Patents by Inventor Kensuke Umeda
Kensuke Umeda 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: 20200209800Abstract: An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.Type: ApplicationFiled: March 11, 2020Publication date: July 2, 2020Inventors: Ai Suzuki, Masashi Tanaka, Shoichiro Ikegami, Kensuke Umeda, Sho Taguchi
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Patent number: 10642199Abstract: An image forming apparatus fixes a toner image on a transfer material at a fixing portion by applying an AC voltage from an AC power source to a fixing unit and includes a conductive pre-transfer guide on a position at which the transfer material nipped by a transfer portion and the fixing portion is in contact therewith. A capacitor and a Zener diode which is connected to the capacitor in parallel and maintains the pre-transfer guide at a predetermined voltage in a state in which a toner image is transferred to the transfer material nipped by the fixing portion and the transfer portion are arranged between the pre-transfer guide and the ground.Type: GrantFiled: October 30, 2018Date of Patent: May 5, 2020Assignee: Canon Kabushiki KaishaInventors: Kensuke Umeda, Shinsuke Kobayashi, Ai Suzuki
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Patent number: 10627768Abstract: An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.Type: GrantFiled: April 25, 2017Date of Patent: April 21, 2020Assignee: Canon Kabushiki KaishaInventors: Ai Suzuki, Masashi Tanaka, Shoichiro Ikegami, Kensuke Umeda, Sho Taguchi
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Patent number: 10564579Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.Type: GrantFiled: September 5, 2018Date of Patent: February 18, 2020Assignee: Canon Kabushiki KaishaInventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
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Patent number: 10488795Abstract: A fixing device includes a belt, a heater, and a pressing member for forming a nip through the belt in cooperation with the heater. The nip includes a region at which a width of the nip with respect to a feeding direction of a recording material gradually increases from a longitudinal central portion toward a longitudinal end portion, and a pressure of the nip gradually increases from the longitudinal central portion toward the longitudinal end portion. A heat-conductive member includes a regulating portion for regulating movement thereof relative to a supporting member in a longitudinal direction of the heater. The regulating portion is provided in a region of the heat-conductive member corresponding to a position of the nip closer to the longitudinal end portion than to the longitudinal central portion, and a bias member is provided outside of the region of the heat-conductive member corresponding to the position of the nip.Type: GrantFiled: October 7, 2016Date of Patent: November 26, 2019Assignee: Canon Kabushiki KaishaInventors: Masashi Tanaka, Shoichiro Ikegami, Kensuke Umeda, Sho Taguchi, Ai Suzuki
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Patent number: 10429777Abstract: A fixing apparatus includes a tubular film, an elongate heater, a roller, and a lubricant interposed between the heater and the film. A temperature detecting member detects a temperature of the heater, a controller controls electrical power supplied to the heater so that a temperature detected by the temperature detecting member reaches a target temperature, and a guide member guides the film. The guide member has a plurality of protrusions protruding toward the inner surface of the film. In a longitudinal direction of the guide member, a first region of the guide member corresponds to the temperature detecting member, and a second region of the guide member does not correspond to the temperature detecting member. In addition, a width of one protrusion located at the first region is greater than a width of some of the plurality protrusions located at the second region.Type: GrantFiled: August 10, 2018Date of Patent: October 1, 2019Assignee: Canon Kabushiki KaishaInventors: Kensuke Umeda, Masashi Tanaka
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Publication number: 20190137909Abstract: An image forming apparatus fixes a toner image on a transfer material at a fixing portion by applying an AC voltage from an AC power source to a fixing unit and includes a conductive pre-transfer guide on a position at which the transfer material nipped by a transfer portion and the fixing portion is in contact therewith. A capacitor and a Zener diode which is connected to the capacitor in parallel and maintains the pre-transfer guide at a predetermined voltage in a state in which a toner image is transferred to the transfer material nipped by the fixing portion and the transfer portion are arranged between the pre-transfer guide and the ground.Type: ApplicationFiled: October 30, 2018Publication date: May 9, 2019Inventors: Kensuke Umeda, Shinsuke Kobayashi, Ai Suzuki
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Publication number: 20190004460Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.Type: ApplicationFiled: September 5, 2018Publication date: January 3, 2019Inventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
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Publication number: 20180348677Abstract: A fixing apparatus includes a tubular film, an elongate heater, a roller, and a lubricant interposed between the heater and the film. A temperature detecting member detects a temperature of the heater, a controller controls electrical power supplied to the heater so that a temperature detected by the temperature detecting member reaches a target temperature, and a guide member guides the film. The guide member has a plurality of protrusions protruding toward the inner surface of the film. In a longitudinal direction of the guide member, a first region of the guide member corresponds to the temperature detecting member, and a second region of the guide member does not correspond to the temperature detecting member. In addition, a width of one protrusion located at the first region is greater than a width of some of the plurality protrusions located at the second region.Type: ApplicationFiled: August 10, 2018Publication date: December 6, 2018Inventors: Kensuke Umeda, Masashi Tanaka
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Patent number: 10120308Abstract: An image heating device includes a rotator, a heater including a heat generating resistor, a connector electrically connected to the heater, and a power interrupting unit that detects an abnormal temperature rise of the heater and interrupt supply of the power to the heater. The power interrupting unit includes a first terminal and a second terminal, a first conductive sheet metal that electrically connects the connector to the first terminal, a second conductive sheet metal that to electrically connects the connector to the second terminal via the heat generating resistor, a length of the second conductive sheet metal being different from a length of the first conductive sheet metal in the longitudinal direction of the heater, and a supporting member supporting the heater and including a regulation portion that regulates rotation of the power interrupting unit.Type: GrantFiled: July 11, 2017Date of Patent: November 6, 2018Assignee: Canon Kabushiki KaishaInventors: Takaaki Akamatsu, Masashi Tanaka, Kensuke Umeda, Shoichiro Ikegami, Sho Taguchi, Ai Suzuki
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Patent number: 10095165Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.Type: GrantFiled: October 17, 2016Date of Patent: October 9, 2018Assignee: Canon Kabushiki KaishaInventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
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Patent number: 10067447Abstract: A first region of a guide surface of a guide member, being in contact with an inner surface of a film on an upstream side of a heater in a rotation direction of the film, has a higher percentage of the protrusions per unit length in a longitudinal direction of the guide member than a second region of the guide surface, and the first and second regions are a region of the guide surface that overlaps a temperature detecting member and a region of the guide surface that does not overlap the temperature detecting member, respectively, in the longitudinal direction of the guide member.Type: GrantFiled: January 27, 2017Date of Patent: September 4, 2018Assignee: Canon Kabushiki KaishaInventors: Kensuke Umeda, Masashi Tanaka
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Publication number: 20180024481Abstract: A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.Type: ApplicationFiled: July 14, 2017Publication date: January 25, 2018Inventors: Kensuke Umeda, Masashi Tanaka, Shoichiro Ikegami, Sho Taguchi, Ai Suzuki, Hikaru Osada, Toru Imaizumi
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Publication number: 20180024478Abstract: An image heating device includes a rotator, a heater including a heat generating resistor, a connector electrically connected to the heater, and a power interrupting unit that detects an abnormal temperature rise of the heater and interrupt supply of the power to the heater. The power interrupting unit includes a first terminal and a second terminal, a first conductive sheet metal that electrically connects the connector to the first terminal, a second conductive sheet metal that to electrically connects the connector to the second terminal via the heat generating resistor, a length of the second conductive sheet metal being different from a length of the first conductive sheet metal in the longitudinal direction of the heater, and a supporting member supporting the heater and including a regulation portion that regulates rotation of the power interrupting unit.Type: ApplicationFiled: July 11, 2017Publication date: January 25, 2018Inventors: Takaaki Akamatsu, Masashi Tanaka, Kensuke Umeda, Shoichiro Ikegami, Sho Taguchi, Ai Suzuki
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Publication number: 20170308025Abstract: An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.Type: ApplicationFiled: April 25, 2017Publication date: October 26, 2017Inventors: Ai Suzuki, Masashi Tanaka, Shoichiro Ikegami, Kensuke Umeda, Sho Taguchi
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Publication number: 20170219969Abstract: A first region of a guide surface of a guide member, being in contact with an inner surface of a film on an upstream side of a heater in a rotation direction of the film, has a higher percentage of the protrusions per unit length in a longitudinal direction of the guide member than a second region of the guide surface, and the first and second regions are a region of the guide surface that overlaps a temperature detecting member and a region of the guide surface that does not overlap the temperature detecting member, respectively, in the longitudinal direction of the guide member.Type: ApplicationFiled: January 27, 2017Publication date: August 3, 2017Inventors: Kensuke Umeda, Masashi Tanaka
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Publication number: 20170102651Abstract: A fixing device includes a cylindrical belt; a heater including an elongated substrate and a heat generating resistor provided on the substrate; a heat-conductive member contacting a surface of the heater opposite from a belt contacting surface of the heater, and having thermal conductivity higher than that of the substrate; a supporting member; and a pressing member. The nip includes a region where a width of the nip with respect to a feeding direction of the recording material gradually increases from a longitudinal central portion toward a longitudinal end portion. The heat-conductive member includes a preventing portion for preventing movement thereof relative to the supporting member in a longitudinal direction of the heater. The preventing portion is provided in a region of the heat-conductive member corresponding to a position of the nip closer to the longitudinal end portion than to the longitudinal central portion.Type: ApplicationFiled: October 7, 2016Publication date: April 13, 2017Inventors: Masashi Tanaka, Shoichiro Ikegami, Kensuke Umeda, Sho Taguchi, Ai Suzuki
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Publication number: 20170031284Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.Type: ApplicationFiled: October 17, 2016Publication date: February 2, 2017Inventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
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Patent number: 9501012Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.Type: GrantFiled: September 29, 2015Date of Patent: November 22, 2016Assignee: Canon Kabushiki KaishaInventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
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Patent number: 9335688Abstract: An image forming apparatus includes an image forming portion; and a fixing portion. The fixing portion includes a cylindrical film, a nip-forming member and a roller including a shaft portion and an elastic layer. The elastic layer contacts an outer surface of the film except an end region of the film with respect to a generatrix direction. In the end region, the shaft portion and the outer surface of the film oppose each other with a spatial region with respect to a radial direction of the shaft portion. The image forming apparatus includes a spacer occupying at least a part of the spatial region.Type: GrantFiled: October 26, 2015Date of Patent: May 10, 2016Assignee: Canon Kabushiki KaishaInventors: Takanori Mitani, Satoshi Nishida, Hideo Nanataki, Akimichi Suzuki, Shogo Kan, Kensuke Umeda, Takaaki Akamatsu