Patents by Inventor Masakazu Tatsumi
Masakazu Tatsumi 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: 20230418213Abstract: A cartridge includes a container, a light guide including incident and emergent portions, and a cover including outer and inner surfaces. When a direction directing from the outer surface toward the inner surface is a first direction, and a direction in which the incident and emergent portions are arranged is a second direction, (i) the outer surface is recessed toward a downstream side of the first direction between the incident and emergent portions, (ii) a first end of a bottom of the recessed portion on an incident portion side is positioned on a side downstream with respect to the first direction, of a second end of the bottom on an emergent portion side, and (iii) the bottom is curved so as to be recessed toward the downstream side of the first direction between the first and second ends relative to an imaginary rectilinear line connecting these ends.Type: ApplicationFiled: June 8, 2023Publication date: December 28, 2023Inventors: YUKO HARADA, RYUTA MURAKAMI, MASAKAZU TATSUMI, AKIRA YOSHIMURA, SATOSHI KOGA
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Patent number: 11550255Abstract: An image forming apparatus including a photosensitive member, a developing cartridge that has a developing member, a developing frame, an end member attached to the developing frame, and a restricting portion restricting a swing movement of the end member, and an apparatus body to which the developing cartridge is attachable. The apparatus body includes a movement unit moving the developing cartridge from a first position to a second position, a positioning portion engaging with the end member when the developing cartridge is located at the second position, and a restriction releasing portion acting on the restricting portion with a movement of the developing cartridge from the first position to the second position and releasing restriction of the swing movement of the end member, the restriction releasing portion being provided at a part of the apparatus main body excluding the movement unit.Type: GrantFiled: July 2, 2021Date of Patent: January 10, 2023Assignee: Canon Kabushiki KaishaInventors: Masato Tanabe, Masakazu Tatsumi, Tatsuro Harada
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Patent number: 11500305Abstract: A process cartridge includes a photosensitive member and a developing unit. The developing unit includes a frame to store toner, a developing roller to carry the toner, a side seal to contact an end portion of the developing roller and prevent the toner from leaking out, and a sealing sheet to contact a center portion of the developing roller and prevent the toner from leaking out. A toner receiving portion of the frame includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member, and moreover is disposed at a position overlapping with the side seal. The developing unit includes a blocking member to block at least a part of the opening, and the blocking member is disposed between the opening and the developing roller.Type: GrantFiled: November 19, 2021Date of Patent: November 15, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Noriyuki Komatsu, Tomonori Mori, Teruhiko Sasaki, Makoto Hayashida, Masakazu Tatsumi
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Patent number: 11360427Abstract: In a remanufacturing method for remanufacturing a cartridge from a material cartridge, the material cartridge is attachable to and detachable from an apparatus main body of an image forming apparatus, and the apparatus main body includes a guide member. The material cartridge includes a frame member including an engagement portion configured to be engaged with the guide member, and a first attachment portion provided in the engagement portion, and a first storage member. The first storage member includes a first holding portion configured to hold a first electrode and be attached to the first attachment portion. The remanufacturing method includes detaching the first holding portion, attaching a second electrode to the frame member, and attaching a second storage element to the frame member at a different position from a position of the first attachment portion.Type: GrantFiled: February 17, 2021Date of Patent: June 14, 2022Assignee: Canon Kabushiki KaishaInventors: Hiroki Shimizu, Tomofumi Kawamura, Masakazu Tatsumi
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Publication number: 20220075288Abstract: A process cartridge includes a photosensitive member and a developing unit. The developing unit includes a frame to store toner, a developing roller to carry the toner, a side seal to contact an end portion of the developing roller and prevent the toner from leaking out, and a sealing sheet to contact a center portion of the developing roller and prevent the toner from leaking out. A toner receiving portion of the frame includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member, and moreover is disposed at a position overlapping with the side seal. The developing unit includes a blocking member to block at least a part of the opening, and the blocking member is disposed between the opening and the developing roller.Type: ApplicationFiled: November 19, 2021Publication date: March 10, 2022Inventors: Noriyuki Komatsu, Tomonori Mori, Teruhiko Sasaki, Makoto Hayashida, Masakazu Tatsumi
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Patent number: 11209749Abstract: A process cartridge includes a photosensitive member and a developing unit. The developing unit includes a frame to store toner, a developing roller to carry the toner, a side seal to contact an end portion of the developing roller and prevent the toner from leaking out, and a sealing sheet to contact a center portion of the developing roller and prevent the toner from leaking out. A toner receiving portion of the frame includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member, and moreover is disposed at a position overlapping with the side seal. The developing unit includes a blocking member to block at least a part of the opening, and the blocking member is disposed between the opening and the developing roller.Type: GrantFiled: December 21, 2020Date of Patent: December 28, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Noriyuki Komatsu, Tomonori Mori, Teruhiko Sasaki, Makoto Hayashida, Masakazu Tatsumi
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Publication number: 20210333742Abstract: An image forming apparatus including a photosensitive member, a developing cartridge that has a developing member, a developing frame, an end member attached to the developing frame, and a restricting portion restricting a swing movement of the end member, and an apparatus body to which the developing cartridge is attachable. The apparatus body includes a movement unit moving the developing cartridge from a first position to a second position, a positioning portion engaging with the end member when the developing cartridge is located at the second position, and a restriction releasing portion acting on the restricting portion with a movement of the developing cartridge from the first position to the second position and releasing restriction of the swing movement of the end member, the restriction releasing portion being provided at a part of the apparatus main body excluding the movement unit.Type: ApplicationFiled: July 2, 2021Publication date: October 28, 2021Inventors: Masato Tanabe, Masakazu Tatsumi, Tatsuro Harada
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Patent number: 11086267Abstract: An image forming apparatus including a photosensitive member, a developing cartridge that has a developing member, a developing frame, an end member attached to the developing frame, and a restricting portion restricting a swing movement of the end member, and an apparatus body to which the developing cartridge is attachable. The apparatus body includes a movement unit moving the developing cartridge from a first position to a second position, a positioning portion engaging with the end member when the developing cartridge is located at the second position, and a restriction releasing portion acting on the restricting portion with a movement of the developing cartridge from the first position to the second position and releasing restriction of the swing movement of the end member, the restriction releasing portion being provided at a part of the apparatus main body excluding the movement unit.Type: GrantFiled: September 13, 2019Date of Patent: August 10, 2021Assignee: Canon Kabushiki KaishaInventors: Masato Tanabe, Masakazu Tatsumi, Tatsuro Harada
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Publication number: 20210200121Abstract: A process cartridge includes a photosensitive member and a developing unit. The developing unit includes a frame to store toner, a developing roller to carry the toner, a side seal to contact an end portion of the developing roller and prevent the toner from leaking out, and a sealing sheet to contact a center portion of the developing roller and prevent the toner from leaking out. A toner receiving portion of the frame includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member, and moreover is disposed at a position overlapping with the side seal. The developing unit includes a blocking member to block at least a part of the opening, and the blocking member is disposed between the opening and the developing roller.Type: ApplicationFiled: December 21, 2020Publication date: July 1, 2021Inventors: Noriyuki Komatsu, Tomonori Mori, Teruhiko Sasaki, Makoto Hayashida, Masakazu Tatsumi
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Publication number: 20210173339Abstract: In a remanufacturing method for remanufacturing a cartridge from a material cartridge, the material cartridge is attachable to and detachable from an apparatus main body of an image forming apparatus, and the apparatus main body includes a guide member. The material cartridge includes a frame member including an engagement portion configured to be engaged with the guide member, and a first attachment portion provided in the engagement portion, and a first storage member. The first storage member includes a first holding portion configured to hold a first electrode and be attached to the first attachment portion. The remanufacturing method includes detaching the first holding portion, attaching a second electrode to the frame member, and attaching a second storage element to the frame member at a different position from a position of the first attachment portion.Type: ApplicationFiled: February 17, 2021Publication date: June 10, 2021Inventors: Hiroki Shimizu, Tomofumi Kawamura, Masakazu Tatsumi
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Patent number: 10955794Abstract: In a remanufacturing method for remanufacturing a cartridge from a material cartridge, the material cartridge is attachable to and detachable from an apparatus main body of an image forming apparatus, and the apparatus main body includes a guide member. The material cartridge includes a frame member including an engagement portion configured to be engaged with the guide member, and a first attachment portion provided in the engagement portion, and a first storage member. The first storage member includes a first holding portion configured to hold a first electrode and be attached to the first attachment portion. The remanufacturing method includes detaching the first holding portion, attaching a second electrode to the frame member, and attaching a second storage element to the frame member at a different position from a position of the first attachment portion.Type: GrantFiled: February 28, 2020Date of Patent: March 23, 2021Assignee: Canon Kabushiki KaishaInventors: Hiroki Shimizu, Tomofumi Kawamura, Masakazu Tatsumi
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Publication number: 20200285191Abstract: In a remanufacturing method for remanufacturing a cartridge from a material cartridge, the material cartridge is attachable to and detachable from an apparatus main body of an image forming apparatus, and the apparatus main body includes a guide member. The material cartridge includes a frame member including an engagement portion configured to be engaged with the guide member, and a first attachment portion provided in the engagement portion, and a first storage member. The first storage member includes a first holding portion configured to hold a first electrode and be attached to the first attachment portion. The remanufacturing method includes detaching the first holding portion, attaching a second electrode to the frame member, and attaching a second storage element to the frame member at a different position from a position of the first attachment portion.Type: ApplicationFiled: February 28, 2020Publication date: September 10, 2020Inventors: Hiroki Shimizu, Tomofumi Kawamura, Masakazu Tatsumi
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Patent number: 10732545Abstract: A method for remanufacturing a cartridge from a source cartridge, wherein the source cartridge includes a first unit and a second unit, the first unit including a first memory unit having a first electrode and a first storage element electrically connected to the first electrode. The method includes removing the first memory unit from the first unit, attaching a second electrode of a second memory unit to the first unit, and attaching a second storage element of the second memory unit to the second unit. The second electrode and the second storage element are connected by a connecting member so that when the second unit moves relative to the first unit, electrical connection between the second electrode and the second storage element is maintained, and the second electrode is electrically connected to a main body electrode of an information apparatus.Type: GrantFiled: August 21, 2019Date of Patent: August 4, 2020Assignee: Canon Kabushiki KaishaInventors: Toshiaki Takeuchi, Shuichi Gofuku, Yu Akiba, Shota Nakamura, Masakazu Tatsumi, Hiroki Shimizu, Tomofumi Kawamura
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Publication number: 20200096935Abstract: An image forming apparatus including a photosensitive member, a developing cartridge that has a developing member, a developing frame, an end member attached to the developing frame, and a restricting portion restricting a swing movement of the end member, and an apparatus body to which the developing cartridge is attachable. The apparatus body includes a movement unit moving the developing cartridge from a first position to a second position, a positioning portion engaging with the end member when the developing cartridge is located at the second position, and a restriction releasing portion acting on the restricting portion with a movement of the developing cartridge from the first position to the second position and releasing restriction of the swing movement of the end member, the restriction releasing portion being provided at a part of the apparatus main body excluding the movement unit.Type: ApplicationFiled: September 13, 2019Publication date: March 26, 2020Inventors: Masato Tanabe, Masakazu Tatsumi, Tatsuro Harada
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Publication number: 20200073286Abstract: A method for remanufacturing a cartridge from a source cartridge, wherein the source cartridge includes a first unit and a second unit, the first unit including a first memory unit having a first electrode and a first storage element electrically connected to the first electrode, the method including: removing the first memory unit from the first unit; and attaching the second electrode of a second memory unit to the first unit and attaching the second storage element of the second memory unit to the second unit, wherein the second electrode and the second storage element are connected by a connecting member so that when the second unit moves relative to the first unit, electrical connection between the second electrode and the second storage element is maintained, and the second electrode is electrically connected to a main body electrode of an information apparatus.Type: ApplicationFiled: August 21, 2019Publication date: March 5, 2020Inventors: Toshiaki Takeuchi, Shuichi Gofuku, Yu Akiba, Shota Nakamura, Masakazu Tatsumi, Hiroki Shimizu, Tomofumi Kawamura
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Patent number: 9736076Abstract: A configuration in which a device server is connected to a client and is also locally connected to a USB device suppresses data transfer volume fluctuation due to network delay, maintains the data transferring volume at a value guaranteed by the isochronous output transfer and improves network robustness under the isochronous output transfer process. The device server includes a data buffer portion for the isochronous output transfer data and performs advance reading of the isochronous output transfer data after sending back a transfer completion response unconditionally to the client upon receiving an isochronous output transfer request from the client. When the retention data volume in the data buffer portion reaches the upper limit threshold, the transfer data buffered in the data buffer portion is transferred to the device over the isochronous output transfer.Type: GrantFiled: February 2, 2015Date of Patent: August 15, 2017Assignee: Silex Technology, Inc.Inventors: Kenta Nishihara, Kazutoshi Takata, Masakazu Tatsumi
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Publication number: 20150229570Abstract: A configuration in which a device server is connected to a client and is also locally connected to a USB device suppresses data transfer volume fluctuation due to network delay, maintains the data transferring volume at a value guaranteed by the isochronous output transfer and improves network robustness under the isochronous output transfer process. The device server includes a data buffer portion for the isochronous output transfer data and performs advance reading of the isochronous output transfer data after sending back a transfer completion response unconditionally to the client upon receiving an isochronous output transfer request from the client. When the retention data volume in the data buffer portion reaches the upper limit threshold, the transfer data buffered in the data buffer portion is transferred to the device over the isochronous output transfer.Type: ApplicationFiled: February 2, 2015Publication date: August 13, 2015Inventors: Kenta NISHIHARA, Kazutoshi TAKATA, Masakazu TATSUMI
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Patent number: D261266Type: GrantFiled: January 23, 1980Date of Patent: October 13, 1981Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshihiko Yoshida, Masakazu Tatsumi, Seiichi Sakakibara, Toshiki Kubo, Tsugio Akita, Yoshiaki Ueda
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Patent number: D881986Type: GrantFiled: February 1, 2018Date of Patent: April 21, 2020Inventors: Tatsuro Harada, Masakazu Tatsumi, Teruhiko Sasaki