Patents by Inventor Takeshi Okamura
Takeshi Okamura 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: 20100066211Abstract: In order to provide a multi-layer electronic component in which the occurrence of delamination between the ceramic layer and the internal electrode is restricted and a method for manufacturing the same, the multi-layer electronic component of the present invention comprises a stack formed by stacking piezoelectric layers and internal electrodes one on another alternately and a pair of external electrodes formed on two opposing side faces of the stack, wherein the internal electrode consists of a first internal electrode connected to the external electrode formed on one of the two side faces and a second internal electrode located between the first internal electrode and connected to the external electrode formed on the other one of the two side faces, and wherein the internal electrodes and the piezoelectric layers are faced in proximity so that a space between them is 2 ?m or less over an area occupying 50% or more of the active region where the first internal electrode and the second internal electrode oppoType: ApplicationFiled: October 28, 2009Publication date: March 18, 2010Applicant: KYOCERA CORPORATIONInventors: Susumu ONO, Takeshi OKAMURA, Katsushi SAKAUE, Takaaki HIRA, Masaki TERAZONO
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Patent number: 7679272Abstract: To provide a multi-layer piezoelectric device having excellent durability in which the amount of displacement does not change even when the piezoelectric actuator is subjected to continuous operation over a long period of time under a high voltage and a high pressure, the multi-layer piezoelectric device comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while content of alkali metal in a range from 5 ppm to 300 ppm is contained.Type: GrantFiled: September 22, 2004Date of Patent: March 16, 2010Assignee: Kyocera CorporationInventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo
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Publication number: 20100031986Abstract: A thermoelectric module includes a first substrate, a second substrate having a second surface which is apart from and faces a first surface of the first substrate, a plurality of thermoelectric elements arranged on the first and the second surfaces, a plurality of electrodes on the first and second surfaces each electrically connected to at least one of the plurality of thermoelectric elements, and a ground electrode on at least the first surface. The plurality of electrodes on at least the first surface comprises a plurality of columns each of which comprises two or more electrodes aligned in a longitudinal direction, and the ground electrode is between two adjacent columns among the plurality of columns.Type: ApplicationFiled: January 27, 2009Publication date: February 11, 2010Applicant: KYOCERA CORPORATIONInventor: Takeshi Okamura
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Patent number: 7656077Abstract: A laminated piezoelectric device obtained by alternately laminating the piezoelectric layers containing Pb and the conducting layers containing palladium as a conducting component, wherein the piezoelectric layer formed between the two conducting layers has layer regions where Pb and Pd are mixed together in the interfacial portions thereof relative to the conducting layers, the layer regions having a thickness of not larger than 3% of the thickness of the piezoelectric layer. The laminated piezoelectric device is formed by co-firing the Pb-containing piezoelectric layers and the palladium (Pd)-containing layers, the piezoelectric layers therein having a large insulation resistance and good piezoelectric characteristics.Type: GrantFiled: December 17, 2004Date of Patent: February 2, 2010Assignee: Kyocera CorporationInventors: Takaaki Hira, Takeshi Okamura, Masaki Terazono, Hirotaka Tsuyoshi, Ryuusuke Tsuyoshi, legal representative, Katsushi Sakaue
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Patent number: 7633210Abstract: In order to provide a multi-layer electronic component in which the occurrence of delamination between the ceramic layer and the internal electrode is restricted and a method for manufacturing the same, the multi-layer electronic component of the present invention comprises a stack formed by stacking piezoelectric layers and internal electrodes one on another alternately and a pair of external electrodes formed on two opposing side faces of the stack, wherein the internal electrode consists of a first internal electrode connected to the external electrode formed on one of the two side faces and a second internal electrode located between the first internal electrode and connected to the external electrode formed on the other one of the two side faces, and wherein the internal electrodes and the piezoelectric layers are faced in proximity so that a space between them is 2 ?m or less over an area occupying 50% or more of the active region where the first internal electrode and the second internal electrode oppoType: GrantFiled: July 28, 2004Date of Patent: December 15, 2009Assignee: Kyocera CorporationInventors: Susumu Ono, Takeshi Okamura, Katsushi Sakaue, Takaaki Hira, Masaki Terazono
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Patent number: 7633214Abstract: A multi-layer piezoelectric element having excellent durability in which the amount of displacement does not change even after subjecting to continuous operation over a long period of time under a high voltage and a high pressure is provided. The multi-layer piezoelectric element comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes the proportion of silver contained in electrically conductive material of the internal electrode near the junction with the external electrode is higher than the proportion of silver contained in electrically conductive material of the internal electrode located inside of the stack.Type: GrantFiled: September 22, 2004Date of Patent: December 15, 2009Assignee: Kyocera CorporationInventors: Takeshi Okamura, Katsushi Sakaue, Shigenobu Nakaumra
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Publication number: 20090295256Abstract: In a multilayer piezoelectric element in which a plurality of piezoelectric layers and a plurality of metal layers are stacked alternately, the plurality of metal layers include a plurality of low-filled metal layers having a lower filling rate of metal composing the metal layers than oppositely disposed metal layers adjacent to each other in a stacking direction. In a multilayer piezoelectric element in which a plurality of piezoelectric layers and a plurality of metal layers are stacked alternately, the plurality of metal layers include a plurality of thin metal layers having a smaller thickness than oppositely disposed metal layers adjacent to each other in a stacking direction.Type: ApplicationFiled: June 15, 2006Publication date: December 3, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Masaki Terazono, Tomohiro Kawamoto, Takafumi Tsurumaru, Shigenobu Nakamura, Ken Yamamoto
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Publication number: 20090289130Abstract: A laminated piezoelectric element having a laminated structure in which a plurality of piezoelectric layers and a plurality of internal electrodes are alternately laminated is provided. This laminated structure has an opposing section wherein an internal electrode on an anode side and an internal electrode on a cathode side which are adjacent to each other in the laminating direction, oppose in the laminating direction, and an end-side non-opposing section situated in a position closer to end in the laminating direction than the opposing section. This end-side non-opposing section has a porous section having porosity larger than that of the internal electrodes.Type: ApplicationFiled: June 12, 2009Publication date: November 26, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Ichitaro Okamura
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Publication number: 20090224636Abstract: A multi-layer piezoelectric element having high durability which allows it to increase the amount of displacement of a piezoelectric actuator under high voltage and high pressure and does not undergo a change in the amount of displacement during continuous operation in a high electric field and under a high pressure over a long time period is provided. The multi-layer piezoelectric element comprises a stack of at least one piezoelectric layer and a plurality of internal electrodes consisting of first and second internal electrodes placed one on another, a first external electrode formed on a first side face of the stack and connected to the first internal electrode and a second external electrode formed on a second side face of the stack and connected to the second internal electrode, wherein the bonding strength between the piezoelectric layer and the internal electrode is weaker than the bending strength of the piezoelectric layer.Type: ApplicationFiled: May 18, 2009Publication date: September 10, 2009Applicant: KYOCERA CORPORATIONInventors: Mitsuo KONDO, Masaki TERAZONO, Takeshi OKAMURA, Katsushi SAKAUE
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Publication number: 20090220765Abstract: A ceramic member in which the metal layers with high void ratio are sufficiently sintered to lower a residue of resin is produced. The method for manufacturing a ceramic member which comprises a step of forming a stacked compact from a plurality of metallic paste layers containing a metal component M1 that are stacked one on another via ceramic green sheets, and a step of firing the stacked compact, wherein at least one of plural metallic paste layers is formed as a second metallic paste layer that has the mass percentage X higher than that of the metallic paste layer that adjoin therewith in the stacking direction and a ceramic powder is contained in the second metallic paste layer in the step of forming the stacked compact, the mass percentage X being the proportion of the metal component M1 to the total metal content in the metallic paste layer.Type: ApplicationFiled: February 27, 2007Publication date: September 3, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Shigenobu Nakamura, Tomohiro Kawamoto, Nobuyuki Ito, Takafumi Tsurumaru, Tsuyoshi Setoguchi
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Patent number: 7554251Abstract: A multi-layer piezoelectric element having high durability which allows it to increase the amount of displacement of a piezoelectric actuator under high voltage and high pressure and does not undergo a change in the amount of displacement during continuous operation in a high electric field and under a high pressure over a long time period is provided. The multi-layer piezoelectric element comprises a stack of at least one piezoelectric layer and a plurality of internal electrodes consisting of first and second internal electrodes placed one on another, a first external electrode formed on a first side face of the stack and connected to the first internal electrode and a second external electrode formed on a second side face of the stack and connected to the second internal electrode, wherein the bonding strength between the piezoelectric layer and the internal electrode is weaker than the bending strength of the piezoelectric layer.Type: GrantFiled: March 9, 2005Date of Patent: June 30, 2009Assignee: Kyocera CorporationInventors: Mitsuo Kondo, Masaki Terazono, Takeshi Okamura, Katsushi Sakaue
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Publication number: 20090162706Abstract: A ceramic member in which the metal layers with high void ratio are sufficiently sintered to lower a residue of resin is produced. The method for manufacturing a ceramic member which comprises a step of forming a stacked compact from a plurality of metallic paste layers containing a metal component M1 that are stacked one on another via ceramic green sheets, and a step of firing the stacked compact, wherein at least one of plural metallic paste layers is formed as a second metallic paste layer that has the mass percentage X higher than that of the metallic paste layer that adjoin therewith in the stacking direction, the mass percentage X being the proportion of the metal component M1 to the total metal content in the metallic paste layer.Type: ApplicationFiled: February 28, 2007Publication date: June 25, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Tomohiro Kawamoto, Shigenobu Nakamura
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Publication number: 20090045702Abstract: To provide a multi-layer piezoelectric device having excellent durability in which the amount of displacement does not change even when the piezoelectric actuator is subjected to continuous operation over a long period of time under a high voltage and a high pressure, the multi-layer piezoelectric device comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while content of alkali metal in a range from 5 ppm to 300 ppm is contained.Type: ApplicationFiled: August 13, 2008Publication date: February 19, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi OKAMURA, Katsushi SAKAUE, Mitsuo KONDO
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Publication number: 20090045701Abstract: To provide a multi-layer piezoelectric device having excellent durability in which the amount of displacement does not change even when the piezoelectric actuator is subjected to continuous operation over a long period of time under a high voltage and a high pressure, the multi-layer piezoelectric device comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while content of alkali metal in a range from 5 ppm to 300 ppm is contained.Type: ApplicationFiled: August 13, 2008Publication date: February 19, 2009Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo
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Publication number: 20080303385Abstract: To provide a multi-layer piezoelectric device having excellent durability in which the amount of displacement does not change even when the piezoelectric actuator is subjected to continuous operation over a long period of time under a high voltage and a high pressure, the multi-layer piezoelectric device comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while content of alkali metal in a range from 5 ppm to 300 ppm is contained.Type: ApplicationFiled: August 13, 2008Publication date: December 11, 2008Applicant: KYOCERA CORPORATIONInventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo
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Publication number: 20080238264Abstract: The multi-layer piezoelectric element comprises a stack having an active portion constituted from at least one piezoelectric layer and a plurality of internal electrodes consisting of first and second internal electrodes placed one on another, the active portion being subjected to expansion and contraction in response to a voltage applied across the first internal electrode and the second internal electrode, and external electrodes formed on two side faces of the stack with one thereof being connected to the first internal electrode and the other connected to the second internal electrode, wherein each of the external electrodes is constituted from three or more layers including a first layer formed in contact with the side face of the stack and a second layer formed on the first layer, to provide a multi-layer piezoelectric element having high durability.Type: ApplicationFiled: March 29, 2005Publication date: October 2, 2008Applicant: Kyocera CorporationInventors: Shigenobu Nakamura, Takafumi Tsurumaru, Takeshi Okamura
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Publication number: 20070278907Abstract: A multi-layer piezoelectric element having high durability which allows it to increase the amount of displacement of a piezoelectric actuator under high voltage and high pressure and does not undergo a change in the amount of displacement during continuous operation in a high electric field and under a high pressure over a long time period is provided. The multi-layer piezoelectric element comprises a stack of at least one piezoelectric layer and a plurality of internal electrodes consisting of first and second internal electrodes placed one on another, a first external electrode formed on a first side face of the stack and connected to the first internal electrode and a second external electrode formed on a second side face of the stack and connected to the second internal electrode, wherein the bonding strength between the piezoelectric layer and the internal electrode is weaker than the bending strength of the piezoelectric layer.Type: ApplicationFiled: March 9, 2005Publication date: December 6, 2007Applicant: KYOCERA CORPORATIONInventors: Mitsuo Kondo, Masaki Terazono, Takeshi Okamura, Katsushi Sakaue
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Publication number: 20070273251Abstract: A multi-layer piezoelectric element having excellent durability in which the amount of displacement does not change even after subjecting to continuous operation over a long period of time under a high voltage and a high pressure is provided.Type: ApplicationFiled: September 22, 2004Publication date: November 29, 2007Inventors: Takeshi Okamura, Katsushi Sakaue, Shigenobu Nakaumra
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Publication number: 20070209173Abstract: A laminated piezoelectric device obtained by alternately laminating the piezoelectric layers containing Pb and the conducting layers containing palladium as a conducting component, wherein the piezoelectric layer formed between the two conducting layers has layer regions where Pb and Pd are mixed together in the interfacial portions thereof relative to the conducting layers, the layer regions having a thickness of not larger than 3% of the thickness of the piezoelectric layer. The laminated piezoelectric device is formed by co-firing the Pb-containing piezoelectric layers and the palladium (Pd)-containing layers, the piezoelectric layers therein having a large insulation resistance and good piezoelectric characteristics.Type: ApplicationFiled: December 17, 2004Publication date: September 13, 2007Applicant: KYOCERA CORPORATIONInventors: Takaaki Hira, Takeshi Okamura, Masaki Terazono, Hirotaka Tsuyoshi, Ryuusuke Tsuyoshi, Katsushi Sakaue
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Publication number: 20070205700Abstract: To provide a multi-layer piezoelectric device having excellent durability in which the amount of displacement does not change even when the piezoelectric actuator is subjected to continuous operation over a long period of time under a high voltage and a high pressure, the multi-layer piezoelectric device comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while content of alkali metal in a range from 5 ppm to 300 ppm is contained.Type: ApplicationFiled: September 22, 2004Publication date: September 6, 2007Inventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo