Patents by Inventor Takeo Gokita
Takeo Gokita 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: 20230118914Abstract: Disclosed herein is a magnetic sensor that includes first and second magnetic structures each having an annular structure and arranged in a first direction with a magnetic gap interposed therebetween, a magnetosensitive element disposed on a magnetic path formed by the magnetic gap and has a sensitivity axis in the first direction, a first excitation coil wound around the first magnetic structure, and a second excitation coil wound around the second magnetic structure.Type: ApplicationFiled: October 14, 2022Publication date: April 20, 2023Applicants: TDK Corporation, TDK CorporationInventors: Takato FUKUI, Takeo GOKITA
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Patent number: 11442120Abstract: An object of the present invention is to provide a magnetic sensor capable of detecting a magnetic field to be measured through closed loop control even when the magnetic field is weak. A magnetic sensor includes magnetic layers 41 and 42 opposed to each other through a magnetic gap G1, a magneto-sensitive element R1 disposed on a magnetic path formed by the magnetic gap G1, and a compensation coil 60 generating canceling magnetic flux ?4 to cancel magnetic flux ?2 applied to the magneto-sensitive element R1. According to the present invention, magnetic flux ?2 flowing in the magnetic layers 41 and 42 each functioning as a yoke is applied to the magneto-sensitive element R1, so that even when a magnetic field to be measured is weak, it can be detected. In addition, closed loop control can be performed due to the presence of the compensation coil 60 that cancels magnetic flux ?2.Type: GrantFiled: March 11, 2019Date of Patent: September 13, 2022Assignee: TDK CORPORATIONInventor: Takeo Gokita
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Publication number: 20210116518Abstract: An object of the present invention is to provide a magnetic sensor capable of detecting a magnetic field to be measured through closed loop control even when the magnetic field is weak. A magnetic sensor includes magnetic layers 41 and 42 opposed to each other through a magnetic gap G1, a magneto-sensitive element R1 disposed on a magnetic path formed by the magnetic gap G1, and a compensation coil 60 generating canceling magnetic flux ?4 to cancel magnetic flux ?2 applied to the magneto-sensitive element R1. According to the present invention, magnetic flux ?2 flowing in the magnetic layers 41 and 42 each functioning as a yoke is applied to the magneto-sensitive element R1, so that even when a magnetic field to be measured is weak, it can be detected. In addition, closed loop control can be performed due to the presence of the compensation coil 60 that cancels magnetic flux ?2.Type: ApplicationFiled: March 11, 2019Publication date: April 22, 2021Applicant: TDK CorporationInventor: Takeo GOKITA
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Patent number: 7982640Abstract: A digital signal transmitting apparatus includes an encoder which converts parallel input signals of multiple channels into serial data in a manner synchronized with a first clock signal, and a decoder which converts the serial data into parallel output signals of the multiple channels in a manner synchronized with a second clock signal operating in a manner asynchronous with the first clock signal. The serial data has a different period and a different duty factor corresponding to each combination of the logical values of the parallel input signals of the multiple channels.Type: GrantFiled: September 30, 2009Date of Patent: July 19, 2011Assignee: TDK CorporationInventors: Reiji Okuno, Takakazu Imai, Takeo Gokita
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Publication number: 20100079316Abstract: A digital signal transmitting apparatus includes an encoder which converts parallel input signals of multiple channels into serial data in a manner synchronized with a first clock signal, and a decoder which converts the serial data into parallel output signals of the multiple channels in a manner synchronized with a second clock signal operating in a manner asynchronous with the first clock signal. The serial data has a different period and a different duty factor corresponding to each combination of the logical values of the parallel input signals of the multiple channels.Type: ApplicationFiled: September 30, 2009Publication date: April 1, 2010Applicant: TDK CORPORATIONInventors: Reiji Okuno, Takakazu Imai, Takeo Gokita
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Patent number: 7660134Abstract: A DC-DC converter has a switching circuit including switching elements at the high-side and at the low-side, an inductor connected to the output end of the switching circuit, a smoothing capacitor connected to the inductor, a switching control circuit for supplying a switching pulse to the switching elements, and a circuit. The circuit detects that a state that the switching element at the high side is switched off and the switching element at the low side is switched on is maintained for a predetermined period or longer. In this case, the circuit forcibly switches off the switching element at the low side.Type: GrantFiled: October 26, 2006Date of Patent: February 9, 2010Assignee: TDK CorporationInventors: Takakazu Imai, Takeo Gokita
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Patent number: 7579899Abstract: A temperature detection circuit includes a temperature dependent voltage generation circuit for generating a temperature dependent voltage VR, a bandgap circuit for generating a temperature independent voltage VBG, and a comparator for comparing the temperature dependent voltage VR generated in the temperature dependent voltage generation circuit with the temperature independent voltage VBG generated in the bandgap circuit, and based on the above comparison result, outputting a temperature detection signal which indicates the high-low relationship between the temperature dependent voltage VR and the temperature independent voltage VBG.Type: GrantFiled: December 27, 2006Date of Patent: August 25, 2009Assignee: TDK CorporationInventors: Tadao Senriuchi, Takeo Gokita
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Patent number: 7498784Abstract: A current flowing through a measuring target coil increases when a pulse signal is high. A voltage corresponding to instantaneous value of the current through the coil is input to input terminal. A blanking signal generator circuit generates signal which has predetermined pulse width and rises in synchronization with rise of the pulse signal. During period in which this signal is high, first switch becomes ON and first capacitor holds the voltage at the input terminal. A second switch becomes ON when first switch becomes OFF to connect second capacitor to connection node between resistors, and disconnects second capacitor from connection node when the pulse signal becomes low. Second capacitor is charged with voltage corresponding to average value of an amount of increase in the current through the coil. A voltage obtained by adding the voltage charged in first capacitor to this charged voltage is supplied to third capacitor.Type: GrantFiled: July 26, 2006Date of Patent: March 3, 2009Assignee: TDK CorporationInventors: Takeo Gokita, Takakazu Imai
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Publication number: 20070146047Abstract: A temperature detection circuit includes a temperature dependent voltage generation circuit for generating a temperature dependent voltage VR, a bandgap circuit for generating a temperature independent voltage VBG, and a comparator for comparing the temperature dependent voltage VR generated in the temperature dependent voltage generation circuit with the temperature independent voltage VBG generated in the bandgap circuit, and based on the above comparison result, outputting a temperature detection signal which indicates the high-low relationship between the temperature dependent voltage VR and the temperature independent voltage VBG.Type: ApplicationFiled: December 27, 2006Publication date: June 28, 2007Applicant: TDK CorporationInventors: Tadao Senriuchi, Takeo Gokita
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Publication number: 20070090821Abstract: A DC-DC converter has a switching circuit including switching elements at the high-side and at the low-side, an inductor connected to the output end of the switching circuit, a smoothing capacitor connected to the inductor, a switching control circuit for supplying a switching pulse to the switching elements, and a circuit. The circuit detects that a state that the switching element at the high side is switched off and the switching element at the low side is switched on is maintained for a predetermined period or longer. In this case, the circuit forcibly switches off the switching element at the low side.Type: ApplicationFiled: October 26, 2006Publication date: April 26, 2007Inventors: Takakazu Imai, Takeo Gokita
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Publication number: 20070025048Abstract: A current flowing through a measuring target coil increases when a pulse signal is high. A voltage corresponding to instantaneous value of the current through the coil is input to input terminal. A blanking signal generator circuit generates signal which has predetermined pulse width and rises in synchronization with rise of the pulse signal. During period in which this signal is high, first switch becomes ON and first capacitor holds the voltage at the input terminal. A second switch becomes ON when first switch becomes OFF to connect second capacitor to connection node between resistors, and disconnects second capacitor from connection node when the pulse signal becomes low. Second capacitor is charged with voltage corresponding to average value of an amount of increase in the current through the coil. A voltage obtained by adding the voltage charged in first capacitor to this charged voltage is supplied to third capacitor.Type: ApplicationFiled: July 26, 2006Publication date: February 1, 2007Applicant: TDK CORPORATIONInventors: Takeo Gokita, Takakazu Imai