Patents by Inventor Hiromitsu Takahashi
Hiromitsu Takahashi 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: 8901449Abstract: A spot welding system including a welding gun with an openable/closable electrode pair; and a dressing determination device determining a quality of a shaping process applied to an electrode of the electrode pair. The dressing determination device includes a visual sensor obtaining an image of the electrode, identifying a base and a tip of the electrode on the image and measuring a distance between the base and the tip on the image, by image processing; a visual sensor control section allowing the visual sensor to measure the distance immediately before and after the shaping process is performed; a cut amount calculation section calculating a difference between the distances measured by the visual sensor immediately before and after the shaping process is performed, as a cut amount of the electrode; and a cut amount judgment section judging whether the calculated cut amount is within a predetermined acceptable range.Type: GrantFiled: March 17, 2011Date of Patent: December 2, 2014Assignee: Fanuc CorporationInventors: Yuusuke Takayama, Hiromitsu Takahashi
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Patent number: 8513560Abstract: A spot welding system including a spot welding gun having a pair of electrodes disposed opposite to each other, and a servo motor for allowing the pair of electrodes to approach each other and separate from each other; a robot for movably holding either a spot welding gun or a workpiece so that a workpiece is disposed between the pair of electrodes of the spot welding gun; a physical quantity detection section for detecting a physical quantity correlative to torque or velocity of the servo motor; a position detection section for detecting positions of the pair of electrodes; a mode switching section for switching, by a switching command, an operation mode of the spot welding system between a spot welding mode for spot-welding the workpiece and a position correction mode for correcting a spot welding position of the workpiece; and a processing section for performing a spot welding process in the spot welding mode and a position correction process in the position correction mode.Type: GrantFiled: November 11, 2010Date of Patent: August 20, 2013Assignee: Fanuc CorporationInventors: Hiromitsu Takahashi, Masanobu Hatada, Toshimichi Aoki, Akinori Nishimura
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Publication number: 20130112885Abstract: [Problems to be Solved] A phoswich radiation detector, which can easily discriminate between detection signals on gamma rays and thermal neutrons, and which can selectively acquire signals on thermal neutrons, is provided. [Means to Solve the Problems] In a phoswich radiation detector having two scintillators and discriminating between thermal neutrons and gamma rays, the detector comprises a scintillator for detecting thermal neutrons, such as LiCaAlF6:Eu, which has a light yield of more than 1500 photons/neutron, and a scintillator for detecting gamma rays, which has a permeable end on a shorter wavelength than the light emission wavelength of the thermal neutron scintillator.Type: ApplicationFiled: July 20, 2011Publication date: May 9, 2013Applicants: HIROSHIMA UNIVERSITY, TOHOKU UNIVERSITY, TOKUYAMA CORPORATIONInventors: Hiromitsu Takahashi, Mitsuo Yonetani, Masayuki Matsuoka, Yasushi Fukazawa, Noriaki Kawaguchi, Kentaro Fukuda, Toshihisa Suyama, Akira Yoshikawa, Takayuki Yanagida, Yui Yokota, Yutaka Fujimoto
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Publication number: 20130105707Abstract: [Problems to be Solved] A radiation detector, which is improved in the detection efficiency of a photodetector for light emitted by a scintillator, which has excellent long-term operational stability, and which is excellent in time resolution and count rate characteristics, is provided with the use of the scintillator with a short fluorescence lifetime. [Means to Solve the Problems] A radiation detector is constructed by installing an optical wavelength conversion layer, which is composed of, for example, an organic fluorescent substance using polyvinyltoluene as a base material, between a scintillator composed of a fluoride single crystal, such as a Ce-containing LiCaAlF6 crystal, and a photodetector having a light entrance window material composed of a transparent glass material such as borosilicate glass. In the radiation detector, the peak wavelength of light emitted by the scintillator is 360 nm or less, and the peak wavelength of light after conversion by the optical conversion layer is 400 nm or more.Type: ApplicationFiled: July 20, 2011Publication date: May 2, 2013Applicants: HIROSHIMA UNIVERSITY, TOHOKU UNIVERSITY, TOKUYAMA CORPORATIONInventors: Hiromitsu Takahashi, Mitsuo Yonetani, Masayuki Matsuoka, Yasushi Fukazawa, Noriaki Kawaguchi, Kentaro Fukuda, Toshihisa Suyama, Akira Yoshikawa, Takayuki Yanagida, Yui Yokota, Yutaka Fujimoto
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Patent number: 8426761Abstract: A spot welding system including spot welding gun having a movable electrode driven by a servo motor, a counter electrode arranged facing it and with a multiarticulated robot, holding one of the welding workpiece and spot welding gun which moves welding workpiece and spot welding gun relative to each other and thereby make the movable electrode and the welding workpiece approach each other from a separated state or vice-versa, monitoring the current or torque of the servo motor, and detecting the surface position of the welding workpiece from the position of the movable electrode and the position of the multiarticulated robot when the trend of the current or torque changes. The precision of detection of the surface position of the welding workpiece by a movable electrode in a spot welding system can now be improved without lengthening the time required for detection of the surface position of the welding workpiece.Type: GrantFiled: September 16, 2010Date of Patent: April 23, 2013Assignee: Fanuc LtdInventors: Hiromitsu Takahashi, Toshimichi Aoki, Akinori Nishimura
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Publication number: 20120074112Abstract: An arc welding method which makes a welding torch or welding object which is supported by a robot move and performs arc welding using a welding start point on the welding object as a start point, which method includes a step of feeding a weld wire to the welding start point, a step of stopping the feed of the weld wire after a tip of the weld wire contacts the welding object, a step of supplying a pre-arc welding power in a range where no arc is generated to input heat to the weld wire and the welding object, a step of supplying an arc generating welding power which causes generation of an arc while retracting the weld wire, and a step of supplying main welding power to perform main welding and which method reduces occurrences of spatter at the time of arc start.Type: ApplicationFiled: August 23, 2011Publication date: March 29, 2012Applicant: FANUC CorporationInventors: Shun Kotera, Kouji Nakabayashi, Hiromitsu Takahashi
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Publication number: 20110240605Abstract: A spot welding system including a welding gun with an openable/closable electrode pair; and a dressing determination device determining a quality of a shaping process applied to an electrode of the electrode pair. The dressing determination device includes a visual sensor obtaining an image of the electrode, identifying a base and a tip of the electrode on the image and measuring a distance between the base and the tip on the image, by image processing; a visual sensor control section allowing the visual sensor to measure the distance immediately before and after the shaping process is performed; a cut amount calculation section calculating a difference between the distances measured by the visual sensor immediately before and after the shaping process is performed, as a cut amount of the electrode; and a cut amount judgment section judging whether the calculated cut amount is within a predetermined acceptable range.Type: ApplicationFiled: March 17, 2011Publication date: October 6, 2011Applicant: FANUC CORPORATIONInventors: Yuusuke TAKAYAMA, Hiromitsu TAKAHASHI
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Publication number: 20110180516Abstract: A position detection device for a workpiece to be welded including a spot welding gun having a pair of electrodes adapted to be disposed opposite each other across the workpiece; a robot for holding either one of the spot welding gun and the workpiece in a manner movable relate to each other; a servo motor for allowing the pair of electrodes to approach the workpiece and separate from the workpiece; a physical quantity detection section for detecting a physical quantity correlative to a torque of the servo motor when the servo motor allows one of the pair of electrodes to approach a surface of the workpiece so that the one of the pair of electrodes abuts against the surface of the workpiece; a position detection section for detecting positions of the pair of electrodes; a storage section for storing the physical quantity detected by the physical quantity detection section and a value detected by the position detection section; and a computation section for calculating a contact start time at which the one ofType: ApplicationFiled: December 27, 2010Publication date: July 28, 2011Applicant: FANUC LTDInventors: Hiromitsu TAKAHASHI, Toshimichi Aoki, Masanobu Hatada, Akinori Nishimura
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Publication number: 20110120978Abstract: A spot welding system including a spot welding gun having a pair of electrodes disposed opposite to each other, and a servo motor for allowing the pair of electrodes to approach each other and separate from each other; a robot for movably holding either a spot welding gun or a workpiece so that a workpiece is disposed between the pair of electrodes of the spot welding gun; a physical quantity detection section for detecting a physical quantity correlative to torque or velocity of the servo motor; a position detection section for detecting positions of the pair of electrodes; a mode switching section for switching, by a switching command, an operation mode of the spot welding system between a spot welding mode for spot-welding the workpiece and a position correction mode for correcting a spot welding position of the workpiece; and a processing section for performing a spot welding process in the spot welding mode and a position correction process in the position correction mode.Type: ApplicationFiled: November 11, 2010Publication date: May 26, 2011Applicant: FANUC CORPORATIONInventors: Hiromitsu TAKAHASHI, Masanobu HATADA, Toshimichi AOKI, Akinori NISHIMURA
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Publication number: 20110089146Abstract: A spot welding system including spot welding gun having a movable electrode driven by a servo motor, a counter electrode arranged facing it and with a multiarticulated robot, holding one of the welding workpiece and spot welding gun which moves welding workpiece and spot welding gun relative to each other and thereby make the movable electrode and the welding workpiece approach each other from a separated state or vice-versa, monitoring the current or torque of the servo motor, and detecting the surface position of the welding workpiece from the position of the movable electrode and the position of the multiarticulated robot when the trend of the current or torque changes. The precision of detection of the surface position of the welding workpiece by a movable electrode in a spot welding system can now be improved without lengthening the time required for detection of the surface position of the welding workpiece.Type: ApplicationFiled: September 16, 2010Publication date: April 21, 2011Applicant: FANUC LTDInventors: Hiromitsu TAKAHASHI, Toshimichi AOKI, Akinori Nishimura
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Patent number: 7868266Abstract: Spot welding system including a welding gun with an electrode pair actuated by a servo-motor, a robot carrying the welding gun or objective workpieces and operating to change an relative positions and orientations of the welding gun and an workpieces, and a gun motion controller controlling the servo-motor to actuate the electrode pair. The gun motion controller includes a motion commanding section outputting motion commands to the servo-motor in accordance with a speed set-value designating a closing speed of the electrode pair, and a set-value adjusting section automatically adjusting the speed set-value to an appropriate value.Type: GrantFiled: June 12, 2008Date of Patent: January 11, 2011Assignee: Fanuc LtdInventors: Hiromitsu Takahashi, Toshimichi Aoki
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Patent number: 7863539Abstract: A positioning method of a spot welding robot, the spot welding robot having a movable electrode tip and an opposition electrode tip opposed to the movable electrode tip. The method sandwiches a work piece to be welded between the pair of electrode tips and includes driving the movable electrode tip towards the opposition electrode tip with a servo motor and stopping the movement upon contact based upon a prescribed current value. The method further includes measuring an open separation of two opposing tips between the movable electrode tip and the opposition electrode tip and moving the opposition electrode tip towards the moveable electrode tip based upon the preset value and the open separation of the two opposing tips.Type: GrantFiled: June 16, 2008Date of Patent: January 4, 2011Assignee: Fanuc LtdInventors: Hiromitsu Takahashi, Toshimichi Aoki
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Patent number: 7600435Abstract: A method of determining deterioration of pressurizing performance of a spot welding, the method having: obtaining reference data that reflect a dynamic state of a servo motor in a case where a movable side electrode tip is operated normally and a wok piece is pressurized by a specified pressurizing force; performing data processing on the reference data to extract a reference characteristic value; obtaining diagnostic data that reflect a dynamic state of the servo motor in a case where a operational state of the movable side electrode tip changes and the work piece is no longer pressurized by a specified pressurizing force; performing data processing on the diagnostic data to extract a diagnostic characteristic value; and determining deterioration of pressurizing performance of the spot welding gun based on the reference characteristic value and the diagnostic characteristic value.Type: GrantFiled: July 1, 2008Date of Patent: October 13, 2009Assignee: Fanuc LtdInventors: Toshimichi Aoki, Hiromitsu Takahashi
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Patent number: 7495192Abstract: An arc welding apparatus includes a single-electrode type welding torch, a single wire feeder supplied with a plurality of welding wires and having a plurality of wire drivers for driving the plurality of welding wires, and a welding controller for controlling operations of the welding torch and the wire feeder. The welding controller selectively operates any one of the plurality of wire drivers to feed only a single welding wire to the welding torch and performs the arc welding. An arc welding robot system includes the arc welding apparatus, a robot mechanical part for holding the welding torch of the arc welding apparatus, and a robot controller for controlling operation of the robot mechanical part.Type: GrantFiled: January 17, 2006Date of Patent: February 24, 2009Assignee: Fanuc LtdInventors: Hiromitsu Takahashi, Toshihiko Inoue
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Publication number: 20090007693Abstract: A method of determining deterioration of pressurizing performance of a spot welding, the method having: obtaining reference data that reflect a dynamic state of a servo motor in a case where a movable side electrode tip is operated normally and a wok piece is pressurized by a specified pressurizing force; performing data processing on the reference data to extract a reference characteristic value; obtaining diagnostic data that reflect a dynamic state of the servo motor in a case where a operational state of the movable side electrode tip changes and the work piece is no longer pressurized by a specified pressurizing force; performing data processing on the diagnostic data to extract a diagnostic characteristic value; and determining deterioration of pressurizing performance of the spot welding gun based on the reference characteristic value and the diagnostic characteristic value.Type: ApplicationFiled: July 1, 2008Publication date: January 8, 2009Applicant: FANUC LTDInventors: Toshimichi AOKI, Hiromitsu TAKAHASHI
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Publication number: 20090001056Abstract: A positioning method of spot welding robot having: (A) moving a welding gun with a separation between an opposition electrode tip and a movable electrode tip kept open and larger than a preset plate thickness of a work piece so as to position the opposition electrode tip and the movable electrode tip on both sides of the work piece in a plate-thickness direction of the work piece, respectively, and temporarily positioning the opposition electrode tip at a stand-by position; (B) moving the movable electrode tip in a direction approaching toward the opposition electrode tip, monitoring the current value of the servo motor driving the movable electrode tip, and when the current value exceeds a prescribed value, determining that a distal end of the movable electrode tip has been brought into contact with the work piece, stopping a movement of the movable electrode tip and measuring an open separation of two opposing tips between the movable electrode tip and the opposition electrode tip that has been temporarilyType: ApplicationFiled: June 16, 2008Publication date: January 1, 2009Applicant: FANUC LTDInventors: Hiromitsu TAKAHASHI, Toshimichi AOKI
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Publication number: 20080308533Abstract: A spot welding system including a welding gun with an electrode pair actuated by a servo-motor, a robot carrying the welding gun or objective workpieces and operating to change the relative positions and orientations of the welding gun and the workpieces, and a gun motion controller controlling the servo-motor to actuate the electrode pair to open or close. The gun motion controller includes a motion commanding section outputting a motion command to the servo-motor in accordance with a speed set-value designating a closing speed of the electrode pair, and a set-value adjusting section automatically adjusting the speed set-value to an appropriate value.Type: ApplicationFiled: June 12, 2008Publication date: December 18, 2008Applicant: FANUC LTDInventors: Hiromitsu Takahashi, Toshimichi Aoki
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Publication number: 20080297906Abstract: An anisotropic diffusion film has a high brightness, high luminance uniformity ratio and a high productivity, and is suitable essentially for a surface light source of planar display devices for liquid crystal display devices and the like, such as a direct backlight. In the anisotropic diffusion film, a stripe-shaped convex lens is formed on one surface of a substrate film. The cross-sectional shape of a plane vertical to the stripe direction satisfies the following conditions that (A-C) and the whole of light transmittance of the anisotropic diffusion film is 70% or more: A: the contour of the projecting part of the cross-sectional shape is a curved line; B: the aspect ratio of the projecting part of the cross-sectional shape is 1 or more but not more than 3; and C: the distance between the apexes of the adjacent projecting parts of the cross-sectional shape is 10 ?m or more but not more than 100 ?m.Type: ApplicationFiled: June 14, 2005Publication date: December 4, 2008Applicant: TORAY INDUSTRIES, INC.Inventors: Kozo Takahashi, Akikazu Kikuchi, Hiromitsu Takahashi
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Patent number: 7411780Abstract: A display member, particularly a plasma display member, can be produced by a process including applying a paste which includes a urethane compound and inorganic fine particles onto a substrate and then firing the paste. The display member has a post-firing pattern without any defect.Type: GrantFiled: September 30, 2004Date of Patent: August 12, 2008Assignee: Toray Industries, Inc.Inventors: Hiroko Uegaki, Norikazu Tabata, Takai Masaki, Hiromitsu Takahashi, Akihiko Tanaka, Mitsuyo Hashimoto
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Publication number: 20080129931Abstract: The present invention provides a polarizer which can be obtained by an easy process without going through a complex process, a method for producing the same, and a liquid crystal display device that exhibits high brightness using the same. A polarizer containing, a substrate having a parallel linear pattern provided with convex portions having widths of w=20 to 380 nm with pitches of p=50 to 400 nm, and a metal layer formed on a surface side having the linear pattern of the substrate.Type: ApplicationFiled: December 7, 2005Publication date: June 5, 2008Applicant: Toray Industries, Inc. a corporation of JapanInventors: Hiromitsu Takahashi, Shigeru Aoyama, Kozo Takahashi