Patents by Inventor Jun Tabota
Jun Tabota 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: 6672160Abstract: An acceleration sensor includes a bimorph type acceleration detection element including a first resonator and a second resonator, each resonator formed of a piezoelectric body and having electrodes arranged on both main surfaces thereof, and an intermediate layer. The acceleration detection element is produced by bonding the first resonator and the second resonator with the intermediate layer interposed therebetween. The acceleration detection element is supported at one longitudinal end or opposed longitudinal ends thereof so that the first and second resonators are integrally deflected under acceleration. The intermediate layer is hard enough to transfer flexural stress in one of the first and second resonator to the other of the first and second resonators and the vibration of the one of the first and second resonators is attenuated when the vibration is transmitted from the one to the other of the first and second resonators.Type: GrantFiled: September 20, 2001Date of Patent: January 6, 2004Assignee: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Publication number: 20030217598Abstract: An acceleration sensor includes a sensing element and a pair of supporting members for supporting the sensing element at one end in the longitudinal direction thereof. The sensing element includes four laminated piezoelectric layers, and electrodes are provided at the center in the thickness direction of the sensing element, between a pair of first layers and a pair of second layers, and on the outer surfaces of the pair of second layers. Cells formed by the first and second layers at each side of the center in the thickness direction are electrically connected in parallel. The pair of first layers preferably have substantially the same thickness and the pair of second layers preferably have substantially the same thickness, and the ratio of the thickness T1 of each first layer to the total thickness T2 of each first and second layer is about 62% to about 76%.Type: ApplicationFiled: May 21, 2003Publication date: November 27, 2003Inventor: Jun Tabota
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Publication number: 20030172733Abstract: An acceleration sensor includes a piezoelectric element and a support member for supporting the piezoelectric element at both longitudinal ends thereof. The piezoelectric element includes a laminate of at least two piezoelectric layers. Each of the at least two piezoelectric layers includes three longitudinally aligned regions separated at two borders where stress is inverted in the longitudinal direction of the piezoelectric element when acceleration is applied. Cells, each formed of a respective region, are polarized in the same direction of thickness in each of the two external piezoelectric layers. Electrodes are arranged so that the three cells in the one piezoelectric layer are serially connected, the three cells in the other piezoelectric layer are serially connected, and then the three serially connected cells in the one piezoelectric layer and the three serially connected cells in the other piezoelectric layer are connected in parallel.Type: ApplicationFiled: March 5, 2003Publication date: September 18, 2003Inventor: Jun Tabota
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Publication number: 20030167844Abstract: An acceleration sensor includes a piezoelectric element and a support member for supporting the piezoelectric element at both longitudinal ends thereof. The piezoelectric element includes a laminate having a plurality of piezoelectric layers. An intermediate piezoelectric layer is a dummy layer which generates no charge when acceleration is applied thereto. Each of the two outer piezoelectric layers includes four longitudinally aligned regions separated at two borders and one central border where stress is inverted when the acceleration is applied. The two outer piezoelectric layers are polarized in the direction of thickness of the piezoelectric element such that cells adjacent to each other in the longitudinal direction of the piezoelectric elements have opposite polarization directions and such that cells aligned with each other in the direction of thickness have the same polarization.Type: ApplicationFiled: February 28, 2003Publication date: September 11, 2003Inventor: Jun Tabota
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Patent number: 6490926Abstract: An acceleration sensor module capable of performing sensitivity adjustment in a minimum arrangement without containing an amplifier includes an acceleration sensor and a trimmable resistor which are mounted on a printed wiring board. At least one terminal of the acceleration sensor and at least one terminal of the trimmable resistor are connected to at least one external connection terminal of the printed circuit board through printed wiring.Type: GrantFiled: November 16, 1999Date of Patent: December 10, 2002Assignee: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Publication number: 20020125792Abstract: An acceleration sensor including a bimorph type acceleration detection element including a pair of surface acoustic wave resonators laminated to each other with the back surface of one resonator bonded to the back surface the other resonator. Each resonator includes a piezoelectric substrate and a pair of IDT electrodes which are arranged on the front surface of the piezoelectric substrate. The acceleration detection element is supported at the end thereof so that the acceleration detection element is deflected in the direction of thickness under acceleration. Acceleration is detected by detecting a difference between frequency changes of the two surface acoustic wave resonators or a difference between impedance changes of the two surface acoustic wave resonators, which takes place under acceleration.Type: ApplicationFiled: October 9, 2001Publication date: September 12, 2002Applicant: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Patent number: 6429670Abstract: A piezoelectric sensor has a piezoelectric element having a specific axis of sensitivity and a package for the piezoelectric element. The package has a rectangular parallelopiped configuration with opposite longitudinal end surfaces having a height-to-width ratio of about 1:1. External lead electrodes are formed to cover at least the longitudinal end surfaces. A method and apparatus for detecting if the sensor is disposed in the proper posture is also disclosed.Type: GrantFiled: December 22, 2000Date of Patent: August 6, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Mitsugu Ogiura, Toshihiko Unami
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Publication number: 20020069702Abstract: An acceleration sensor includes a first resonator and a second resonator which resonate at independent frequencies and each of which includes a piezoelectric body and electrodes arranged on both main surfaces thereof, and a first base plate and a second base plate. A first unimorph type acceleration detection element includes the first resonator bonded to one surface of the first base plate, and a second unimorph type acceleration detection element includes the second resonator bonded to one surface of the second base plate. Each of the first and second unimorph type acceleration detection elements is fixed at one longitudinal end thereof or opposed longitudinal ends thereof such that the first resonator and the second resonator are diametrically opposed to each other or are arranged to face each other to allow the first resonator and the second resonator to independently deflect in response to the application of acceleration.Type: ApplicationFiled: September 21, 2001Publication date: June 13, 2002Inventor: Jun Tabota
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Publication number: 20020047700Abstract: An acceleration sensor includes a bimorph type acceleration detection element including a first resonator and a second resonator, each resonator formed of a piezoelectric body and having electrodes arranged on both main surfaces thereof, and an intermediate layer. The acceleration detection element is produced by bonding the first resonator and the second resonator with the intermediate layer interposed therebetween. The acceleration detection element is supported at one longitudinal end or opposed longitudinal ends thereof so that the first and second resonators are integrally deflected under acceleration. The intermediate layer is hard enough to transfer flexural stress in one of the first and second resonator to the other of the first and second resonators and the vibration of the one of the first and second resonators is attenuated when the vibration is transmitted from the one to the other of the first and second resonators.Type: ApplicationFiled: September 20, 2001Publication date: April 25, 2002Applicant: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Patent number: 6360603Abstract: An acceleration sensor 1 includes a strip-like piezoelectric member 2 having first and second end portions, first and second signal output electrodes 3, 4 formed on a pair of main surfaces facing each other of the piezoelectric member 2, and an intermediate electrode 5 formed at the intermediate position in the direction connecting a pair of main surfaces so as to face the first and second signal output electrodes 3, 4. The piezoelectric member is supported at both ends of the piezoelectric member by first and second supporting members. Polarization treatment is provided to the central area of the piezoelectric member in the thickness direction. The first and second signal output electrodes 3, 4 are led to a first end portion of the piezoelectric member 2, and the intermediate electrode 5 is led to a second end portion of the piezoelectric member.Type: GrantFiled: October 4, 1999Date of Patent: March 26, 2002Assignee: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Patent number: 6353325Abstract: A piezoelectric sensor has a piezoelectric element having a specific axis of sensitivity and a package for the piezoelectric element. The package has a rectangular parallelopiped configuration with opposite longitudinal end surfaces having a height-to-width ratio of about 1:1. External lead electrodes are formed to cover at least the longitudinal end surfaces. A method and apparatus for detecting if the sensor is disposed in the proper posture is also disclosed.Type: GrantFiled: October 13, 1998Date of Patent: March 5, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Mitsugu Ogiura, Toshihiko Unami
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Publication number: 20020011109Abstract: An acceleration sensor module capable of performing sensitivity adjustment in a minimum arrangement without containing an amplifier includes an acceleration sensor and a trimmable resistor which are mounted on a printed wiring board. At least one terminal of the acceleration sensor and at least one terminal of the trimmable resistor are connected to at least one external connection terminal of the printed circuit board through printed wiring.Type: ApplicationFiled: November 16, 1999Publication date: January 31, 2002Inventor: JUN TABOTA
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Publication number: 20010015103Abstract: A piezoelectric sensor has a piezoelectric element having a specific axis of sensitivity and a package for the piezoelectric element. The package has a rectangular parallelopiped configuration with opposite longitudinal end surfaces having a height-to-width ratio of about 1:1. External lead electrodes are formed to cover at least the longitudinal end surfaces. A method and apparatus for detecting if the sensor is disposed in the proper posture is also disclosed.Type: ApplicationFiled: December 22, 2000Publication date: August 23, 2001Applicant: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Mitsugu Ogiura, Toshihiko Unami
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Patent number: 6233801Abstract: A method of making an acceleration detecting element includes preparing two green sheets having a rectangular plate shape and being made of piezoelectric ceramic; applying a conductive paste on a center location and locations along the longitudinal direction of the first face of the first one of the green sheets thereby forming respective inner electrode patterns; laminating the first face of the second of the green sheets on the first face of the first one of the green sheets on which the inner electrode patterns have been formed; baking to simultaneously form inner electrodes and piezoelectric ceramic bodies; forming signal output electrodes by a baking treatment after applying the conductive paste on the main second surfaces of the piezoelectric ceramic bodies; and polarizing center portions and end portions of the piezoelectric ceramic bodies by using the respective signal output electrodes and the respective inner electrodes.Type: GrantFiled: March 5, 1998Date of Patent: May 22, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Toshihiko Unami, Jiro Inoue
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Patent number: 6094984Abstract: An acceleration sensor 1 comprises a circuit board 3 on which an acceleration detecting element 2 is carried. A plurality of connecting terminals 4 arranged along the periphery of the circuit board 3 are projected outward after penetrating through a metal base plate 5. The metal base plate 5 is fixed to the connecting terminals 4 spaced apart from the circuit board 3 by a predetermined distance in a state being insulated from the connecting terminals 4. The peripheral edge of the metal base plate 5 is connected to a case 7 covering the entire acceleration sensor 1. Circuit elements constituting a signal processing circuit for processing a detection signal of the acceleration detecting element 2 are arranged on the upper surface and the lower surface of the circuit board 3.Type: GrantFiled: September 8, 1997Date of Patent: August 1, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroshi Asano, Jun Tabota, Muneharu Yamashita, Toshihiro Mizuno, Masayuki Ichimaru
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Patent number: 6043588Abstract: A piezoelectric sensor has a piezoelectric element having a specific axis of sensitivity and a package for the piezoelectric element. The package has a rectangular parrallelopiped configuration with opposite longitudinal end surfaces having a height-to-width ratio of about 1:1. External lead electrodes are formed to cover at least the longitudinal end surfaces. A method and apparatus for detecting if the sensor is disposed in the proper posture is also disclosed.Type: GrantFiled: July 18, 1996Date of Patent: March 28, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Mitsugu Ogiura, Toshihiko Unami
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Patent number: 6021671Abstract: An acceleration sensor includes a circuit substrate and an acceleration detection element. The acceleration detection element is mounted on the circuit substrate and formed by using a piezoelectric body and is constructed so as to detect an acceleration which acts in a shearing direction. An electrode formed on the circuit substrate and an electrode on the bottom surface of the acceleration detection element are bonded together via a conductive bonding material so that they do not have direct contact with each other.Type: GrantFiled: August 5, 1998Date of Patent: February 8, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Keiichi Kami, Jun Tabota
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Patent number: 5991988Abstract: In a piezoelectric element (21), an internal electrode (31) is embedded in a piezoelectric ceramic body (22) to extend in its longitudinal direction, first to third surface electrodes (23 to 25, 27 to 29) are formed on upper and lower surfaces of the piezoelectric ceramic body (22) in first to third portions along the longitudinal direction, connecting electrodes (26, 30) are formed to connect the first to third surface electrodes (23 to 25, 27 to 29) with each other, the first to third portions are so polarized that the second portion is oppositely polarized to the first to third portions, and regions located above and under the internal electrode are polarized in opposite directions in the respective ones of the first to third portions.Type: GrantFiled: November 22, 1996Date of Patent: November 30, 1999Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Toshihiko Unami, Jiro Inoue
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Patent number: 5942685Abstract: An acceleration sensor is able to reduce the mount space thereof and to prevent detection precision from being lowered by yawing when external force is applied. The acceleration sensor reduces the mount space by attaching a circuit substrate so as to extend perpendicularly to a mounting substrate, and prevents detection precision from being lowered by yawing of the circuit substrate by setting the acceleration detecting direction of an acceleration detecting device mounted on the circuit substrate parallel to the main surfaces of both the mounting substrate and the circuit substrate.Type: GrantFiled: September 2, 1997Date of Patent: August 24, 1999Assignee: Murata Manufacturing Co., Ltd.Inventor: Jun Tabota
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Patent number: 5914556Abstract: A piezoelectric element includes an internal electrode embedded in a piezoelectric ceramic body so as to extend in a longitudinal direction of the body. First to third surface electrodes are formed on upper and lower surfaces of the piezoelectric ceramic body in respective first to third portions along the longitudinal direction. Connecting electrodes are formed to connect the first to third surface electrodes with each other. The first to third portions are polarized so that the second portion is polarized opposite to the polarization of the first and third portions, and regions located above and below the internal electrode are polarized in opposite directions in the respective ones of the first to third portions.Type: GrantFiled: June 2, 1995Date of Patent: June 22, 1999Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Tabota, Toshihiko Unami, Jiro Inoue