Patents by Inventor Naoki Chida
Naoki Chida has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8044761Abstract: A varistor 1 comprises a varistor element 10, a pair of external electrodes 30a, 30b on one main side of the varistor element 10 and a resistor 60 on the same main side, wherein the resistor 60 is formed so as to connect the pair of external electrodes 30a, 30b. The varistor element 10 contains zinc oxide as the main component and Ca oxides, Si oxides and rare earth metal oxides as accessory components, wherein the proportion X of the calcium oxides in terms of calcium atoms is 2-80 atomic percent with respect to 100 mol of the main component and the proportion Y of the silicon oxides in terms of silicon atoms is 1-40 atomic percent with respect to 100 mol of the main component, X/Y satisfying formula (1) below, and the external electrodes and resistor contain oxides other than bismuth oxide and copper oxide 1?X/Y<3??(1).Type: GrantFiled: December 17, 2008Date of Patent: October 25, 2011Assignee: TDK CorporationInventors: Miyuki Yanagida, Koichi Yamaguchi, Katsuhiko Igarashi, Naoki Chida
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Patent number: 7995326Abstract: A chip-type electronic component has: a ceramic element body; a plurality of first and second internal electrodes arranged in the ceramic element body so as to be opposed at least in part to each other; a first external connection conductor to which the plurality of first internal electrodes are connected; a second external connection conductor to which the plurality of second internal electrodes are connected; first and second terminal electrodes; a first internal connection conductor arranged in the ceramic element body and connecting the first external connection conductor and the first terminal electrode; and a second internal connection conductor arranged in the ceramic element body and connecting the second external connection conductor and the second terminal electrode.Type: GrantFiled: May 21, 2009Date of Patent: August 9, 2011Assignee: TDK CorporationInventors: Kaname Ueda, Dai Matsuoka, Naoki Chida, Izuru Soma, Hisayoshi Saito, Katsunari Moriai
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Publication number: 20090296312Abstract: A chip-type electronic component has: a ceramic element body; a plurality of first and second internal electrodes arranged in the ceramic element body so as to be opposed at least in part to each other; a first external connection conductor to which the plurality of first internal electrodes are connected; a second external connection conductor to which the plurality of second internal electrodes are connected; first and second terminal electrodes; a first internal connection conductor arranged in the ceramic element body and connecting the first external connection conductor and the first terminal electrode; and a second internal connection conductor arranged in the ceramic element body and connecting the second external connection conductor and the second terminal electrode.Type: ApplicationFiled: May 21, 2009Publication date: December 3, 2009Applicant: TDK CORPORATIONInventors: Kaname Ueda, Dai Matsuoka, Naoki Chida, Izuru Soma, Hisayoshi Saito, Katsunari Moriai
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Patent number: 7576965Abstract: An object of the present invention is to provide a small surge absorption element that exhibits superior impedance matching even for high-speed signals and a surge absorption circuit. The surge absorption element comprises first and second inductor sections and first and second surge absorption sections. The first inductor section comprises first and second coils and the second inductor section comprises third and fourth coils. By suitably setting the coupling coefficients between the respective coils and the induction coefficients of the first to fourth coils, image impedance with an even frequency characteristic can be implemented over a wide area. Further, because the first to fourth coils have a positive magnetically coupled state with respect to one another, the induction coefficients of the first to fourth coils can be reduced in comparison with a case where the first to fourth coils are not afforded a positive magnetically coupled state.Type: GrantFiled: July 17, 2006Date of Patent: August 18, 2009Assignee: TDK CorporationInventors: Yuji Terada, Dai Matsuoka, Naoki Chida
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Publication number: 20090160600Abstract: A varistor 1 comprises a varistor element 10, a pair of external electrodes 30a, 30b on one main side of the varistor element 10 and a resistor 60 on the same main side, wherein the resistor 60 is formed so as to connect the pair of external electrodes 30a, 30b. The varistor element 10 contains zinc oxide as the main component and Ca oxides, Si oxides and rare earth metal oxides as accessory components, wherein the proportion X of the calcium oxides in terms of calcium atoms is 2-80 atomic percent with respect to 100 mol of the main component and the proportion Y of the silicon oxides in terms of silicon atoms is 1-40 atomic percent with respect to 100 mol of the main component, X/Y satisfying formula (1) below, and the external electrodes and resistor contain oxides other than bismuth oxide and copper oxide.Type: ApplicationFiled: December 17, 2008Publication date: June 25, 2009Applicant: TDK CorporationInventors: Miyuki YANAGIDA, Koichi Yamaguchi, Katsuhiko Igarashi, Naoki Chida
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Publication number: 20080308312Abstract: A ceramic electronic component comprises a ceramic element body and an outer electrode arranged on the ceramic element body. The outer electrode includes a first electrode layer and a second electrode layer formed on the first electrode layer. The first electrode layer is formed on an outer surface of the ceramic element body and contains Ag and a glass material. The second electrode layer contains Pt and has a plurality of holes reaching the first electrode layer at respective locations.Type: ApplicationFiled: June 3, 2008Publication date: December 18, 2008Applicant: TDK CORPORATIONInventors: Izuru SOMA, Naoki CHIDA, Dai MATSUOKA, Miyuki YANAGIDA
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Patent number: 7400485Abstract: A surge absorber has a first terminal electrode, a second terminal electrode, a third terminal electrode, an inductor portion, a surge absorbing portion, and a resistor portion. The inductor portion has a first internal conductor and a second internal conductor mutually coupled in a polarity-reversed relation. One end of the first internal conductor is connected to the first terminal electrode. One end of the second internal conductor is connected to the second terminal electrode. The other end of the first internal conductor is connected to the other end of the second internal conductor. The surge absorbing portion has a first internal electrode and a second internal electrode. The first internal electrode is connected to the other end of the first internal conductor and to the other end of the second internal conductor. The second internal electrode is connected to the third terminal electrode.Type: GrantFiled: August 11, 2006Date of Patent: July 15, 2008Assignee: TDK CorporationInventors: Naoki Chida, Yuji Terada, Koichi Ishii, Takeshi Yanata, Dai Matsuoka
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Publication number: 20070070569Abstract: A surge absorber has a first terminal electrode, a second terminal electrode, a third terminal electrode, an inductor portion, a surge absorbing portion, and a resistor portion. The inductor portion has a first internal conductor and a second internal conductor mutually coupled in a polarity-reversed relation. One end of the first internal conductor is connected to the first terminal electrode. One end of the second internal conductor is connected to the second terminal electrode. The other end of the first internal conductor is connected to the other end of the second internal conductor. The surge absorbing portion has a first internal electrode and a second internal electrode. The first internal electrode is connected to the other end of the first internal conductor and to the other end of the second internal conductor. The second internal electrode is connected to the third terminal electrode.Type: ApplicationFiled: August 11, 2006Publication date: March 29, 2007Applicant: TDK CorporationInventors: Naoki Chida, Yuji Terada, Koichi Ishii, Takeshi Yanata, Dai Matsuoka
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Publication number: 20070025043Abstract: An object of the present invention is to provide a small surge absorption element that exhibits superior impedance matching even for high-speed signals and a surge absorption circuit. The surge absorption element comprises first and second inductor sections and first and second surge absorption sections. The first inductor section comprises first and second coils and the second inductor section comprises third and fourth coils. By suitably setting the coupling coefficients between the respective coils and the induction coefficients of the first to fourth coils, image impedance with an even frequency characteristic can be implemented over a wide area. Further, because the first to fourth coils have a positive magnetically coupled state with respect to one another, the induction coefficients of the first to fourth coils can be reduced in comparison with a case where the first to fourth coils are not afforded a positive magnetically coupled state.Type: ApplicationFiled: July 17, 2006Publication date: February 1, 2007Applicant: TDK CorporationInventors: Yuji Terada, Dai Matsuoka, Naoki Chida
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Patent number: 5739914Abstract: A stimulus values direct reading colorimetric instrument comprising a plurality of photoelectric sensors having different spectral responsivities equal or approximately equal to color matching functions X(.lambda.), Y(.lambda.), and Z(.lambda.); and measuring and display device to measure and display the tri-stimulus values X,Y and Z and the chromaticity of the light to be measured by computing the photoelectric sensor output signals caused by the light, wherein the instrument calculates the stimulus values corresponding to the tri-stimulus values and measures the chomaticity by providing at least one corrective photoelectric sensors so as to maximize their spectral responsivities in the vicinity of the transmission threshold wavelengths of each sensor and taking the sum of the output signals from the sensors and the corrective sensor after multiplying each coefficient assigned to the signals by each output signal, respectively.Type: GrantFiled: November 12, 1996Date of Patent: April 14, 1998Assignee: Yokogawa Instrument CorporationInventors: Naoki Chida, Kenji Murakami