Patents by Inventor Keisuke Kubota
Keisuke Kubota 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: 20240074213Abstract: According to one embodiment, a memory device includes a first substrate and a second substrate. The first substrate is provided with a first circuit layer on a front surface. The first circuit layer includes a CMOS circuit. The second substrate has a front surface that faces the first substrate. The second substrate is provided with a second circuit layer on the front surface contacting the first circuit layer. The second substrate includes a memory circuit and transistors of a silicon-on-insulator (SOI) structure.Type: ApplicationFiled: July 27, 2023Publication date: February 29, 2024Inventors: Taichi IWASAKI, Keisuke KUBOTA
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Publication number: 20220333342Abstract: In the hydraulic excavator, the control unit outputs the drive signals, which gives the motion corresponding to the motion of the hydraulic cylinder, the revolving motor of the revolving unit and the traveling device to the work implement operating lever, the right work implement operating lever and the traveling lever, to the drive section. The control section outputs the control signals based on the motion of the left work implement operating lever the right work implement operating lever or the traveling lever operated by the operator when the motion of the left work implement operating lever, the right work implement operating lever or the traveling lever operated by the operator is different from the motion corresponding to the motion of the hydraulic cylinder, the revolving motor of the revolving unit and the traveling device.Type: ApplicationFiled: September 15, 2020Publication date: October 20, 2022Inventors: Masashi KATOH, Yuuki KOBAYASHI, Keisuke KUBOTA
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Publication number: 20220316179Abstract: A work vehicle includes an operating lever configured to operate a work implement, an actuator configured to move the operating lever, and a control section configured to control the actuator to move the operating lever to a retreat position outside an operation range of the operating lever.Type: ApplicationFiled: September 15, 2020Publication date: October 6, 2022Inventors: Masashi KATOH, Yuuki KOBAYASHI, Keisuke KUBOTA
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Publication number: 20220300025Abstract: A work vehicle includes a vehicle main body, a work implement attached to the vehicle main body, an operating lever configured to operate the work implement, an imparting section configured to impart force to the operating lever, an acceleration detection section configured to detect acceleration of the vehicle main body, and a control section configured to control the imparting section to automatically adjust a magnitude of the force imparted to the operating lever based on the acceleration detected by the acceleration detection section.Type: ApplicationFiled: September 9, 2020Publication date: September 22, 2022Inventors: Masashi KATOH, Yuuki KOBAYASHI, Keisuke KUBOTA
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Patent number: 10481530Abstract: A separation member that is used to separate a conveyance object from two rotation members, the conveyance object having been sent out from a nip that is formed by the two rotation members that are in contact with one another, the separation member includes a wavy part directed toward the nip and inclined from a normal to a center line of the two rotation members at a predetermined angle. The wavy part covers a contact zone where the conveyance object can come into contact with the separation member along a conveyance direction and along a width direction of the conveyance object, and the wavy part has a plurality of depressions parallel to each other and extending in a direction inclined from the conveyance direction and inclined from the width direction, at least two of the depressions overlapping along the conveyance direction.Type: GrantFiled: June 18, 2018Date of Patent: November 19, 2019Assignee: RICOH COMPANY, LTD.Inventors: Seiji Saitoh, Keisuke Kubota, Masami Okamoto, Kenji Nozawa, Fumihiro Hirose, Kensuke Yamaji, Shuutaroh Yuasa, Yuuki Kikushima, Kaori Hemmi, Yuuta Kanda
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Patent number: 10394169Abstract: A fixing device includes a tubular rotator and a first heater disposed inside the tubular rotator and extended in a longitudinal direction of the first heater. The first heater heats the tubular rotator. A second heater is disposed inside the tubular rotator and extended in a longitudinal direction of the second heater. The second heater heats the tubular rotator. A heating adjuster is interposed between the first heater and the second heater. The heating adjuster adjusts heat conduction from the first heater to the second heater. A joint combines the heating adjuster with the second heater.Type: GrantFiled: August 14, 2017Date of Patent: August 27, 2019Assignee: RICOH COMPANY, LTD.Inventors: Fumihiro Hirose, Keisuke Kubota, Masami Okamoto, Jun Ogino, Kensuke Yamaji, Shuutaroh Yuasa, Yuuta Kanda
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Publication number: 20180299809Abstract: A separation member that is used to separate a conveyance object from two rotation members, the conveyance object having been sent out from a nip that is formed by the two rotation members that are in contact with one another, the separation member includes a wavy part directed toward the nip and inclined from a normal to a center line of the two rotation members at a predetermined angle. The wavy part covers a contact zone where the conveyance object can come into contact with the separation member along a conveyance direction and along a width direction of the conveyance object, and the wavy part has a plurality of depressions parallel to each other and extending in a direction inclined from the conveyance direction and inclined from the width direction, at least two of the depressions overlapping along the conveyance direction.Type: ApplicationFiled: June 18, 2018Publication date: October 18, 2018Inventors: Seiji Saitoh, Keisuke Kubota, Masami Okamoto, Kenji Nozawa, Fumihiro Hirose, Kensuke Yamaji, Shuutaroh Yuasa, Yuuki Kikushima, Kaori Hemmi, Yuuta Kanda
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Patent number: 10095166Abstract: A fixing device includes a separator disposed downstream from a nip former in a recording medium conveyance direction and isolated from a pressure rotator via a fixing belt. The separator stretches the fixing belt. A presser is interposed between a fixing nip formed between the living belt and the pressure rotator and an upstream end of the separator in a rotation direction of the fixing belt. The presser comes into contact with an inner circumferential surface of the fixing belt to press the fixing belt against the pressure rotator. A pressure adjuster, contacting the pressure rotator, changes a pressing position of the pressure rotator relative to the fixing belt to adjust pressure exerted from the pressure rotator to the fixing belt. A presser position adjuster, contacting the presser, changes a presser position of the presser relative to the fixing belt according to the pressing position of the pressure rotator.Type: GrantFiled: May 23, 2017Date of Patent: October 9, 2018Assignee: Ricoh Company, Ltd.Inventors: Masami Okamoto, Keisuke Kubota, Seiji Saitoh, Shuutaroh Yuasa, Yuuta Kanda, Fumihiro Hirose, Kensuke Yamaji
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Patent number: 10088786Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A separator is disposed downstream from the nip former in a recording medium conveyance direction and stretches the fixing belt. The separator is spaced apart from the pressure rotator via the fixing belt. A presser is interposed between an exit of the fixing nip and an upstream end of the separator in the rotation direction of the fixing belt. The presser comes into contact with an inner circumferential surface of the fixing belt to press the fixing belt against the pressure rotator.Type: GrantFiled: February 28, 2017Date of Patent: October 2, 2018Assignee: RICOH COMPANY, LTD.Inventors: Keisuke Kubota, Seiji Saitoh, Masami Okamoto, Kensuke Yamaji, Fumihiro Hirose, Shuutaroh Yuasa, Yuuta Kanda
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Patent number: 10012936Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt and including an elastic layer as a surface layer. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in a recording medium conveyance direction. The presser brings the fixing belt into contact with the pressure rotator.Type: GrantFiled: March 2, 2017Date of Patent: July 3, 2018Assignee: Ricoh Company, Ltd.Inventors: Kensuke Yamaji, Keisuke Kubota, Seiji Saitoh, Masami Okamoto, Fumihiro Hirose, Shuutaroh Yuasa, Kenji Nozawa, Kaori Hemmi, Jun Ogino, Yuuta Kanda
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Patent number: 10012937Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in a recording medium conveyance direction. The presser brings the fixing belt into contact with the pressure rotator. A gap retainer contacts the nip former and is coupled to the presser to retain isolation of the presser from the nip former.Type: GrantFiled: March 8, 2017Date of Patent: July 3, 2018Assignee: Ricoh Company, Ltd.Inventors: Shuutaroh Yuasa, Keisuke Kubota, Masami Okamoto, Seiji Saitoh, Fumihiro Hirose, Kensuke Yamaji, Jun Ogino, Yuuta Kanda
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Patent number: 9996035Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in the rotation direction of the fixing belt. The presser brings the fixing belt into contact with the pressure rotator. A mover is coupled to the presser to move the presser between a contact position where the presser brings the fixing belt into contact with the pressure rotator and an isolation position where the presser isolates the fixing belt from the pressure rotator.Type: GrantFiled: March 2, 2017Date of Patent: June 12, 2018Assignee: Ricoh Company, Ltd.Inventors: Masami Okamoto, Seiji Saitoh, Keisuke Kubota, Shuutaroh Yuasa, Kensuke Yamaji, Fumihiro Hirose, Yuuta Kanda
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Patent number: 9939761Abstract: A fixing device includes an endless fixing belt stretched taut across a first roller and a second roller and rotatable in a predetermined direction of rotation. A pressure rotator is pressed against the first roller via the fixing belt to form a fixing nip between the pressure rotator and the fixing belt, through which a recording medium is conveyed. A separation aid, disposed downstream from the fixing nip in the direction of rotation of the fixing belt to separate the recording medium from the fixing belt, includes a contact face contacting an inner circumferential surface of the fixing belt and a bulge disposed at a center of the contact face in a longitudinal direction of the separation aid. The bulge projects toward the inner circumferential surface of the fixing belt relative to each lateral end of the contact face in the longitudinal direction of the separation aid.Type: GrantFiled: October 27, 2015Date of Patent: April 10, 2018Assignee: Ricoh Company, Ltd.Inventors: Kenji Nozawa, Masahiko Satoh, Masami Okamoto, Keisuke Kubota, Yuuki Kikushima, Shuutaroh Yuasa, Fumihiro Hirose, Kensuke Yamaji, Kaori Hemmi
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Publication number: 20180081309Abstract: A fixing device includes a tubular rotator and a first heater disposed inside the tubular rotator and extended in a longitudinal direction of the first heater. The first heater heats the tubular rotator. A second heater is disposed inside the tubular rotator and extended in a longitudinal direction of the second heater. The second heater heats the tubular rotator. A heating adjuster is interposed between the first heater and the second heater. The heating adjuster adjusts heat conduction from the first heater to the second heater. A joint combines the heating adjuster with the second heater.Type: ApplicationFiled: August 14, 2017Publication date: March 22, 2018Inventors: Fumihiro HIROSE, Keisuke KUBOTA, Masami OKAMOTO, Jun OGINO, Kensuke YAMAJI, Shuutaroh YUASA, Yuuta KANDA
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Publication number: 20170357197Abstract: A fixing device includes a separator disposed downstream from a nip former in a recording medium conveyance direction and isolated from a pressure rotator via a fixing belt. The separator stretches the fixing belt. A presser is interposed between a fixing nip formed between the living belt and the pressure rotator and an upstream end of the separator in a rotation direction of the fixing belt. The presser comes into contact with an inner circumferential surface of the fixing belt to press the fixing belt against the pressure rotator. A pressure adjuster, contacting the pressure rotator, changes a pressing position of the pressure rotator relative to the fixing belt to adjust pressure exerted from the pressure rotator to the fixing belt. A presser position adjuster, contacting the presser, changes a presser position of the presser relative to the fixing belt according to the pressing position of the pressure rotator.Type: ApplicationFiled: May 23, 2017Publication date: December 14, 2017Inventors: Masami OKAMOTO, Keisuke Kubota, Seiji Saitoh, Shuutaroh Yuasa, Yuuta Kanda, Fumihiro Hirose, Kensuke Yamaji
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Patent number: 9811034Abstract: An image forming apparatus includes an image forming device that forms an image on a sheet, a fixing device including a fixing member that fixes the image formed on the sheet and a polishing device that polishes a surface of the fixing member, and circuitry that determines whether an interruption required operation is to be performed, at a time while image formation is being performed by the image forming device to execute an image forming job, or at a time after image formation is executed for one job and before image formation is to be executed for a subsequent job, controls the image forming device to stop image formation to perform the interruption required operation, based on a determination indicating that the interruption required operation is to be performed, and controls the polishing device to polish the surface of the fixing member concurrently with the interruption required operation.Type: GrantFiled: August 2, 2016Date of Patent: November 7, 2017Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Kawabe, Kaori Hemmi, Keisuke Kubota
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Publication number: 20170269526Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in a recording medium conveyance direction. The presser brings the fixing belt into contact with the pressure rotator. A gap retainer contacts the nip former and is coupled to the presser to retain isolation of the presser from the nip former.Type: ApplicationFiled: March 8, 2017Publication date: September 21, 2017Inventors: Shuutaroh YUASA, Keisuke Kubota, Masami Okamoto, Seiji Saitoh, Fumihiro Hirose, Kensuke Yamaji, Jun Ogino, Yuuta Kanda
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Publication number: 20170269522Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A separator is disposed downstream from the nip former in a recording medium conveyance direction and stretches the fixing belt. The separator is spaced apart from the pressure rotator via the fixing belt. A presser is interposed between an exit of the fixing nip and an upstream end of the separator in the rotation direction of the fixing belt. The presser comes into contact with an inner circumferential surface of the fixing belt to press the fixing belt against the pressure rotator.Type: ApplicationFiled: February 28, 2017Publication date: September 21, 2017Applicant: Ricoh Company, Ltd.Inventors: Keisuke KUBOTA, Seiji SAITOH, Masami OKAMOTO, Kensuke YAMAJI, Fumihiro HIROSE, Shuutaroh YUASA, Yuuta KANDA
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Publication number: 20170269524Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt and including an elastic layer as a surface layer. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in a recording medium conveyance direction. The presser brings the fixing belt into contact with the pressure rotator.Type: ApplicationFiled: March 2, 2017Publication date: September 21, 2017Inventors: Kensuke YAMAJI, Keisuke KUBOTA, Seiji SAITOH, Masami OKAMOTO, Fumihiro HIROSE, Shuutaroh YUASA, Kenji NOZAWA, Kaori HEMMI, Jun OGINO, Yuuta KANDA
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Publication number: 20170269525Abstract: A fixing device includes a fixing belt that is endless and rotatable in a rotation direction and a nip former stretching the fixing belt. A pressure rotator presses against the nip former via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium is conveyed. A presser is disposed downstream from an exit of the fixing nip in the rotation direction of the fixing belt. The presser brings the fixing belt into contact with the pressure rotator. A mover is coupled to the presser to move the presser between a contact position where the presser brings the fixing belt into contact with the pressure rotator and an isolation position where the presser isolates the fixing belt from the pressure rotator.Type: ApplicationFiled: March 2, 2017Publication date: September 21, 2017Inventors: Masami OKAMOTO, Seiji SAITOH, Keisuke KUBOTA, Shuutaroh YUASA, Kensuke YAMAJI, Fumihiro HIROSE, Yuuta KANDA