Patents by Inventor Takeshi Yamakawa
Takeshi Yamakawa 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: 8417389Abstract: There is proposed a control system and the like that can realize a CPG (Central Pattern Generator) network having high controllability. A control system (CPG network) includes a plurality of oscillation control devices (CPG) and one target signal generating device (rhythm generator (RG)). Each CPG and the RG are described by the Van der Pol equation, and an amplitude and a period of an output waveform are substantially independently controlled by an external signal. In order to control a phase difference between the CPGs, the period of each CPG is temporarily controlled through connections that are only conjunctions between the each CPG and the RG.Type: GrantFiled: February 20, 2009Date of Patent: April 9, 2013Assignee: National University Corporation Kyushu Institute of TechnologyInventors: Takeshi Yamakawa, Tatsuji Tokiwa
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Publication number: 20130070042Abstract: An optical scanning unit may include a light source unit configured to emit a light beam, an optical housing configured to receive and support the light source unit, an optical device configured to deflect the light beam and to focus the light beam on a light receiving member, and a fixing member configured to fix the light source unit to the optical housing by applying pressure to the light source unit, wherein the pressure is applied in a direction, which is substantially perpendicular to an optical axis direction of the light source unit.Type: ApplicationFiled: November 13, 2012Publication date: March 21, 2013Inventors: Takeshi YAMAKAWA, Hiroshi YOSHIZAWA, Katsunori SHOJI
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Patent number: 8368986Abstract: An optical scanning device includes: a light source; a polygon scanner that deflects a light beam output from the light source; and various types of optical elements for focusing the light beam deflected by the polygon scanner onto a desired position on a surface to be scanned, wherein a hole or a thin-walled portion that is provided on an arrangement surface of an optical housing on which the polygon scanner and an optical element having power in a sub-scanning direction are arranged, wherein the hole or a thin-walled portion extends along a main-scanning direction, and is provided near to the optical element having power in the sub-scanning direction between the polygon scanner and the optical element having power in the sub-scanning direction.Type: GrantFiled: February 1, 2011Date of Patent: February 5, 2013Assignee: Ricoh Company, Ltd.Inventors: Keiichi Serizawa, Takeshi Yamakawa, Kazunori Watanabe, Hiroshi Johno
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Patent number: 8339435Abstract: An optical scanning unit may include a light source unit configured to emit a light beam, an optical housing configured to receive and support the light source unit, an optical device configured to deflect the light beam and to focus the light beam on a light receiving member, and a fixing member configured to fix the light source unit to the optical housing by applying pressure to the light source unit, wherein the pressure is applied in a direction, which is substantially perpendicular to an optical axis direction of the light source unit.Type: GrantFiled: November 30, 2006Date of Patent: December 25, 2012Assignee: Ricoh Company, Ltd.Inventors: Takeshi Yamakawa, Hiroshi Yoshizawa, Katsunori Shoji
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Patent number: 8330786Abstract: An optical scanner includes at least one light source, an optical element, a deflective scanner, an optical housing, a pressing member, and a mounting member. The light source emits a light beam to an object. The optical element forms the light beam emitted from the light source into a desired shape. The deflective scanner deflects the light beam. The optical housing stores the optical element and the deflective scanner, and includes at least one positioning member. The positioning member positions the light source in an axial direction of the light source. The pressing member presses the light source toward the positioning member to sandwich the light source between the pressing member and the positioning member and mount the light source on the optical housing. The mounting member fastens the pressing member to the optical housing.Type: GrantFiled: May 29, 2009Date of Patent: December 11, 2012Assignee: Ricoh Company, Ltd.Inventors: Kazunori Watanabe, Takeshi Yamakawa
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Publication number: 20120302857Abstract: Proposed are a brain signal measurement system and the like, capable of carrying out in vivo placement of measurement units for measuring brain signals with a minimally invasive operation, as well as of easily adjusting the position of each measurement unit. The brain signal measurement device includes sensors to be provided in a space between a dura mater and an arachnoid mater, and a holding unit for holding the sensors. The sensors are connected by a shape-memory unit. The sensors are inserted through a hole penetrating through the scalp and so on, into a space between the dura mater and the arachnoid mater. The diameter of the hole can be equal to or smaller than 1 cm. By electrical heating, the shape-memory unit changes its shape to change positions of the sensors, and thus subdural electrodes can be placed with a minimally invasive operation.Type: ApplicationFiled: January 24, 2011Publication date: November 29, 2012Applicant: KYUSHU INSTITUTE OF TECHNOLOGYInventors: Toshitaka Yamakawa, Takeshi Yamakawa
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Patent number: 8184352Abstract: An optical scanning device of opposed scanning type, includes: a plurality of light sources, being arranged substantially symmetrically about a rotating deflection unit; a group of pre-deflection optical elements including optical elements that make the light beams incident on the rotating deflection unit; and scanning optical systems which are distributed to right and left with the rotating deflection unit as an axis of symmetry, wherein optical elements of the respective scanning optical systems are arranged substantially symmetrically about the rotating deflection unit, wherein a plurality of rib structures are arranged on respective areas of an optical housing substrate, the areas extends from the respective light sources to a vicinity of the rotating deflection unit, and the plurality of rib structures are arranged asymmetrically in the right and left optical systems with the rotating deflection unit as the axis of symmetry.Type: GrantFiled: February 3, 2011Date of Patent: May 22, 2012Assignee: Ricoh Company, LimitedInventors: Hiroshi Johno, Takeshi Yamakawa, Keiichi Serizawa, Kazunori Watanabe
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Publication number: 20120117722Abstract: A sanitary washing apparatus is provided according to one aspect of the invention, where the sanitary washing apparatus includes: a washing nozzle having a water discharge port, where the washing nozzle is configured to wash a body of a user by squirting water from the water discharge port; and a casing capable of storing the washing nozzle. The washing nozzle is configured to change from a stored state to an advanced state while transitioning to an orientation having a greater angle of an axis of the washing nozzle with respect to a horizontal plane, where the washing nozzle is stored in the casing in the stored state, and the washing nozzle is configured to wash the body in the advanced state.Type: ApplicationFiled: November 11, 2011Publication date: May 17, 2012Applicant: TOTO LTD.Inventors: Masayuki Mochita, Takeshi Yamakawa, Nobutake Sakumoto, Jun Kawamata, Mayako Adachi, Aiko Sato, Yosuke Inoue, Nanae Yamada
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Publication number: 20120062685Abstract: An optical scanner includes a light source, an optical part, a housing, and a retainer. The light source projects light against a target. The optical part is disposed on a light path between the light source and the target. The housing houses the light source and the optical part. The retainer fixed to the housing holds the optical part and includes a plurality of flanges disposed along an outer circumference of the retainer. One of the plurality of flanges of the retainer is adhered to the housing an adhesive agent. An image forming apparatus includes the optical scanner.Type: ApplicationFiled: September 9, 2011Publication date: March 15, 2012Applicant: Ricoh Company, Ltd.Inventors: Keiichi Serizawa, Takeshi Yamakawa, Kazunori Watanabe, Hiroshi Johno, Tomoya Fujii
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Publication number: 20110316958Abstract: An optical scanner includes a housing, a light source, a polygon mirror, an optical device, and a holder. The housing includes a mounting portion. The light source projects light. The polygon mirror is enclosed within the housing and rotates to deflect the light projected from the light source. The optical device is disposed substantially near the polygon mirror. The holder is disposed within the housing and attached to the housing at the mounting portion, and holds the optical device in place. A distance L1 between a center of rotation of the polygon mirror and the optical device is shorter than a distance L2 between the center of rotation of the polygon mirror and the mounting portion. An image forming apparatus includes the optical scanner.Type: ApplicationFiled: June 9, 2011Publication date: December 29, 2011Applicant: RICOH COMPANY, LTD.Inventors: HIROSHI JOHNO, TAKESHI YAMAKAWA, KEIICHI SERIZAWA, KAZUNORI WATANABE
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Publication number: 20110310455Abstract: A curve correction mechanism for correcting a direction and degree of curvature of a reflecting mirror that reflects a light beam includes an adjuster to contact and move a pressing member between a first position, where a first pressing portion of the pressing member presses against an outboard portion of the reflecting mirror provided outboard from a support that supports the reflecting mirror in a longitudinal direction of the reflecting mirror while a second pressing portion of the pressing member is isolated from the reflecting mirror, and a second position, where the second pressing portion of the pressing member presses against an inboard portion of the reflecting mirror provided inboard from the support while the first pressing portion of the pressing member is isolated from the reflecting mirror.Type: ApplicationFiled: June 7, 2011Publication date: December 22, 2011Inventors: Keiichi Serizawa, Hiroshi Johno, Takeshi Yamakawa, Kazunori Watanabe
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Publication number: 20110199663Abstract: An optical scanning device of opposed scanning type, includes: a plurality of light sources, being arranged substantially symmetrically about a rotating deflection unit; a group of pre-deflection optical elements including optical elements that make the light beams incident on the rotating deflection unit; and scanning optical systems which are distributed to right and left with the rotating deflection unit as an axis of symmetry, wherein optical elements of the respective scanning optical systems are arranged substantially symmetrically about the rotating deflection unit, wherein a plurality of rib structures are arranged on respective areas of an optical housing substrate, the areas extends from the respective light sources to a vicinity of the rotating deflection unit, and the plurality of rib structures are arranged asymmetrically in the right and left optical systems with the rotating deflection unit as the axis of symmetry.Type: ApplicationFiled: February 3, 2011Publication date: August 18, 2011Applicant: Ricoh Company, LimitedInventors: Hiroshi Johno, Takeshi Yamakawa, Keiichi Serizawa, Kazunori Watanabe
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Publication number: 20110199664Abstract: An optical scanning device includes: a light source; a polygon scanner that deflects a light beam output from the light source; and various types of optical elements for focusing the light beam deflected by the polygon scanner onto a desired position on a surface to be scanned, wherein a hole or a thin-walled portion that is provided on an arrangement surface of an optical housing on which the polygon scanner and an optical element having power in a sub-scanning direction are arranged, wherein the hole or a thin-walled portion extends along a main-scanning direction, and is provided near to the optical element having power in the sub-scanning direction between the polygon scanner and the optical element having power in the sub-scanning direction.Type: ApplicationFiled: February 1, 2011Publication date: August 18, 2011Applicant: Ricoh Company, LimitedInventors: Keiichi Serizawa, Takeshi Yamakawa, Kazunori Watanabe, Hiroshi Johno
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Publication number: 20110015790Abstract: There is proposed a control system and the like that can realize a CPG (Central Pattern Generator) network having high controllability. A control system (CPG network) includes a plurality of oscillation control devices (CPG) and one target signal generating device (rhythm generator (RG)). Each CPG and the RG are described by the Van der Pol equation, and an amplitude and a period of an output waveform are substantially independently controlled by an external signal. In order to control a phase difference between the CPGs, the period of each CPG is temporarily controlled through connections that are only conjunctions between the each CPG and the RG.Type: ApplicationFiled: February 20, 2009Publication date: January 20, 2011Applicant: National University Corporation Kyushu Institute of TechnologyInventors: Takeshi Yamakawa, Tatsuji Tokiwa
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Patent number: 7872664Abstract: An optical scanning device, that outputs a light beam through an emission window in an optical housing to scan a surface, may include a shutter member that closes or opens the emission window. The shutter member may include a first opening, that may allow the light beam passed through the emission window to pass the first opening, and a second opening, that may be at a position corresponding to an insertion operation of a cleaning member for cleaning the emission window. The shutter member may include a first opening, that may be on a front surface of the shutter member to allow the light beam passed through the emission window to pass the first opening, and a second opening, that may be on a side surface of the shutter member to allow a cleaning member to be inserted through the second opening for cleaning the emission window.Type: GrantFiled: September 25, 2006Date of Patent: January 18, 2011Assignee: Ricoh Company, LimitedInventors: Takeshi Yamakawa, Hiroshi Yoshizawa, Katsunori Shoji, Masanori Namba
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Patent number: 7869101Abstract: An optical scanning unit of an image forming apparatus may include: an optical housing configured to include at least one optical part and to have a light-beam emitting aperture through which a light beam can emanate from the optical housing; a shutter configured to cover the light-beam emitting aperture; and a driving unit configured to drive the shutter to and fro, thus opening and closing the light-beam emitting aperture. Such a driving unit further can operate to coordinate at least one of the opening and the closing to occur after activation and before deactivation of a writing operation conducted by the optical scanning unit, respectively.Type: GrantFiled: November 29, 2006Date of Patent: January 11, 2011Assignee: Ricoh Company, Ltd.Inventors: Katsunori Shoji, Takeshi Yamakawa, Hiroshi Yoshizawa
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Publication number: 20100274237Abstract: To provide a cooling needle probe and cooling system which can accurately cool a minute region. A cooling needle probe 10 includes a first cylindrical body 14 and second cylindrical body 12 which are made of thin-walled dissimilar metals and run longitudinally by being electrically insulated from each other. The first cylindrical body 14 and second cylindrical body 12 serve both as a flow path for a refrigerant and compensating leads of a thermocouple. The first cylindrical body 14 and second cylindrical body 12 are closed and joined at one end, forming a distal part 18, which also serves as a measuring junction of a thermocouple of a thermocouple. A minute communicating section 20 is formed near the distal part 18 to communicate between interior and exterior of the first cylindrical body 14.Type: ApplicationFiled: February 17, 2009Publication date: October 28, 2010Inventors: Takeshi Yamakawa, Lev Grigorievich Zimin, Yury L'vovich Zimin
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Publication number: 20100219076Abstract: Provided is a dielectrophoresis apparatus with which it is possible to handle (move, stop, separate and sort, etc.) a dielectric particle utilizing dielectrophoresis and to measure dielectrophoretic force. The interior of a dielectrophoresis device that includes a case having a flat top or bottom surface is filled with a dielectric solution S and accepts introduction of a small target body (particle) P comprising a dielectric. A non-uniform alternating electric field is formed within the case. By tilting the case (through an angle ?pitch or other direction), rotating the case in an inclined plane (through a rotational angle ?yaw) or adjusting the voltage and frequency of the alternating electric field, imbalance or balance is produced between a dielectrophoretic force FDEP that acts upon the small body and a force FG sin ?pitch ascribable to gravity and buoyancy, thereby enabling the small body to be moved and stopped.Type: ApplicationFiled: September 26, 2008Publication date: September 2, 2010Applicant: KYUSHU INSTITUTE OF TECHNOLOGYInventors: Takeshi Yamakawa, Hiroko Imasato
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Patent number: D671080Type: GrantFiled: September 21, 2011Date of Patent: November 20, 2012Assignee: Pacific Engineering Corp.Inventors: Hideki Andoh, Takeshi Yamakawa
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Patent number: D671504Type: GrantFiled: September 21, 2011Date of Patent: November 27, 2012Assignee: Pacific Engineering Corp.Inventors: Hideki Andoh, Takeshi Yamakawa