Patents by Inventor Toshio Imanishi
Toshio Imanishi 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: 10938325Abstract: A self-oscillating piezoelectric actuator drive circuit includes a integrating circuit; an inverter (INV1), inverters (INV2 and INV3) inverting an output signal of the inverter (INV1), sense resistors (Rs1 and Rs2) connected to output sides of the inverters (INV2 and INV3), a positive feedback resistor (Rfb2) feeding back an output signal of the inverters (INV2 and INV3) to the integrating circuit; and a negative feedback resistor (Rfb1) feeding back a voltage generated from the sense resistors (Rs1 and Rs2, Rs1<Rs2 in terms of a resistance value) to the integrating circuit. In a startup state, the sense resistor (Rs2) and the inverter (INV3) are selected, and in an operating state after the startup state, the sense resistor (Rs1) and the inverter (INV2) are selected.Type: GrantFiled: October 18, 2016Date of Patent: March 2, 2021Assignees: NEW JAPAN RADIO CO., LTD., MURATA MANUFACTURING CO., LTD.Inventors: Yasuyuki Endou, Toshio Imanishi, Hitoshi Matsuno
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Patent number: 10461697Abstract: An oscillation circuits that provides stable oscillations even when the amount of phase rotation of a piezoelectric resonator is small or fluctuates. The oscillation circuit includes a first amplifier having an input and an output, and a piezoelectric resonator connected between the input and the output of the first amplifier. Moreover, the oscillation circuit feeds, back to the input, a current flowing from the output of the first amplifier to the piezoelectric resonator. The oscillation circuit further includes an alternating-voltage waveform shaping circuit that applies, to the piezoelectric resonator, an alternating-voltage waveform having rising portions sharper than those of a sine wave.Type: GrantFiled: February 27, 2017Date of Patent: October 29, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Toshio Imanishi, Hitoshi Matsuno
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Publication number: 20190245133Abstract: A piezoelectric device that includes: a diaphragm; a supporting part configured to support at least a portion of an end of the diaphragm; a piezoelectric film disposed along a portion supported by the supporting part on the diaphragm, a width of the film along the supported portion being narrower than a width of the portion; a lower electrode disposed at a face of the piezoelectric film on a diaphragm side; and an upper electrode disposed on a face of the piezoelectric film on an opposite side to the diaphragm.Type: ApplicationFiled: April 16, 2019Publication date: August 8, 2019Inventors: Keiichi Umeda, Toshio Imanishi, Ville Kaajakari
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Patent number: 10312427Abstract: A piezoelectric device that includes: a diaphragm; a supporting part configured to support at least a portion of an end of the diaphragm; a piezoelectric film disposed along a portion supported by the supporting part on the diaphragm, a width of the film along the supported portion being narrower than a width of the portion; a lower electrode disposed at a face of the piezoelectric film on a diaphragm side; and an upper electrode disposed on a face of the piezoelectric film on an opposite side to the diaphragm.Type: GrantFiled: June 6, 2016Date of Patent: June 4, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Keiichi Umeda, Toshio Imanishi, Ville Kaajakari
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Publication number: 20180309391Abstract: A self-oscillating piezoelectric actuator drive circuit includes a integrating circuit; an inverter (INV1), inverters (INV2 and INV3) inverting an output signal of the inverter (INV1), sense resistors (Rs1 and Rs2) connected to output sides of the inverters (INV2 and INV3), a positive feedback resistor (Rfb2) feeding back an output signal of the inverters (INV2 and INV3) to the integrating circuit; and a negative feedback resistor (Rfb1) feeding back a voltage generated from the sense resistors (Rs1 and Rs2, Rs1<Rs2 in terms of a resistance value) to the integrating circuit. In a startup state, the sense resistor (Rs2) and the inverter (INV3) are selected, and in an operating state after the startup state, the sense resistor (Rs1) and the inverter (INV2) are selected.Type: ApplicationFiled: October 18, 2016Publication date: October 25, 2018Inventors: Yasuyuki ENDOU, Toshio IMANISHI, Hitoshi MATSUNO
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Publication number: 20170170786Abstract: An oscillation circuits that provides stable oscillations even when the amount of phase rotation of a piezoelectric resonator is small or fluctuates. The oscillation circuit includes a first amplifier having an input and an output, and a piezoelectric resonator connected between the input and the output of the first amplifier. Moreover, the oscillation circuit feeds, back to the input, a current flowing from the output of the first amplifier to the piezoelectric resonator. The oscillation circuit further includes an alternating-voltage waveform shaping circuit that applies, to the piezoelectric resonator, an alternating-voltage waveform having rising portions sharper than those of a sine wave.Type: ApplicationFiled: February 27, 2017Publication date: June 15, 2017Inventors: TOSHIO IMANISHI, Hitoshi Matsuno
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Publication number: 20160284974Abstract: A piezoelectric device that includes: a diaphragm; a supporting part configured to support at least a portion of an end of the diaphragm; a piezoelectric film disposed along a portion supported by the supporting part on the diaphragm, a width of the film along the supported portion being narrower than a width of the portion; a lower electrode disposed at a face of the piezoelectric film on a diaphragm side; and an upper electrode disposed on a face of the piezoelectric film on an opposite side to the diaphragm.Type: ApplicationFiled: June 6, 2016Publication date: September 29, 2016Inventors: KEIICHI UMEDA, Toshio Imanishi, Ville Kaajakari
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Publication number: 20160133824Abstract: An actuator that includes a plate-like elastic member. When seen from a first principal surface side in a plan view, the plate-like elastic member has a shape in which the elastic member extends along a circular arc-shaped center line. The plate-like elastic member is torsionally displaced relative to the circular arc-shaped center line as a central axis.Type: ApplicationFiled: January 5, 2016Publication date: May 12, 2016Inventors: Kenji Kagayama, Toshio Imanishi, Hiroaki Kaida
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Publication number: 20150162523Abstract: A piezoelectric device that includes: a diaphragm; a supporting part configured to support at least a portion of an end of the diaphragm; a piezoelectric film disposed along a portion supported by the supporting part on the diaphragm, a width of the film along the supported portion being narrower than a width of the portion; a lower electrode disposed at a face of the piezoelectric film on a diaphragm side; and an upper electrode disposed on a face of the piezoelectric film on an opposite side to the diaphragm.Type: ApplicationFiled: December 6, 2013Publication date: June 11, 2015Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Keiichi Umeda, Toshio Imanishi, Ville Kaajakari
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Patent number: 8942393Abstract: A piezoelectric sound component that includes a resin sheet, a piezoelectric diaphragm, and a casing. The piezoelectric diaphragm vibrates by bending, and is attached to at least part of a central portion of the resin sheet excluding a peripheral portion of the resin sheet. The casing holds the peripheral portion of the resin sheet. The casing supports at least one corner portion of the piezoelectric diaphragm.Type: GrantFiled: December 23, 2011Date of Patent: January 27, 2015Assignee: Murata Manufacturing Co., Ltd.Inventors: Masakazu Yamauchi, Toshio Imanishi
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Patent number: 8818014Abstract: A sound production component that includes a vibration element, a support member, and a connection part. The vibration element includes a polygonal vibration plate and an electromechanical conversion element attached to the vibration plate. The connection part connects an entire periphery of the vibration plate to the support member. At least a portion of the connection part has a curved shape. The length of a portion of the connection part which connects each corner of the vibration plate and the support member is shorter than the length of a portion of the connection part which connects a central portion of each side edge of the vibration plate and the support member.Type: GrantFiled: October 19, 2012Date of Patent: August 26, 2014Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshio Imanishi, Yoshihiro Sonoda
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Publication number: 20120235939Abstract: A touch-panel-equipped electronic device having a display panel, a touch panel, vibration elements, and vibration propagation members. The touch panel is disposed above the display panel. The vibration elements are disposed lateral to the display panel. The vibration propagation members propagate vibrations of the vibration elements to the touch panel. Each vibration element is disposed such that a vibration direction of a vibration plate thereof is parallel to the normal direction of the display panel.Type: ApplicationFiled: May 10, 2012Publication date: September 20, 2012Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shinichiro Sakaguchi, Kazunari Tagata, Toshio Imanishi
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Publication number: 20120163638Abstract: A piezoelectric sound component that includes a resin sheet, a piezoelectric diaphragm, and a casing. The piezoelectric diaphragm vibrates by bending, and is attached to at least part of a central portion of the resin sheet excluding a peripheral portion of the resin sheet. The casing holds the peripheral portion of the resin sheet. The casing supports at least one corner portion of the piezoelectric diaphragm.Type: ApplicationFiled: December 23, 2011Publication date: June 28, 2012Inventors: Masakazu Yamauchi, Toshio Imanishi
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Patent number: 6833655Abstract: A monolithic piezoelectric transformer includes a drive portion and a power generation portion. The drive portion includes a plurality of polarized piezoelectric ceramic layers and a plurality of internal electrodes that are alternately layered on each other. The drive portion is provided with external input electrodes connected to the internal electrodes. The power generation portion includes a piezoelectric ceramic member and an output electrode. The internal electrodes are formed of a fired metal containing at least one of silver and palladium and at least one of rhodium and iridium.Type: GrantFiled: June 4, 2003Date of Patent: December 21, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Takahiro Matto, Toshiaki Kaji, Toshio Imanishi
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Patent number: 6758927Abstract: A method for making a monolithic piezoelectric ceramic element having high mechanical strength, excellent piezoelectricity, and high reliability is disclosed. The method includes the steps of applying a conductive paste including a conductor containing Ag as a principal ingredient to ceramic green sheets comprising a piezoelectric ceramic material containing a Pb compound, stacking the ceramic green sheets to form a laminate, and firing the laminate in an atmosphere with an oxygen concentration of about 90% by volume or more during the heating period and with an oxygen concentration of about 5% to 15% by volume during the isothermal period and during the cooling period.Type: GrantFiled: January 16, 2003Date of Patent: July 6, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshiaki Kaji, Toshio Imanishi
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Publication number: 20040000845Abstract: A monolithic piezoelectric transformer includes a drive portion and a power generation portion. The drive portion includes a plurality of polarized piezoelectric ceramic layers and a plurality of internal electrodes that are alternately layered on each other. The drive portion is provided with external input electrodes connected to the internal electrodes. The power generation portion includes a piezoelectric ceramic member and an output electrode. The internal electrodes are formed of a fired metal containing at least one of silver and palladium and at least one of rhodium and iridium.Type: ApplicationFiled: June 4, 2003Publication date: January 1, 2004Inventors: Takahiro Matto, Toshiaki Kaji, Toshio Imanishi
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Publication number: 20030163908Abstract: A method for making a monolithic piezoelectric ceramic element having high mechanical strength, excellent piezoelectricity, and high reliability is disclosed. The method includes the steps of applying a conductive paste including a conductor containing Ag as a principal ingredient to ceramic green sheets comprising a piezoelectric ceramic material containing a Pb compound, stacking the ceramic green sheets to form a laminate, and firing the laminate in an atmosphere with an oxygen concentration of about 90% by volume or more during the heating period and with an oxygen concentration of about 5% to 15% by volume during the isothermal period and during the cooling period.Type: ApplicationFiled: January 16, 2003Publication date: September 4, 2003Inventors: Toshiaki Kaji, Toshio Imanishi