Patents by Inventor Toru Yahagi
Toru Yahagi 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: 10714632Abstract: An electrostatic sensing device includes a sensor oxide semiconductor TFT, and a controller configured to control the sensor oxide semiconductor TFT. The sensor oxide semiconductor TFT includes an oxide semiconductor active layer, a source electrode connected with the oxide semiconductor active layer, a drain electrode connected with the oxide semiconductor active layer, a gate electrode behind the oxide semiconductor active layer, and a gate insulating layer between the gate electrode and the oxide semiconductor active layer The controller is configured to measure a difference from a reference current of a current flowing between the source electrode and the drain electrode, while applying a driving voltage to the gate electrode, and determine polarity of electrostatic charge of the measurement target based on direction of the difference from the reference current.Type: GrantFiled: December 14, 2018Date of Patent: July 14, 2020Assignee: TIANMA JAPAN, LTD.Inventors: Kazushige Takechi, Shinnosuke Iwamatsu, Yutaka Abe, Yutaka Murakami, Toru Yahagi, Mutsuto Katoh
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Patent number: 10538800Abstract: A TFT biosensor includes a gate electrode (silicon substrate), a reference electrode, and enzyme that is fixed to an insulating substrate spatially separated from the gate electrode and the reference electrode. A pH variation in the vicinity of an ion-sensitive insulating film is induced by a reaction between the enzyme and a sensing object material. The TFT biosensor can detect a concentration of the sensing object material with high sensitivity by detecting the pH variation as a threshold voltage shift of characteristics of a gate-source voltage to a source-drain current.Type: GrantFiled: July 9, 2019Date of Patent: January 21, 2020Assignee: TIANMA MICROELECTRONICS CO., LTD.Inventors: Kazushige Takechi, Shinnosuke Iwamatsu, Yutaka Abe, Toru Yahagi, Shunsuke Konno, Mutsuto Katoh
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Publication number: 20190330674Abstract: A TFT biosensor includes a gate electrode (silicon substrate), a reference electrode, and enzyme that is fixed to an insulating substrate spatially separated from the gate electrode and the reference electrode. A pH variation in the vicinity of an ion-sensitive insulating film is induced by a reaction between the enzyme and a sensing object material. The TFT biosensor can detect a concentration of the sensing object material with high sensitivity by detecting the pH variation as a threshold voltage shift of characteristics of a gate-source voltage to a source-drain current.Type: ApplicationFiled: July 9, 2019Publication date: October 31, 2019Applicant: Tianma Japan, Ltd.Inventors: Kazushige TAKECHI, Shinnosuke IWAMATSU, Yutaka ABE, Toru YAHAGI, Shunsuke KONNO, Mutsuto KATOH
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Patent number: 10385377Abstract: A TFT biosensor includes a gate electrode (silicon substrate), a reference electrode, and enzyme that is fixed to an insulating substrate spatially separated from the gate electrode and the reference electrode. A pH variation in the vicinity of an ion-sensitive insulating film is induced by a reaction between the enzyme and a sensing object material. The TFT biosensor can detect a concentration of the sensing object material with high sensitivity by detecting the pH variation as a threshold voltage shift of characteristics of a gate-source voltage to a source-drain current.Type: GrantFiled: September 16, 2016Date of Patent: August 20, 2019Assignee: NLT TECHNOLOGIES, LTD.Inventors: Kazushige Takechi, Shinnosuke Iwamatsu, Yutaka Abe, Toru Yahagi, Shunsuke Konno, Mutsuto Katoh
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Publication number: 20190198678Abstract: An electrostatic sensing device includes a sensor oxide semiconductor TFT, and a controller configured to control the sensor oxide semiconductor TFT. The sensor oxide semiconductor TFT includes an oxide semiconductor active layer, a source electrode connected with the oxide semiconductor active layer, a drain electrode connected with the oxide semiconductor active layer, a gate electrode behind the oxide semiconductor active layer, and a gate insulating layer between the gate electrode and the oxide semiconductor active layer The controller is configured to measure a difference from a reference current of a current flowing between the source electrode and the drain electrode, while applying a driving voltage to the gate electrode, and determine polarity of electrostatic charge of the measurement target based on direction of the difference from the reference current.Type: ApplicationFiled: December 14, 2018Publication date: June 27, 2019Inventors: Kazushige TAKECHI, Shinnosuke IWAMATSU, Yutaka ABE, Yutaka MURAKAMI, Toru YAHAGI, Mutsuto KATOH
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Patent number: 9664642Abstract: The ion sensors using TFT or MOSFET are low in the measurement sensitivity so that it is difficult to detect an extremely small amount of sensing-target substance. A TFT ion sensor includes both a gate electrode (a silicon substrate) and a reference electrode, in which the electrostatic capacitance of a gate insulating film (a thermal oxide film) is set to be larger than the electrostatic capacitance of an ion sensitive insulating film. Therefore, it is possible to detect the concentration of ions, hormones, and the like in a sensing-target substance from the shift in the threshold voltage of the gate-source voltage to source-drain current property.Type: GrantFiled: March 27, 2015Date of Patent: May 30, 2017Assignee: NLT TECHNOLOGIES, LTD.Inventors: Kazushige Takechi, Hiroshi Haga, Shinnosuke Iwamatsu, Seiya Kobayashi, Yutaka Abe, Toru Yahagi
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Publication number: 20170082570Abstract: A TFT biosensor includes a gate electrode (silicon substrate), a reference electrode, and enzyme that is fixed to an insulating substrate spatially separated from the gate electrode and the reference electrode. A pH variation in the vicinity of an ion-sensitive insulating film is induced by a reaction between the enzyme and a sensing object material. The TFT biosensor can detect a concentration of the sensing object material with high sensitivity by detecting the pH variation as a threshold voltage shift of characteristics of a gate-source voltage to a source-drain current.Type: ApplicationFiled: September 16, 2016Publication date: March 23, 2017Applicant: NLT TECHNOLOGIES, LTD.Inventors: Kazushige TAKECHI, Shinnosuke IWAMATSU, Yutaka ABE, Toru YAHAGI, Shunsuke KONNO, Mutsuto KATOH
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Patent number: 9378981Abstract: With a TFT using an oxide semiconductor film, there is such an issue that oxygen deficit is generated in a surface region of the oxide semiconductor film after performing plasma etching of a source/drain electrode, thereby increasing the off-current. Provided is a TFT which includes: a gate electrode on an insulating substrate; a gate insulating film on the gate electrode; an oxide semiconductor film containing indium on the gate insulating film; and a source/drain electrode on the oxide semiconductor film. Further, the peak position derived from an indium 3d orbital in the XPS spectrum of a surface layer in a part of the oxide semiconductor film where the source/drain electrode is not superimposed is shifted towards a high energy side than the peak position derived from the indium 3d orbital in the XPS spectrum of an oxide semiconductor region existing in a lower part of the surface layer.Type: GrantFiled: April 15, 2015Date of Patent: June 28, 2016Assignee: NLT TECHNOLOGIES, LTD.Inventors: Kazushige Takechi, Shinnosuke Iwamatsu, Seiya Kobayashi, Yoshiyuki Watanabe, Toru Yahagi
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Publication number: 20150279698Abstract: With a TFT using an oxide semiconductor film, there is such an issue that oxygen deficit is generated in a surface region of the oxide semiconductor film after performing plasma etching of a source/drain electrode, thereby increasing the off-current. Provided is a TFT which includes: a gate electrode on an insulating substrate; a gate insulating film on the gate electrode; an oxide semiconductor film containing indium on the gate insulating film; and a source/drain electrode on the oxide semiconductor film. Further, the peak position derived from an indium 3d orbital in the XPS spectrum of a surface layer in a part of the oxide semiconductor film where the source/drain electrode is not superimposed is shifted towards a high energy side than the peak position derived from the indium 3d orbital in the XPS spectrum of an oxide semiconductor region existing in a lower part of the surface layer.Type: ApplicationFiled: April 15, 2015Publication date: October 1, 2015Applicant: NLT TECHNOLOGIES, LTD.Inventors: Kazushige TAKECHI, Shinnosuke IWAMATSU, Seiya KOBAYASHI, Yoshiyuki WATANABE, Toru YAHAGI
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Publication number: 20150276663Abstract: The ion sensors using TFT or MOSFET are low in the measurement sensitivity so that it is difficult to detect an extremely small amount of sensing-target substance. A TFT ion sensor includes both a gate electrode (a silicon substrate) and a reference electrode, in which the electrostatic capacitance of a gate insulating film (a thermal oxide film) is set to be larger than the electrostatic capacitance of an ion sensitive insulating film. Therefore, it is possible to detect the concentration of ions, hormones, and the like in a sensing-target substance from the shift in the threshold voltage of the gate-source voltage to source-drain current property.Type: ApplicationFiled: March 27, 2015Publication date: October 1, 2015Inventors: Kazushige TAKECHI, Hiroshi HAGA, Shinnosuke IWAMATSU, Seiya KOBAYASHI, Yutaka ABE, Toru YAHAGI
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Patent number: 9048319Abstract: With a TFT using an oxide semiconductor film, there is such an issue that oxygen deficit is generated in a surface region of the oxide semiconductor film after performing plasma etching of a source/drain electrode, thereby increasing the off-current. Provided is a TFT which includes: a gate electrode on an insulating substrate; a gate insulating film on the gate electrode; an oxide semiconductor film containing indium on the gate insulating film; and a source/drain electrode on the oxide semiconductor film. Further, the peak position derived from an indium 3d orbital in the XPS spectrum of a surface layer in a part of the oxide semiconductor film where the source/drain electrode is not superimposed is shifted towards a high energy side than the peak position derived from the indium 3d orbital in the XPS spectrum of an oxide semiconductor region existing in a lower part of the surface layer.Type: GrantFiled: August 14, 2012Date of Patent: June 2, 2015Assignee: NLT Technologies, Ltd.Inventors: Kazushige Takechi, Shinnosuke Iwamatsu, Seiya Kobayashi, Yoshiyuki Watanabe, Toru Yahagi
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Publication number: 20130043467Abstract: With a TFT using an oxide semiconductor film, there is such an issue that oxygen deficit is generated in a surface region of the oxide semiconductor film after performing plasma etching of a source/drain electrode, thereby increasing the off-current. Provided is a TFT which includes: a gate electrode on an insulating substrate; a gate insulating film on the gate electrode; an oxide semiconductor film containing indium on the gate insulating film; and a source/drain electrode on the oxide semiconductor film. Further, the peak position derived from an indium 3d orbital in the XPS spectrum of a surface layer in a part of the oxide semiconductor film where the source/drain electrode is not superimposed is shifted towards a high energy side than the peak position derived from the indium 3d orbital in the XPS spectrum of an oxide semiconductor region existing in a lower part of the surface layer.Type: ApplicationFiled: August 14, 2012Publication date: February 21, 2013Applicant: NLT TECHNOLOGIES, LTD.Inventors: Kazushige TAKECHI, Shinnosuke IWAMATSU, Seiya KOBAYASHI, Yoshiyuki WATANABE, Toru YAHAGI
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Publication number: 20070219542Abstract: A surgical procedure for implanting a lens or strengthening material in a cornea without making a flap as is done in Lasik procedures. A femtosecond laser or some future developed laser which has the same ability is modified to cut a pocket in the stroma layer of a cornea with no side cuts and only an opening at the surface of a cornea. Alternatively, a modified microkeratome shaped and sized to form the desired shape for a passageway bed cut which is cut to join a central bed cut. Alternatively, the passageway bed cut can be done using a femtosecond laser or some future developed laser which has the same ability. The passageway bed cut is smaller in dimension than a central bed cut of a pocket in which the lens will be implanted in procedures where an expandable lens or strengthening material is used. A modified microkeratome having a web, a central blade shaped to form the passageway bed cut and sled runner on either side of the blade and separated therefrom is also disclosed.Type: ApplicationFiled: March 15, 2006Publication date: September 20, 2007Inventor: Toru Yahagi