Patents by Inventor Akihisa Matsukawa
Akihisa Matsukawa 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: 11970390Abstract: The present disclosure provides a method for producing a microchannel device, which can form a channel that has high hydrophobicity, high solvent resistance as well, and also resistance to heat and damage, on demand with high accuracy, and produces the microchannel device at a low cost, while having high productivity. The method for producing a microchannel device includes: forming a channel pattern from a hydrophobic resin on a porous substrate by an electrophotographic method; melting the channel pattern by heat to allow the channel pattern to permeate into the porous substrate, thereby forming a channel in the inside of the porous substrate.Type: GrantFiled: February 22, 2022Date of Patent: April 30, 2024Assignee: Canon Kabushiki KaishaInventors: Takeshi Yamamoto, Jun Miura, Keiji Miyazaki, Hiroki Tanaka, Makoto Fukatsu, Akihisa Matsukawa, Takayuki Kanazawa, Keigo Mizusawa, Masanori Seki, Masanori Tanaka
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Publication number: 20230390765Abstract: It is possible to provide a microchannel device with excellent resistance to bending and suppressed deterioration in inspection accuracy. A microchannel device has a channel sandwiched between channel walls formed in an inside a porous substrate, the channel wall contains a thermoplastic resin and a wax, and a proportion of the wax in an area of a surface side of the channel wall facing the channel is higher than a proportion of the wax inside the channel wall.Type: ApplicationFiled: August 22, 2023Publication date: December 7, 2023Inventors: AKIHISA MATSUKAWA, MAKOTO FUKATSU, MASANORI TANAKA, TAKESHI YAMAMOTO, Keiji Miyazaki, JUN MIURA, HARUNOBU MAEDA, FUKA ENOKIDO, YUHEI TERUI
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Publication number: 20230390764Abstract: The present disclosure provides a microchannel device that has a channel sandwiched between channel walls formed in an inside of a porous substrate, wherein the channel wall contains a thermoplastic resin and a colorant, and wherein an abundance ratio of the colorant is higher in the porous substrate surface area of the channel wall than in an internal area of the channel wall. In the configuration of the present disclosure, since more of the colorant exist on the surface side of the porous substrate in the channel wall, the visibility of the channel is increased, and in addition, since the amount of the colorant in the internal portion of the channel wall is small, the elution of the ions contained in the colorant into the specimen is suppressed, and the measurement accuracy is increased.Type: ApplicationFiled: August 22, 2023Publication date: December 7, 2023Inventors: MAKOTO FUKATSU, MASANORI TANAKA, TAKESHI YAMAMOTO, Keiji Miyazaki, JUN MIURA, HARUNOBU MAEDA, FUKA ENOKIDO, AKIHISA MATSUKAWA, YUHEI TERUI
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Patent number: 11829087Abstract: An image forming apparatus includes a first image forming portion, a second image forming portion, a belt, a charging voltage applying portion, and a transfer voltage applying portion. With respect to a movement direction of a recording material, the first image forming portion is provided upstream of the second image forming portion. In an image forming operation, a potential difference between a first transfer voltage and a potential at a first transfer portion, which is formed on a first image bearing member and does not form the image, is greater than a potential difference between a second transfer voltage and a potential at a second transfer portion, which is formed on a second image bearing member and does not form an image.Type: GrantFiled: November 18, 2022Date of Patent: November 28, 2023Assignee: Canon Kabushiki KaishaInventors: Hiroki Tanaka, Satoru Motohashi, Nobuo Oshima, Akihisa Matsukawa, Katsuichi Abe, Takayuki Namiki
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Publication number: 20230078948Abstract: An image forming apparatus includes a first image forming portion, a second image forming portion, a belt, a charging voltage applying portion, and a transfer voltage applying portion. With respect to a movement direction of a recording material, the first image forming portion is provided upstream of the second image forming portion. In an image forming operation, a potential difference between a first transfer voltage and a potential at a first transfer portion, which is formed on a first image bearing member and does not form the image, is greater than a potential difference between a second transfer voltage and a potential at a second transfer portion, which is formed on a second image bearing member and does not form an image.Type: ApplicationFiled: November 18, 2022Publication date: March 16, 2023Inventors: Hiroki Tanaka, Satoru Motohashi, Nobuo Oshima, Akihisa Matsukawa, Katsuichi Abe, Takayuki Namiki
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Patent number: 11526103Abstract: An image forming apparatus includes a first image forming portion, a second image forming portion, a belt, a charging voltage applying portion, and a transfer voltage applying portion. With respect to a movement direction of a recording material, the first image forming portion is provided upstream of the second image forming portion. In an image forming operation, a potential difference between a first transfer voltage and a potential at a first transfer portion, which is formed on a first image bearing member and does not form the image, is greater than a potential difference between a second transfer voltage and a potential at a second transfer portion, which is formed on a second image bearing member and does not form an image.Type: GrantFiled: November 15, 2021Date of Patent: December 13, 2022Assignee: Canon Kabushiki KaishaInventors: Hiroki Tanaka, Satoru Motohashi, Nobuo Oshima, Akihisa Matsukawa, Katsuichi Abe, Takayuki Namiki
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Publication number: 20220206415Abstract: An image forming apparatus includes a first image forming portion, a second image forming portion, a belt, a charging voltage applying portion, and a transfer voltage applying portion. With respect to a movement direction of the recording material, the first image forming portion is provided upstream of the second image forming portion. In an image forming operation, a potential difference between the first transfer voltage and a potential, at the first transfer portion, which is formed on the first image bearing member and does not form the image is larger than a potential difference between the second transfer voltage and a potential, at the second transfer portion, which is formed on the second image bearing member and does not form the image.Type: ApplicationFiled: November 15, 2021Publication date: June 30, 2022Inventors: Hiroki Tanaka, Satoru Motohashi, Nobuo Oshima, Akihisa Matsukawa, Katsuichi Abe, Takayuki Namiki
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Publication number: 20220187734Abstract: An image forming apparatus at least includes: an image bearing member; a developer container; a developer carrying member; and a controller that controls a power source that applies a voltage to the developer carrying member, wherein the developer carrying member has at least a base and a surface layer, the surface layer has an electron donating portion that mainly donates charge to the developer when the developer and the surface layer makes frictional contact to exchange charge and an electron accepting portion that mainly accepts charge from the developer, and the controller applies an AC voltage to the developer carrying member during a period in which an image forming operation is not performed and the developer carrying member is driven, the AC voltage being different from that applied during an image forming period.Type: ApplicationFiled: March 11, 2020Publication date: June 16, 2022Inventors: Yuta Isobe, Kuniaki Tamagaki, Takashi Koyanagi, Akihisa Matsukawa, Ryosuke Kanai, Hiroki Tanaka, Motonari Ito, Kazuhisa Shida, Makoto Fukatsu
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Publication number: 20220177300Abstract: The present disclosure provides a method for producing a microchannel device, which can form a channel that has high hydrophobicity, high solvent resistance as well, and also resistance to heat and damage, on demand with high accuracy, and produces the microchannel device at a low cost, while having high productivity. The method for producing a microchannel device includes: forming a channel pattern from a hydrophobic resin on a porous substrate by an electrophotographic method; melting the channel pattern by heat to allow the channel pattern to permeate into the porous substrate, thereby forming a channel in the inside of the porous substrate.Type: ApplicationFiled: February 22, 2022Publication date: June 9, 2022Inventors: Takeshi Yamamoto, Jun Miura, Keiji Miyazaki, Hiroki Tanaka, Makoto Fukatsu, Akihisa Matsukawa, Takayuki Kanazawa, Keigo Mizusawa, Masanori Seki, Masanori Tanaka
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Publication number: 20220168731Abstract: Provided is a microchannel device, which has high hydrophobicity, high mechanical strength, and safety and also has high solvent resistance, and thus has wider applicability. The microchannel device includes a porous substrate having formed therein channel walls each containing a cyclic olefin copolymer that is a copolymer of an alkene and a cyclic olefin.Type: ApplicationFiled: February 17, 2022Publication date: June 2, 2022Inventors: Takeshi Yamamoto, Hiroki Tanaka, Jun Miura, Keiji Miyazaki, Makoto Fukatsu, Akihisa Matsukawa, Takayuki Kanazawa, Keigo Mizusawa, Masanori Seki, Masanori Tanaka
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Patent number: 10620568Abstract: A developing device includes a rotatable sleeve for carrying a developer including a magnetic material to develop a latent image on an image bearing member, a developer chamber, a rotatable stirring member provided inside the chamber to stir the developer while being in contact with at least a part of an inner surface of the chamber and a magnet generating a magnetic field in at least a part of a contact region between the stirring member and the inner surface. A magnetic flux density of the magnetic field at a first position in the contact region generated by the magnet is different from that in a second position which is adjacent to the first position in a rotational axis direction of the sleeve.Type: GrantFiled: April 11, 2019Date of Patent: April 14, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Hiroki Tanaka, Motonari Ito, Hideo Kihara, Akihisa Matsukawa
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Publication number: 20190317429Abstract: A developing device includes a rotatable sleeve for carrying a developer including a magnetic material to develop a latent image on an image bearing member; a developer chamber; and a rotatable stirring member provided inside the chamber to stir the developer while being in contact with at least a part of an inner surface of the chamber; a magnet generating a magnetic field in at lease a part of a contact region between the stirring member and the inner surface, wherein a magnetic flux density of the magnetic field at a first position in the contact region generated by the magnet is different from that in a second position which is adjacent to the first position in a rotational axis direction of the sleeve.Type: ApplicationFiled: April 11, 2019Publication date: October 17, 2019Inventors: Hiroki Tanaka, Motonari Ito, Hideo Kihara, Akihisa Matsukawa
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Patent number: 10209668Abstract: An image forming apparatus in which a developer bearing member is disposed below a cleaning member, which cleans a charging member, so as to overlap with the cleaning member when viewed in a vertical direction and includes a base body and an elastic layer covering the base body and having a width in a longitudinal direction of the developer bearing member that accommodates the entire region of the cleaning member in the longitudinal direction. In the longitudinal direction, the cleaning member is disposed at a position where the entire region thereof in the longitudinal direction is accommodated in the width of the elastic layer.Type: GrantFiled: April 2, 2018Date of Patent: February 19, 2019Assignee: Canon Kabushiki KaishaInventors: Akihisa Matsukawa, Toshiki Okamura, Kuniaki Tamagaki, Takanori Watanabe, Hiroyoshi Iwayama, Makoto Tokudome, Hideo Kihara, Naoki Hayashi
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Publication number: 20180224799Abstract: An image forming apparatus in which a developer bearing member is disposed below a cleaning member, which cleans a charging member, so as to overlap with the cleaning member when viewed in a vertical direction and includes a base body and an elastic layer covering the base body and having a width in a longitudinal direction of the developer bearing member that accommodates the entire region of the cleaning member in the longitudinal direction. In the longitudinal direction, the cleaning member is disposed at a position where the entire region thereof in the longitudinal direction is accommodated in the width of the elastic layer.Type: ApplicationFiled: April 2, 2018Publication date: August 9, 2018Inventors: Akihisa Matsukawa, Toshiki Okamura, Kuniaki Tamagaki, Takanori Watanabe, Hiroyoshi Iwayama, Makoto Tokudome, Hideo Kihara, Naoki Hayashi
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Patent number: 9977368Abstract: In an axial direction of a developing sleeve that bears magnetic developer on an outer circumferential surface thereof, ends of a sheet-shaped stirring member that stirs the magnetic developer in a container frame to move the magnetic developer toward the developing sleeve are disposed on an outer side of a region in a magnetic field region generated by a magnet roller disposed on an inner side of the developing sleeve. The region has a magnetic field strength equal to or larger than a predetermined magnetic flux density at which the magnetic developer can be borne on the surface of the developing sleeve.Type: GrantFiled: July 18, 2017Date of Patent: May 22, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Hiroki Tanaka, Motonari Ito, Satoshi Sunahara, Akihisa Matsukawa, Toshiki Okamura
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Patent number: 9971298Abstract: An image forming apparatus in which a developer bearing member is disposed below a cleaning member, which cleans a charging member, so as to overlap with the cleaning member when viewed in a vertical direction and includes a base body and an elastic layer covering the base body and having a width in a longitudinal direction of the developer bearing member that accommodates the entire region of the cleaning member in the longitudinal direction. In the longitudinal direction, the cleaning member is disposed at a position where the entire region thereof in the longitudinal direction is accommodated in the width of the elastic layer.Type: GrantFiled: July 14, 2017Date of Patent: May 15, 2018Assignee: Canon Kabushiki KaishaInventors: Akihisa Matsukawa, Toshiki Okamura, Kuniaki Tamagaki, Takanori Watanabe, Hiroyoshi Iwayama, Makoto Tokudome, Hideo Kihara, Naoki Hayashi
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Patent number: 9910405Abstract: A developing device includes a developer bearing member, a regulating member configured to regulate an amount of the developer borne by the developer bearing member, and a toner seal member being in contact with a peripheral surface of the developer bearing member. The regulating member includes a flexible support member and a blade member supported by the support member and being in contact with the developer bearing member, an end portion of the regulating member more protrudes toward the developer bearing member than a central portion thereof in a rotation axial direction of the developer bearing member. The toner seal member is pressed along the rotation axial direction to the end portion of the regulating member in the rotation axial direction.Type: GrantFiled: September 6, 2016Date of Patent: March 6, 2018Assignee: Canon Kabushiki KaishaInventors: Takanori Watanabe, Akihisa Matsukawa, Kuniaki Tamagaki
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Patent number: 9904202Abstract: In an image forming apparatus configured such that developer remaining on an image bearing member without being transferred to a recording material is moved from the image bearing member to a developer bearing member and then recovered in a developer storage portion 35. When forming a second image on a rear surface of the recording material having a surface on which a first image is fixed with a fixing device, a second potential difference between surface potential of the image bearing member after charging with a charging member when forming the second image and potential of the developer bearing member is less than a first potential difference when forming a first image.Type: GrantFiled: September 8, 2016Date of Patent: February 27, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Akihisa Matsukawa, Kuniaki Tamagaki, Takanori Watanabe
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Publication number: 20180024468Abstract: In an axial direction of a developing sleeve that bears magnetic developer on an outer circumferential surface thereof, ends of a sheet-shaped stirring member that stirs the magnetic developer in a container frame to move the magnetic developer toward the developing sleeve are disposed on an outer side of a region in a magnetic field region generated by a magnet roller disposed on an inner side of the developing sleeve, the region having a magnetic field strength equal to or larger than a predetermined magnetic flux density at which the magnetic developer can be borne on the surface of the developing sleeve.Type: ApplicationFiled: July 18, 2017Publication date: January 25, 2018Inventors: Hiroki Tanaka, Motonari Ito, Satoshi Sunahara, Akihisa Matsukawa, Toshiki Okamura
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Publication number: 20180024495Abstract: An image forming apparatus in which a developer bearing member is disposed below a cleaning member, which cleans a charging member, so as to overlap with the cleaning member when viewed in a vertical direction and includes a base body and an elastic layer covering the base body and having a width in a longitudinal direction of the developer bearing member that accommodates the entire region of the cleaning member in the longitudinal direction. In the longitudinal direction, the cleaning member is disposed at a position where the entire region thereof in the longitudinal direction is accommodated in the width of the elastic layer.Type: ApplicationFiled: July 14, 2017Publication date: January 25, 2018Inventors: Akihisa Matsukawa, Toshiki Okamura, Kuniaki Tamagaki, Takanori Watanabe, Hiroyoshi Iwayama, Makoto Tokudome, Hideo Kihara, Naoki Hayashi