Patents by Inventor Tomofumi Yamashita
Tomofumi Yamashita 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: 20240145765Abstract: A non-aqueous electrolyte power storage device in which a coating material having a silanol group is present at least on a surface of an electrode active material layer and a sulfur-based material is contained in a cell, the electrode active material layer contains an electrode active material and a resin-based binder, the electrode active material is an active material capable of being alloyed with a metal element identical to an ion species responsible for electrical conduction or an active material capable of absorbing ions responsible for electrical conduction, and the coating material having a silanol group is a silicate containing a siloxane bond as a component or a silica fine particle aggregate (containing a siloxane bond as a component).Type: ApplicationFiled: October 14, 2020Publication date: May 2, 2024Applicants: ATTACCATO Limited Liability Company, ADEKA CorporationInventors: Takashi Mukai, Naoto Yamashita, Yuta Ikeuchi, Taichi Sakamoto, Kenji Kakiage, Tomofumi Yokomizo, Yohei Aoyama
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Publication number: 20240096650Abstract: A substrate processing apparatus of processing a substrate by using a processing fluid in a supercritical state, the substrate processing apparatus includes: a processing container in which the substrate is accommodated; a supply line connecting the processing container to a fluid source configured to send out the processing fluid in the supercritical state; a discharge line configured to discharge the processing fluid from the processing container; a control valve interposed in the discharge line; and a controller configured to control a pressure in the processing container by adjusting an opening degree of the control valve. In a circulation process in which the processing fluid is supplied to the processing container from the supply line, the controller is configured to adjust the opening degree of the control valve such that each of a pressure-lowering step and a pressure-raising step.Type: ApplicationFiled: September 13, 2023Publication date: March 21, 2024Inventors: Shogo FUKUI, Masami YAMASHITA, Tomofumi EMURA
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Patent number: 9737926Abstract: A ball screw is provided in which an outer circumferential formation is formed at a portion facing a ball circulating passage out of outer circumferential surface of a nut. The ball screw includes: a screw shaft having on its outer circumferential surface a screw groove; a nut having on its inner circumferential surface a screw groove facing the screw groove; a plurality of balls rollably loaded in a spiral ball rolling passage formed by both screw grooves; and a ball circulating passage to return the balls from a start point to an end point of the ball rolling passage for recirculation. The ball circulating passage is a concaved groove formed by concaving a groove on a part of the cylindrical inner circumferential surface of the nut by plastic working. Then, a flange is integrally provided at a portion facing the ball circulating passage and the screw groove.Type: GrantFiled: April 3, 2015Date of Patent: August 22, 2017Assignee: NSK Ltd.Inventors: Toru Harada, Koji Hashimoto, Tsuyoshi Ito, Tomofumi Yamashita, Naoya Aoki
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Patent number: 9685873Abstract: This invention is concerning a power supply device that includes a cut-off unit configured to cut off voltage to be applied to a primary winding of a transformer and a coil added in series with the primary winding of the transformer, a first circuit configured to cause, in a case where the voltage to be applied is cut off by the cut-off unit, current to flow in such a way that energy accumulated in the transformer is led to a capacitor, and a second circuit configured to clamp, in a case where the voltage to be applied is cut off by the cut-off unit, voltage of the primary winding and the coil.Type: GrantFiled: April 25, 2014Date of Patent: June 20, 2017Assignee: RICOH COMPANY, LTD.Inventor: Tomofumi Yamashita
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Publication number: 20160065076Abstract: This invention is concerning a power supply device that includes a cut-off unit configured to cut off voltage to be applied to a primary winding of a transformer and a coil added in series with the primary winding of the transformer, a first circuit configured to cause, in a case where the voltage to be applied is cut off by the cut-off unit, current to flow in such a way that energy accumulated in the transformer is led to a capacitor, and a second circuit configured to clamp, in a case where the voltage to be applied is cut off by the cut-off unit, voltage of the primary winding and the coil.Type: ApplicationFiled: April 25, 2014Publication date: March 3, 2016Applicant: Ricoh Company, Ltd.Inventor: Tomofumi Yamashita
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Publication number: 20150311805Abstract: A power supply device includes a power converter transformer, a coil, a first capacitor, and an energy regeneration circuit. The power converter transformer includes a primary winding and a secondary winding. The coil is provided on a primary side of the power converter transformer, and has a first end connected in series to a first end of the primary winding of the power converter transformer to store energy. The stored energy is regenerated in the first capacitor provided on the primary side of the power converter transformer by the energy regeneration circuit provided on the primary side of the power converter transformer.Type: ApplicationFiled: April 16, 2015Publication date: October 29, 2015Applicant: RICOH COMPANY, LTD.Inventor: Tomofumi YAMASHITA
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Publication number: 20150283600Abstract: A ball screw is provided in which an outer circumferential formation is formed at a portion facing a ball circulating passage out of outer circumferential surface of a nut. The ball screw includes: a screw shaft having on its outer circumferential surface a screw groove; a nut having on its inner circumferential surface a screw groove facing the screw groove; a plurality of balls rollably loaded in a spiral ball rolling passage formed by both screw grooves; and a ball circulating passage to return the balls from a start point to an end point of the ball rolling passage for recirculation. The ball circulating passage is a concaved groove formed by concaving a groove on a part of the cylindrical inner circumferential surface of the nut by plastic working. Then, a flange is integrally provided at a portion facing the ball circulating passage and the screw groove.Type: ApplicationFiled: April 3, 2015Publication date: October 8, 2015Inventors: Toru Harada, Koji Hashimoto, Tsuyoshi Ito, Tomofumi Yamashita, Naoya Aoki
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Publication number: 20150171702Abstract: An electric actuator includes a screw shaft that is mounted on one end of a drag bar, and that has a first helical groove on its outer peripheral surface; a rotor that has a hollow portion into which the screw shaft is arranged, wherein a second helical groove corresponding to the first helical groove is formed on a part of the inner peripheral surface of the hollow portion, and other end of the drag bar projects from the hollow portion; plural balls arranged between the first groove and the second groove; a deflector that is mounted to the rotor for circulating the balls; a stator that rotates the rotor so as to move the drag bar in its longitudinal direction; and a rotation preventing member that is engaged with a part of the drag bar so as to prevent the rotation of the drag bar.Type: ApplicationFiled: August 3, 2012Publication date: June 18, 2015Applicant: NSK LTD.Inventors: Yasuyuki Matsuda, Daisuke Gunji, Tomoharu Saito, Kazutaka Tanaka, Tomofumi Yamashita, Takashi Imanishi
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Patent number: 8950283Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.Type: GrantFiled: March 31, 2011Date of Patent: February 10, 2015Assignee: NSK Ltd.Inventors: Atsushi Watanabe, Toru Harada, Shouji Yokoyama, Kiyoshi Ootsuka, Koji Hashimoto, Kazuto Kobayashi, Toshio Nakamura, Shinobu Mogi, Shingo Saitou, Tomofumi Yamashita
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Patent number: 8809752Abstract: A boosting circuit includes a switch element, a first coil, a second coil, and a capacitor. The switch element generates a first alternating current voltage having a first frequency from a direct current voltage. The first coil generates a magnetic field around the first coil with a flow of the first alternating current voltage having the first frequency in the first coil. The first coil also induces an eddy current in the object with the magnetic field to inductively heat the object. The second coil is cumulatively connected to the first coil. The capacitor is connected to the first coil and the second coil in a parallel manner.Type: GrantFiled: March 20, 2007Date of Patent: August 19, 2014Assignee: Ricoh Company, Ltd.Inventor: Tomofumi Yamashita
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Patent number: 8656798Abstract: A linear actuator is provided which is able to simplify its structure by adding a stopper function, too, to a detent mechanism and to prevent generation of radial load. The linear actuator comprises a ball screw mechanism, to which a rotational driving force is transmitted, for converting a rotational motion into a linear motion. The ball screw mechanism comprises radially projecting guide projections provided in a linear motion component, and a guide groove arranged in a securing portion facing the linear motion component and is engaged with the guide projections to guide the guide projections in an axial direction. The guide projection has a projection projecting by the predetermined length, while engaging into the guide groove, at a stroke end of the linear motion component and a locking portion provided in a rotary motion component is locked to the projection of the guide projection.Type: GrantFiled: April 26, 2011Date of Patent: February 25, 2014Assignee: NSK Ltd.Inventors: Hiroshi Kawahara, Tooru Harada, Tomofumi Yamashita
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Publication number: 20130008275Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.Type: ApplicationFiled: March 31, 2011Publication date: January 10, 2013Applicant: NSK Ltd.Inventors: Atsushi Watanabe, Toru Harada, Shouji Yokoyama, Kiyoshi Ootsuka, Koji Hashimoto, Kazuto Kobayashi, Toshio Nakamura, Shinobu Mogi, Shingo Saitou, Tomofumi Yamashita
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Publication number: 20120325036Abstract: A ball screw is provided in which an outer circumferential formation is formed at a portion facing a ball circulating passage out of outer circumferential surface of a nut. The ball screw includes: a screw shaft having on its outer circumferential surface a screw groove; a nut having on its inner circumferential surface a screw groove facing the screw groove; a plurality of balls rollably loaded in a spiral ball rolling passage formed by both screw grooves; and a ball circulating passage to return the balls from a start point to an end point of the ball rolling passage for recirculation. The ball circulating passage is a concaved groove formed by concaving a groove on a part of the cylindrical inner circumferential surface of the nut by plastic working. Then, a flange is integrally provided at a portion facing the ball circulating passage and the screw groove.Type: ApplicationFiled: March 16, 2011Publication date: December 27, 2012Applicant: NSK Ltd.Inventors: Toru Harada, Koji Hashimoto, Tsuyoshi Ito, Tomofumi Yamashita, Naoya Aoki
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Patent number: 8297142Abstract: Since centers of a second gear, a fourth gear and a sixth gear coincide with each other and are disposed rotatably round a circumference of the same long shaft, a compact configuration can be realized while using a gear train of five gears to obtain a reduction gear ratio of a high gear ratio. The configuration in which the three gears have the same rotational center shaft in the way described above in an actuator which incorporates a plurality of gears is advantageous in that the number of center shafts is reduced and that the number of supporting holes in a housing which support center shafts is reduced.Type: GrantFiled: March 20, 2008Date of Patent: October 30, 2012Assignee: NSK Ltd.Inventors: Daisaku Kawada, Koji Hashimoto, Shingo Saito, Shinobu Mogi, Toru Harada, Manabu Horikoshi, Tomofumi Yamashita, Naoya Aoki, Atsushi Hirabayashi
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Publication number: 20120247240Abstract: A linear actuator is provided which is able to simplify its structure by adding a stopper function, too, to a detent mechanism and to prevent generation of radial load. The linear actuator comprises a ball screw mechanism, to which a rotational driving force is transmitted, for converting a rotational motion into a linear motion. The ball screw mechanism comprises radially projecting guide projections provided in a linear motion component, and a guide groove arranged in a securing portion facing the linear motion component and is engaged with the guide projections to guide the guide projections in an axial direction. The guide projection has a projection projecting by the predetermined length, while engaging into the guide groove, at a stroke end of the linear motion component and a locking portion provided in a rotary motion component is locked to the projection of the guide projection.Type: ApplicationFiled: April 26, 2011Publication date: October 4, 2012Inventors: Hiroshi Kawahara, Tooru Harada, Tomofumi Yamashita
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Patent number: 8196486Abstract: Since it is configured that an female screw groove 2a of a nut 2 extends round an axis of the nut 2 through 360 degrees or less and a sectional shape thereof taken at right angles to the groove contains a circular arc portion 2c of 90 degrees or less and a rectilinear portion 2d which connects to the circular arc portion at a bottom of the groove and extends in parallel with the axis, after molding, a lower mold LM and an upper mold UM can simply be removed from a barrel mold BM in the axial direction, and consequently, the necessity of provision of a parting plane which passes through the thread groove 2a can be obviated, thereby making it possible to easily form the thread groove 2a which is free from a difference in level or a stepped portion.Type: GrantFiled: September 5, 2006Date of Patent: June 12, 2012Assignee: NSK Ltd.Inventors: Toru Harada, Yoshinori Jingu, Tomofumi Yamashita, Shingo Saitou
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Patent number: 7986894Abstract: A disclosed power supply device includes a voltage resonance circuit configured to include an output coil for boosting an input direct-current voltage to a predetermined voltage and outputting the boosted voltage to a load and also include a capacitor connected to the output coil; and a switching unit configured to be turned ON/OFF so as to control electric current supply to the output coil. An auxiliary resonance circuit is connected in parallel with the output coil so as to reduce switching losses without using a power control circuit for switching control.Type: GrantFiled: August 27, 2008Date of Patent: July 26, 2011Assignee: Ricoh Company, Ltd.Inventors: Tomofumi Yamashita, Hiroyuki Shinohara, Shoji Totsuka, Nobuyuki Shigeyama, Katsuaki Murata
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Publication number: 20100184543Abstract: Since a threaded shaft 111 of a ball screw mechanism is disposed parallel to a pulley shaft 201 and an axial displacement of the threaded shaft 111 is converted into an axial displacement of a movable sheave 207 by a fork member 300 which swings, the inertia of a nut member 107 can be suppressed, and a high-speed control of a pulley width can easily be implemented. By the fork member 300 being interposed between the threaded shaft 111 and the movable sheave 207, even though the movable sheave 207 is inclined by a biased force of a belt 211, a the threaded shaft 111 is not inclined, thereby making it possible to suppress a reduction in fatigue life.Type: ApplicationFiled: September 5, 2008Publication date: July 22, 2010Applicant: NSK LTD.Inventors: Tomofumi Yamashita, Koji Hashimoto, Kazuya Suzuki
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Patent number: 7638925Abstract: A driving circuit converts a direct current (DC) power supply voltage into an alternating current voltage of a predetermined frequency. The alternating current voltage is applied to an electrical element and boosted by a voltage resonant circuit of the electrical element. Based on a change in input voltage of the electrical element and a frequency component of a feedback voltage corresponding to the output voltage of the electrical element, an input voltage monitoring circuit generates an optimal control signal, and, using the optimal control signal, adjusts the DC power supply voltage such that a step-down chopper circuit is switched on and off at a predetermined duty ratio.Type: GrantFiled: August 7, 2006Date of Patent: December 29, 2009Assignee: Ricoh Company, Ltd.Inventor: Tomofumi Yamashita
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Publication number: 20090067867Abstract: A disclosed power supply device includes a voltage resonance circuit configured to include an output coil for boosting an input direct-current voltage to a predetermined voltage and outputting the boosted voltage to a load and also include a capacitor connected to the output coil; and a switching unit configured to be turned ON/OFF so as to control electric current supply to the output coil. An auxiliary resonance circuit is connected in parallel with the output coil so as to reduce switching losses without using a power control circuit for switching control.Type: ApplicationFiled: August 27, 2008Publication date: March 12, 2009Inventors: Tomofumi Yamashita, Hiroyuki Shinohara, Shoji Totsuka, Nobuyuki Shigeyama, Katsuaki Murata