Patents by Inventor Takeharu Nakada
Takeharu Nakada 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: 20230213745Abstract: An optical system includes, in order from an object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a third lens unit having positive refractive power. A distance between adjacent lens units changes during focusing. During focusing from an infinity object to the closest object, the first and third lens units do not move and the second lens unit moves toward the image side. The third lens unit consists of, in order from the object side, a first subunit having positive refractive power, a second subunit having negative refractive power, and a third subunit having positive refractive power. The second subunit moves in a direction including a component in a direction orthogonal to an optical axis during image stabilization. The second subunit includes positive and negative lenses. A predetermined condition is satisfied.Type: ApplicationFiled: December 29, 2022Publication date: July 6, 2023Inventor: TAKEHARU NAKADA
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Publication number: 20230020736Abstract: An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a diaphragm, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. A distance between adjacent lens units is changed during focusing. The second lens unit is moved to the image side during focusing from an object at infinity to a short-distance object. The first lens unit includes a positive lens closest to an object and two or more negative lenses. The second lens unit consists of a single negative lens. A predetermined condition is satisfied.Type: ApplicationFiled: July 6, 2022Publication date: January 19, 2023Inventors: Takeharu Nakada, Takahiro Hatada
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Patent number: 11112737Abstract: A fixing apparatus includes a tubular film, an elongate plate-like heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater being in contact with the inner surface of the film with the second surface, a heat conducting member that is long along the length of the heater and is in contact with the second surface of the heater, and a support member capable of rotating the film while supporting the heater, with the heat conducting member therebetween. The heat conducting member includes an extending portion extending, outside an upstream end of the heater in a rotational direction of the film, in a direction from the second surface of the heater toward the first surface. The extending portion includes a contact portion protruding from the first surface of the heater toward the film into contact therewith.Type: GrantFiled: April 12, 2018Date of Patent: September 7, 2021Assignee: Canon Kabushiki KaishaInventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada, Akihito Kanamori, Yusuke Nakazono, Shinji Kubo
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Patent number: 10725407Abstract: A fixing apparatus includes a holding member including a groove-like holding portion, a heater supported by the holding portion, a film rotatable around the heater, the film being configured to be heated by sliding on the heater and to heat a toner image on a printing material, and a gap filling member including, on an upstream side with respect to the heater in a direction in which the circumferential surface of the film moves, a first portion disposed between the heater and the holding member and a first contact portion connecting to the first portion and being in contact with the film. A second distance between the first portion and the holding member disposed upstream from the first portion and facing the first portion is smaller than a first distance between the heater and the first portion disposed upstream from the heater and facing the holding member.Type: GrantFiled: March 18, 2019Date of Patent: July 28, 2020Assignee: Canon Kabushiki KaishaInventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada
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Patent number: 10725405Abstract: A fixing device including a rotatable tubular film, a heater including a substrate and a heat generating resistor, the heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater extending in a longitudinal direction of the substrate, and a heat conducting member extending in the longitudinal direction and including a heater contact portion in contact with the second surface. The heat conducting member includes a film contact portion at a position adjacent to the first surface, the film contact portion being in contact with the inner circumferential surface, and on one side in the longitudinal direction, the heat generating resistor extends outside of a longitudinal end portion of the film contact portion, and the heater contact portion extends outside of the film contact portion.Type: GrantFiled: October 10, 2018Date of Patent: July 28, 2020Assignee: Canon Kabushiki KaishaInventors: Tomoo Akizuki, Masahiko Suzumi, Tatsuya Kinukawa, Takeharu Nakada, Ryo Morihara
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Publication number: 20200192259Abstract: A fixing apparatus includes a tubular film, an elongate plate-like heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater being in contact with the inner surface of the film with the second surface, a heat conducting member that is long along the length of the heater and is in contact with the second surface of the heater, and a support member capable of rotating the film while supporting the heater, with the heat conducting member therebetween. The heat conducting member includes an extending portion extending, outside an upstream end of the heater in a rotational direction of the film, in a direction from the second surface of the heater toward the first surface. The extending portion includes a contact portion protruding from the first surface of the heater toward the film into contact therewith.Type: ApplicationFiled: April 12, 2018Publication date: June 18, 2020Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada, Akihito Kanamori, Yusuke Nakazono, Shinji Kubo
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Patent number: 10649375Abstract: An image forming apparatus includes an image forming portion, a fixing portion, a temperature detecting portion, a measuring portion, a storing portion, and a controller. The controller is capable of setting a case that a start of feeding of a recording material is permitted after a lapse of a predetermined time need to measure a temperature rising rate of the fixing portion and a case that the start of feeding of the recording material is permitted, depending on a value relating to the temperature rising rate stored in the storing portion, at timing before the lapse of the predetermined time.Type: GrantFiled: February 11, 2019Date of Patent: May 12, 2020Assignee: Canon Kabushiki KaishaInventors: Takeharu Nakada, Tomoo Akizuki, Ryo Morihara, Masahiko Suzumi
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Publication number: 20190302664Abstract: A fixing apparatus includes a holding member including a groove-like holding portion, a heater supported by the holding portion, a film rotatable around the heater, the film being configured to be heated by sliding on the heater and to heat a toner image on a printing material, and a gap filling member including, on an upstream side with respect to the heater in a direction in which the circumferential surface of the film moves, a first portion disposed between the heater and the holding member and a first contact portion connecting to the first portion and being in contact with the film. A second distance between the first portion and the holding member disposed upstream from the first portion and facing the first portion is smaller than a first distance between the heater and the first portion disposed upstream from the heater and facing the holding member.Type: ApplicationFiled: March 18, 2019Publication date: October 3, 2019Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada
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Publication number: 20190250542Abstract: An image forming apparatus includes an image forming portion, a fixing portion, a temperature detecting portion, a measuring portion, a storing portion, and a controller. The controller is capable of setting a case that a start of feeding of a recording material is permitted after a lapse of a predetermined time need to measure a temperature rising rate of the fixing portion and a case that the start of feeding of the recording material is permitted, depending on a value relating to the temperature rising rate stored in the storing portion, at timing before the lapse of the predetermined time.Type: ApplicationFiled: February 11, 2019Publication date: August 15, 2019Inventors: Takeharu Nakada, Tomoo Akizuki, Ryo Morihara, Masahiko Suzumi
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Patent number: 10359715Abstract: An image forming apparatus including: a charging member configured to charge a photosensitive member at a charging portion by a charging voltage in which an alternate-current voltage is superimposed on a direct-current voltage; a transfer member configured to transfer a toner image formed on the photosensitive member to a recording material at a transfer portion; and a controller configured to control the charging voltage, a predetermined area of the photosensitive member passing through the transfer portion during a trailing edge of the recording material passing through the transfer portion, wherein the controller controls a value of a peak-to-peak voltage of the alternate-current voltage when the predetermined area passes through the charging portion to be larger than a value of a peak-to-peak voltage when an area that becomes the image area other than the predetermined area passes through the charging portion.Type: GrantFiled: January 23, 2018Date of Patent: July 23, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takeharu Nakada, Tatsuya Kinukawa, Tomoo Akizuki, Masahiko Suzumi, Ryo Morihara, Yusuke Nakazono, Junichi Kubota, Takayuki Kanazawa
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Publication number: 20190113868Abstract: A fixing device including a rotatable tubular film, a heater including a substrate and a heat generating resistor, the heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater extending in a longitudinal direction of the substrate, and a heat conducting member extending in the longitudinal direction and including a heater contact portion in contact with the second surface. The heat conducting member includes a film contact portion at a position adjacent to the first surface, the film contact portion being in contact with the inner circumferential surface, and on one side in the longitudinal direction, the heat generating resistor extends outside of a longitudinal end portion of the film contact portion, and the heater contact portion extends outside of the film contact portion.Type: ApplicationFiled: October 10, 2018Publication date: April 18, 2019Inventors: Tomoo Akizuki, Masahiko Suzumi, Tatsuya Kinukawa, Takeharu Nakada, Ryo Morihara
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Publication number: 20180210366Abstract: An image forming apparatus including: a charging member configured to charge a photosensitive member at a charging portion by a charging voltage in which an alternate-current voltage is superimposed on a direct-current voltage; a transfer member configured to transfer a toner image formed on the photosensitive member to a recording material at a transfer portion; and a controller configured to control the charging voltage, a predetermined area of the photosensitive member passing through the transfer portion during a trailing edge of the recording material passing through the transfer portion, wherein the controller controls a value of a peak-to-peak voltage of the alternate-current voltage when the predetermined area passes through the charging portion to be larger than a value of a peak-to-peak voltage when an area that becomes the image area other than the predetermined area passes through the charging portion.Type: ApplicationFiled: January 23, 2018Publication date: July 26, 2018Inventors: Takeharu Nakada, Tatsuya Kinukawa, Tomoo Akizuki, Masahiko Suzumi, Ryo Morihara, Yusuke Nakazono, Junichi Kubota, Takayuki Kanazawa
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Patent number: 9471016Abstract: A fixing apparatus for fixing an image on a recording material includes a cylindrical film, a heater configured to heat the film, the heater contacting an inner surface of the film, a heat transfer member configured to contact a surface opposite to a surface of the heater that contacts the inner surface of the film, and a support member configured to support the heater. A heat capacity per unit length of a first portion that is a portion of the heat transfer member corresponding to a region near an end of the recording material in a width direction among non-sheet passing region is larger than that of a second portion that is a portion of the heat transfer member corresponding to a center of the recording material in the width direction.Type: GrantFiled: February 11, 2015Date of Patent: October 18, 2016Assignee: Canon Kabushiki KaishaInventors: Takeharu Nakada, Sho Taguchi
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Patent number: 9250582Abstract: A fixing apparatus configured to heat a recording material having a toner image formed thereon and fix the toner image fixing on the recording material comprising: a film; a heater configured to contact the film, the heater including a substrate and a heat generation resistor formed on the substrate; a thermal conduction member configured to contact a surface of the heater opposite to a surface of the heater that contacts the film, the thermal conduction member having a thermal conductivity higher than that of the substrate; and a pressurizing roller configured to form a pressing portion with the heater via the film, wherein the thermal conduction member contacts the heater so as not to overlap with an end region of the heat generation resistor in a longitudinal direction of the heat generation member.Type: GrantFiled: November 12, 2014Date of Patent: February 2, 2016Assignee: Canon Kabushiki KaishaInventors: Masahiko Suzumi, Masahito Omata, Shoichiro Ikegami, Sho Taguchi, Takeharu Nakada
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Patent number: 9217972Abstract: A fixing device includes a tubular film; a heater including a substrate and a heat generating resistor, the heater having a first region on which the heat generating resistor is formed and a second region, located outside of the first region in a longitudinal direction of the substrate, on which the heat generating resistor is not formed; and a heat conductive member configured to contact a surface of the heater opposite to a surface of the heater that contacts the film, the heat conductive member having a higher heat conductivity than the substrate. The heat conductive member contacts the heater in a region extending across the first region and the second region, and an amount of heat generated by the heat generating resistor at its end portion is greater than that at its middle portion in the longitudinal direction.Type: GrantFiled: March 13, 2015Date of Patent: December 22, 2015Assignee: Canon Kabushiki KaishaInventors: Sho Taguchi, Masahiko Suzumi, Masahito Omata, Shoichiro Ikegami, Takeharu Nakada
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Publication number: 20150261145Abstract: A fixing device includes a tubular film; a heater including a substrate and a heat generating resistor, the heater having a first region on which the heat generating resistor is formed and a second region, located outside of the first region in a longitudinal direction of the substrate, on which the heat generating resistor is not formed; and a heat conductive member configured to contact a surface of the heater opposite to a surface of the heater that contacts the film, the heat conductive member having a higher heat conductivity than the substrate. The heat conductive member contacts the heater in a region extending across the first region and the second region, and an amount of heat generated by the heat generating resistor at its end portion is greater than that at its middle portion in the longitudinal direction.Type: ApplicationFiled: March 13, 2015Publication date: September 17, 2015Inventors: Sho Taguchi, Masahiko Suzumi, Masahito Omata, Shoichiro Ikegami, Takeharu Nakada
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Publication number: 20150234330Abstract: A fixing apparatus for fixing an image on a recording material includes a cylindrical film, a heater configured to heat the film, the heater contacting an inner surface of the film, a heat transfer member configured to contact a surface opposite to a surface of the heater that contacts the inner surface of the film, and a support member configured to support the heater. A heat capacity per unit length of a first portion that is a portion of the heat transfer member corresponding to a region near an end of the recording material in a width direction among non-sheet passing region is larger than that of a second portion that is a portion of the heat transfer member corresponding to a center of the recording material in the width direction.Type: ApplicationFiled: February 11, 2015Publication date: August 20, 2015Inventors: Takeharu Nakada, Sho Taguchi
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Publication number: 20150139707Abstract: A fixing apparatus configured to heat a recording material having a toner image formed thereon and fix the toner image fixing on the recording material comprising: a film; a heater configured to contact the film, the heater including a substrate and a heat generation resistor formed on the substrate; a thermal conduction member configured to contact a surface of the heater opposite to a surface of the heater that contacts the film, the thermal conduction member having a thermal conductivity higher than that of the substrate; and a pressurizing roller configured to form a pressing portion with the heater via the film, wherein the thermal conduction member contacts the heater so as not to overlap with an end region of the heat generation resistor in a longitudinal direction of the heat generation member.Type: ApplicationFiled: November 12, 2014Publication date: May 21, 2015Inventors: Masahiko Suzumi, Masahito Omata, Shoichiro Ikegami, Sho Taguchi, Takeharu Nakada