Patents by Inventor Yuuki Takeda

Yuuki Takeda 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: 10816164
    Abstract: A lamp reflector (10a) includes a mirror surface (11) and a laminate (12a). The mirror surface (11) is a surface for reflecting light from a light source (30) to guide the light in a predetermined direction. The laminate (12a) covers at least a part of the mirror surface (11) to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate (12a) allows the light from the light source (30) to transmit therethrough toward the mirror surface (11).
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: October 27, 2020
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroichi Ukei, Takehiro Ui, Ryosuke Aoki, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
  • Patent number: 10814470
    Abstract: A rectifier circuit for rectifying an AC voltage supplied from a commercial power supply into a DC voltage, a smoothing capacitor for smoothing the output of the rectifier circuit, and an electrically powered tool for supplying the smoothed pulsating DC voltage to a motor by an inverter circuit, wherein when the motor is driven while no load is being applied to a tip tool, the smoothed DC voltage repeatedly generates a maximal value and a minimum value so as to synchronize with the fluctuation in the AC voltage. During no-load rotation, control is performed so that driving is performed at a value that is less than a threshold value D1 for the duty ratio at which the generation of a gear sound starts in any of the speed dial setting values 1-6. It is thereby possible to suppress a gear sound generated by a power transmission mechanism during no-load rotation.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: October 27, 2020
    Assignee: Koki Holdings Co., Ltd.
    Inventors: Yuuki Takeda, Kyouichi Nakayama
  • Publication number: 20200214181
    Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.
    Type: Application
    Filed: March 27, 2018
    Publication date: July 2, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuto Yamagata, Hironobu Machinaga, Yuuki Takeda, Hiroichi Ukei, Takehiro Ui
  • Publication number: 20200189064
    Abstract: Provided is an electric tool in which the risk of short-circuiting between conductive members of multiple installed switching elements has been reduced by providing partitioning plates between the switching elements. An electric tool, which has a motor, an inverter circuit with multiple switching elements for performing switching operations and controlling the driving of the motor, a control unit for controlling switching element on-off operations, and a circuit board on which the switching elements are loaded, is configured so that the circuit board is housed inside a container-shaped case (40) and the circuit board is secured with a partitioning member (50) that is interposed between the multiple switching elements and has partitioning plates (51, 52a, 52b) obtained from an insulating material.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 18, 2020
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Yuuki TAKEDA, Hironori SAKAI
  • Patent number: 10666168
    Abstract: Provided is an easy-to-use electric tool with which braking force can be changed according to work conditions. When an operation switch 5 is turned off, a control unit 50 detects a rotation rate R1 of an electric motor 6. The control unit 50 stands by for a prescribed period, detects a rotation rate R2 of the electric motor 6, and calculates the difference between the rotation rates R1, R2 (R=R1?R2). Since the rotation rate difference R corresponds to the rate of change in rotation rate with time during deceleration of the electric motor 6 and is smaller the larger the moment of inertia of the attached rotary tool, the control unit 50 can determine the moment of inertia of the rotary tool on the basis of the rotation rate difference R. The control unit 50 sets the braking force according to the moment of inertia and performs braking.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: May 26, 2020
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventor: Yuuki Takeda
  • Publication number: 20200161771
    Abstract: An electromagnetic wave absorber (1a) includes a first layer (10) and an electrically conductive layer (20). The first layer (10) is a dielectric layer or a magnetic layer. The electrically conductive layer (20) is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer (10) and a thickness of the first layer (10) is 0.1 to 1000 MPa · mm. The first layer (10) has a relative permittivity of 1 to 10.
    Type: Application
    Filed: January 23, 2018
    Publication date: May 21, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Hiroichi Ukei, Takehiro Ui, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
  • Publication number: 20200133276
    Abstract: An automatic program-correction device includes: a clearance detecting unit that detects an amount of clearance between a robot and a peripheral device in an operation program; a near-miss detecting unit that detects a near-miss section; a closest-point detecting unit that detects a pair of closest points, in the near-miss section; and a program updating unit that generates a new operation program having an intermediate teaching point to which the closest points have been moved, along a straight line passing through the detected pair of closest points, until the amount of clearance becomes greater than a minimum amount of clearance and equal to or less than the threshold. While gradually reducing, from the threshold, the amount of clearance at the intermediate teaching point, the program updating unit obtains an intermediate teaching point that provides a maximum amount of clearance at which a new near-miss section is not detected.
    Type: Application
    Filed: October 8, 2019
    Publication date: April 30, 2020
    Inventors: Yuuki KIMOTO, Yoshiharu NAGATSUKA, Toshiya TAKEDA
  • Publication number: 20200128705
    Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrical conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrical conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) includes indium oxide as a main component, has a polycrystalline structure, and has a sheet resistance of 260 to 500?/? and a specific resistance of 5×10?4 ?·cm or more.
    Type: Application
    Filed: March 27, 2018
    Publication date: April 23, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuto Yamagata, Hironobu Machinaga, Yuuki Takeda, Eri Ueda, Hiroichi Ukei, Takehiro Ui
  • Publication number: 20200116332
    Abstract: A lamp reflector (10a) includes a mirror surface (11) and a laminate (12a). The mirror surface (11) is a surface for reflecting light from a light source (30) to guide the light in a predetermined direction. The laminate (12a) covers at least a part of the mirror surface (11) to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate (12a) allows the light from the light source (30) to transmit therethrough toward the mirror surface (11).
    Type: Application
    Filed: June 12, 2018
    Publication date: April 16, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Hiroichi Ukei, Takehiro Ui, Ryosuke Aoki, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
  • Patent number: 10596679
    Abstract: Provided is an electric tool in which the risk of short-circuiting between conductive members of multiple installed switching elements has been reduced by providing partitioning plates between the switching elements. An electric tool, which has a motor, an inverter circuit with multiple switching elements for performing switching operations and controlling the driving of the motor, a control unit for controlling switching element on-off operations, and a circuit board on which the switching elements are loaded, is configured so that the circuit board is housed inside a container-shaped case (40) and the circuit board is secured with a partitioning member (50) that is interposed between the multiple switching elements and has partitioning plates (51, 52a, 52b) obtained from an insulating material.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: March 24, 2020
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Yuuki Takeda, Hironori Sakai
  • Patent number: 10512200
    Abstract: An electromagnetic wave absorber (1a) includes: a first layer (10a) being a dielectric layer or a magnetic layer; and a conductive layer (20a) provided on at least one surface of the first layer (10a). The conductive layer (20a) has a sheet resistance of 100?/? or less after the electromagnetic wave absorber (1a) is exposed to an environment having a temperature of 85° C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber (1a) has a flexural rigidity of 7000 MPa·mm4 or less.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: December 17, 2019
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hironobu Machinaga, Hiroichi Ukei, Takehiro Ui, Kazuto Yamagata, Yuuki Takeda
  • Publication number: 20190380232
    Abstract: An electromagnetic wave absorber (1a) includes: a first layer (10a) being a dielectric layer or a magnetic layer; and a conductive layer (20a) provided on at least one surface of the first layer (10a). The conductive layer (20a) has a sheet resistance of 100?/? or less after the electromagnetic wave absorber (1a) is exposed to an environment having a temperature of 85° C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber (1a) has a flexural rigidity of 7000 MPa·mm4 or less.
    Type: Application
    Filed: December 11, 2017
    Publication date: December 12, 2019
    Applicant: NITTO DENKO CORPORATION
    Inventors: Hironobu Machinaga, Hiroichi Ukei, Takehiro Ui, Kazuto Yamagata, Yuuki Takeda
  • Patent number: 10302062
    Abstract: An ignition control apparatus of the present embodiment controls operation of an ignition plug provided so as to ignite an air-fuel mixed gas.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: May 28, 2019
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Ishitani, Akimitsu Sugiura, Makoto Toriyama, Satoru Nakayama, Yuuki Kondou, Hisaharu Morita, Naoto Hayashi, Yuuto Tamei, Takashi Oono, Shunichi Takeda
  • Publication number: 20190091849
    Abstract: The electric tool including a motor having a stator and a rotor, a rotation shaft integrally rotating with the rotor, a casing accommodating the motor, a ventilating window disposed in the casing, a cooling fan sucking an air through the ventilating window to cool off the motor, a magnetic body disposed to the rotation shaft, a magnetic detection unit detecting a rotational position of the magnetic body, and a circuit substrate on which the magnetic detection unit is mounted. The circuit substrate and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan.
    Type: Application
    Filed: November 29, 2018
    Publication date: March 28, 2019
    Applicant: Koki Holdings Co., Ltd.
    Inventor: Yuuki TAKEDA
  • Publication number: 20190039227
    Abstract: A rectifier circuit for rectifying an AC voltage supplied from a commercial power supply into a DC voltage, a smoothing capacitor for smoothing the output of the rectifier circuit, and an electrically powered tool for supplying the smoothed pulsating DC voltage to a motor by an inverter circuit, wherein when the motor is driven while no load is being applied to a tip tool, the smoothed DC voltage repeatedly generates a maximal value and a minimum value so as to synchronize with the fluctuation in the AC voltage. During no-load rotation, control is performed so that driving is performed at a value that is less than a threshold value D1 for the duty ratio at which the generation of a gear sound starts in any of the speed dial setting values 1-6. It is thereby possible to suppress a gear sound generated by a power transmission mechanism during no-load rotation.
    Type: Application
    Filed: February 17, 2017
    Publication date: February 7, 2019
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Yuuki TAKEDA, Kyouichi NAKAYAMA
  • Patent number: 10173311
    Abstract: An electric tool is provided. The electric tool prevents anomalies in motor rotation due to dust and moisture sucked in together with a cooling wind, and is configured such that rotational position detection operations and switch operations are not affected. In the electric tool which drives a brushless DC motor using a controller, a magnetic body for rotational position detection is provided on a rotation shaft which can rotate integrally with a rotor, Hall ICs are provided to detect the rotational position of the magnetic body and output a position signal to the controller, and the magnetic body and the Hall ICs mounted on a substrate are arranged in a region isolated from the wind path of the cooling wind generated by rotation of a cooling fan. The Hall ICs are accommodated in a housing filled with resin.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: January 8, 2019
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventor: Yuuki Takeda
  • Publication number: 20180193804
    Abstract: A resin film has through holes formed to extend through the thickness of the resin film. The through holes are pillar-shaped. An average density of the through holes is 1×106 to 1×1012 holes/cm2. An average diameter of the through holes is 1 to 310 nm. A degree of variability of the diameter of the through holes is 30% or less, the degree of variability of the diameter of the through holes obtained by dividing a standard deviation of the diameter of the through holes by the average diameter of the through holes and multiplying the resulting value by 100.
    Type: Application
    Filed: June 1, 2016
    Publication date: July 12, 2018
    Applicant: NITTO DENKO CORPORATION
    Inventors: Hajime YAMAMOTO, Tsukasa MIYAZAKI, Yuuki TAKEDA, Satoru FURUYAMA
  • Publication number: 20180111259
    Abstract: A power tool is provided such that noise can be reduced at a wide range of rotation speeds. A speed setting dial to be operated by a worker is disposed on a rear end part of a housing of a grinder. A control part controls driving of a motor by setting the rotation speed of the motor in response to the value of a speed setting signal which indicates a value (voltage) corresponding to an amount of rotation of the speed setting dial by the worker. Although the control part basically causes the rotation speed of the motor to change continuously in response to the rotation amount of the speed setting dial, the control part sets the rotation speed of the motor while avoiding a predetermined rotation speed region in which the noise level is increased due to mechanical and acoustic resonances.
    Type: Application
    Filed: March 25, 2016
    Publication date: April 26, 2018
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yuuki TAKEDA, Takuya YOSHINARI
  • Publication number: 20180099372
    Abstract: Provided is an electric tool in which the risk of short-circuiting between conductive members of multiple installed switching elements has been reduced by providing partitioning plates between the switching elements. An electric tool, which has a motor, an inverter circuit with multiple switching elements for performing switching operations and controlling the driving of the motor, a control unit for controlling switching element on-off operations, and a circuit board on which the switching elements are loaded, is configured so that the circuit board is housed inside a container-shaped case (40) and the circuit board is secured with a partitioning member (50) that is interposed between the multiple switching elements and has partitioning plates (51, 52a, 52b) obtained from an insulating material.
    Type: Application
    Filed: March 25, 2016
    Publication date: April 12, 2018
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yuuki TAKEDA, Hironori SAKAI
  • Publication number: 20170264219
    Abstract: Provided is an easy-to-use electric tool with which braking force can be changed according to work conditions. When an operation switch 5 is turned off, a control unit 50 detects a rotation rate R1 of an electric motor 6. The control unit 50 stands by for a prescribed period, detects a rotation rate R2 of the electric motor 6, and calculates the difference between the rotation rates R1, R2 (R=R1?R2). Since the rotation rate difference R corresponds to the rate of change in rotation rate with time during deceleration of the electric motor 6 and is smaller the larger the moment of inertia of the attached rotary tool, the control unit 50 can determine the moment of inertia of the rotary tool on the basis of the rotation rate difference R. The control unit 50 sets the braking force according to the moment of inertia and performs braking.
    Type: Application
    Filed: October 30, 2015
    Publication date: September 14, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventor: Yuuki TAKEDA