Patents by Inventor Katsushi Sakaue
Katsushi Sakaue 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: 8125124Abstract: 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 3, 2010Date of Patent: February 28, 2012Assignee: Kyocera CorporationInventors: Mitsuo Kondo, Masaki Terazono, Takeshi Okamura, Katsushi Sakaue
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Patent number: 7902726Abstract: 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: August 13, 2008Date of Patent: March 8, 2011Assignee: Kyocera CorporationInventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo
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Patent number: 7759847Abstract: 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: August 13, 2008Date of Patent: July 20, 2010Assignee: Kyocera CorporationInventors: Takeshi Okamura, Katsushi Sakaue, Mitsuo Kondo
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Publication number: 20100156250Abstract: 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 3, 2010Publication date: June 24, 2010Applicant: KYOCERA CORPORATIONInventors: Mitsuo Kondo, Masaki Terazono, Takeshi Okamura, Katsushi Sakaue
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Patent number: 7705525Abstract: 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: May 18, 2009Date of Patent: April 27, 2010Assignee: Kyocera CorporationInventors: Mitsuo Kondo, Masaki Terazono, Takeshi Okamura, Katsushi Sakaue
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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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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: 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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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: 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: 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
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Publication number: 20070080612Abstract: A multi-layer piezoelectric element of high reliability and high durability, that undergoes smaller variations in the amount of displacement even when used under a high electric field and high pressure and is subject to less variations in the amount of displacement even when used in continuous operation over a long period of time 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 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 on the first side face and the other internal electrode is connected to the external electrode formed on the second side face, while the ratio of change in the amount of displacement of the element after undergoing continuous operation of 1×109 cycles or more to the initial device dimension is not larger than 5%.Type: ApplicationFiled: October 26, 2004Publication date: April 12, 2007Inventors: Masaki Terazono, Takeshi Okamura, Katsushi Sakaue