Patents by Inventor Takafumi Murakami

Takafumi Murakami 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).

  • Publication number: 20210037448
    Abstract: [Problem] In a terminal station and a base station, in which a plurality of wireless communication units supporting different communication performances are mounted, it is possible to select and switch wireless communication unit which responds to a congested condition of wireless communication and a wireless communication quality, and further improves a wireless resource usage efficiency.
    Type: Application
    Filed: February 12, 2019
    Publication date: February 4, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toshiro NAKAHIRA, Tomoki MURAKAMI, Koichi ISHIHARA, Mamoru AKIMOTO, Takafumi HAYASHI
  • Publication number: 20200307312
    Abstract: A drive shaft is configured by joining solid stub shafts formed of a medium carbon steel to both ends of a hollow tubular body formed of a medium carbon steel. When expressed as grain size number, the grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together ranges from #5 to #9, and the grain size of the solid stub shafts at the joint parts ranges from #10 to #12.
    Type: Application
    Filed: March 24, 2020
    Publication date: October 1, 2020
    Inventors: Mitsuru Kamikawa, Naoto Shibata, Ko Sugai, Masafumi Yamamoto, Takafumi Murakami, Kazuya Kumei, Yutaka Takeuchi, Masaki Kawamura
  • Patent number: 10642171
    Abstract: An imprint apparatus includes a substrate holding unit. A generation unit generates heating distribution data indicating distribution of a heat value to be applied to a region to be processed. A heating unit gives heat to the region to be processed to deform the region. An obtaining unit which obtains first information defined based on a difference of shapes of the region and a pattern portion of the mold, and second information about a deformation amount of the region. The second information is obtained, by trying deformation of the region to be processed by the heating unit while the substrate holding unit attracts the substrate. A patterning unit forms the pattern while the heating unit is deforming the region to be processed based on the heating distribution data generated, in which the generation unit generates the heating distribution data based on the obtained first and second information.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: May 5, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takahiro Matsumoto, Kenichi Kobayashi, Takafumi Miyaharu, Yosuke Murakami, Tatsuya Hayashi
  • Patent number: 10364710
    Abstract: An engine valve and a method of producing the engine valve are provided. The engine valve includes a shaft part and an umbrella part formed at one end of the shaft part. The engine valve opens and closes an intake port or an exhaust port of a combustion chamber of an internal combustion engine. Further, at least a portion of the engine valve that extends from the umbrella part to a position on the shaft part in a longitudinal direction thereof includes a valve body made of steel or nickel alloy, and a core member made of copper or copper alloy and provided inside the valve body.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: July 30, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Takafumi Murakami
  • Patent number: 10126470
    Abstract: An optical absorber includes a first light-absorbing body which receives light incident from an entrance aperture and partially absorbs and reflects the incident light, and a second light-absorbing body which partially absorbs the incident light reflected by the first light-absorbing body and partially reflects the incident light toward the first light-absorbing body. The reflectance and light resistance of the first light-absorbing body are set higher than the reflectance and light resistance, respectively, of the second light-absorbing body.
    Type: Grant
    Filed: March 1, 2016
    Date of Patent: November 13, 2018
    Assignee: FANUC CORPORATION
    Inventors: Takafumi Murakami, Michinori Maeda
  • Publication number: 20180283261
    Abstract: An expansion tank includes a plurality of partition walls separating a storage chamber of the tank main body into a plurality of compartment chambers, each partition wall provided with a lower communicating portion and an upper communicating portion formed in a lower part and an upper part thereof, respectively, to communicate the adjoining compartment chambers to each other, wherein the compartment chambers include an inlet chamber having an inlet, an outlet chamber having an outlet, and intermediate chambers, and wherein one of the compartment chambers other than the outlet chamber is provided with a communication port, and a lower edge of the upper communicating portion of the partition wall defining the compartment chamber provided with the communication port is lower than a lower edge of the upper communicating portion of another one of the partition walls.
    Type: Application
    Filed: September 26, 2016
    Publication date: October 4, 2018
    Inventors: Haruo MORISHITA, Shinji SHIMOYAMA, Yoshihiro HATTORI, Takafumi MURAKAMI
  • Publication number: 20170276032
    Abstract: An engine valve and a method of producing the engine valve are provided. The engine valve includes a shaft part and an umbrella part formed at one end of the shaft part. The engine valve opens and closes an intake port or an exhaust port of a combustion chamber of an internal combustion engine. Further, at least a portion of the engine valve that extends from the umbrella part to a position on the shaft part in a longitudinal direction thereof includes a valve body made of steel or nickel alloy, and a core member made of copper or copper alloy and provided inside the valve body.
    Type: Application
    Filed: March 21, 2017
    Publication date: September 28, 2017
    Inventor: Takafumi Murakami
  • Publication number: 20160259096
    Abstract: An optical absorber includes a first light-absorbing body which receives light incident from an entrance aperture and partially absorbs and reflects the incident light, and a second light-absorbing body which partially absorbs the incident light reflected by the first light-absorbing body and partially reflects the incident light toward the first light-absorbing body. The reflectance and light resistance of the first light-absorbing body are set higher than the reflectance and light resistance, respectively, of the second light-absorbing body.
    Type: Application
    Filed: March 1, 2016
    Publication date: September 8, 2016
    Applicant: FANUC CORPORATION
    Inventors: Takafumi Murakami, Michinori Maeda
  • Publication number: 20150318657
    Abstract: A laser oscillator having a mechanism which makes it easy to correct distortion in the laser oscillator, and also has a simple structure. The laser oscillator has a housing located on an installation surface and a resonator held by the housing. The resonator has a total reflecting mirror, an outputting mirror, a discharge tube positioned between the mirrors, and a laser power source which injects excitation energy into the laser medium such as the carbon dioxide gas within the discharge tube. The resonator is held on the housing by means of a holding mechanism, such as a clamp, a bolt or a bearing. The laser oscillator has at least three nonextendable legs having a constant height, and at least one extendable leg having an adjustable height, so that the legs extend from a lower part of the housing.
    Type: Application
    Filed: April 30, 2015
    Publication date: November 5, 2015
    Applicant: FANUC CORPORATION
    Inventors: Takafumi Murakami, Michinori Maeda
  • Patent number: 8958454
    Abstract: The slant of a first mirror (21), the slant of a second mirror (22), and the laser output when the slant of the first mirror (21) is an initial value and when the slant of the first mirror (21) is made to move from the initial value by exactly a predetermined value in the positive and negative directions are used as the basis to calculate a first approximation curve of the laser output with respect to the slant of the first mirror (21) and second approximation curve of the laser output with respect to the slant of the second mirror (22), set a value which corresponds to a local maximum value of the first approximation curve as the slant of the first mirror (21), and set a value which corresponds to a local maximum value of the second approximation curve as the slant of the second mirror (21).
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: February 17, 2015
    Assignee: Fanuc Corporation
    Inventors: Takanori Sato, Takafumi Murakami
  • Publication number: 20140211824
    Abstract: According to the present invention, a laser oscillator includes at least two mirrors and mirror holding units for holding the at least two mirrors such that the two mirrors can be inclined with respect to an optical axis. Each of the mirror holding units includes two inclination adjustment units configured to incline corresponding mirror, a pivot point portion configured to function as a pivot point when the mirror is inclined, and one inclination measuring unit configured to measure an inclination amount of the mirror inclined by the two inclination adjustment units. The inclination measuring unit is disposed in a region other than on straight lines connecting the pivot point portion with each of the inclination adjustment units.
    Type: Application
    Filed: January 27, 2014
    Publication date: July 31, 2014
    Applicant: FANUC CORPORATION
    Inventors: TAKANORI SATO, TAKAFUMI MURAKAMI
  • Publication number: 20140211825
    Abstract: The slant of a first mirror (21), the slant of a second mirror (22), and the laser output when the slant of the first mirror (21) is an initial value and when the slant of the first mirror (21) is made to move from the initial value by exactly a predetermined value in the positive and negative directions are used as the basis to calculate a first approximation curve of the laser output with respect to the slant of the first mirror (21) and second approximation curve of the laser output with respect to the slant of the second mirror (22), set a value which corresponds to a local maximum value of the first approximation curve as the slant of the first mirror (21), and set a value which corresponds to a local maximum value of the second approximation curve as the slant of the second mirror (21).
    Type: Application
    Filed: January 27, 2014
    Publication date: July 31, 2014
    Applicant: FANUC CORPORATION
    Inventors: Takanori Sato, Takafumi Murakami
  • Publication number: 20130315274
    Abstract: A gas laser device including a blower circulating a laser gas along a gas passage; a pressure detection section detecting a gas pressure of the laser gas in the gas passage; a gas supply and exhaust section supplying the laser gas to the gas passage and exhausting the laser gas from the gas passage; an instruction section instructing a temporary stop of a laser oscillation by a laser oscillator; and a control section controlling the blower and the gas supply and exhaust section in response to an instruction from the instruction section. The control section, once the instruction section instructs the temporary stop, controls the blower to reduce the rotation of the blower or stop the rotation of the blower and controls the gas supply and exhaust section so that the gas pressure detected is a second target gas pressure corresponding to a first target gas pressure during the rotation of the blower.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 28, 2013
    Applicant: FANUC CORPORATION
    Inventors: Takafumi MURAKAMI, Akihiko NISHIO
  • Patent number: 8317943
    Abstract: Disclosed is a ball for a constant velocity joint, and a method for producing the same. The ball for a constant velocity joint is produced via a quenching step for heating a spherical body consisting of a material corresponding to a high carbon chromium bearing steel regulated by Japanese Industrial Standards (JIS) to 840-900° C. and then cooling the spherical body under such a condition as 10-25 vol. % of austenite remains up to a first part where the depth from the surface is 0.1 mm, a step for tempering the spherical body at 150° C. or more, and a step for shot peening the spherical body and imparting a compression residual stress of ?1000 MPa or more to a region reaching second part where the depth from the surface is 0.2 mm.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: November 27, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takafumi Murakami, Naoto Shibata, Shunta Osako
  • Patent number: 8135051
    Abstract: A gas laser oscillator includes a plurality of discharge tube arrays, each discharge tube array including a plurality of electrical discharge tubes, a support mechanism supporting the plurality of discharge tube arrays, and an optical part optically connecting the plurality of discharge tube arrays. The support mechanism includes a discharge tube linking holder and an elastic member. The elastic member joins the discharge tube linking holder to a first support rod arranged at an upper side as seen in a direction of gravity.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: March 13, 2012
    Assignee: Fanuc Ltd
    Inventors: Takanori Sato, Takafumi Murakami, Yuji Nishikawa
  • Publication number: 20110243177
    Abstract: A gas laser device including a blower circulating a laser gas along a gas passage; a pressure detection section detecting a gas pressure of the laser gas in the gas passage; a gas supply and exhaust section supplying the laser gas to the gas passage and exhausting the laser gas from the gas passage; an instruction section instructing a temporary stop of a laser oscillation by a laser oscillator; and a control section controlling the blower and the gas supply and exhaust section in response to an instruction from the instruction section.
    Type: Application
    Filed: March 2, 2011
    Publication date: October 6, 2011
    Applicant: FANUC CORPORATION
    Inventors: Akihiko Nishio, Takafumi MURAKAMI
  • Publication number: 20110162765
    Abstract: Disclosed is a ball for a constant velocity joint, and a method for producing the same. The ball for a constant velocity joint is produced via a quenching step for heating a spherical body consisting of a material corresponding to a high carbon chromium bearing steel regulated by Japanese Industrial Standards (JIS) to 840-900° C. and then cooling the spherical body under such a condition as 10-25 vol. % of austenite remains up to a first part where the depth from the surface is 0.1 mm, a step for tempering the spherical body at 150° C. or more, and a step for shot peening the spherical body and imparting a compression residual stress of ?1000 MPa or more to a region reaching second part where the depth from the surface is 0.2 mm.
    Type: Application
    Filed: May 22, 2009
    Publication date: July 7, 2011
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Takafumi Murakami, Naoto Shibata, Shunta Osako
  • Patent number: 7720118
    Abstract: A laser unit having a preparatory function for activating the unit and an activation method for the unit, capable of stabilizing the temperature of each component of the laser unit in the preparation stage when the laser unit is activated in a low-temperature or high-temperature environment, and then effectively judging completion of the preparation. During a period of time Ta from T1 to T2, a first trial of laser oscillation is performed. After a period of time Tb in which the laser is not oscillated, a second trial of laser oscillation from T3 to T4. Such an operation is repeated until a predetermined criterion is satisfied. Laser output values P2, P4, P6, . . . , at the last moment in each trial of laser oscillation are recorded. Then, each difference between the laser outputs at the last moments of two neighboring or continuous trials, is calculated. When the difference is lower than a predetermined criterion value, the preparation of the laser unit is judged to be completed.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: May 18, 2010
    Assignee: FANUC Ltd
    Inventors: Yuji Nishikawa, Takafumi Murakami, Akihiko Nishio
  • Patent number: 7664155
    Abstract: A gas laser oscillating unit having a gas junction part where gas flow may be stable, whereby a stable laser beam output and/or a laser beam that does not fluctuate very much may be achieved. The laser gas, flowing through first and second excitation parts, is introduced into the first and second tapered gas flow passages. After that, the two gas flows are mixed at or near the center point of a gas junction part and the mixed gas flows in a next flow passage. Then, one of the gas flows from the first excitation part is biased toward the ?X direction by a first biasing member arranged in the first gas flow passage, and the other gas flow from the second excitation part is biased toward the +X direction by a second biasing member arranged in the second gas flow passage.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: February 16, 2010
    Assignee: Fanuc Ltd
    Inventors: Akira Egawa, Takafumi Murakami, Akihiko Nishio
  • Publication number: 20100014552
    Abstract: A gas laser oscillator including a plurality of discharge tube arrays, each including a plurality of electrical discharge tubes aligning in an axial direction thereof; a support mechanism supporting the discharge tube arrays with axes thereof extending in directions parallel to each other; and an optical part optically connecting the discharge tube arrays to each other with all of the electrical discharge tubes being arranged optically in series. The optical part includes an output mirror and a rear mirror, disposed at a pair of electrical discharge tubes located at opposite ends of an optically serial arrangement of the discharge tube arrays supported by the support mechanism; and a returning mirror disposed at an optical connection between the discharge tube arrays supported by the support mechanism.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 21, 2010
    Applicant: FANUC LTD
    Inventors: Takanori SATO, Takafumi MURAKAMI, Yuji NISHIKAWA