Patents by Inventor Keita Yoshida

Keita Yoshida 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).

  • Patent number: 12145211
    Abstract: A rotary tool includes: a main body, and a rotary shaft for transmitting a rotary force; a stirring pin that is arranged on the main body so as to be rotatable by receiving the rotary force and to be movable relative to an axial direction of the rotary shaft, and that is inserted into a joint member to perform friction stirring on the joint member; a shoulder that is formed separately from the stirring pin, that is arranged on the main body so as not to receive the rotary force from the main body but to be movable separately from the stirring pin relative to the axial direction of the rotary shaft, and that presses the joint member while in contact with the joint member; and a first elastic member that biases the stirring pin toward a distal-end side relative to the axial direction of the rotary shaft.
    Type: Grant
    Filed: November 1, 2021
    Date of Patent: November 19, 2024
    Assignee: NIPPON LIGHT METAL COMPANY, LTD.
    Inventors: Nobushiro Seo, Ryo Yoshida, Shingo Koizumi, Keita Oikawa
  • Publication number: 20240346532
    Abstract: A service demand potential prediction device (10) includes: an acquisition unit (11) for acquiring the number of service provision results for own-company service and other-company service for each area; a calculation unit (12) for calculating a relative index of the own-company service to the other-company service for each area; a selection unit (13) for selecting a dominant area where the own-company service is dominant; a construction unit (14) for constructing a model (M) by performing machine learning using a characteristic amount of the dominant area as an explanatory variable and the number of service provision results of the own-company service as an objective variable; and a prediction unit (15) for predicting a service demand potential of the own-company service when the non-dominant area is assumed to be a dominant area by inputting the characteristic amount of the non-dominant area into the model (M).
    Type: Application
    Filed: July 20, 2022
    Publication date: October 17, 2024
    Applicant: NTT DOCOMO, INC.
    Inventors: Keita YOKOYAMA, Kenji SHINODA, Shigeki TANAKA, Norihiro KATSUMARU, Shohei YOSHIDA
  • Patent number: 12109647
    Abstract: A method for manufacturing a hollow container with use of a rotary tool including a tapered stirring pin, including: preparing a first metal member, a second metal member, and an auxiliary member; butting the first metal member and the second metal member to face with each other, the auxiliary member is interposed between the first metal member and the second metal member; and joining the first metal member with the second metal member via the auxiliary member. The first and second metal members, and the auxiliary member are made of aluminum or an aluminum alloy, and the first and second metal members have higher hardness than the auxiliary member. At least one of the first and second metal members has an inclined surface inclined outward, and the auxiliary member has an inclined surface, tapered from the external surface toward an internal surface, on at least one of the side surfaces.
    Type: Grant
    Filed: February 7, 2020
    Date of Patent: October 8, 2024
    Assignee: NIPPON LIGHT METAL COMPANY, LTD.
    Inventors: Nobushiro Seo, Keita Oikawa, Ryo Yoshida
  • Patent number: 12097783
    Abstract: A vehicle power supply system includes a first secondary battery, a second secondary battery whose output voltage is lower than that of the first secondary battery, a power conversion device configured to convert an input AC voltage into a DC voltage and output the DC voltage, a battery pack configured to receive the DC power output from the power conversion device and charge the first secondary battery, DC/DC converters configured to step down an input DC voltage to output the stepped-down DC voltage, and a power control unit configured to control the battery pack. The first secondary battery is connected to input ports of the DC/DC converters via the battery pack. An output port of the DC/DC converter is connected to a video media control unit, and the DC/DC converter is provided separately from the video media control unit. An output port of the DC/DC converter is connected to the second secondary battery.
    Type: Grant
    Filed: October 21, 2022
    Date of Patent: September 24, 2024
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Masato Ishibashi, Takeshi Matsukawa, Shinsuke Yoshitake, Daisuke Hamano, Shingo Hirose, Keita Yoshida
  • Patent number: 12077694
    Abstract: A surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc is provided. The surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc., comprises a surface layer, a resin substrate layer and a PSA layer, and has a multilayer structure with the resin substrate layer placed between the surface layer and the PSA layer, wherein the surface layer is a layer obtainable by curing a heat-curable composition comprising the following components: (a) a hydroxyl group-containing (meth)acrylic copolymer having a glass transition temperature of ?40° C. to 30° C.; (b) an allophanate polyisocyanate and/or a biuret polyisocyanate; and (c) a polysiloxane comprising a hydroxyl group-containing hydrocarbon group and/or polymer.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: September 3, 2024
    Assignees: ARAKAWA CHEMICAL INDUSTRIES, LTD., NITTO DENKO CORPORATION
    Inventors: Keita Kume, Yuki Hashimoto, Akihiro Yamazaki, Toru Higashimoto, Eiichi Imoto, Yoshio Nakagawa, Shota Tanaka, Kenichi Nishikawa, Chihiro Yoshida
  • Publication number: 20240287354
    Abstract: Provided is a pressure-sensitive adhesive sheet for processing a semiconductor element, which is capable of protecting a semiconductor element from electrostatic breakdown caused by peeling electrification and frictional electrification even under a high-humidity environment and/or under the application of a high voltage. The pressure-sensitive adhesive sheet includes a pressure-sensitive adhesive layer and a base material. A surface resistivity ?sBM of the base material and a surface resistivity ?sPA of the pressure-sensitive adhesive layer are each 1.0×1013?/? or less. In one embodiment, a surface resistivity ?s10VBM of the base material at a time of application of 10 V and a surface resistivity ?s10VPA of the pressure-sensitive adhesive layer at a time of application of 10 V, and a surface resistivity ?s1000VBM 1,000 V and a surface resistivity ?s1000VPA 1,000 V satisfy the following expression (1) and expression (2).
    Type: Application
    Filed: February 22, 2022
    Publication date: August 29, 2024
    Inventors: Jun AKIYAMA, Keita YOSHIDA
  • Publication number: 20230134343
    Abstract: A vehicle power supply system includes a first secondary battery, a second secondary battery whose output voltage is lower than that of the first secondary battery, a power conversion device configured to convert an input AC voltage into a DC voltage and output the DC voltage, a battery pack configured to receive the DC power output from the power conversion device and charge the first secondary battery, DC/DC converters configured to step down an input DC voltage to output the stepped-down DC voltage, and a power control unit configured to control the battery pack. The first secondary battery is connected to input ports of the DC/DC converters via the battery pack. An output port of the DC/DC converter is connected to a video media control unit, and the DC/DC converter is provided separately from the video media control unit. An output port of the DC/DC converter is connected to the second secondary battery.
    Type: Application
    Filed: October 21, 2022
    Publication date: May 4, 2023
    Applicant: Mazda Motor Corporation
    Inventors: Masato ISHIBASHI, Takeshi MATSUKAWA, Shinsuke YOSHITAKE, Daisuke HAMANO, Shingo HIROSE, Keita YOSHIDA
  • Publication number: 20230091546
    Abstract: A face feature point extraction unit to extract multiple face feature points from a face image; a model posture change unit to change the position and posture of a first three-dimensional model in such a way that the errors between the positions of the multiple face feature points and the positions of multiple model feature points on the face image become less than or equal to respective thresholds for error determination; a degree of match acquisition unit to acquire the degrees of match on the face image between the positions of the multiple model feature points on the first three-dimensional model having the changed position and posture, and the positions of the multiple face feature points; and a calibration unit to calibrate the first three-dimensional model by shifting the position of a model feature point on the basis of the corresponding one of the degrees of match are included.
    Type: Application
    Filed: February 17, 2020
    Publication date: March 23, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Ryosuke TORAMA, Takafumi MARUTANI, Keita YOSHIDA
  • Patent number: 11384112
    Abstract: Provided is an artificial nucleoside or artificial nucleotide capable of composing an artificial oligonucleotide having superior nuclease resistance. The artificial nucleoside or artificial nucleotide is a compound represented by formula (I) or a salt thereof (wherein, Bx represents a pyrimidine base or purine base, R1, R2, R3 and R4 represent hydrogen atoms, C1-6 alkyl groups or the like, Y represents NR5R6 (wherein, R5 and R6, independently of each other, represent a hydrogen atom, C1-6 alkyl group or the like, or R5 and R6, together with a nitrogen atom bound thereto, form a 3- to 11-membered nitrogen-containing non-aromatic heterocyclic group) or an optionally substituted C2-9 aromatic heterocyclic group, Z1 and Z2 represent hydrogen atoms, hydroxyl group-protecting groups, phosphorous-containing groups or the like, and n represents an integer of 1 to 3).
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: July 12, 2022
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, NISSAN CHEMICAL CORPORATION
    Inventors: Kohji Seio, Yoshiaki Masaki, Keishi Yamamoto, Keita Yoshida, Yusuke Iriyama, Hiroyuki Nakajima, Tatsuro Kanaki
  • Publication number: 20210188894
    Abstract: Provided is an artificial nucleoside or artificial nucleotide capable of composing an artificial oligonucleotide having superior nuclease resistance. The artificial nucleoside or artificial nucleotide is a compound represented by formula (I) or a salt thereof (wherein, Bx represents a pyrimidine base or purine base, R1, R2, R3 and R4 represent hydrogen atoms, C1-6 alkyl groups or the like, Y represents NR5R6 (wherein, R5 and R6, independently of each other, represent a hydrogen atom, C1-6 alkyl group or the like, or R5 and R6, together with a nitrogen atom bound thereto, form a 3- to 11-membered nitrogen-containing non-aromatic heterocyclic group) or an optionally substituted C2-9 aromatic heterocyclic group, Z1 and Z2 represent hydrogen atoms, hydroxyl group-protecting groups, phosphorous-containing groups or the like, and n represents an integer of 1 to 3).
    Type: Application
    Filed: February 17, 2017
    Publication date: June 24, 2021
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, NISSAN CHEMICAL CORPORATION
    Inventors: Kohji SEIO, Yoshiaki MASAKI, Keishi YAMAMOTO, Keita YOSHIDA, Yusuke IRIYAMA, Hiroyuki NAKAJIMA, Tatsuro KANAKI
  • Patent number: 10762384
    Abstract: A radiation image capturing system includes a radiation image capturing apparatus, an irradiation apparatus and an image processing apparatus. The image processing apparatus generates a first radiation image of a subject based on a signal value generated by the radiation image capturing apparatus with no grid attached irradiated by the irradiation apparatus; performs a low-pass filter process on a pixel value of the first radiation image using a scattering kernel, thereby generating a low frequency image; estimates a body thickness of the subject based on the signal value; estimates a scattered ray content rate based on the body thickness; calculates a scattered ray component in the first radiation image based on the low frequency image and the scattered ray content rate; and subtracts the scattered ray component from the first radiation image, thereby generating a second radiation image.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: September 1, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Ryohei Ito, Tatsuya Takagi, Keita Yoshida
  • Patent number: 10457322
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that achieves desired performance more simply with higher accuracy by setting a frequency characteristic according to a state of the control unit and automatically adjusting a control gain by the set value, and to provide an electric power steering apparatus equipped with the same.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: October 29, 2019
    Assignee: NSK LTD.
    Inventors: Keita Yoshida, Yousuke Imamura
  • Patent number: 10308278
    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that gradual-changes a steering angle control command value, an assist control command value and also a steering angle speed command value, suppresses an excessive accumulation of an integral value in a speed control by being provided a steering speed command value with a limiter, and does not give the driver an uncomfortable feeling.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: June 4, 2019
    Assignee: NSK LTD.
    Inventors: Takahiro Tsubaki, Tetsuya Kitazume, Keita Yoshida
  • Publication number: 20190084613
    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that gradual-changes a steering angle control command value, an assist control command value and also a steering angle speed command value, suppresses an excessive accumulation of an integral value in a speed control by being provided a steering speed command value with a limiter, and does not give the driver an uncomfortable feeling.
    Type: Application
    Filed: March 17, 2017
    Publication date: March 21, 2019
    Applicant: NSK LTD.
    Inventors: Takahiro TSUBAKI, Tetsuya KITAZUME, Keita YOSHIDA
  • Patent number: 10099721
    Abstract: An electric power steering apparatus that reduces an uncomfortable feeling due to a noise at a steering holding and a low-speed steering time, and can smoothly steers so as to prevent a phase-lag at a high-speed steering time. The apparatus has a torque control section to calculate a current command value based on at least a steering torque, and assist-controls a steering system by driving a motor using a current control system based on the current command value. A motor angular velocity calculating section calculates a motor angular velocity from a motor rotational angle; a motor angular acceleration calculating section calculates a motor angular acceleration from the motor angular velocity; and a stability compensating section calculates a steering torque for compensation and a current command value for compensation based on the motor angular velocity and the motor angular acceleration. The steering torque compensates the steering torque, and the current command value compensates the current command value.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: October 16, 2018
    Assignee: NSK LTD.
    Inventors: Keita Yoshida, Yousuke Imamura, Masahiro Maeda
  • Publication number: 20180273090
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that achieves desired performance more simply with higher accuracy by setting a frequency characteristic according to a state of the control unit and automatically adjusting a control gain by the set value, and to provide an electric power steering apparatus equipped with the same.
    Type: Application
    Filed: April 5, 2016
    Publication date: September 27, 2018
    Applicant: NSK Ltd.
    Inventors: Keita YOSHIDA, Yousuke IMAMURA
  • Publication number: 20180170422
    Abstract: An electric power steering apparatus that reduces an uncomfortable feeling due to a noise at a steering holding and a low-speed steering time, and can smoothly steers so as to prevent a phase-lag at a high-speed steering time. The apparatus has a torque control section to calculate a current command value based on at least a steering torque, and assist-controls a steering system by driving a motor using a current control system based on the current command value. A motor angular velocity calculating section calculates a motor angular velocity from a motor rotational angle; a motor angular acceleration calculating section calculates a motor angular acceleration from the motor angular velocity; and a stability compensating section calculates a steering torque for compensation and a current command value for compensation based on the motor angular velocity and the motor angular acceleration. The steering torque compensates the steering torque, and the current command value compensates the current command value.
    Type: Application
    Filed: November 5, 2015
    Publication date: June 21, 2018
    Applicant: NSK LTD.
    Inventors: Keita YOSHIDA, Yousuke IMAMURA, Masahiro MAEDA
  • Patent number: 9637166
    Abstract: Although the steering angle control of a steering wheel is performed using automatic steering control, when the steering torque is applied by the steering wheel operation of the driver, the target steering angle is corrected to become the same direction as a direction that the steering torque is applied, and the steering angle control is performed to coincide with that target steering angle. Thereby, in the case of adding together outputs of the steering angle control with respect to the corrected target steering angle and the assist control by the steering torque with a certain ratio, it is possible to make the output direction of the automatic steering control coincide with the output direction of the manual steering control, and the control outputs become hard to interfere with each other. As a result, the uncomfortable feeling given to the driver that occurs in switching the steering mode is reduced.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: May 2, 2017
    Assignee: NSK LTD.
    Inventors: Takahiro Tsubaki, Tetsuya Kitazume, Keita Yoshida
  • Publication number: 20160302752
    Abstract: A radiation image capturing system includes a radiation image capturing apparatus, an irradiation apparatus and an image processing apparatus. The image processing apparatus generates a first radiation image of a subject based on a signal value generated by the radiation image capturing apparatus with no grid attached irradiated by the irradiation apparatus; performs a low-pass filter process on a pixel value of the first radiation image using a scattering kernel, thereby generating a low frequency image; estimates a body thickness of the subject based on the signal value; estimates a scattered ray content rate based on the body thickness; calculates a scattered ray component in the first radiation image based on the low frequency image and the scattered ray content rate; and subtracts the scattered ray component from the first radiation image, thereby generating a second radiation image.
    Type: Application
    Filed: April 15, 2016
    Publication date: October 20, 2016
    Inventors: Ryohei ITO, Tatsuya TAKAGI, Keita YOSHIDA
  • Patent number: 9446789
    Abstract: An electric power steering apparatus that realizes vibration suppression of response characteristics and has a control performance having resistance properties against disturbances such as a road surface change by using a velocity I-P control (a proportional-lead type PI control) in a vehicle having functions of an automatic steering control and a manual steering control.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: September 20, 2016
    Assignee: NSK LTD.
    Inventors: Takahiro Tsubaki, Tetsuya Kitazume, Keita Yoshida