Patents by Inventor Takeshi Naka
Takeshi Naka 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: 7638994Abstract: A switching power supply circuit has a current mode control circuit including current detection means, and current mode signal generation means for generating a current mode signal being a drain current of a first MOS transistor obtained by supplying a first current information signal, which is an output signal of the current detection means, to the gate of the first MOS transistor, and by connecting a first resistance to the source of the first MOS transistor, and supplies the current mode signal to a feedback control system of the switching power supply circuit.Type: GrantFiled: June 5, 2007Date of Patent: December 29, 2009Assignees: Torex Semiconductor Ltd., Device Engineering Co. Ltd.Inventors: Norimasa Hane, Takeshi Naka
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Patent number: 7611813Abstract: Provided a toner including at least: toner particles each containing at least a binder resin, a release agent, and a colorant; and an inorganic fine powder, in which: a degree of aggregation Y1 at a time of compression (200 kpa) of the toner satisfies a relationship of 15?Y1?35, and a degree of aggregation Y2 at a time of non-compression of the toner satisfies a relationship of 7?Y2?15; and a highest endothermic peak of the toner is present in a temperature range of 30 to 200° C. in an endothermic curve measured with a differential scanning calorimeter (DSC), and a peak temperature Tsc (° C.) of the highest endothermic peak satisfies a relationship of 60?Tsc?130.Type: GrantFiled: January 30, 2007Date of Patent: November 3, 2009Assignee: Canon Kabushiki KaishaInventors: Tetsuya Ida, Takeshi Ootsu, Koh Ishigami, Naoki Okamoto, Nozomu Komatsu, Noriyoshi Umeda, Yoshinobu Baba, Takayuki Itakura, Takeshi Naka, Hirohide Tanikawa
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Patent number: 7545129Abstract: A switching power supply circuit comprises: current detection means for detecting a current flowing through an inductor; current holding means for holding the current flowing through the inductor over a past predetermined period; and current superposition means for adding to an output of an error amplifier a current superposition signal which makes an adjustment, based on a present current information signal as an output signal of the current detection means, such that the ON-period of a switching signal of a PWM comparator is shortened, and also makes an adjustment, based on a past current information signal as an output signal of the current holding means, such that the ON-period of the switching signal of the PWM comparator is lengthened.Type: GrantFiled: June 5, 2007Date of Patent: June 9, 2009Assignees: Torex Semiconductor Ltd., Device Engineering Co., Ltd.Inventors: Norimasa Hane, Takeshi Naka
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Patent number: 7518428Abstract: In a phase compensation circuit having a resistance connected to the output side of an error amplifier, a capacitor, and a conductance amplifier functioning as a capacitance amplifier circuit, capacitance is amplified by the conductance amplifier and used, whereby an essentially required capacitance is ensured, even when the capacitance of the capacitor is small.Type: GrantFiled: September 9, 2005Date of Patent: April 14, 2009Assignees: Torex Semiconductor Ltd., Device Engineering Co., Ltd.Inventors: Kouji Ichiba, Takeshi Naka
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Publication number: 20090079410Abstract: A DC/DC converter includes a main switching element and a subordinate switching element, and is arranged to supply power to load via a coil. The ON-time of a subordinate switching element in a succeeding cycle is controlled based on a period of time tdif from the time when the subordinate switching element is turned off until the time when voltage at the point of connection of the two switching elements reaches a predetermined threshold value.Type: ApplicationFiled: May 8, 2006Publication date: March 26, 2009Applicants: TOREX SEMICONDUCTOR LTD., DEVICE ENGINEERING CO., LTD.Inventors: Satoru Ohkawa, Norimasa Hane, Takeshi Naka
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Patent number: 7506830Abstract: In a toner production process having at least a kneading step, a pulverization step and the step of simultaneously carrying out a surface modification step and a classification step to obtain toner particles, the surface modification and the classification are simultaneously carried out using a batch-wise surface modifying apparatus having at least a cylindrical main-body casing, a classifying rotor, a surface modifying means having a dispersing rotor and a liner. The positional relationship between the dispersing rotor and the liner is set in an appropriate specific state so that toner particles having a narrow particle size distribution with less fine powder and having a high sphericity can be obtained with a good efficiency.Type: GrantFiled: February 22, 2008Date of Patent: March 24, 2009Assignee: Canon Kabushiki KaishaInventors: Takeshi Naka, Osamu Tamura
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Patent number: 7459895Abstract: In a power circuit which makes phase compensation by utilizing ESR of an output capacitor, a feedback signal based on an output voltage is supplied by a coupling capacitor to an N-channel MOS transistor on a saturated coupling side of a current mirror circuit inside an error amplification circuit.Type: GrantFiled: October 28, 2005Date of Patent: December 2, 2008Assignees: Torex Device Co., Ltd., Device Engineering Co., Ltd.Inventors: Atsunori Tokumitsu, Takeshi Naka
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Publication number: 20080149535Abstract: In a toner production process having at least a kneading step, a pulverization step and the step of simultaneously carrying out a surface modification step and a classification step to obtain toner particles, the surface modification and the classification are simultaneously carried out using a batch-wise surface modifying apparatus having at least a cylindrical main-body casing, a classifying rotor, a surface modifying means having a dispersing rotor and a liner. The positional relationship between the dispersing rotor and the liner is set in an appropriate specific state so that toner particles having a sharp particle size distribution with less fine powder and having a high sphericity can be obtained in a good efficiency.Type: ApplicationFiled: February 22, 2008Publication date: June 26, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Takeshi Naka, Osamu Tamura
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Patent number: 7358024Abstract: In a toner production process having at least a kneading step, a pulverization step and the step of simultaneously carrying out a surface modification step and a classification step to obtain toner particles, the surface modification and the classification are simultaneously carried out using a batch-wise surface modifying apparatus having at least a cylindrical main-body casing, a classifying rotor, a surface modifying means having a dispersing rotor and a liner. The positional relationship between the dispersing rotor and the liner is set in an appropriate specific state so that toner particles having a sharp particle size distribution with less fine powder and having a high sphericity can be obtained in a good efficiency.Type: GrantFiled: December 22, 2004Date of Patent: April 15, 2008Assignee: Canon Kabushiki KaishaInventors: Takeshi Naka, Osamu Tamura
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Publication number: 20080007235Abstract: A switching power supply circuit comprises: current detection means for detecting a current flowing through an inductor; current holding means for holding the current flowing through the inductor over a past predetermined period; and current superposition means for adding to an output of an error amplifier a current superposition signal which makes an adjustment, based on a present current information signal as an output signal of the current detection means, such that the ON-period of a switching signal of a PWM comparator is shortened, and also makes an adjustment, based on a past current information signal as an output signal of the current holding means, such that the ON-period of the switching signal of the PWM comparator is lengthened.Type: ApplicationFiled: June 5, 2007Publication date: January 10, 2008Applicants: Torex Semiconductor Ltd., Device Engineering Co., Ltd.Inventors: Norimasa Hane, Takeshi Naka
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Publication number: 20080007233Abstract: A switching power supply circuit has a current mode control circuit including current detection means, and current mode signal generation means for generating a current mode signal being a drain current of a first MOS transistor obtained by supplying a first current information signal, which is an output signal of the current detection means, to the gate of the first MOS transistor, and by connecting a first resistance to the source of the first MOS transistor, and supplies the current mode signal to a feedback control system of the switching power supply circuit.Type: ApplicationFiled: June 5, 2007Publication date: January 10, 2008Applicants: Torex Semiconductor Ltd., Device Engineering Co., Ltd.Inventors: Norimasa Hane, Takeshi Naka
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Publication number: 20070174017Abstract: In a phase compensation circuit having a resistance connected to the output side of an error amplifier, a capacitor, and a conductance amplifier functioning as a capacitance amplifier circuit, capacitance is amplified by the conductance amplifier and used, whereby an essentially required capacitance is ensured, even when the capacitance of the capacitor is small.Type: ApplicationFiled: September 9, 2005Publication date: July 26, 2007Inventors: Kouji Ichiba, Takeshi Naka
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Publication number: 20070122727Abstract: Provided a toner including at least: toner particles each containing at least a binder resin, a release agent, and a colorant; and an inorganic fine powder, in which: a degree of aggregation Y1 at a time of compression (200 kpa) of the toner satisfies a relationship of 15?Y1?35, and a degree of aggregation Y2 at a time of non-compression of the toner satisfies a relationship of 7?Y2?15; and a highest endothermic peak of the toner is present in a temperature range of 30 to 200° C. in an endothermic curve measured with a differential scanning calorimeter (DSC), and a peak temperature Tsc (° C.) of the highest endothermic peak satisfies a relationship of 60?Tsc?130.Type: ApplicationFiled: January 30, 2007Publication date: May 31, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ida, Takeshi Ootsu, Koh Ishigami, Naoki Okamoto, Nozomu Komatsu, Noriyoshi Umeda, Yoshinobu Baba, Takayuki Itakura, Takeshi Naka, Hirohide Tanikawa
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Patent number: 7142040Abstract: A stabilized power supply circuit includes a charge pump power supply circuit including four switching elements and a capacitor, and an error amplifier comparing the output voltage of the charge pump power supply circuit and a reference voltage and outputting an error signal on the basis of the difference therebetween. A current source is connected in series to the gate of a switching element formed of a MOSFET. The period during which electric charge is discharged from the gate is controlled in accordance with the error signal in order to maintain the output voltage constant.Type: GrantFiled: March 26, 2004Date of Patent: November 28, 2006Assignees: Device Engineering Co., Ltd., Torex Device Co., Ltd.Inventors: Takeshi Naka, Takashi Maegawa
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Patent number: 7135844Abstract: A control circuit for a DC/DC converter which includes a main switching element, a sub switching element, and a reactor in order to convert a DC input voltage to a DC output voltage. The control circuit comprises a clock signal generator for generating a clock signal during a blank period in which both the main and sub switching elements are off; a comparator for comparing a reference voltage and a voltage at a connection point between the main and sub switching elements and for outputting a comparison signal indicating a relation of magnitude between the reference voltage and the voltage at the connection point; and an operation mode switching section for monitoring the comparison signal at a timing corresponding to the clock signal in order to detect a voltage state at the connection point, and controlling the sub switching element in accordance with the voltage state.Type: GrantFiled: April 27, 2004Date of Patent: November 14, 2006Assignees: Torex Device Co., Ltd., Device Engineering Co., Ltd.Inventors: Norimasa Hane, Satoru Ohkawa, Takeshi Naka
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Publication number: 20060146583Abstract: A stabilized power supply circuit includes a charge pump power supply circuit including four switching elements and a capacitor, and an error amplifier comparing the output voltage of the charge pump power supply circuit and a reference voltage and outputting an error signal on the basis of the difference therebetween. A current source is connected in series to the gate of a switching element formed of a MOSFET. The period during which electric charge is discharged from the gate is controlled in accordance with the error signal in order to maintain the output voltage constant.Type: ApplicationFiled: March 26, 2004Publication date: July 6, 2006Inventors: Takeshi Naka, Takashi Maegawa
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Publication number: 20060091866Abstract: In a power circuit which makes phase compensation by utilizing ESR of an output capacitor, a feedback signal based on an output voltage is supplied by a coupling capacitor to an N-channel MOS transistor on a saturated coupling side of a current mirror circuit inside an error amplification circuit.Type: ApplicationFiled: October 28, 2005Publication date: May 4, 2006Inventors: Atsunori Tokumitsu, Takeshi Naka
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Publication number: 20050164115Abstract: A process for producing a toner with which toner particles can be highly conglobated, a toner that hardly causes fogging in an image, and an yield of toner is increased is provided. A process for producing a toner of the present invention comprises the step of simultaneously performing a surface modification and classification of particles by using a batch-wise surface modification apparatus, in which when a straight line extending from a central position S1 of a loading pipe in a direction of loading a raw material is denoted by L1 and a straight line extending from a central position O1 of the fine powder discharging pipe in a direction of discharging fine powder and ultra-fine powder is denoted by L2, an angle ? formed between the lines L1 and L2 is in a range of 210 to 330° with reference to the direction in which a classification rotor rotates.Type: ApplicationFiled: October 20, 2004Publication date: July 28, 2005Applicant: Canon Kabushiki KaishaInventors: Osamu Tamura, Takeshi Naka, Yutaka Ishida
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Publication number: 20050139701Abstract: In a toner production process having at least a kneading step, a pulverization step and the step of simultaneously carrying out a surface modification step and a classification step to obtain toner particles, the surface modification and the classification are simultaneously carried out using a batch-wise surface modifying apparatus having at least a cylindrical main-body casing, a classifying rotor, a surface modifying means having a dispersing rotor and a liner. The positional relationship between the dispersing rotor and the liner is set in an appropriate specific state so that toner particles having a sharp particle size distribution with less fine powder and having a high sphericity can be obtained in a good efficiency.Type: ApplicationFiled: December 22, 2004Publication date: June 30, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Takeshi Naka, Osamu Tamura
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Patent number: 6853172Abstract: To provide a switching regulator with a small packaging area.Type: GrantFiled: October 28, 2003Date of Patent: February 8, 2005Assignees: Seiko Instruments Inc., Device Engineering Co., Ltd.Inventors: Kazuaki Sano, Takeshi Naka