Patents by Inventor Shizuma Nishimura
Shizuma Nishimura 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: 20230324834Abstract: A flange member is adapted such that a first distance between a first position at which a part thereof on an upstream side in a recording material conveyance direction comes into contact with a film inner surface and a nip center that is an intersection of a first virtual line and a second virtual line is longer than a second distance between a second position at which a region of an outer surface of the flange member facing the film inner surface intersects the first virtual line and the nip center, and a film guide is adapted such that a third distance between a third position that faces the film inner surface on the upstream side and the nip center is longer than a fourth distance between a fourth position that faces the film inner surface on the downstream side and the nip center on the first virtual line.Type: ApplicationFiled: April 10, 2023Publication date: October 12, 2023Inventors: SHIZUMA NISHIMURA, TAKASHI HONKE
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Patent number: 11609519Abstract: An image heating device heats up an image formed on a recording material, the device having: a heating member provided with a heater having a plurality of heating elements juxtaposed in a direction perpendicular to a conveyance direction of the recording material; a roller, such that the circumference of the roller increases from a central portion towards ends portions, in a direction perpendicular to the conveyance direction; and a control portion that controls individually the power supplied to the plurality of heating elements. The control portion sets a control target temperature, being set in order to supply power to a heating element corresponding to a non-sheet passing area, from among the plurality of heating elements, to be higher than a lowest control target temperature from among control target temperatures that are set in order to supply power to a heating element corresponding to a sheet passing area.Type: GrantFiled: December 21, 2021Date of Patent: March 21, 2023Assignee: Canon Kabushiki KaishaInventor: Shizuma Nishimura
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Patent number: 11454926Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: GrantFiled: September 21, 2021Date of Patent: September 27, 2022Assignee: Canon Kabushiki KaishaInventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Publication number: 20220206416Abstract: An image heating device heats up an image formed on a recording material, the device having: a heating member provided with a heater having a plurality of heating elements juxtaposed in a direction perpendicular to a conveyance direction of the recording material; a roller, such that the circumference of the roller increases from a central portion towards ends portions, in a direction perpendicular to the conveyance direction; and a control portion that controls individually the power supplied to the plurality of heating elements. The control portion sets a control target temperature, being set in order to supply power to a heating element corresponding to a non-sheet passing area, from among the plurality of heating elements, to be higher than a lowest control target temperature from among control target temperatures that are set in order to supply power to a heating element corresponding to a sheet passing area.Type: ApplicationFiled: December 21, 2021Publication date: June 30, 2022Inventor: Shizuma Nishimura
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Patent number: 11300912Abstract: An image forming apparatus includes: an image forming unit configured to form an image on a sheet based on original image data; a selection unit configured to determine a non-image region of the sheet to which toner does not attach in a formation of the image by the image forming unit based on the original image data, and select, from the non-image region, a determination region depending on an image defect to be detected; a reading unit configured to read a surface of the sheet; and a control unit configured to obtain read image data by causing the reading unit to read the determination region after the image forming unit has formed the image, and perform detection processing for detecting whether the image defect has occurred based on the read image data.Type: GrantFiled: July 1, 2021Date of Patent: April 12, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Shizuma Nishimura, Koji Nihonyanagi
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Publication number: 20220011706Abstract: An image forming apparatus includes: an image forming unit configured to form an image on a sheet based on original image data; a selection unit configured to determine a non-image region of the sheet to which toner does not attach in a formation of the image by the image forming unit based on the original image data, and select, from the non-image region, a determination region depending on an image defect to be detected; a reading unit configured to read a surface of the sheet; and a control unit configured to obtain read image data by causing the reading unit to read the determination region after the image forming unit has formed the image, and perform detection processing for detecting whether the image defect has occurred based on the read image data.Type: ApplicationFiled: July 1, 2021Publication date: January 13, 2022Inventors: Shizuma Nishimura, Koji Nihonyanagi
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Publication number: 20220004145Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: ApplicationFiled: September 21, 2021Publication date: January 6, 2022Inventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Patent number: 11156958Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: GrantFiled: July 15, 2020Date of Patent: October 26, 2021Assignee: Canon Kabushiki KaishaInventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Publication number: 20200348624Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: ApplicationFiled: July 15, 2020Publication date: November 5, 2020Inventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Patent number: 10754294Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: GrantFiled: July 16, 2019Date of Patent: August 25, 2020Assignee: Canon Kabushiki KaishaInventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Publication number: 20200041955Abstract: A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.Type: ApplicationFiled: July 16, 2019Publication date: February 6, 2020Inventors: Tomoaki Nakai, Shizuma Nishimura, Masaki Shimomura
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Patent number: 10185256Abstract: An image forming apparatus for forming a toner image on a sheet includes a main assembly, an image forming station provided in the main assembly and configured to form a toner image on the sheet, and a fixing portion provided in the main assembly and configured to fix the toner image formed on the sheet, on the sheet, the fixing portion including a fixing rotatable member and a covering member covering the rotatable member. The image forming apparatus also includes a suction mechanism including a duct connected with an opening provided in the covering member, and a fan configured to suck air inside the covering member through the duct. The air sucked by the suction mechanism is discharged into a space in the main assembly other than a space through which the sheet passes.Type: GrantFiled: September 25, 2017Date of Patent: January 22, 2019Assignee: Canon Kabushiki KaishaInventors: Seiji Inada, Seiji Obata, Shizuma Nishimura, Michio Uchida, Yoji Oya
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Publication number: 20180088499Abstract: An image forming apparatus for forming a toner image on a sheet, the image forming apparatus includes a main assembly; an image forming station provided in the main assembly and configured to form a toner image on the sheet; a fixing portion provided in the main assembly and configured to fix the toner image formed on the sheet, on the sheet, the fixing portion including a fixing rotatable member and a covering member covering the rotatable member; and a suction mechanism including a duct connected with an opening provided in the covering member and a fan configured to suck air inside the covering member through the duct, wherein the air sucked by the suction mechanism is discharged into a space in the main assembly other than a space through which the sheet passes.Type: ApplicationFiled: September 25, 2017Publication date: March 29, 2018Inventors: Seiji Inada, Seiji Obata, Shizuma Nishimura, Michio Uchida, Yoji Oya
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Patent number: 9910391Abstract: An image heating apparatus for heating an image formed on a recording material includes a tubular rotary member including a conductive layer, a magnetic core inserted into a hollow portion of the rotary member, a coil helically wound around an outer side of the magnetic core in the hollow portion, and a control unit configured to control a frequency of an alternating current flowing through the coil, in which the conductive layer generates heat by an electromagnetic induction in an alternating magnetic field formed when the alternating current flows through the coil, and the control unit controls the frequency in accordance with a size of the recording material.Type: GrantFiled: December 10, 2014Date of Patent: March 6, 2018Assignee: Canon Kabushiki KaishaInventors: Yuki Nishizawa, Shizuma Nishimura, Shinji Hashiguchi, Koji Uchiyama, Mahito Yoshioka, Hiroshi Kita, Akira Kuroda
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Patent number: 9658584Abstract: A fixing apparatus for fixing a toner image on a recording material while conveying and heating, at a nip portion, the recoding material on which the toner image has been formed, the fixing apparatus including a rotary member including a conductive layer, a helical coil provided inside the rotary member, a helical axis of the helical coil extending in a generatrix direction of the rotary member, a magnetic core provided inside the helical coil, the magnetic core having a shape that does not form a loop outside the conductive layer, and a back-up member forming a nip portion together with the rotary member. In the generatrix direction, when winding pitches of the helical coil in a middle area, in end-portion areas, and in intermediate areas that are areas between the middle area and the end-portion areas are X, Y, and Z, respectively, then Y<X<Z is satisfied.Type: GrantFiled: June 14, 2016Date of Patent: May 23, 2017Assignee: Canon Kabushiki KaishaInventor: Shizuma Nishimura
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Publication number: 20160370743Abstract: A fixing apparatus for fixing a toner image on a recording material while conveying and heating, at a nip portion, the recoding material on which the toner image has been formed, the fixing apparatus including a rotary member including a conductive layer, a helical coil provided inside the rotary member, a helical axis of the helical coil extending in a generatrix direction of the rotary member, a magnetic core provided inside the helical coil, the magnetic core having a shape that does not form a loop outside the conductive layer, and a back-up member forming a nip portion together with the rotary member. In the generatrix direction, when winding pitches of the helical coil in a middle area, in end-portion areas, and in intermediate areas that are areas between the middle area and the end-portion areas are X, Y, and Z, respectively, then Y<X<Z is satisfied.Type: ApplicationFiled: June 14, 2016Publication date: December 22, 2016Inventor: Shizuma Nishimura
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Publication number: 20160313683Abstract: An image heating apparatus for heating an image formed on a recording material includes a tubular rotary member including a conductive layer, a magnetic core inserted into a hollow portion of the rotary member, a coil helically wound around an outer side of the magnetic core in the hollow portion, and a control unit configured to control a frequency of an alternating current flowing through the coil, in which the conductive layer generates heat by an electromagnetic induction in an alternating magnetic field formed when the alternating current flows through the coil, and the control unit controls the frequency in accordance with a size of the recording material.Type: ApplicationFiled: December 10, 2014Publication date: October 27, 2016Applicant: Canon Kabushiki KaishaInventors: Yuki Nishizawa, Shizuma Nishimura, Shinji Hashiguchi, Koji Uchiyama, Mahito Yoshioka, Hiroshi Kita, Akira Kuroda
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Patent number: 9405249Abstract: A fixing device includes: a rotatable member including an electroconductive layer; a helical coil having a helical axis direction along a generatrix direction of the rotatable member; a magnetic member not forming a loop outside the electroconductive layer; a frequency setting portion for setting a frequency of an AC current caused to flow through the coil; and a temperature detecting portion for detecting a temperature of the rotatable member, including a first temperature detecting member and a second temperature detecting member. The electroconductive layer generates heat through electromagnetic induction heating by magnetic flux resulting from the AC current, and an image is fixed on a recording material by heat of the rotatable member. The frequency setting portion sets the frequency depending on a value of a difference between a detection temperature of the first temperature detecting member and a detection temperature of the second temperature detecting member.Type: GrantFiled: July 17, 2015Date of Patent: August 2, 2016Assignee: Canon Kabushiki KaishaInventors: Masahide Hirai, Munehito Kurata, Shinji Hashiguchi, Shizuma Nishimura, Michio Uchida, Hisahiro Saito
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Patent number: 9310731Abstract: An image heating apparatus, to heat an image formed on a recording material includes a cylindrical rotatable member having a conductive layer, a coil having a helically shaped portion which is helically wound in a generatrix direction of the rotatable member inside the rotatable member, and a magnetic core disposed inside the helically shaped portion. The coil, which includes a number of turns, produces an alternating magnetic field to cause the conductive layer to generate heat by electromagnetic induction. The magnetic core includes a plurality of divided cores into which the magnetic core is divided in the generatrix direction. The number of turns of the coil per unit length, at a region that corresponds to a boundary between the plurality of divided cores, is larger than the number of turns of the coil at a region that corresponds to the plurality of divided cores.Type: GrantFiled: September 15, 2015Date of Patent: April 12, 2016Assignee: Canon Kabushiki KaishaInventors: Hideaki Yonekubo, Tomonori Sato, Shizuma Nishimura
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Publication number: 20160026132Abstract: A fixing device includes: a rotatable member including an electroconductive layer; a helical coil having a helical axis direction along a generatrix direction of said rotatable member; a magnetic member not forming a loop outside the electroconductive layer; a frequency setting portion for setting a frequency of an AC current caused to flow through said coil; and a temperature detecting portion for detecting a temperature of said rotatable member, including a first temperature detecting member and a second temperature detecting member. The electroconductive layer generates heat through electromagnetic induction heating by magnetic flux resulting from the AC current, and an image is fixed on a recording material by heat of said rotatable member. The frequency setting portion sets the frequency depending on a value of a difference between a detection temperature of said first temperature detecting member and a detection temperature of said second temperature detecting member.Type: ApplicationFiled: July 17, 2015Publication date: January 28, 2016Inventors: Masahide Hirai, Munehito Kurata, Shinji Hashiguchi, Shizuma Nishimura, Michio Uchida, Hisahiro Saito