Patents by Inventor Takeshi Okumura
Takeshi Okumura 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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Publication number: 20090284340Abstract: A common mode filter is provided as one in a three-layered structure with improved high-frequency characteristics. The common mode filter 1 has the three-layered structure including a first coil layer 14, a second coil layer 18, and a lead layer 16. A first planar coil 21 and a second planar coil 41 of a substantially circular spiral shape are formed in the first and second coil layers 14, 18, respectively. A first lead wire 31 and a second lead wire 32 formed in a lead layer 16 have a first straight portion 31c and a second straight portion 32c, respectively. The first straight portion 31c is located on a straight line L1 perpendicular to a plurality of first tangent lines to spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42. The second straight portion 32c is located on a straight line L2 perpendicular to a plurality of second tangent lines to the spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42.Type: ApplicationFiled: May 11, 2009Publication date: November 19, 2009Applicant: TDK CORPORATIONInventors: Tomonaga NISHIKAWA, Tomokazu ITO, Takeshi OKUMURA, Makoto YOSHIDA, Hiroshi KAMIYAMA, Sho NAKAGOMI, Tatsuya KARAKAME
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Patent number: 7619500Abstract: A common mode filter is provided as one in a three-layered structure with improved high-frequency characteristics. The common mode filter 1 has the three-layered structure including a first coil layer 14, a second coil layer 18, and a lead layer 16. A first planar coil 21 and a second planar coil 41 of a substantially circular spiral shape are formed in the first and second coil layers 14, 18, respectively. A first lead wire 31 and a second lead wire 32 formed in a lead layer 16 have a first straight portion 31c and a second straight portion 32c, respectively. The first straight portion 31c is located on a straight line L1 perpendicular to a plurality of first tangent lines to spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42. The second straight portion 32c is located on a straight line L2 perpendicular to a plurality of second tangent lines to the spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42.Type: GrantFiled: May 11, 2009Date of Patent: November 17, 2009Assignee: TDK CorporationInventors: Tomonaga Nishikawa, Tomokazu Ito, Takeshi Okumura, Makoto Yoshida, Hiroshi Kamiyama, Sho Nakagomi, Tatsuya Karakame
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Patent number: 7616085Abstract: A common mode choke coil includes two laminated coil conductors, a first magnetic substrate arranged on one of the coil conductors, and a second magnetic substrate arranged on the other coil conductor. When it is assumed that a distance from a conductor center of the one coil conductor to the surface of the first magnetic substrate is designated as A, a distance from a conductor center of the other coil conductor to the surface of the second magnetic substrate is designated as B, and a distance from the conductor center of the one coil conductor to the conductor center of the other coil conductor is designated as C, C<(A+B)/2 is satisfied. Accordingly, because a difference in the distances between the magnetic substrates and the coil conductors becomes relatively small, a leakage inductance due to the difference in the distance decreases, and the cut-off frequency with respect to a differential mode signal can be increased.Type: GrantFiled: May 28, 2008Date of Patent: November 10, 2009Assignee: TDK CorporationInventors: Tomokazu Ito, Takeshi Okumura
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Publication number: 20080303621Abstract: A common mode choke coil includes two laminated coil conductors, a first magnetic substrate arranged on one of the coil conductors, and a second magnetic substrate arranged on the other coil conductor. When it is assumed that a distance from a conductor center of the one coil conductor to the surface of the first magnetic substrate is designated as A, a distance from a conductor center of the other coil conductor to the surface of the second magnetic substrate is designated as B, and a distance from the conductor center of the one coil conductor to the conductor center of the other coil conductor is designated as C, C<(A+B)/2 is satisfied. Accordingly, because a difference in the distances between the magnetic substrates and the coil conductors becomes relatively small, a leakage inductance due to the difference in the distance decreases, and the cut-off frequency with respect to a differential mode signal can be increased.Type: ApplicationFiled: May 28, 2008Publication date: December 11, 2008Applicant: TDK CORPORATIONInventors: Tomokazu ITO, Takeshi OKUMURA
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Publication number: 20080290977Abstract: A common mode choke coil is provided with first and second coil conductors that are magnetically coupled to each other, a third coil conductor that is electrically connected in series to the first coil conductor and substantially not magnetically coupled to the first coil conductor, a fourth coil conductor that is electrically connected in series to the second coil conductor and substantially not magnetically coupled to the second coil conductor, a first contact conductor for connecting the third coil conductor with the inner end of the first coil conductor, and a second contact conductor for connecting the fourth coil conductor with the inner end of the second coil conductor. The third coil conductor and the fourth coil conductor are substantially not magnetically coupled, and are in a linear symmetrical relationship based on a prescribed center line.Type: ApplicationFiled: May 13, 2008Publication date: November 27, 2008Applicant: TDK CORPORATIONInventors: Tomokazu ITO, Takeshi OKUMURA, Toshio TOMONARI
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Publication number: 20080286062Abstract: In the present invention, driving torque outputted from a motor portion is transmitted to a worm from a motor shaft, further to a helical gear from the worm, and is taken out to the outside from an output shaft which rotates together with the helical gear with a fixed shaft fixed to a gear box as a center. This fixed shaft is constructed in a hollow and cylindrical shape having an opening in which one end portion thereof has been opened, and a ceiling surface in which the other end portion thereof has been closed, and one end portion of this fixed shaft is subjected to dislocation preventive work, and is fixed to a gear box made of resin by pressing-in or insert molding. The other end portion of the fixed shaft is formed with the dislocation preventive structure of the output shaft and the helical gear installed to the fixed shaft.Type: ApplicationFiled: July 24, 2008Publication date: November 20, 2008Inventors: Takeshi OKUMURA, Kazuyuki Yamamoto, Shinichi Taniguchi
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Patent number: 7412947Abstract: A dehydrogenated fuel tank 32 which is replenished with an organic hydride-contained hydrogenated fuel and a gasoline tank 48 which is replenished with normal gasoline are provided. In order to separate the hydrogenated fuel into a hydrogen rich gas and dehydrogenation product, a dehydrogenation reactor 22 and a separator 40 are provided. The hydrogen rich gas flows into a hydrogen pipe 44 and is supplied into the intake pipe 12. A dehydrogenation product pipe 42 is provided with a flow separator 46. The dehydrogenation product is guided into the gasoline tank 48 until the mixed ratio of the dehydrogenation product reaches the maximum allowable ratio in the gasoline tank 48. Only if the ratio reaches the maximum allowable ratio, the dehydrogenation product is collected into a dehydrogenation product tank 50.Type: GrantFiled: March 15, 2005Date of Patent: August 19, 2008Assignee: Toyota Jidosha Kabushiki KaishaInventors: Tomohiro Shinagawa, Takeshi Okumura
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Patent number: 7362205Abstract: A common-mode filter comprises a first conductor layer, a second conductor layer, and an insulating layer placed between the first and second conductor layers. The first conductor layer has a first spiral part formed such as to draw a convolution and a first lead electrode extending from one end of the first spiral part. The second conductor layer has a second spiral part formed such as to draw a convolution and a second lead electrode extending from one end of the second spiral part. The first conductor layer is formed with third and fourth lead electrodes. The second conductor layer is formed with a connecting conductor connecting the third lead electrode to the other end of the first spiral part. The fourth lead electrode is connected to the other end of the second spiral part through a contact hole formed in the insulating layer. The third lead electrode is connected to one end of the connecting conductor through a contact hole formed in the insulating layer.Type: GrantFiled: August 11, 2006Date of Patent: April 22, 2008Assignee: TDK CorporationInventors: Tomokazu Ito, Takeshi Okumura
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Publication number: 20070285202Abstract: A common-mode filter comprises a first conductor layer, a second conductor layer, and an insulating layer placed between the first and second conductor layers. The first conductor layer has a first spiral part formed such as to draw a convolution and a first lead electrode extending from one end of the first spiral part. The second conductor layer has a second spiral part formed such as to draw a convolution and a second lead electrode extending from one end of the second spiral part. The first conductor layer is formed with third and fourth lead electrodes. The second conductor layer is formed with a connecting conductor connecting the third lead electrode to the other end of the first spiral part. The fourth lead electrode is connected to the other end of the second spiral part through a contact hole formed in the insulating layer. The third lead electrode is connected to one end of the connecting conductor through a contact hole formed in the insulating layer.Type: ApplicationFiled: August 11, 2006Publication date: December 13, 2007Applicant: TDK CORPORATIONInventors: Tomokazu Ito, Takeshi Okumura
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Patent number: 7256673Abstract: A coil assembly for reducing variations in characteristic impedance includes a winding section having a first surface and a second surface on the opposite side of the winding section from the first surface, a plurality of first protrusions provided on the first surface, and a plurality of second protrusions provided on the second surface. These protrusions are identical in shape to each other and are arrayed linearly on their respective surfaces so that the first protrusions are offset from the second protrusions. Two conducting wires are wound between neighboring protrusions such that one wire contacts one of the neighboring protrusions, while the other wire contacts the other neighboring protrusion.Type: GrantFiled: January 9, 2006Date of Patent: August 14, 2007Assignee: TDK CorporationInventors: Takeshi Okumura, Hiroshi Suzuki, Toshihiro Kuroshima, Eizou Hara, Katsumi Saito, Yuichiro Igarashi
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Publication number: 20070151527Abstract: A dehydrogenated fuel tank 32 which is replenished with an organic hydride-contained hydrogenated fuel and a gasoline tank 48 which is replenished with normal gasoline are provided. In order to separate the hydrogenated fuel into a hydrogen rich gas and dehydrogenation product, a dehydrogenation reactor 22 and a separator 40 are provided. The hydrogen rich gas flows into a hydrogen pipe 44 and is supplied into the intake pipe 12. A dehydrogenation product pipe 42 is provided with a flow separator 46. The dehydrogenation product is guided into the gasoline tank 48 until the mixed ratio of the dehydrogenation product reaches the maximum allowable ratio in the gasoline tank 48. Only if the ratio reaches the maximum allowable ratio, the dehydrogenation product is collected into a dehydrogenation product tank 50.Type: ApplicationFiled: March 15, 2005Publication date: July 5, 2007Applicant: Toyota Jidosha Kabushiki KaishaInventors: Tomohiro Shinagawa, Takeshi Okumura
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Patent number: 7091816Abstract: A common-mode choke coil comprises an insulating layer and first and second coil conductors. The first and second coil conductors are laminated with the insulating layer interposed therebetween and are magnetically coupled to each other. A width W (mm) and a length L (mm) of at least one coil conductor in the first and second coil conductors satisfy the relational expression of: ?{square root over (L/W)}<(7.6651?fc)/0.1385 where fc (MHz) is the cutoff frequency with respect to differential-mode noise.Type: GrantFiled: March 7, 2006Date of Patent: August 15, 2006Assignee: TDK CorporationInventors: Tomokazu Ito, Takeshi Okumura
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Patent number: 7089907Abstract: An internal combustion engine system comprises: a dehydrogenation reactor which performs a dehydrogenation reaction to separate organic hydride-contained fuel into hydrogen and dehydrogenated fuel; supply means which supplies separated hydrogen and dehydrogenated fuel individually to the internal combustion engine; and control means which switches the operation of the internal combustion engine between a first mode in which both hydrogen and dehydrogenated fuel are supplied to the internal combustion engine and a second mode in which only hydrogen is supplied to the internal combustion engine.Type: GrantFiled: March 29, 2005Date of Patent: August 15, 2006Assignee: Toyota Jidosha Kabushiki KaishaInventors: Tomohiro Shinagawa, Takeshi Okumura
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Publication number: 20060170526Abstract: A coil assembly for reducing variations in characteristic impedance includes a winding section having a first surface and a second surface on the opposite side of the winding section from the first surface, a plurality of first protrusions provided on the first surface, and a plurality of second protrusions provided on the second surface. These protrusions are identical in shape to each other and are arrayed linearly on their respective surfaces so that the first protrusions are offset from the second protrusions. Two conducting wires are wound between neighboring protrusions such that one wire contacts one of the neighboring protrusions, while the other wire contacts the other neighboring protrusion.Type: ApplicationFiled: January 9, 2006Publication date: August 3, 2006Applicant: TDK CORPORATIONInventors: Takeshi Okumura, Hiroshi Suzuki, Toshihiro Kuroshima, Eizou Hara, Katsumi Saito, Yuichiro Igarashi
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Publication number: 20050224042Abstract: An internal combustion engine system comprises: a dehydrogenation reactor which performs a dehydrogenation reaction to separate organic hydride-contained fuel into hydrogen and dehydrogenated fuel; supply means which supplies separated hydrogen and dehydrogenated fuel individually to the internal combustion engine; and control means which switches the operation of the internal combustion engine between a first mode in which both hydrogen and dehydrogenated fuel are supplied to the internal combustion engine and a second mode in which only hydrogen is supplied to the internal combustion engine.Type: ApplicationFiled: March 29, 2005Publication date: October 13, 2005Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tomohiro Shinagawa, Takeshi Okumura
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Publication number: 20050115349Abstract: In the present invention, driving torque outputted from a motor portion is transmitted to a worm from a motor shaft, further to a helical gear from the worm, and is taken out to the outside from an output shaft which rotates together with the helical gear with a fixed shaft fixed to a gear box as a center. This fixed shaft is constructed in a hollow and cylindrical shape having an opening in which one end portion thereof has been opened, and a ceiling surface in which the other end portion thereof has been closed, and one end portion of this fixed shaft is subjected to dislocation preventive work, and is fixed to a gear box made of resin by pressing-in or insert molding. The other end portion of the fixed shaft is formed with the dislocation preventive structure of the output shaft and the helical gear installed to the fixed shaft.Type: ApplicationFiled: November 8, 2004Publication date: June 2, 2005Inventors: Takeshi Okumura, Kazuyuki Yamamoto, Shinichi Taniguchi
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Patent number: 6725827Abstract: A fuel injector (6) and spark plug (7) are arranged in a combustion chamber (5) of an internal combustion engine. By forming by stratification a self-ignitable preliminary air-fuel mixture in the combustion chamber (5), a spatial distribution is given to the density of the preliminary air-fuel mixture in the combustion chamber (5). Part of the preliminary air-fuel mixture formed in the combustion chamber (5) is ignited by the spark plug (7) to cause combustion by flame propagation, then the remaining preliminary air-fuel mixture is successively made to self-ignite and burn with a time lag. The ignition timing is set so that the ratio of the preliminary air-fuel mixture made to burn by self-ignition becomes more than a predetermined lower limit and less than a knocking generation limit.Type: GrantFiled: October 3, 2002Date of Patent: April 27, 2004Assignees: Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Takanori Ueda, Takeshi Okumura, Shigeo Furuno, Satoshi Iguchi, Kazuhiro Akihama, Masahiro Taki, Satoshi Yamazaki
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Patent number: 6711893Abstract: A gasoline in a material fuel tank is separated into a high-RON fuel having a higher octane value than the material fuel and a low-RON fuel having a lower octane value than the material fuel, by a separator device equipped with a separation membrane. Using a fuel switching mechanism, one or both of the high-RON fuel and the low-RON fuel are supplied to the engine in accordance with the state of operation of the engine. As the octane value of a fuel can be changed in accordance with the engine operation state, the state of combustion in the engine improves, so that both an increase in engine output and an improvement in an exhaust property can be achieved.Type: GrantFiled: September 7, 2001Date of Patent: March 30, 2004Assignees: Toyota Jidosha Kabushiki Kaisha, ExxonMobil Research and Engineering Co.Inventors: Takanori Ueda, Takeshi Okumura, Yoshihiro Iwashita, Kazuhiro Akihama, Masahiro Taki, Satoshi Yamazaki, Walter Weissman, Bhupender S. Minhas
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Patent number: 6655347Abstract: An intake port of an internal combustion engine having an intake passage curved to a certain direction and communicated with a combustion chamber of the engine to send air into the combustion chamber, provided with a groove provided in a wall at a side near a center of curvature of said intake passage in the wall defining the intake passage and extending along the flow of air in the intake passage, at least one long edge formed by one side wall of the wall defining said groove and the wall adjoining said side wall in the wall defining the intake passage, extending along the flow of air in the intake passage, and projecting out toward the inside of the intake passage, and a bent part provided at the wall of the side near the center of curvature of the intake passage in the wall defining the intake passage in proximity to a line connecting the intake passage and combustion chamber and extending in a horizontal direction with respect to the flow of air in the intake passage.Type: GrantFiled: March 7, 2003Date of Patent: December 2, 2003Assignee: Toyota Jidosha Kabushiki KaishaInventors: Fumio Takamiya, Takeshi Okumura, Shikio Katayama
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Publication number: 20030168040Abstract: An intake port of an internal combustion engine having an intake passage curved to a certain direction and communicated with a combustion chamber of the engine to send air into the combustion chamber, provided with a groove provided in a wall at a side near a center of curvature of said intake passage in the wall defining the intake passage and extending along the flow of air in the intake passage, at least one long edge formed by one side wall of the wall defining said groove and the wall adjoining said side wall in the wall defining the intake passage, extending along the flow of air in the intake passage, and projecting out toward the inside of the intake passage, and a bent part provided at the wall of the side near the center of curvature of the intake passage in the wall defining the intake passage in proximity to a line connecting the intake passage and combustion chamber and extending in a horizontal direction with respect to the flow of air in the intake passage.Type: ApplicationFiled: March 7, 2003Publication date: September 11, 2003Applicant: Toyota Jidosha Kabushiki KaishaInventors: Fumio Takamiya, Takeshi Okumura, Shikio Katayama