分类号： H01C17/06 , H01C7/10
摘要： PROBLEM TO BE SOLVED: To improve an electric characteristics while a manufacturing cost is reduced. SOLUTION: The manufacturing method of a nonlinear resistor includes a step in which a material slurry obtained by mixing zinc oxide, slurry of additives, and organic binder is degassed and sprayed with a spray dryer for drying, obtaining pelletizing powder (S1). The pelletizing powder is molded into a disc-like mold (S2), and is temporarily baked for degreasing to provide a temporarily baked body (S3). A mixture slurry obtained by crushing and mixing ZnO, Bi2O3, Sb2O3, and SiO2 is supplied to a rotary kiln, dried and roasted during the crushing to provide an insulating powder, and a first insulating material obtained by kneading the insulating powder and organic binder is coated on a desired part of the temporarily baked body (S4). Then, the temporarily baked body is baked to provide a baked body where a high-resistance layer is formed (S5). The high resistance layer is coated with a second insulating material (S6) for thermal treatment (S7), and an electric material is thermally sprayed to both end surfaces of the baked body (S8) to complete a nonlinear resistor.

83. 发明专利

JPH0845708A LAMINATING METHOD OF VOLTAGE NON-LINEAR RESISTOR 失效
公开(公告)号：JPH0845708A
公开(公告)日：1996-02-16
申请号：JP17785094
申请日：1994-07-29
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： TAGAMI YUKIO , OGITA KIYOBUMI , IIDA KEN
IPC分类号： H01C7/10
摘要： PURPOSE:To provide a laminating method capable of enhancing the bonding properties of a terminal metal, ZnO element and between ZnO elements while decreasing the rate of destruction in discharge breakdown strength test, etc., as well as cutting down the assembling cost. CONSTITUTION:A laminating method by insertion fixing metallic rings 7 or metallic spacers using epoxy base conductive bonding agent 6 containing Ag particles interposed between (ZnO element abd ZnO element) and between (ZnO element abd terminal metal) is provided. As for the metallic rings 7, aluminum or stainless steel having a pressure relieving port is used while as for the metallic spacers, aluminum or stainless steel provided with margin for bonding agent having the pressure relieving port is used. Furthermore, after coating the ZnO element with a conductive bonding agent, the metallic rings or the metallic spacers are laminated with the other ZnO element and the terminal metal 5 and then junction-fixed under pressure.

84. 发明专利

JPH05326207A MANUFACTURE OF PTC RESISTOR 失效
公开(公告)号：JPH05326207A
公开(公告)日：1993-12-10
申请号：JP13407392
申请日：1992-05-27
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： OGITA KIYOBUMI , IIDA KEN
IPC分类号： H01C7/02 , H01C17/00
摘要： PURPOSE:To realize manufacture of PTC resistor for stably supplying PTC resistors having excellent PTC characteristics. CONSTITUTION:Material powder containing vanadium oxide and an additive component for deriving nonlinearity is admixed and then molded and baked. At that time, average grain size of material powder is set in the range of 0.1-3.0mum thus manufacturing a PTC resistor. The powder material is preferably wet ground and blended.

85. 发明专利

JP2001076904A MANUFACTURE OF VOLTAGE NONLINEAR RESISTIVE ELEMENT 失效
公开(公告)号：JP2001076904A
公开(公告)日：2001-03-23
申请号：JP25243799
申请日：1999-09-07
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： TAGAMI YUKIO , IIDA KEN , TSUGE NAOHITO
IPC分类号： H01C7/10
摘要： PROBLEM TO BE SOLVED: To obtain superior electrical characteristics of a ZnO element by preventing peeling-off of a sintered body from an aluminum electrode, simplifying a manufacturing line, and making working atmosphere satisfactory. SOLUTION: In this manufacturing method, zinc oxide, additive component and organic binder are mixed and dried to obtain granulated powder (S11), the granulated powder is molded into a disc molded body (S12), and the molded body is calcined to obtain a calcined body (S13). Then a solvent medium obtained by dissolving antimony trioxide, nickel oxide and silicon dioxide, etc., in an organic binder is applied to an outer peripheral surface of the calcined body (S14), and a sintered body (S15), in which a ceramic insulating layer is formed on the outer peripheral surface of the calcined body, is obtained by baking. After this, the sintered body is polished (S16), and aluminum paste is screen-printed on both end surfaces of the sintered body (S17), and baked to provide an aluminum electrode (S18), thereby a voltage nonlinear resistive element is manufactured.

86. 发明专利

JPH08172002A MANUFACTURE OF VOLTAGE NONLINEAR RESISTOR 失效
公开(公告)号：JPH08172002A
公开(公告)日：1996-07-02
申请号：JP31281594
申请日：1994-12-16
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： TAGAMI YUKIO , IIDA KEN , OGITA KIYOBUMI
IPC分类号： C04B35/453 , C08K3/00 , C08L63/00 , H01C7/10
摘要： PURPOSE: To improve the creeping dielectric strength of a ZnO element by improving the composition of a side-face insulating material applied to the side face of the element during the manufacturing process of the element. CONSTITUTION: The side-face insulating material of a ZnO element is formed in a two-layer structure by applying a ceramic insulating material 2 to the side face of the element and, after heat-treating the material 2, applying an epoxy resin insulating material 3 containing ceramic fibers and curing the material 3. The material 2 is composed of ZnO, BiO3 , Sb2 O3 , or SiO2 and the ceramic fibers are made of at least one kind selected from among Al2 O3 , SiO2 , ZrO2 , TiO2 , or Fe2 O3 . The epoxy resin 3 is a bisphenol-based liquid epoxy resin and the ratio of component of the ceramic fibers to the bisphenol-based liquid epoxy resin is adjusted to 0-75 (wt.%).

87. 发明专利

JPH08138911A MANUFACTURE OF VOLTAGE NON-LINEARITY RESISTOR 失效
公开(公告)号：JPH08138911A
公开(公告)日：1996-05-31
申请号：JP27687394
申请日：1994-11-11
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： NAKADA NORIAKI , OGITA KIYOBUMI , IIDA KEN , HIKOSAKA MASANOBU
IPC分类号： C04B35/453 , C04B35/64 , H01C7/10
摘要： PURPOSE: To decrease limited voltage and to reduce the protection level as a lightning arrester by a method wherein the reaction product, obtained by temporarily firing the mixture of ZnO, B2 O3 , SiO2 , Al(NO3 )3 and 9H2 O, is used as an additional component. CONSTITUTION: The second subsidiary additive component is obtained by mixing ZnO (40 to 80mol%), B2 O3 (10 to 40mol%), SiO2 (5 to 25mol%), and Al(NO3 )3 .9H2 O (0.003 to 0.006mol% in terms of Al) is added to the above-mentioned component. After this mixture has been wet-pulverized, the pulverized material is dried up, temporarily fired at 850 deg.C or higher, finely ground, and a reaction product is obtained. Besides, it is desirable that the blending ratio of the adding component is set at 0.05 to 0.5wt.% against the main raw material of zinc oxide. As a result, limited voltage is attenuated, and the protection level as a lightning arrester can be lowered.

88. 发明专利

JPH0997706A METHOD OF MANUFACTURING NON-LINEAR RESISTOR 失效
公开(公告)号：JPH0997706A
公开(公告)日：1997-04-08
申请号：JP25218895
申请日：1995-09-29
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： OGITA KIYOBUMI , NAKADA NORIAKI , HIKOSAKA MASANOBU , TAGAMI YUKIO , IIDA KEN
IPC分类号： C04B35/64 , H01C7/10 , H01C17/10
摘要： PROBLEM TO BE SOLVED: To increase the discharge breakdown strength for avoiding dielectric breakdown. SOLUTION: Zinc oxide, additive slurry and organic binder as the main materials are mixed up with one another (S1) to produce granulating particles by spray-drying step after deforming step (S2), after disc molding step (S3) further to be calsinated for the formation of a calsined body (S4). Next, the side of the calsined body is coated with the first insulating material formed by mixing zinc oxide, bismuth oxide, antimony oxide, silicon oxide, etc., with organic binder and organic solvent so as to form the first insulating layer (S5) for baking for 10 hours (S6). Later, after heat treatment (S7), the surface of the first insulating layer is evenly coated with an epoxy varnish using a roll coater to form the second insulating layer (S8). Finally, the whole body is baked at the temperature of 180 deg.C for 10min to produce a baked body (S9) for smoothly polishing the surface and backside of the baked body to flame-coat them with an aluminum electrode material for the completion of the title non-linear resistor.

89. 发明专利

JPH08138909A MANUFACTURE OF VOLTAGE NON-LINEARITY RESISTOR 失效
公开(公告)号：JPH08138909A
公开(公告)日：1996-05-31
申请号：JP27687094
申请日：1994-11-11
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： OGITA KIYOBUMI , TAGAMI YUKIO , IIDA KEN
IPC分类号： C04B35/453 , H01C7/10
摘要： PURPOSE: To enhance a discharge withstand current rating and the yield of production in the manufacture of a voltage non-linearity resistor by suppressing the generation of internal voids. CONSTITUTION: Manganese and cobalt, which are non-linear induction components, are added to the raw material powder which is mainly composed of zinc oxide, and a voltage non-linearity resistor is manufactured by molding and firing the above-mentioned mixture. At this time, Cox Mny Oz is grown in advance, and manganese and cobalt are added by mixing the above-mentioned compound and the raw material powder. It is desirable that the value of x/y in Cox Mny Oz is set at 1 to 5. Also, it is desirable that the Cox Mny Oz of 3.0μm or smaller in grain diameter is added to the raw material powder.

90. 发明专利

JPH06349607A MANUFACTURE OF VOLTAGE NONLINEAR RESISTOR 失效
公开(公告)号：JPH06349607A
公开(公告)日：1994-12-22
申请号：JP13419893
申请日：1993-06-04
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： OGITA KIYOBUMI , IIDA KEN
IPC分类号： H01C7/10
摘要： PURPOSE:To improve the lightning impulse discharge withstand current rating of a voltage nonlinear resistor by a method wherein a slurry obtained by grinding an inorganic insulating material raw material is dried using a medium fluid system dryer. CONSTITUTION:Pure water is added to an insulating material raw material consisting of zinc oxide, silicon oxide, bismuth oxide or the like and the raw material is ground by a TRON mill. This slurry obtained by grinding is sent to a medium fluid system drying device main body 1 by a roller pump 3 while being stirred in a raw material tank 2, the slurry is sprayed on a multitude of medium balls 5 flowing while being heated with hot air from a hot-air machine 4 to dry the balls and dried powder is recovered from a product recovery device 6. Calcinated powder obtained by calcining this dried powder is ground and an organic solvent and a binder are added to the ground powder to knead. This kneaded material is applied on the side surfaces of a resistor element as an insulating material and is calcined at a temperature of 1000 to 1300 deg.C to form an insulating layer. After glass is applied and calcined on this insulating layer, both end surfaces of the resistor element are polished and aluminium electrodes are respectively sprayed thereof.

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