Patents by Inventor Kazufumi Ishida
Kazufumi Ishida 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: 11340541Abstract: An image forming apparatus includes an image carrier, an exposure device, a developing device, a primary transfer device, a secondary transfer device, and a control unit. The exposure device exposes the image carrier to form an electrostatic latent image on the image carrier. The developing device forms a toner image by developing the electrostatic latent image using toner. The primary transfer device primarily transfers the toner image to a transfer body. The secondary transfer device applies a transfer bias to secondarily transfer the toner image to a recording medium. The control unit applies a cleaning bias to the secondary transfer device to remove residual toner after the secondary transfer. When the control unit determines that the toner image based on the exposed electrostatic latent image is not secondarily transferred at a predetermined timing, the first cleaning processing is performed until the subsequent processing is started.Type: GrantFiled: February 24, 2021Date of Patent: May 24, 2022Assignee: TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi Ishida, Ken Iguchi
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Publication number: 20210181657Abstract: An image forming apparatus includes an image carrier, an exposure device, a developing device, a primary transfer device, a secondary transfer device, and a control unit. The exposure device exposes the image carrier to form an electrostatic latent image on the image carrier. The developing device forms a toner image by developing the electrostatic latent image using toner. The primary transfer device primarily transfers the toner image to a transfer body. The secondary transfer device applies a transfer bias to secondarily transfer the toner image to a recording medium. The control unit applies a cleaning bias to the secondary transfer device to remove residual toner after the secondary transfer. When the control unit determines that the toner image based on the exposed electrostatic latent image is not secondarily transferred at a predetermined timing, the first cleaning processing is performed until the subsequent processing is started.Type: ApplicationFiled: February 24, 2021Publication date: June 17, 2021Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi ISHIDA, Ken IGUCHI
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Patent number: 10962907Abstract: An image forming apparatus includes an image carrier, an exposure device, a developing device, a primary transfer device, a secondary transfer device, and a control unit. The exposure device exposes the image carrier to form an electrostatic latent image on the image carrier. The developing device forms a toner image by developing the electrostatic latent image using toner. The primary transfer device primarily transfers the toner image to a transfer body. The secondary transfer device applies a transfer bias to secondarily transfer the toner image to a recording medium. The control unit applies a cleaning bias to the secondary transfer device to remove residual toner after the secondary transfer. When the control unit determines that the toner image based on the exposed electrostatic latent image is not secondarily transferred at a predetermined timing, the first cleaning processing is performed until the subsequent processing is started.Type: GrantFiled: September 12, 2019Date of Patent: March 30, 2021Assignee: TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi Ishida, Ken Iguchi
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Publication number: 20210080876Abstract: An image forming apparatus includes an image carrier, an exposure device, a developing device, a primary transfer device, a secondary transfer device, and a control unit. The exposure device exposes the image carrier to form an electrostatic latent image on the image carrier. The developing device forms a toner image by developing the electrostatic latent image using toner. The primary transfer device primarily transfers the toner image to a transfer body. The secondary transfer device applies a transfer bias to secondarily transfer the toner image to a recording medium. The control unit applies a cleaning bias to the secondary transfer device to remove residual toner after the secondary transfer. When the control unit determines that the toner image based on the exposed electrostatic latent image is not secondarily transferred at a predetermined timing, the first cleaning processing is performed until the subsequent processing is started.Type: ApplicationFiled: September 12, 2019Publication date: March 18, 2021Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi Ishida, Ken Iguchi
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Patent number: 10761471Abstract: An image forming apparatus includes an image carrier, a transfer member, and a light source. The image carrier has a photoconductive layer on a surface of the image carrier. The transfer member is configured to cause a toner image formed on the surface of the image carrier to be transferred to a transferee member at a transfer position of the image carrier. The light source is configured to emit light toward the surface of the image carrier after transfer of the toner image to remove residual charges on the photoconductive layer. An effective light receiving width of the image carrier in a width direction thereof is less than a width of the transfer member.Type: GrantFiled: August 8, 2019Date of Patent: September 1, 2020Assignee: TOSHIBA TEC KABUSHIKI KAISHAInventor: Kazufumi Ishida
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Publication number: 20200064770Abstract: An image forming apparatus includes an image carrier, a transfer member, and a light source. The image carrier has a photoconductive layer on a surface of the image carrier. The transfer member is configured to cause a toner image formed on the surface of the image carrier to be transferred to a transferee member at a transfer position of the image carrier. The light source is configured to emit light toward the surface of the image carrier after transfer of the toner image to remove residual charges on the photoconductive layer. An effective light receiving width of the image carrier in a width direction thereof is less than a width of the transfer member.Type: ApplicationFiled: August 8, 2019Publication date: February 27, 2020Inventor: Kazufumi ISHIDA
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Patent number: 10209647Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.Type: GrantFiled: December 12, 2017Date of Patent: February 19, 2019Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Sunao Takenaka, Suguru Kurita, Koichiro Sato, Koji Takahashi, Kazufumi Ishida, Yoshiki Kogiso, Takehiro Meguro
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Publication number: 20180299817Abstract: An image forming apparatus includes a toner image forming section, a transfer section, a fixing section and a guide. The toner image forming section forms a toner image on an image carrier. The transfer section transfers the toner image onto a sheet. The fixing section is arranged at a downstream side in a sheet conveyance direction with respect to the transfer section. The fixing section fixes the toner image on the sheet. The guide is arranged between the transfer section and the fixing section in the sheet conveyance direction. The guide regulates the sheet conveyance direction towards the fixing section. The downstream end of the guide in the sheet conveyance direction has a shape of being curved or inclined in a direction different from the sheet conveyance direction.Type: ApplicationFiled: August 25, 2017Publication date: October 18, 2018Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Kazufumi ISHIDA
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Publication number: 20180203398Abstract: An image forming apparatus includes an image forming section, a sheet supply section, and first and second curl correction mechanisms disposed in a sheet conveyance path between the sheet supply section and the image forming section and configured to curve a recording medium conveyed thereto. The first and second curl correction mechanisms are configured to apply curves to the recording medium in different curvature directions.Type: ApplicationFiled: July 19, 2017Publication date: July 19, 2018Inventor: Kazufumi ISHIDA
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Publication number: 20180101112Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.Type: ApplicationFiled: December 12, 2017Publication date: April 12, 2018Inventors: Sunao Takenaka, Suguru Kurita, Koichiro Sato, Koji Takahashi, Kazufumi Ishida, Yoshiki Kogiso, Takehiro Meguro
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Patent number: 9891559Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.Type: GrantFiled: December 29, 2015Date of Patent: February 13, 2018Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Sunao Takenaka, Suguru Kurita, Koichiro Sato, Koji Takahashi, Kazufumi Ishida, Yoshiki Kogiso, Takehiro Meguro
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Patent number: 9827781Abstract: A decolorizing apparatus of an exemplary embodiment includes a feeding section, a decolorizing section, and a control section. The feeding section can supply a magnetic medium having a ferromagnet in at least a part thereof. The decolorizing section decolorizes a decolorable image formed on the magnetic medium by heating the magnetic medium. The control section controls the decolorizing section to be set to a temperature which is equal to or higher than a temperature at which the image can be decolorized and is lower than a Curie temperature of the ferromagnet of the magnetic medium during decolorizing of the magnetic medium.Type: GrantFiled: May 20, 2016Date of Patent: November 28, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi Ishida, Toshifumi Mimura
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Publication number: 20170261907Abstract: A magnetic sheet transport apparatus according to an embodiment includes a transport path on which a magnetic sheet having a magnetic flux is transported. A magnetic member is disposed on the transport path. A separation unit is disposed on the magnetic member. The separation unit causes the magnetic sheet to be separated from the magnetic member so that the magnetic sheet being transported on the transport path is not pushed onto the magnetic member by the magnetic flux.Type: ApplicationFiled: May 25, 2017Publication date: September 14, 2017Inventor: Kazufumi ISHIDA
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Publication number: 20170185004Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.Type: ApplicationFiled: December 29, 2015Publication date: June 29, 2017Inventors: Sunao Takenaka, Suguru Kurita, Koichiro Sato, Koji Takahashi, Kazufumi Ishida, Yoshiki Kogiso, Takehiro Meguro
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Patent number: 9665054Abstract: A magnetic sheet transport apparatus according to an embodiment includes a transport path on which a magnetic sheet having a magnetic flux is transported. A magnetic member is disposed on the transport path. A separation unit is disposed on the magnetic member. The separation unit causes the magnetic sheet to be separated from the magnetic member so that the magnetic sheet being transported on the transport path is not pushed onto the magnetic member by the magnetic flux.Type: GrantFiled: June 5, 2015Date of Patent: May 30, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Kazufumi Ishida
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Publication number: 20160342116Abstract: A decolorizing apparatus of an exemplary embodiment includes a feeding section, a decolorizing section, and a control section. The feeding section can supply a magnetic medium having a ferromagnet in at least a part thereof. The decolorizing section decolorizes a decolorable image formed on the magnetic medium by heating the magnetic medium. The control section controls the decolorizing section to be set to a temperature which is equal to or higher than a temperature at which the image can be decolorized and is lower than a Curie temperature of the ferromagnet of the magnetic medium during decolorizing of the magnetic medium.Type: ApplicationFiled: May 20, 2016Publication date: November 24, 2016Inventors: Kazufumi Ishida, Toshifumi Mimura
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Publication number: 20160339714Abstract: A decolorizing apparatus of an exemplary embodiment includes a feeding section, a decolorizing section, and a control section. The feeding section can supply a magnetic medium having a ferromagnet in at least a part thereof. The decolorizing section decolorizes a decolorable image formed on the magnetic medium by heating the magnetic medium. The control section controls the decolorizing section to be set to a temperature which is equal to or higher than a temperature at which the image can be decolorized and is lower than a Curie temperature of the ferromagnet of the magnetic medium during decolorizing of the magnetic medium.Type: ApplicationFiled: May 21, 2015Publication date: November 24, 2016Inventors: Kazufumi Ishida, Toshifumi Mimura
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Patent number: 9487041Abstract: A decolorizing apparatus of an exemplary embodiment includes a feeding section, a decolorizing section, and a control section. The feeding section can supply a magnetic medium having a ferromagnet in at least a part thereof. The decolorizing section decolorizes a decolorable image formed on the magnetic medium by heating the magnetic medium. The control section controls the decolorizing section to be set to a temperature which is equal to or higher than a temperature at which the image can be decolorized and is lower than a Curie temperature of the ferromagnet of the magnetic medium during decolorizing of the magnetic medium.Type: GrantFiled: May 21, 2015Date of Patent: November 8, 2016Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Kazufumi Ishida, Toshifumi Mimura
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Publication number: 20150360891Abstract: A magnetic sheet transport apparatus according to an embodiment includes a transport path on which a magnetic sheet having a magnetic flux is transported. A magnetic member is disposed on the transport path. A separation unit is disposed on the magnetic member. The separation unit causes the magnetic sheet to be separated from the magnetic member so that the magnetic sheet being transported on the transport path is not pushed onto the magnetic member by the magnetic flux.Type: ApplicationFiled: June 5, 2015Publication date: December 17, 2015Inventor: Kazufumi ISHIDA
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Publication number: 20110280604Abstract: According to one embodiment, an image forming apparatus includes: a charging device configured to apply a voltage to a photoconductive drum to set the photoconductive drum to surface potential V0; a laser-beam irradiating unit configured to form an electrostatic latent image having potential Ver on the photoconductive drum; a neutralizing section configured to generate an electrostatic latent image for detection having the potential Ver on the photoconductive drum; a surface-potential detecting section configured to detect the surface potential V0 of the photoconductive drum; a density detecting section configured to detect printing density of a test patch for density measurement; and a control section configured to control, when a contrast potential Vc is adjusted, the surface potential V0 on a negative side at potential equal to or larger than a threshold.Type: ApplicationFiled: April 20, 2011Publication date: November 17, 2011Applicants: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA TOSHIBAInventor: Kazufumi Ishida