Patents by Inventor Yukihira Nakazato
Yukihira Nakazato 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: 20230207246Abstract: In order to suppress the amount of time needed for the start-up of a microwave tube carried out when voltage fed from a power source has decreased, while avoiding increase in scale of a power storage unit, this power supply device includes: a power supply unit that supplies power fed from the power source to the microwave tube that is provided with a cathode, a heater for heating the cathode, an anode, and a collector; a power storage unit that stores the fed power and, if the voltage of the fed power decreases, supplies stored power that is power obtained by the power storing, to the microwave tube; and a power supply switching unit that, if the voltage of the fed power decreases, stops supplying the stored power to the anode and does not stop supplying the stored power to the heater.Type: ApplicationFiled: February 15, 2021Publication date: June 29, 2023Applicant: NEC Network and Sensor Systems, Ltd.Inventors: Naoki IIZUKA, Yukihira NAKAZATO
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Patent number: 10276339Abstract: The purpose is to make it possible to autonomously suppress a reduction in an electron beam without providing a means for supervising the electron beam intensity of a monitor or the like. An electron gun, provided with: a heater (12) in which one terminal serves as a heater terminal (H) and the other terminal serves as a shared terminal (HK), and in which a low-voltage power supply (21) is connected between the terminals, the heater (12) generating heat due to a current being supplied from the low-voltage power supply (21); and a cathode electrode (11) connected to the shared terminal (HK) and heated by the heater (12) to discharge thermal electrons. A cathode current (Ik) due to the thermal electrons discharged from the cathode electrode (11), and a current (Ih) due to the low-voltage power supply, flow in opposite directions through the heater (12).Type: GrantFiled: September 16, 2016Date of Patent: April 30, 2019Assignee: NEC NETWORK AND SENSOR SYSTEMS, LTD.Inventors: Yukihira Nakazato, Eiji Fujiwara
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Publication number: 20180286622Abstract: The purpose is to make it possible to autonomously suppress a reduction in an electron beam without providing a means for supervising the electron beam intensity of a monitor or the like. An electron gun, provided with: a heater (12) in which one terminal serves as a heater terminal (H) and the other terminal serves as a shared terminal (HK), and in which a low-voltage power supply (21) is connected between the terminals, the heater (12) generating heat due to a current being supplied from the low-voltage power supply (21); and a cathode electrode (11) connected to the shared terminal (HK) and heated by the heater (12) to discharge thermal electrons. A cathode current (Ik) due to the thermal electrons discharged from the cathode electrode (11), and a current (Ih) due to the low-voltage power supply, flow in opposite directions through the heater (12).Type: ApplicationFiled: September 16, 2016Publication date: October 4, 2018Applicant: NEC NETWORK AND SENSOR SYSTEMS, LTD.Inventors: Yukihira NAKAZATO, Eiji FUJIWARA
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Patent number: 8981799Abstract: A first resistor, a second resistor, a transistor, and a third resistor connected in series between a ground potential and an output terminal of a power circuit are provided. In addition, a current-detecting resistor is inserted in series between a high-voltage site and an output terminal of a power circuit that supplies a predetermined direct voltage to the high-voltage site. A differential amplifier controls a current flowing through the transistor so that a potential difference generated between both ends of the third resistor becomes proportional to a potential difference generated between both ends of the current-detecting resistor. At this point, by measuring the voltage of a connection node of the first resistor and the second resistor, the value of a current flowing through the high-voltage site can be calculated from the measured value.Type: GrantFiled: November 23, 2009Date of Patent: March 17, 2015Assignee: Netcomsec Co.LtdInventor: Yukihira Nakazato
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Patent number: 8905634Abstract: A temperature detection apparatus includes a transformer, a thermostat attached directly to an electrically conductive site of the heating element and has contacts that become short-circuited or come into an open-circuit condition depending on whether or not the temperature of the heating element is equal to or higher than a predetermined value, the contacts being connected to a secondary coil in the transformer, a DC voltage source and a transistor configured to supply required AC power to a primary coil in the transformer, a current detection resistor configured to detect a current flowing through the primary coil in the transformer, and a comparison circuit detecting a voltage generated across the current detection resistor when a current flows through the current detection resistor, the comparison circuit outputting an alarm signal when the current flowing through the primary coil in the transformer exceeds a preset threshold current.Type: GrantFiled: May 29, 2013Date of Patent: December 9, 2014Assignee: Netcomsec Co. LtdInventors: Yukihira Nakazato, Junichi Matsuoka
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Publication number: 20130259089Abstract: A temperature detection apparatus includes a transformer, a thermostat attached directly to an electrically conductive site of the heating element and has contacts that become short-circuited or come into an open-circuit condition depending on whether or not the temperature of the heating element is equal to or higher than a predetermined value, the contacts being connected to a secondary coil in the transformer, a DC voltage source and a transistor configured to supply required AC power to a primary coil in the transformer, a current detection resistor configured to detect a current flowing through the primary coil in the transformer, and a comparison circuit detecting a voltage generated across the current detection resistor when a current flows through the current detection resistor, the comparison circuit outputting an alarm signal when the current flowing through the primary coil in the transformer exceeds a preset threshold current.Type: ApplicationFiled: May 29, 2013Publication date: October 3, 2013Applicant: NEC MICROWAVE TUBE, LTD.Inventors: YUKIHIRA NAKAZATO, JUNICHI MATSUOKA
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Patent number: 8491187Abstract: A temperature detection apparatus includes a transformer, a thermostat attached directly to an electrically conductive site of the heating element and has contacts that become short-circuited or come into an open-circuit condition depending on whether or not the temperature of the heating element is equal to or higher than a predetermined value, the contacts being connected to a secondary coil in the transformer, a DC voltage source and a transistor configured to supply required AC power to a primary coil in the transformer, a current detection resistor configured to detect a current flowing through the primary coil in the transformer, and a comparison circuit detecting a voltage generated across the current detection resistor when a current flows through the current detection resistor, the comparison circuit outputting an alarm signal when the current flowing through the primary coil in the transformer exceeds a preset threshold current.Type: GrantFiled: October 5, 2009Date of Patent: July 23, 2013Assignee: NEC Microwave Tube, Ltd.Inventors: Yukihira Nakazato, Junichi Matsuoka
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Patent number: 8212481Abstract: A voltage control apparatus used for an electron tube or a power supply apparatus includes a detecting circuit for detecting current flowing through a helix electrode, a voltage-limiting circuit for controlling a potential difference between the helix electrode and the anode electrode based on a predetermined voltage level; and a switch for switching based on an output from the detecting circuit. The switch connects the helix electrode and the anode electrode through the voltage-limiting circuit, or causes a short circuit between the helix electrode and the anode electrode.Type: GrantFiled: March 2, 2009Date of Patent: July 3, 2012Assignee: NEC Microwave Tube, LtdInventor: Yukihira Nakazato
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Patent number: 7952288Abstract: The present invention includes a Zener diode connected between a helix electrode and an anode electrode, a transistor that closes or opens a circuit between a cathode and an anode of the Zener diode, a photocoupler for turning ON/OFF the transistor through a phototransistor, a first switch for supplying or cutting off a DC voltage for the photodiode of the photocoupler, a capacitor to which the DC voltage that is to be supplied to the photodiode is applied and a control unit that turns ON the first switch beforehand to apply a DC voltage to the photocoupler and the capacitor and that turns OFF the first switch simultaneously with an application of a helix voltage.Type: GrantFiled: October 10, 2008Date of Patent: May 31, 2011Assignee: NEC Microwave Tube, Ltd.Inventor: Yukihira Nakazato
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Patent number: 7898346Abstract: A power supply apparatus for a traveling-wave tube includes an electrical discharge switch and a first resistor that are serially connected, and that are connected between a cathode electrode and a first collector electrode; N (N denotes a positive integer) arresters that are serially connected, and that are inserted between a ground potential and a connection node of the electrical discharge switch and the first resistor; N second resistors that are inserted between the N arresters and a second collector electrode to an Nth collector electrode and a ground potential, respectively; and an electrical discharge control circuit that turns off the electrical discharge switch at a time of normal operation of the power supply apparatus and turns on the electrical discharge switch when stopping operation of the power supply apparatus.Type: GrantFiled: July 30, 2008Date of Patent: March 1, 2011Assignee: Netcomsec Co., Ltd.Inventors: Junichi Kobayashi, Yukihira Nakazato
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Patent number: 7800311Abstract: At the time of restoration of the power supply after a power failure, a voltage higher than that in the normal operation mode is supplied to a heater. After a lapse of a predetermined time, the voltage to be supplied to the heater is switched into the voltage in the normal operation mode while a control signal for stating the operation of an electron tube is output. Alternatively, at the time of power activation, the rate of change of current flowing through a heater is determined for every period of time. When the rate of change becomes equal to or lower than a predetermined threshold, a voltage higher than that in the normal operation mode is supplied to the heater, and after a lapse of a predetermined time, the voltage to be supplied to the heater is switched into the voltage in the normal operation mode while a control signal for stating the operation of the electron tube is output.Type: GrantFiled: March 18, 2008Date of Patent: September 21, 2010Assignee: Netcomsec Co. Ltd.Inventors: Akira Chiba, Yukihira Nakazato
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Publication number: 20100127720Abstract: A first resistor, a second resistor, a transistor, and a third resistor connected in series between a ground potential and an output terminal of a power circuit are provided. In addition, a current-detecting resistor is inserted in series between a high-voltage site and an output terminal of a power circuit that supplies a predetermined direct voltage to the high-voltage site. A differential amplifier controls a current flowing through the transistor so that a potential difference generated between both ends of the third resistor becomes proportional to a potential difference generated between both ends of the current-detecting resistor. At this point, by measuring the voltage of a connection node of the first resistor and the second resistor, the value of a current flowing through the high-voltage site can be calculated from the measured value.Type: ApplicationFiled: November 23, 2009Publication date: May 27, 2010Inventor: YUKIHIRA NAKAZATO
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Publication number: 20100091815Abstract: A temperature detection apparatus includes a transformer, a thermostat attached directly to an electrically conductive site of the heating element and has contacts that become short-circuited or come into an open-circuit condition depending on whether or not the temperature of the heating element is equal to or higher than a predetermined value, the contacts being connected to a secondary coil in the transformer, a DC voltage source and a transistor configured to supply required AC power to a primary coil in the transformer, a current detection resistor configured to detect a current flowing through the primary coil in the transformer, and a comparison circuit detecting a voltage generated across the current detection resistor when a current flows through the current detection resistor, the comparison circuit outputting an alarm signal when the current flowing through the primary coil in the transformer exceeds a preset threshold current.Type: ApplicationFiled: October 5, 2009Publication date: April 15, 2010Inventors: YUKIHIRA NAKAZATO, Junichi Matsuoka
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Patent number: 7652392Abstract: The present invention includes: a transformer; a primary source for supplying an alternating voltage of at least two frequencies to a primary winding of the transformer; and a filter circuit connected to a secondary winding of the transformer and having an attenuation that varies according to the frequency of the alternating voltage, where the frequency of the alternating voltage supplied to the primary winding of the transformer is controlled so that a desired alternating voltage is outputted from the filter circuit connected to the secondary winding of the transformer.Type: GrantFiled: August 6, 2007Date of Patent: January 26, 2010Assignee: NEC Microwave Tube, Ltd.Inventor: Yukihira Nakazato
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Publication number: 20090218948Abstract: A voltage control apparatus used for an electron tube or a power supply apparatus includes a detecting circuit for detecting current flowing through a helix electrode, a voltage-limiting circuit for controlling a potential difference between the helix electrode and the anode electrode based on a predetermined voltage level; and a switch for switching based on an output from the detecting circuit. The switch connects the helix electrode and the anode electrode through the voltage-limiting circuit, or causes a short circuit between the helix electrode and the anode electrode.Type: ApplicationFiled: March 2, 2009Publication date: September 3, 2009Inventor: Yukihira NAKAZATO
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Publication number: 20090096379Abstract: The present invention includes a Zener diode connected between a helix electrode and an anode electrode, a transistor that closes or opens a circuit between a cathode and an anode of the Zener diode, a photocoupler for turning ON/OFF the transistor through a phototransistor, a first switch for supplying or cutting off a DC voltage for the photodiode of the photocoupler, a capacitor to which the DC voltage that is to be supplied to the photodiode is applied and a control unit that turns ON the first switch beforehand to apply a DC voltage to the photocoupler and the capacitor and that turns OFF the first switch simultaneously with an application of a helix voltage.Type: ApplicationFiled: October 10, 2008Publication date: April 16, 2009Inventor: YUKIHIRA NAKAZATO
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Publication number: 20090033228Abstract: A power supply apparatus for a traveling-wave tube includes an electrical discharge switch and a first resistor that are serially connected, and that are connected between a cathode electrode and a first collector electrode; N (N denotes a positive integer) arresters that are serially connected, and that are inserted between a ground potential and a connection node of the electrical discharge switch and the first resistor; N second resistors that are inserted between the N arresters and a second collector electrode to an Nth collector electrode and a ground potential, respectively; and an electrical discharge control circuit that turns off the electrical discharge switch at a time of normal operation of the power supply apparatus and turns on the electrical discharge switch when stopping operation of the power supply apparatus.Type: ApplicationFiled: July 30, 2008Publication date: February 5, 2009Applicant: NEC Microwave Tube, Ltd.Inventors: Junichi KOBAYASHI, Yukihira NAKAZATO
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Publication number: 20080231197Abstract: At the time of restoration of the power supply after a power failure, a voltage higher than that in the normal operation mode is supplied to a heater. After a lapse of a predetermined time, the voltage to be supplied to the heater is switched into the voltage in the normal operation mode while a control signal for stating the operation of an electron tube is output. Alternatively, at the time of power activation, the rate of change of current flowing through a heater is determined for every period of time. When the rate of change becomes equal to or lower than a predetermined threshold, a voltage higher than that in the normal operation mode is supplied to the heater, and after a lapse of a predetermined time, the voltage to be supplied to the heater is switched into the voltage in the normal operation mode while a control signal for stating the operation of the electron tube is output.Type: ApplicationFiled: March 18, 2008Publication date: September 25, 2008Applicant: NEC MICROWAVE TUBE, LTD.Inventors: Akira CHIBA, Yukihira NAKAZATO
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Publication number: 20080054719Abstract: The present invention includes: a transformer; a primary source for supplying an alternating voltage of at least two frequencies to a primary winding of the transformer; and a filter circuit connected to a secondary winding of the transformer and having an attenuation that varies according to the frequency of the alternating voltage, where the frequency of the alternating voltage supplied to the primary winding of the transformer is controlled so that a desired alternating voltage is outputted from the filter circuit connected to the secondary winding of the transformer.Type: ApplicationFiled: August 6, 2007Publication date: March 6, 2008Applicant: NEC MICROWAVE TUBE, LTDInventor: Yukihira Nakazato