Patents by Inventor Shigetaka Kaga
Shigetaka Kaga 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: 20240151090Abstract: A diagnosing device identifies a plugging operation period in which a plug door performs a plugging operation, the plug door having a guide roller attached thereto, the plug door being configured to perform an opening-closing operation and the plugging operation by allowing the guide roller to move along a guide rail; obtains drive information including a value representing at least one of a current value or a torque value of a drive unit, the drive unit being configured to drive the plug door; and diagnoses an abnormality in the guide roller or the guide rail based on the drive information observed during the identified plugging operation period.Type: ApplicationFiled: November 1, 2023Publication date: May 9, 2024Inventors: Joji IMAI, Shigetaka KAGA
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Patent number: 10873315Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The excitation electrode includes a main thickness portion and an inclined portion, the main thickness portion has a constant thickness, the inclined portion is formed on a peripheral area of the main thickness portion, the inclined portion gradually decrease in thickness from a part contacting the main thickness portion toward an outermost periphery of the excitation electrode. The inclined portion has a width as an inclination width in a length of 0.84 times or more and 1.37 times or less of a first flexural wavelength and 2.29 times or more and 3.71 times or less of a second flexural wavelength, the first flexural wavelength is a wavelength of a flexure vibration at a fundamental wave of the thickness-shear vibration, the second flexural wavelength is a wavelength of a flexure vibration at a third harmonic of the thickness-shear vibration.Type: GrantFiled: January 11, 2018Date of Patent: December 22, 2020Assignee: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka Kaga, Kazuhiro Hirota
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Patent number: 10804876Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate, a first excitation electrode, and a second excitation electrode. The piezoelectric substrate is formed into a flat plate shape and vibrates in a thickness-shear vibration mode. The first excitation electrode is formed on one principal surface of the piezoelectric substrate. The second excitation electrode is formed on another principal surface of the piezoelectric substrate. The first excitation electrode is formed to entirely have an identical thickness. The second excitation electrode has a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion and gradually decreases in thickness from a portion in contact with the main thickness portion to an outermost periphery of the second excitation electrode. The main thickness portion has a thickness larger than the thickness of the first excitation electrode.Type: GrantFiled: December 4, 2017Date of Patent: October 13, 2020Assignee: NIHON DEMPA KOGYO CO., LTD.Inventor: Shigetaka Kaga
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Patent number: 10763821Abstract: A crystal resonator vibrates in a thickness-shear mode. The crystal resonator includes excitation electrodes being disposed on a front surface and a back surface of a crystal element. The excitation electrodes are disposed on the crystal element to have a positional relationship, where a displacement distribution at an edge of the excitation electrode on the front surface is identical to a displacement distribution at an edge of the excitation electrode on the back surface.Type: GrantFiled: August 21, 2017Date of Patent: September 1, 2020Assignee: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka Kaga, Yoshiro Teshima, Kazuhiro Hirota
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Publication number: 20190149124Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are formed on respective both principal surfaces of the piezoelectric substrate and each include a main thickness portion and a flat portion. The main thickness portion has a first thickness. The flat portion is formed in a peripheral area of the main thickness portion and has a second thickness that is thinner than the first thickness between from a portion contacting the main thickness portion to an outermost periphery of the excitation electrode, extends from the portion contacting the main thickness portion to the outermost periphery of the excitation electrode, and has a width formed to have a length of 0.63 times or more and 1.88 times or less of a flexural wavelength of an unnecessary vibration.Type: ApplicationFiled: November 13, 2018Publication date: May 16, 2019Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka KAGA, Masaaki NAKAHARA
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Patent number: 10277197Abstract: A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z??-axis direction determined by an X??-axis and obliquely disposed with respect to the Y?-axis direction. The X??-axis is rotated by 260° to 300° counterclockwise about a Y?-axis using a +X?-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X??-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.Type: GrantFiled: December 22, 2016Date of Patent: April 30, 2019Assignee: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka Kaga, Kazuhiro Hirota, Yoshiro Teshima, Masaaki Nakahara
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Patent number: 10250224Abstract: A piezoelectric vibrating piece includes a vibrating piece body and at least a pair of excitation electrodes. The vibrating piece body includes a vibrator. The pair of excitation electrodes are formed on respective front surface and back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece cut out parallel to an X?-Z? surface. The X?-Z? surface is rotated around a Z-axis of a crystallographic axis of a crystal and further rotated around an X?-axis. The pair of excitation electrodes are collocated in a Z??-axis direction determined by an X??-axis. The X??-axis is defined by counterclockwise rotation from a +X?-axis direction around a Y?-axis by 260° to 300°. The pair of excitation electrodes are disposed inclined with respect to the Y?-axis direction.Type: GrantFiled: June 12, 2015Date of Patent: April 2, 2019Assignee: NIHON DEMPA KOGYO CO., LTD.Inventor: Shigetaka Kaga
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Publication number: 20180205364Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The excitation electrode includes a main thickness portion and an inclined portion, the main thickness portion has a constant thickness, the inclined portion is formed on a peripheral area of the main thickness portion, the inclined portion gradually decrease in thickness from a part contacting the main thickness portion toward an outermost periphery of the excitation electrode. The inclined portion has a width as an inclination width in a length of 0.84 times or more and 1.37 times or less of a first flexural wavelength and 2.29 times or more and 3.71 times or less of a second flexural wavelength, the first flexural wavelength is a wavelength of a flexure vibration at a fundamental wave of the thickness-shear vibration, the second flexural wavelength is a wavelength of a flexure vibration at a third harmonic of the thickness-shear vibration.Type: ApplicationFiled: January 11, 2018Publication date: July 19, 2018Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka KAGA, Kazuhiro HIROTA
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Publication number: 20180167051Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate, a first excitation electrode, and a second excitation electrode. The piezoelectric substrate is formed into a flat plate shape and vibrates in a thickness-shear vibration mode. The first excitation electrode is formed on one principal surface of the piezoelectric substrate. The second excitation electrode is formed on another principal surface of the piezoelectric substrate. The first excitation electrode is formed to entirely have an identical thickness. The second excitation electrode has a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion and gradually decreases in thickness from a portion in contact with the main thickness portion to an outermost periphery of the second excitation electrode. The main thickness portion has a thickness larger than the thickness of the first excitation electrode.Type: ApplicationFiled: December 4, 2017Publication date: June 14, 2018Applicant: NIHON DEMPA KOGYO CO., LTD.Inventor: Shigetaka KAGA
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Publication number: 20180115301Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are disposed on respective both principal surfaces of the piezoelectric substrate. The excitation electrode includes a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion. The inclined portion has a thickness that gradually decreases from a portion contacting the main thickness portion to an outermost periphery of the excitation electrode. An inclination width as a width of the inclined portion has a length that is equal to or more than 0.5 times and equal to or less than three times of a flexural wavelength. The flexural wavelength is a wavelength of a flexure vibration as an unnecessary vibration.Type: ApplicationFiled: October 16, 2017Publication date: April 26, 2018Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
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Publication number: 20180054181Abstract: A crystal resonator vibrates in a thickness-shear mode. The crystal resonator includes excitation electrodes being disposed on a front surface and a back surface of a crystal element. The excitation electrodes are disposed on the crystal element to have a positional relationship, where a displacement distribution at an edge of the excitation electrode on the front surface is identical to a displacement distribution at an edge of the excitation electrode on the back surface.Type: ApplicationFiled: August 21, 2017Publication date: February 22, 2018Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
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Publication number: 20170187348Abstract: A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z??-axis direction determined by an X??-axis and obliquely disposed with respect to the Y?-axis direction. The X??-axis is rotated by 260° to 300° counterclockwise about a Y?-axis using a +X?-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X??-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.Type: ApplicationFiled: December 22, 2016Publication date: June 29, 2017Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Shigetaka KAGA, Kazuhiro HIROTA, Yoshiro TESHIMA, Masaaki NAKAHARA
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Publication number: 20170126199Abstract: A piezoelectric vibrating piece includes a vibrating piece body and at least a pair of excitation electrodes. The vibrating piece body includes a vibrator. The pair of excitation electrodes are formed on respective front surface and back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece cut out parallel to an X?-Z? surface. The X?-Z? surface is rotated around a Z-axis of a crystallographic axis of a crystal and further rotated around an X?-axis. The pair of excitation electrodes are collocated in a Z??-axis direction determined by an X??-axis. The X??-axis is defined by counterclockwise rotation from a +X?-axis direction around a Y?-axis by 260° to 300°. The pair of excitation electrodes are disposed inclined with respect to the Y?-axis direction.Type: ApplicationFiled: June 12, 2015Publication date: May 4, 2017Applicant: NIHON DEMPA KOGYO CO., LTD.Inventor: Shigetaka KAGA
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Patent number: 8508102Abstract: A piezoelectric plate in the piezoelectric sensor is obtained from a rotated Y-plate where a rotation angle around the X-axis is set according to a type of the piezoelectric crystalline material, a detection region is located on a surface parallel to an X-Z plane, and a transmitting and a receiving parts are opposite to each other at positions sandwiching the detection region along an X-axis direction of the piezoelectric plate. When a guided wave excited by applying a frequency signal from the transmitting part satisfies ?h=m?/(2?) (2h: thickness of the piezoelectric plate, ?: wave number in the X-axis, ?: wave number in thickness direction normalized by ?, m: positive even number), the rotation angle satisfies the displacement of a P wave component of the guided wave becomes the maximum, or the displacement of the SH wave component of the guided wave becomes the maximum.Type: GrantFiled: May 28, 2012Date of Patent: August 13, 2013Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Shigetaka Kaga, Morio Onoe
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Publication number: 20120306315Abstract: A piezoelectric plate in the piezoelectric sensor is obtained from a rotated Y-plate where a rotation angle around the X-axis is set according to a type of the piezoelectric crystalline material, a detection region is located on a surface parallel to an X-Z plane, and a transmitting and a receiving parts are opposite to each other at positions sandwiching the detection region along an X-axis direction of the piezoelectric plate. When a guided wave excited by applying a frequency signal from the transmitting part satisfies ?h=m?/(2?) (2h: thickness of the piezoelectric plate, ?: wave number in the X-axis, ?: wave number in thickness direction normalized by ?, m: positive even number), the rotation angle satisfies the displacement of a P wave component of the guided wave becomes the maximum, or the displacement of the SH wave component of the guided wave becomes the maximum.Type: ApplicationFiled: May 28, 2012Publication date: December 6, 2012Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: SHIGETAKA KAGA, MORIO ONOE
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Patent number: 8242856Abstract: There is provided a temperature compensated piezoelectric oscillator which excels in frequency stability and has a good electronic noise characteristic, and with which a circuit can be structured simply. An auxiliary oscillator unit 21 sharing a crystal substrate 2 with a main oscillator unit 11 outputting a set frequency f0 to an outside is used as a temperature detecting unit 32 detecting a temperature T for obtaining a compensation voltage ?V in a temperature compensated piezoelectric oscillator (TCXO), and electrodes 13, 23 of the main oscillator unit 11 and the auxiliary oscillator unit 21 are provided separately on the crystal substrate 2. For example, a fundamental wave and an overtone are used or a thickness shear vibration and a contour shear vibration are used in the main oscillator unit 11 and the auxiliary oscillator unit 21, respectively.Type: GrantFiled: November 29, 2010Date of Patent: August 14, 2012Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Mitsuaki Koyama, Shigetaka Kaga, Kazuo Akaike, Shigenori Watanabe
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Publication number: 20110221538Abstract: To provide a technique capable of suppressing electric energy by a fundamental wave vibration and reducing phase noise in a piezoelectric oscillator using an overtone of a thickness shear vibration in a piezoelectric piece. An excitation electrode portion in an electrode 2 on one surface side of an AT cut crystal piece 1 is separated from each other in a direction perpendicular to a thickness shear vibration direction (in a Z?-axis direction) and separated portions are formed in parallel in a strip shape as divided electrodes 21, 22. The divided electrodes 21, 22 have end portions thereof connected to each other to be formed in an angular C-shape as a whole. An electrode 3 on the other surface side has strip-shaped excitation electrode portions 31, 32 formed at positions facing the first divided electrode 21 and the second divided electrode 22 on the one surface side respectively to be formed in an angular C-shaped electrode in the opposite direction.Type: ApplicationFiled: February 10, 2011Publication date: September 15, 2011Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Mitsuaki Koyama, Shigetaka Kaga, Shigenori Watanabe
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Publication number: 20110156823Abstract: There is provided a temperature compensated piezoelectric oscillator which excels in frequency stability and has a good electronic noise characteristic, and with which a circuit can be structured simply. An auxiliary oscillator unit 21 sharing a crystal substrate 2 with a main oscillator unit 11 outputting a set frequency f0 to an outside is used as a temperature detecting unit 32 detecting a temperature T for obtaining a compensation voltage ?V in a temperature compensated piezoelectric oscillator (TCXO), and electrodes 13, 23 of the main oscillator unit 11 and the auxiliary oscillator unit 21 are provided separately on the crystal substrate 2. For example, a fundamental wave and an overtone are used or a thickness shear vibration and a contour shear vibration are used in the main oscillator unit 11 and the auxiliary oscillator unit 21, respectively.Type: ApplicationFiled: November 29, 2010Publication date: June 30, 2011Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Mitsuaki Koyama, Shigetaka Kaga, Kazuo Akaike, Shigenori Watanabe