Patents by Inventor Hiroshi Seo
Hiroshi Seo 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: 20240105543Abstract: There is provided a power conversion apparatus including a first power semiconductor module, a second power semiconductor module, a control circuit for driving the first power semiconductor module and the second power semiconductor module, and liquid-cooling type cooling jackets, wherein the second power semiconductor module is disposed closer to an upper surface in the gravity direction than the first power semiconductor module is, the cooling jackets include a refrigerant containing hydrogen molecules and a refrigerant flow path at least between the first power semiconductor module and the second power semiconductor module, and the control circuit performs control such that the operating time period of the second power semiconductor module is shorter than the operating time period of the first power semiconductor module.Type: ApplicationFiled: August 3, 2023Publication date: March 28, 2024Applicant: Hitachi, Ltd.Inventors: Hiroshi Kamizuma, Hangxian Gao, Tetsuya Kawashima, Masahiro Seo
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Patent number: 11937498Abstract: A novel compound is provided. Alight-emitting device having high emission efficiency and a long lifetime is also provided. An organic compound is represented by General Formula (G2), in which a benzo[a]anthracene skeleton is bonded to the 2-position of an anthracene skeleton. In General Formula (G2), R1 to R3, R5 to R12, and R21 to R29 each independently represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms in a ring. Another embodiment of the present invention is a light-emitting device including the compound.Type: GrantFiled: May 22, 2019Date of Patent: March 19, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroshi Kadoma, Satoshi Seo, Hiroki Suzuki, Naoaki Hashimoto, Tsunenori Suzuki
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Patent number: 11925109Abstract: A novel organic compound with favorable thermophysical properties is provided. An organic compound represented by General Formula (G1) is provided. At least one of X1 to X5 is a secondary or tertiary alkyl group having 3 to 6 carbon atoms in which a carbon atom bonded to a phenyl group branches. Each of R1 to R7 is independently any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, and an unsubstituted or alkyl-substituted aryl group having 6 to 13 carbon atoms. Ar1 represents a substituted or unsubstituted condensed heteroaromatic ring skeleton having 8 to 60 carbon atoms and composed of two or more aromatic rings, and Ar2 represents a substituted or unsubstituted aryl group having 6 to 25 carbon atoms. Furthermore, n is any of 1 to 3.Type: GrantFiled: December 9, 2020Date of Patent: March 5, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Kyoko Takeda, Harue Osaka, Hiroshi Kadoma, Satoshi Seo, Tsunenori Suzuki, Naoaki Hashimoto
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Patent number: 11917908Abstract: A novel organic compound represented by General Formula (G1) is provided. In General Formula (G1), X1 and X2 each independently represent a secondary or tertiary alkyl group having 3 to 6 carbon atoms and having a branched carbon atom which is bonded to a phenyl group. In addition, Ar1 represents a substituted or unsubstituted condensed aromatic ring skeleton having 10 to 60 carbon atoms and composed of two or more rings or a substituted or unsubstituted condensed heteroaromatic ring skeleton having 8 to 60 carbon atoms and composed of two or more rings. Furthermore, Ar2 represents a substituted or unsubstituted aryl group having 6 to 25 carbon atoms. Moreover, n represents any of 1 to 3, and in the case where n is 2 or more, two or more groups bonded to Ar1 may be identical or different.Type: GrantFiled: December 9, 2020Date of Patent: February 27, 2024Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Kyoko Takeda, Harue Osaka, Hiroshi Kadoma, Satoshi Seo, Tsunenori Suzuki, Naoaki Hashimoto
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Patent number: 11906916Abstract: A heating device includes a planar heater, a rotator, a pressure rotator, a heating device frame, a resistor, and a discharger. The pressure rotator has a conductive outer surface and presses the rotator. The heating device frame holds the pressure rotator. The discharger is in contact with the conductive outer surface of the pressure rotator and grounded via the resistor and the heating device frame.Type: GrantFiled: May 9, 2022Date of Patent: February 20, 2024Assignee: Ricoh Company, Ltd.Inventors: Yuusuke Furuichi, Hiroshi Seo, Tomoya Adachi, Daisuke Hirano
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Publication number: 20240012353Abstract: Provided is an image forming apparatus including a toner, and a fixing device configured to fix an image formed with the toner on a recording medium. The fixing device includes a fixing belt that is an endless belt, and a planar member configured to heat the fixing belt. An environmental fluctuation rate X is 45% or greater but 85% or less, and the environmental fluctuation rate X is represented by: Environmental fluctuation rate X=(Q1?Q2)/{(Q1+Q2)/2} where Q1 is a quantity of electric charge of the toner in an environment having a temperature of 10 degrees Celsius and relative humidity of 15%, Q2 is a quantity of electric charge of the toner in an environment having a temperature of 27 degrees Celsius and relative humidity of 80%, and a unit for Q1 and Q2 is ?C/g.Type: ApplicationFiled: December 23, 2021Publication date: January 11, 2024Applicant: Ricoh Company, Ltd.Inventors: Yuusuke FURUICHI, Takamasa HASE, Hiroshi SEO, Hideki SUGIURA, Maiko KOEDA, Masahiko ISHIKAWA
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Publication number: 20220382191Abstract: A heating device includes a planar heater, a rotator, a pressure rotator, a heating device frame, a resistor, and a discharger. The pressure rotator has a conductive outer surface and presses the rotator. The heating device frame holds the pressure rotator. The discharger is in contact with the conductive outer surface of the pressure rotator and grounded via the resistor and the heating device frame.Type: ApplicationFiled: May 9, 2022Publication date: December 1, 2022Applicant: Ricoh Company, Ltd.Inventors: Yuusuke FURUICHI, Hiroshi SEO, Tomoya ADACHI, Daisuke HIRANO
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Publication number: 20210294229Abstract: An image forming apparatus includes a developing device accommodating toner, the toner containing: a binder resin; and a coloring agent; and a fixing device configured to fix a toner image formed with the toner on a recording medium, the fixing device comprising: a tubular belt member; a heating member configured to heat the tubular belt member directly or indirectly in contact with the tubular belt member; and a pressing member in contact with the tubular belt member, wherein the toner under a load of 2 kg has a flow index Tf of from 70 to 121 degrees C., a flow index Te of from 83 to 120 degrees C., and a softening index Tw of from 65 to 80 degrees C.Type: ApplicationFiled: March 17, 2021Publication date: September 23, 2021Inventors: Hideki SUGIURA, Maiko KOEDA, Masahiko ISHIKAWA, Hiroshi SEO, Yuusuke FURUICHI, Takamasa HASE
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Patent number: 10955777Abstract: A fixing device includes at least one temperature detector and a device-side connector. The at least one temperature detector is configured to detect a temperature of the fixing device. The device-side connector is configured to transmit a temperature detection signal from the at least one temperature detector to an image forming apparatus body by mutual contact between a terminal of the device-side connector and a terminal of a body-side connector of the image forming apparatus body. A lead wire of the at least one temperature detector is branched into a plurality of wires connected to the device-side connector.Type: GrantFiled: January 23, 2020Date of Patent: March 23, 2021Assignee: RICOH COMPANY, LTD.Inventors: Seiji Saitoh, Toshiharu Hachisuka, Hiroshi Seo, Yutaka Naitoh, Daisuke Inoue, Masao Katoh, Yutaka Aso, Naohiro Funada, Tomoo Asami, Jun Okamoto
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Publication number: 20200379384Abstract: A heating device includes a sleeve-shaped flexible fixing rotator, a heater to contact an inner surface of the fixing rotator, a pressure rotator pressed against the heater via the fixing rotator to form a nip between the fixing rotator and the pressure rotator, a thermometer to detect a temperature of the heater, and a pressing force switching mechanism to switch a pressing force between the heater and the pressure rotator. The pressing force switching mechanism switches the pressing force between the heater and the pressure rotator in at least two stages, a standard force when the temperature of the heater detected by the thermometer increases and reaches a predetermined temperature and before the medium to be heated passes through the nip, and a reduced force smaller than the standard force when the temperature of the heater detected by the thermometer is lower than the predetermined temperature.Type: ApplicationFiled: March 25, 2020Publication date: December 3, 2020Applicant: Ricoh Company, Ltd.Inventors: Masahiro SAMEI, Tomoya ADACHI, Yukimichi SOMEYA, Yuusuke FURUICHI, Hiroshi SEO
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Patent number: 10845740Abstract: A temperature detector for being positioned with respect to a counterpart includes a temperature detecting element that detects a temperature of a detecting target and a holding body that holds the temperature detecting element. A projecting engagement engages the counterpart and is mounted on the holding body.Type: GrantFiled: October 18, 2019Date of Patent: November 24, 2020Assignee: Ricoh Company, Ltd.Inventors: Yuusuke Furuichi, Hiroshi Seo, Yoshiki Yamaguchi
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Patent number: 10788775Abstract: A fixing device includes a fixing member, at least one temperature detector, and a device-side drawer connector. The at least one temperature detector is configured to detect a temperature of the fixing member, the at least one temperature detector including a plurality of lead wires. The device-side drawer connector has a terminal portion configured to fit with a terminal portion of a body-side drawer connector of an image forming apparatus body to connect the plurality of lead wires of the at least one temperature detector to the image forming apparatus body. The device-side drawer connector is configured to branch a signal wire of the plurality of lead wires of the at least one temperature detector into a plurality of systems. A plurality of earth wires of the plurality of lead wires of the at least one temperature detector is short-circuited to each other.Type: GrantFiled: January 27, 2020Date of Patent: September 29, 2020Assignee: RICOH COMPANY, LTD.Inventors: Jun Okamoto, Seiji Saitoh, Yutaka Naitoh, Toshiharu Hachisuka, Hiroshi Seo, Daisuke Inoue, Masao Katoh, Yutaka Aso, Naohiro Funada, Tomoo Asami
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Publication number: 20200241452Abstract: A fixing device includes at least one temperature detector and a device-side connector. The at least one temperature detector is configured to detect a temperature of the fixing device. The device-side connector is configured to transmit a temperature detection signal from the at least one temperature detector to an image forming apparatus body by mutual contact between a terminal of the device-side connector and a terminal of a body-side connector of the image forming apparatus body. A lead wire of the at least one temperature detector is branched into a plurality of wires connected to the device-side connector.Type: ApplicationFiled: January 23, 2020Publication date: July 30, 2020Applicant: Ricoh Company, Ltd.Inventors: Seiji SAITOH, Toshiharu HACHISUKA, Hiroshi SEO, Yutaka NAITOH, Daisuke INOUE, Masao KATOH, Yutaka ASO, Naohiro FUNADA, Tomoo ASAMI, Jun OKAMOTO
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Publication number: 20200241453Abstract: A fixing device includes a fixing member, at least one temperature detector, and a device-side drawer connector. The at least one temperature detector is configured to detect a temperature of the fixing member, the at least one temperature detector including a plurality of lead wires. The device-side drawer connector has a terminal portion configured to fit with a terminal portion of a body-side drawer connector of an image forming apparatus body to connect the plurality of lead wires of the at least one temperature detector to the image forming apparatus body. The device-side drawer connector is configured to branch a signal wire of the plurality of lead wires of the at least one temperature detector into a plurality of systems. A plurality of earth wires of the plurality of lead wires of the at least one temperature detector is short-circuited to each other.Type: ApplicationFiled: January 27, 2020Publication date: July 30, 2020Applicant: Ricoh Company, Ltd.Inventors: Jun OKAMOTO, Seiji SAITOH, Yutaka NAITOH, Toshiharu HACHISUKA, Hiroshi SEO, Daisuke INOUE, Masao KATOH, Yutaka ASO, Naohiro FUNADA, Tomoo ASAMI
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Publication number: 20200183307Abstract: A temperature detector for being positioned with respect to a counterpart includes a temperature detecting element that detects a temperature of a detecting target and a holding body that holds the temperature detecting element. A projecting engagement engages the counterpart and is mounted on the holding body.Type: ApplicationFiled: October 18, 2019Publication date: June 11, 2020Inventors: Yuusuke FURUICHI, Hiroshi SEO, Yoshiki YAMAGUCHI
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Patent number: 10162283Abstract: An image forming apparatus includes an exhaust duct to guide air inside the image forming apparatus to an outside of the image forming apparatus. A positive ion generator emits a positive ion into the exhaust duct. A negative ion generator emits a negative ion into the exhaust duct. The negative ion generator is shifted from the positive ion generator in one of an air flow direction of the air moving inside the exhaust duct and a direction perpendicular to the air flow direction.Type: GrantFiled: July 12, 2017Date of Patent: December 25, 2018Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Shimada, Toshiyuki Kabata, Takashi Fujita, Hiroshi Seo
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Patent number: 10001734Abstract: A fixing device includes an endless, rotatable fixing belt, a pressure rotator, a nip formation pad, a support, and a vibration repressor. The pressure rotator presses an outer surface of the fixing belt. The nip formation pad is disposed at an inner side of the fixing belt, to abut on the pressure rotator with the fixing belt interposed between the nip formation pad and the pressure rotator to form a fixing nip. The support is disposed at the inner side of the fixing belt, to support the nip formation pad. The vibration repressor is disposed between the nip formation pad and the support, to repress vibration of the nip formation pad.Type: GrantFiled: December 13, 2016Date of Patent: June 19, 2018Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Seo, Yuusuke Furuichi, Takashi Fujita, Daisuke Inoue, Takamasa Hase
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Publication number: 20180024462Abstract: An image forming apparatus includes an exhaust duct to guide air inside the image forming apparatus to an outside of the image forming apparatus. A positive ion generator emits a positive ion into the exhaust duct. A negative ion generator emits a negative ion into the exhaust duct. The negative ion generator is shifted from the positive ion generator in one of an air flow direction of the air moving inside the exhaust duct and a direction perpendicular to the air flow direction.Type: ApplicationFiled: July 12, 2017Publication date: January 25, 2018Inventors: Hiroyuki SHIMADA, Toshiyuki Kabata, Takashi Fujita, Hiroshi Seo
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Patent number: 9851663Abstract: A fixing device includes a primary heater disposed opposite a fixing rotator to heat a circumferential span of the fixing rotator other than a fixing nip formed between the fixing rotator and a pressure rotator and a secondary heater disposed outboard from the primary heater in an axial direction of the fixing rotator to heat the fixing rotator at the fixing nip. The primary heater and the secondary heater heat a bi-heating span of the fixing rotator in the axial direction thereof. The secondary heater heats a mono-heating span of the fixing rotator in the axial direction thereof and generates a decreased amount of heat to be conducted to the bi-heating span of the fixing rotator. The decreased amount of heat is smaller than an increased amount of heat to be conducted to the mono-heating span of the fixing rotator that is heated by the secondary heater only.Type: GrantFiled: May 2, 2016Date of Patent: December 26, 2017Assignee: Ricoh Company, Ltd.Inventors: Shohta Kobashigawa, Kenji Ishii, Kazuhito Kishi, Takayuki Seki, Hiroshi Yoshinaga, Takashi Seto, Hiromasa Takagi, Ippei Fujimoto, Hiroshi Seo, Takamasa Hase, Kazunari Sawada, Yasuhiko Ogino
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Patent number: 9829840Abstract: A fixing device includes a nip formation pad that presses against a pressure rotator via an endless belt to form a fixing nip between the belt and the pressure rotator, through which a recording medium bearing a toner image is conveyed. A fixing heater is disposed opposite at least a center span of a conveyance span of the belt in an axial direction thereof where the recording medium is conveyed to heat the belt. A first lateral end heater and a second lateral end heater are mounted on the nip formation pad and disposed opposite a first lateral end span and a second lateral end span of an inner circumferential surface of the belt in the axial direction thereof, respectively, to heat the belt. The second lateral end heater is electrically connected in series to the first lateral end heater.Type: GrantFiled: February 1, 2016Date of Patent: November 28, 2017Assignee: Ricoh Company, Ltd.Inventors: Takashi Seto, Kenji Ishii, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Kazuhito Kishi, Ippei Fujimoto, Kazunari Sawada, Hiroshi Yoshinaga, Hiromasa Takagi, Takamasa Hase, Hiroshi Seo