Patents by Inventor Kei Yamazaki
Kei Yamazaki 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: 20240143100Abstract: A display device with excellent visibility can be provided. The display device includes a display region displayed by a light-emitting element. In the display region, a point touched by a user is a first point, a point which has been touched by the user prior to the first point is a second point, a vector that starts at the first point and ends at the second point is a first vector, a vector obtained by multiplying the first vector by k (k is a real number) is a second vector, and a point that is the second vector away from the first point is a third point, the display region includes a first region and a second region obtained by excluding the first region from the display region, The first region includes a first circle and a second circle, the center of the first circle is the first point, and the center of the second circle is the third point. The luminance in the first region is higher than the luminance in the second region.Type: ApplicationFiled: January 12, 2024Publication date: May 2, 2024Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Takayuki Ikeda, Yuki Okamoto, Kei Takahashi, Shunpei Yamazaki
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Patent number: 11960185Abstract: Display data of pixels is updated at different timings. A scan line is connected to a first pixel and a second pixel, a first wiring is connected to the first pixel, and a second wiring is connected to the second pixel. In a first period, a signal for selecting the first pixel and the second pixel is supplied to the scan line. Setting data for setting a state where the display data of the first pixel is updated is supplied to the first wiring, and setting data for setting a state where the display data of the second pixel is updated is supplied to the second wiring. In a second period, a signal for selecting the first pixel and the second pixel is supplied to the scan line. Setting data for setting a state where the display data of the first pixel is not updated is supplied to the first wiring, and the setting data for setting the state where the display data of the second pixel is updated is supplied to the second wiring.Type: GrantFiled: March 19, 2019Date of Patent: April 16, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Kouhei Toyotaka, Satoshi Yoshimoto, Kazunori Watanabe, Susumu Kawashima, Kei Takahashi
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Publication number: 20240116759Abstract: Provided is a method for producing a positive electrode active material for an alkali ion secondary battery, the positive electrode active material containing a large amount of a transition metal and enabling operation of the battery. In the method for producing a positive electrode active material for an alkali ion secondary battery, in which the positive electrode active material contains 34 mol % or more of CrO+FeO+MnO+CoO+NiO, the method includes: a step of preparing a positive electrode active material precursor containing crystals; and a step of irradiating the positive electrode active material precursor with light to melt the crystals and amorphize at least a portion of the positive electrode active material precursor.Type: ApplicationFiled: February 3, 2022Publication date: April 11, 2024Inventors: Tsuyoshi HONMA, Masafumi HIRATSUKA, Hideo YAMAUCHI, Ayumu TANAKA, Kei TSUNODA, Yoshinori YAMAZAKI
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Patent number: 11935750Abstract: A method for producing a semiconductor device includes forming, on a substrate, a film to be processed. The method further includes forming, on the film to be processed, a first film containing a metallic element and a second film containing at least one of carbon or boron. The method further includes forming an insulating film on the first and second films. The method further includes processing the film to be processed using the first film, the second film, and the insulating film, as a mask.Type: GrantFiled: February 25, 2021Date of Patent: March 19, 2024Assignee: KIOXIA CORPORATIONInventors: Kei Watanabe, Toshiyuki Sasaki, Soichi Yamazaki, Shunsuke Ochiai, Yuya Matsubara
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Patent number: 11511365Abstract: A welding system includes a welding torch that welds a workpiece by using a wire, a suction device that sucks shielding gas, and a sucked shielding gas supply path for allowing the sucked shielding gas to flow, wherein the welding torch includes a contact chip that guides the wire, a shielding gas supply nozzle that supplies the shielding gas to a weld zone, and a suction nozzle that surrounds a periphery of the wire protruding from the contact chip, and is opened toward a tip of the wire to suck the shielding gas.Type: GrantFiled: January 4, 2016Date of Patent: November 29, 2022Assignee: Kobe Steel, Ltd.Inventors: Naoki Kawabe, Tokuji Maruyama, Minoru Miyata, Kei Yamazaki, Reiichi Suzuki
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Patent number: 11318567Abstract: In this flux-cored wire, the contents of F, Li, acid-soluble Al, Mg, S, CO2, Ba, Ca, Sr, REM, P, C which is not derived from a carbonate, Mn, Ni, and Cu are set to fall within prescribed ranges with respect to the total mass of the wire, and the blending ratio among these components is set to fall within a particular range.Type: GrantFiled: April 25, 2017Date of Patent: May 3, 2022Assignee: Kobe Steel, Ltd.Inventors: Naoki Kawabe, Eri Yamamoto, Kei Yamazaki, Reiichi Suzuki
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Patent number: 11165377Abstract: A control device for a stepping motor capable of hold control that can smoothly reduce an excitation current at a rotation stopping time of the stepping motor is provided. A control device (10) for a stepping motor (20) causes an excitation current to flow in a plurality of coils to rotate a rotor. The control device (10) includes a driving circuit (40) that applies a driving voltage to the coils, and a control circuit (30) that controls the driving voltage. The control circuit (30) performs hold control to move the rotor to a predetermined stop position by changing a magnitude of the excitation current flowing in the coils so that the magnitude of the excitation current becomes close to a target current value that gradually decreases, in a hold time period at a rotation stopping time of the stepping motor (20).Type: GrantFiled: May 23, 2019Date of Patent: November 2, 2021Assignee: MINEBEA MITSUMI INC.Inventors: Ayaka Shimada, Kazuo Takada, Kei Yamazaki
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Patent number: 11139763Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.Type: GrantFiled: July 27, 2020Date of Patent: October 5, 2021Assignee: MINEBEA MITSUMI INC.Inventors: Haruka Miyaji, Kei Yamazaki, Takayuki Matsui, Kazuo Takada, Shigeki Miyaji, Ayaka Shimada
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Publication number: 20210249977Abstract: A control device for a stepping motor capable of hold control that can smoothly reduce an excitation current at a rotation stopping time of the stepping motor is provided. A control device (10) for a stepping motor (20) causes an excitation current to flow in a plurality of coils to rotate a rotor. The control device (10) includes a driving circuit (40) that applies a driving voltage to the coils, and a control circuit (30) that controls the driving voltage. The control circuit (30) performs hold control to move the rotor to a predetermined stop position by changing a magnitude of the excitation current flowing in the coils so that the magnitude of the excitation current becomes close to a target current value that gradually decreases, in a hold time period at a rotation stopping time of the stepping motor (20).Type: ApplicationFiled: May 23, 2019Publication date: August 12, 2021Inventors: Ayaka SHIMADA, Kazuo TAKADA, Kei YAMAZAKI
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Publication number: 20210215704Abstract: An object of the present invention is to provide fluorescently labeled silica-coated gold nanorods that are safe for administration to living bodies, stable to temperature rise and external environment, and easy to manufacture. The present invention is a labeled silica-coated gold nanorod, including a gold nanorod, a silica layer covering the gold nanorod, spacers bonded to the silica layer, and labeled materials, in which the labeled material is chemically bonded to the spacer. The present invention also provides a method for producing a labeled silica-coated gold nanorod, including an introduction step and a binding step, in which in the introduction step, spacers are introduced on a silica layer of a silica-coated gold nanorod and in the binding step, a labeled material is chemically bound to the spacer.Type: ApplicationFiled: January 8, 2021Publication date: July 15, 2021Applicant: UNIVERSITY OF YAMANASHIInventors: Hideyuki Shinmori, Kei Yamazaki, Akira Shinohara
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Patent number: 11005400Abstract: In order to suppress high-frequency noise in micro-step driving of a stepping motor, a motor control device (100) includes an H bridge circuit (20) and control means for driving a switching element of the H bridge circuit (20) with a PWM signal and for setting a charge mode, a fast attenuation mode, or a slow attenuation mode for a motor coil. In a range from an electrical angle where the reference current value starts descending to an electrical angle of +52°, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and then to the slow attenuation mode. In a range exceeding +52° and to +90 degrees where the reference current value starts ascending, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and, if the motor current exceeds the reference current value, then the control means switches it to the fast attenuation mode and further to the slow attenuation mode.Type: GrantFiled: May 30, 2018Date of Patent: May 11, 2021Assignee: MINEBEA MITSUMI INC.Inventors: Kei Yamazaki, Tetsuya Seki, Shigeki Miyaji
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Publication number: 20210044229Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.Type: ApplicationFiled: July 27, 2020Publication date: February 11, 2021Inventors: Haruka MIYAJI, Kei YAMAZAKI, Takayuki MATSUI, Kazuo TAKADA, Shigeki MIYAJI, Ayaka SHIMADA
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Patent number: 10702955Abstract: The purpose of the present invention is to provide a flux cored wire which has good high-temperature cracking resistance, and which enables the achievement of a welded part exhibiting excellent coating adhesion. The present invention relates to a metal flux cored wire for gas-shielded are welding, which contains, relative to the total mass of the wire, 0.02-0.30% by mass of C, 0.3-1.5% by mass of Si, 0.3-2.5% by mass of Mn, and oxide of at least one element selected from the group consisting of Si, Cr and Ni in an amount of 0.01-0.30% by mass in total, 0.020% by mass or less of S, and 0.3% by mass or less of Al, Ca, Mg, K and Na in total in the form of metals or alloys, with the balance made up of Fe and unavoidable impurities.Type: GrantFiled: April 22, 2016Date of Patent: July 7, 2020Assignee: Kobe Steel, Ltd.Inventors: Minoru Miyata, Reiichi Suzuki, Kei Yamazaki
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Publication number: 20200083827Abstract: In order to suppress high-frequency noise in micro-step driving of a stepping motor, a motor control device (100) includes an H bridge circuit (20) and control means for driving a switching element of the H bridge circuit (20) with a PWM signal and for setting a charge mode, a fast attenuation mode, or a slow attenuation mode for a motor coil. In a range from an electrical angle where the reference current value starts descending to an electrical angle of +52°, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and then to the slow attenuation mode. In a range exceeding +52° and to +90 degrees where the reference current value starts ascending, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and, if the motor current exceeds the reference current value, then the control means switches it to the fast attenuation mode and further to the slow attenuation mode.Type: ApplicationFiled: May 30, 2018Publication date: March 12, 2020Inventors: Kei YAMAZAKI, Tetsuya SEKI, Shigeki MIYAJI
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Patent number: 10498270Abstract: A control device for a stepping motor gradually increases an absolute value of the excitation current in phase A from when the start until the end of the hold period such that the amount of change in the excitation current per unit time is smaller than or equal to a first predetermined value. From the start of the hold period until a predetermined time elapses, an absolute value of the excitation current in phase B gradually increases such that the amount of change in the excitation current per unit time is smaller than or equal to the first predetermined value. By the end of the hold period after the predetermined time has elapsed, the excitation current in phase B reaches zero. When the hold period ends, one-phase excitation operation starts and the excitation current flows in phase A first with the same polarity as at the end of the hold period.Type: GrantFiled: April 5, 2018Date of Patent: December 3, 2019Assignee: MINEBEA MITSUMI INC.Inventors: Koichi Takeda, Kazuo Takada, Shigeki Miyaji, Kei Yamazaki
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Patent number: 10469010Abstract: A motor drive controller capable of taking measures against vibration or noise of a motor is provided. The motor drive controller configured to drive a stepping motor in microstepping mode controls the number of PWM (Pulse Width Modulation) cycles contained in one microstep cycle. More specifically, the number of PWM cycles contained in one microstep cycle is controlled so that a vibration contained in a current waveform determined by the number of PWM cycles contained in one microstep cycle does not approximate the natural frequency of the stepping motor.Type: GrantFiled: March 6, 2018Date of Patent: November 5, 2019Assignee: MINEBEA MITSUMI INC.Inventors: Tetsuya Seki, Kei Yamazaki
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Patent number: 10408868Abstract: In accordance with one aspect of the present disclosure, a motor drive control device is a motor drive control device performing PWM (Pulse Width Modulation) control of a motor, wherein harmonics of a fundamental frequency for PWM control of the motor are included in noise occurring from the motor; the fundamental frequency for PWM control is larger than a frequency corresponding to a bandwidth of a predetermined radio frequency band a communication apparatus uses; and frequencies of continuous harmonic components of the fundamental frequency for PWM control appear before and after the predetermined radio frequency band.Type: GrantFiled: March 6, 2018Date of Patent: September 10, 2019Assignee: MINEBEA MITSUMI INC.Inventors: Shigeki Miyaji, Kazuo Takada, Kei Yamazaki
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Publication number: 20190255945Abstract: An on-vehicle device includes a main body, a display, and a connector. The main body is housed in a storage box of a console panel in a vehicle. The display includes a screen larger in size than a front face of the main body. The connector connects the main body to the display. The connector includes a vertical slide mechanism configured to cause the display to slide heightwise of the screen of the display.Type: ApplicationFiled: January 31, 2017Publication date: August 22, 2019Inventors: KEI YAMAZAKI, HIROSHI MAGOORI, YUKINORI HOKIMOTO
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Patent number: 10363625Abstract: Disclosed is a method for performing gas-shielded pulsed arc welding at high current densities with a flux-cored wire as an electrode wire. The pulsed arc welding is carried out by passing a pulsed current so that a pulse peak current density during a pulse peak time Tp is 400 to 950 A/mm2, a pulse base current density during a pulse base time Tb is 200 A/mm2 or more and differs from the pulse peak current density by 200 to 400 A/mm2, and an average current density is 350 to 750 A/mm2. The method allows significant spatter reduction while attaining a high deposition rate.Type: GrantFiled: April 13, 2011Date of Patent: July 30, 2019Assignee: Kobe Steel, Ltd.Inventors: Kei Yamazaki, Reiichi Suzuki, Yimin Yuan
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Publication number: 20190126411Abstract: In this flux-cored wire, the contents of F, Li, acid-soluble Al, Mg, S, CO2, Ba, Ca, Sr, REM, P, C which is not derived from a carbonate, Mn, Ni, and Cu are set to fall within prescribed ranges with respect to the total mass of the wire, and the blending ratio among these components is set to fall within a particular range.Type: ApplicationFiled: April 25, 2017Publication date: May 2, 2019Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Naoki KAWABE, Eri YAMAMOTO, Kei YAMAZAKI, Reiichi SUZUKI