Patents by Inventor Shigeki Kawada
Shigeki Kawada 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: 11866596Abstract: An aqueous ink jet composition of the present disclosure includes: at least one dye selected from the group consisting of C.I. Solvent Yellow 160:1, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 184; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of an ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of a polyalkylene glycol; and an anionic dispersant.Type: GrantFiled: January 29, 2020Date of Patent: January 9, 2024Inventors: Kenji Kitada, Hiroko Hayashi, Yasunari Ikeda, Hisashi Okamura, Kenta Kikuchi, Hirofumi Hokari, Shinichi Naito, Kazumasa Otsuki, Michio Nakamori, Shinichi Yamamoto, Seiji Kagami, Shigeki Kawada
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Publication number: 20230303878Abstract: An ink set of the present disclosure includes a colored ink jet ink and a decoloring ink. The colored ink jet ink includes a leuco dye, a developer, and a dispersant, and the decoloring ink includes a solvent and water. The solvent includes a specific solvent component that has a Hansen solubility parameter that differs from the Hansen solubility parameter of the developer by an absolute value of less than or equal to 5.3. Preferably, the specific solvent component is a glycol ether or a glycol. Preferably, the leuco dye is a fluoran. Preferably, the developer is a compound containing a phenolic hydroxy group in the molecule.Type: ApplicationFiled: March 23, 2023Publication date: September 28, 2023Inventors: Shigeki KAWADA, Kenta KIKUCHI, Tetsuya AOYAMA, Hiroaki KUMETA
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Patent number: 11591489Abstract: An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.Type: GrantFiled: December 26, 2019Date of Patent: February 28, 2023Inventors: Hisashi Okamura, Hiroko Hayashi, Kenji Kitada, Yasunari Ikeda, Hirofumi Hokari, Shinichi Yamamoto, Michio Nakamori, Shigeki Kawada, Kenta Kikuchi, Kazumasa Otsuki, Seiji Kagami, Shinichi Naito
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Patent number: 11492506Abstract: An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.Type: GrantFiled: December 26, 2019Date of Patent: November 8, 2022Inventors: Yasunari Ikeda, Hirofumi Hokari, Shinichi Yamamoto, Shigeki Kawada, Michio Nakamori
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Publication number: 20210179875Abstract: A sublimation-transfer ink jet ink composition contains dyes and water, where the dyes include one or more yellow dyes and one or more blue dyes; the yellow dyes include C.I. Solvent Yellow 160:1; and the blue dyes include one or more selected from C.I. Disperse Blue 60, C.I. Disperse Blue 359, and C.I. Disperse Blue 360.Type: ApplicationFiled: December 15, 2020Publication date: June 17, 2021Inventors: Shigeki KAWADA, Yasunari IKEDA
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Publication number: 20200239718Abstract: An aqueous ink jet composition of the present disclosure includes: at least one dye selected from the group consisting of C.I. Solvent Yellow 160:1, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 184; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of an ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of a polyalkylene glycol; and an anionic dispersant.Type: ApplicationFiled: January 29, 2020Publication date: July 30, 2020Inventors: Kenji KITADA, Hiroko HAYASHI, Yasunari IKEDA, Hisashi OKAMURA, Kenta KIKUCHI, Hirofumi HOKARI, Shinichi NAITO, Kazumasa OTSUKI, Michio NAKAMORI, Shinichi YAMAMOTO, Seiji KAGAMI, Shigeki KAWADA
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Publication number: 20200207997Abstract: An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.Type: ApplicationFiled: December 26, 2019Publication date: July 2, 2020Inventors: Yasunari IKEDA, Hirofumi HOKARI, Shinichi YAMAMOTO, Shigeki KAWADA, Michio NAKAMORI
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Publication number: 20200207999Abstract: An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.Type: ApplicationFiled: December 26, 2019Publication date: July 2, 2020Inventors: Hisashi OKAMURA, Hiroko HAYASHI, Kenji KITADA, Yasunari IKEDA, Hirofumi HOKARI, Shinichi YAMAMOTO, Michio NAKAMORI, Shigeki KAWADA, Kenta KIKUCHI, Kazumasa OTSUKI, Seiji KAGAMI, Shinichi NAITO
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Patent number: 10487227Abstract: An ink set which is used for sublimation transfer includes a first ink, and a second ink. The first ink has a color after transfer of |a*|?10 and |b*|?10 in a CIELAB color space, and contains a first disperse dye dispersed by a first dispersion resin. The second ink has a color after transfer of |a*|>10 or |b*|>10 in the CIELAB color space, and contains a second disperse dye dispersed by a second dispersion resin. A glass transition temperature of the first dispersion resin and is different than that of the second dispersion resin.Type: GrantFiled: September 26, 2018Date of Patent: November 26, 2019Assignee: Seiko Epson CorporationInventors: Takayoshi Kagata, Hiroshi Fukumoto, Takeshi Yano, Miho Nakamura, Shugo Hattori, Katsuko Aoki, Shigeki Kawada
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Publication number: 20190092953Abstract: An ink set which is used for sublimation transfer includes a first ink, and a second ink. The first ink has a color after transfer of |a*|?10 and |b*|?10 in a CIELAB color space, and contains a first disperse dye dispersed by a first dispersion resin. The second ink has a color after transfer of |a*|>10 or |b*|>10 in the CIELAB color space, and contains a second disperse dye dispersed by a second dispersion resin. A glass transition temperature of the first dispersion resin and is different than that of the second dispersion resin.Type: ApplicationFiled: September 26, 2018Publication date: March 28, 2019Inventors: Takayoshi KAGATA, Hiroshi FUKUMOTO, Takeshi YANO, Miho NAKAMURA, Shugo HATTORI, Katsuko AOKI, Shigeki KAWADA
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Patent number: 5334924Abstract: Speed control of an induction motor is effected in digital fashion through use of a computer but without complex processing, and with a computer that need not be large in scale. This is accomplished by processing at least a speed command signal, actual speed signal and torque signal in analog fashion, enabling simplification of an induction motor speed control digital processing section which performs all other control operations in a digital manner. In a speed control network having a closed loop, a frequency-to-voltage converter, adder-subtractor, proportional integrator, polarity determining circuit absolute value circuit and voltage-to-frequency converter are constructed of circuitry operable on the basis of analog values, with all other circuits being constructed of circuitry operable on the basis of digital values.Type: GrantFiled: October 30, 1981Date of Patent: August 2, 1994Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Hiroshi Ishida
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Patent number: 5281903Abstract: A drive control method for a variable reluctance type motor capable of improving the motor efficiency by preventing generation of a disturbance torque. In function generators (8A to 8C) of a controller for embodying the method, the motor rotation direction and the motor driving mode are determined based on the generation order of A- and B-phase feedback pulses from a pulse coder (7) and the sign of a torque command (Tc) from a speed loop compensation circuit (1), and, on the basis of the determination results, either one of four excitation patterns is selected. Function signal values corresponding to actual motor electrical angles (.theta.) are generated from the function generators in accordance with the selected excitation pattern, and excitation of individual phases of the motor (6) is controlled by power amplifiers (4A to 4C) which respond to voltage commands derived based on these function signal values.Type: GrantFiled: September 11, 1991Date of Patent: January 25, 1994Assignee: Fanuc LtdInventors: Hideaki Oku, Yo Ikebe, Hidetsugu Komiya, Shigeki Kawada, Takeshi Nakamura
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Patent number: 4796352Abstract: In an AC servomotor constructed so that the outer circumference (21b) of a stator core (21) formed by laminating thin steel plates (22) is used as part of a motor housing, bearing mounting bores (25a, 26a) for receiving bearing members (27, 28) to be mounted on a pair of brackets (25, 26) attached to the front and rear ends of the stator core (21) and mounting surfaces (25b, 25c) of the motor are formed with accurate concentricity and squareness with reference to the center bore (21a) and the outer circumference (21b) of the stator core (21) after firmly joining the brackets (25, 26) to the stator core (21). Thus, a rotor (29) is supported with high accuracy in concentricity with the stator core (21) on the brackets (25, 26) and the squareness of the output shaft (29a) to the mounting surfaces (25b, 25c) is established.Type: GrantFiled: May 13, 1987Date of Patent: January 10, 1989Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
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Patent number: 4748360Abstract: A rotor for a synchronous motor, having a plurality of first magnetic poles formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke fixed to a rotatable motor shaft, and a second magnetic pole projecting radially from the yoke adjacently to each first magnetic pole and the second magnetic pole wherein the shape of the pole face of each first magnetic poles are in a circular arc and the shape of the pole face of each of second magnetic pole is determined by a given equation so that the magnetic flux distribution established by a pair of the first magnetic pole and the second magnetic pole is substantially equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator.Type: GrantFiled: April 24, 1987Date of Patent: May 31, 1988Assignee: Fanuc, Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
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Patent number: 4714852Abstract: A permanent-magnet field synchronous motor comprises a rotor body (22) having a cylindrical outer surface. A plurality of permanent magnets (25) attached to the cylindrical outer surface of the rotor body and arranged in the circumferential direction thereof form a field system. Each of the permanent magnets has an outer surface (25b) which extends circumferentially in parallel to the cylindrical outer surface of the rotor body and also has a constant thickness in the whole thereof. The inner surface and the outer surface of each of the permanent magnets has a certain configuration, respectively, each of which is composed of a plurality of straight lines and approximates to a contour line consisting of half-sine curves (S.sub.1, S.sub.2) extending between the circumferential opposite ends of each of the permanent magnets when developed in a plane surface.Type: GrantFiled: June 24, 1986Date of Patent: December 22, 1987Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Kazushi Kumagai
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Patent number: 4700097Abstract: A synchronous machine comprising a stator (41) having armature windings matching to a .phi. phase power source and S number of slots (42) accommodating the armature windings, and a rotor (31) having a number of field poles (32) identical with the P number of poles of the rotor (31) and magnets (33) for exciting the field pole (32), in which where the number of the slots per pole per phase S/P.phi. is expressed by an irreducible fraction m/n, the length (W) of the portion of the field pole (32) facing to the slots (42) of the stator (41) along the circular direction is selected out of the integer multiple value of 1/n of the slot (42) pitch length (L) in the stator (41), whereby slot ripple is reduced and the lack of uniformity of the velocity at light load operation is decreased when the synchronous machine is used as a servomotor.Type: GrantFiled: September 2, 1986Date of Patent: October 13, 1987Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
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Patent number: 4663550Abstract: A motor with DC brake having a DC electromagnetic brake (10) arranged on the shaft (14) of the rotor (16) thereof, in which a partial shaft (14b) extending through and outward from the DC electromagnetic brake (10) is formed of a nonmagnetic metal material. A partial shaft (14a) extending through the rotor (16) is formed of a free cutting metal material, and partial shafts (14a) and (14b) are coaxially united to form the integral shaft (14) at a junction (18) by friction welding.Type: GrantFiled: August 27, 1984Date of Patent: May 5, 1987Assignee: Fanuc LTDInventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Katsuya Sugahara
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Patent number: 4661736Abstract: A rotor for a synchronous motor, having a plurality of first magnetic poles (19) formed by a plurality of permanent magnets respectively and disposed at practically equal circumferential intervals on the outer circumference of a yoke (18) fixed to a rotatable motor shaft (14), and a second magnetic pole (18a) projecting radially from the yoke (18) adjacently to each first magnetic pole (19) so as to form a pair of a first magnetic pole (19) and the second magnetic pole (18a), wherein the shape of the pole face of each second magnetic pole (18a) is decided so that the magnetic flux distribution established by a pair of the first magnetic pole (19) and the second magnetic pole (18a) is practically equivalent to a sinusoidal magnetic flux distribution in the sweeping effect by the armature coils of each phase of the stator (11).Type: GrantFiled: July 30, 1985Date of Patent: April 28, 1987Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
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Patent number: 4631807Abstract: A permanent-magnet field rotor (10) includes a plurality of permanent magnets (18) disposed in a radial fashion, and yokes (19) disposed between each two successive permanent magnets (18) and made of a lot of sheet elements (20). The method of manufacturing the permanent-magnet field rotor comprises the step of stacking a lot of same shaped thin plate members (25) each having a plurality of sectoral york element portions (26) arranged in a radial fashion and link portions (27) each linking the outer circumferential edges of each two successive york element portions (26) to one another so as to define therebetween a permanent magnet receiving slot (29). In the state where permanent magnets (18) are inserted in the slots (29) of the stacked thin plate members (25), respectively, the stacked thin plate members (25) are firmly fixed to each other.Type: GrantFiled: February 11, 1985Date of Patent: December 30, 1986Assignee: Fanuc Ltd.Inventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu
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Patent number: 4626725Abstract: A synchronous rotary machine comprising a stacked stator iron core (21) made of a number of thin plates stacked in the axial direction. The stator iron core forms a part of the outer shell of the synchronous rotary machine. A winding (23) is wound around the stator iron core. A pair of brackets (24, 25) are attached to the opposite ends of the stator iron core. A rotor assembly (29) is rotatably supported on the brackets through bearings mounted to the brackets, respectively. The brackets and stator iron core are tightened in the axial direction thereof and firmly fixed to each other. At least two rods (31) having the same length are provided on the stator iron core. Each of the rods extends through the stator iron core in the axial direction. When the stator iron core is contracted to a predetermined length, the opposite end surfaces thereof abut against the brackets, respectively, and limit the distance between the brackets.Type: GrantFiled: October 25, 1985Date of Patent: December 2, 1986Assignee: Fanuc LtdInventors: Shigeki Kawada, Yoichi Amemiya, Masatoyo Sogabe, Noboru Iwamatsu