Patents by Inventor Takuma Koizumi
Takuma Koizumi 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: 10221030Abstract: A sheet conveying apparatus includes first and second roller members fixed to a rotatable shaft, a first follower roller that cooperates with the first roller member to form a conveying nip, and a second follower roller that cooperates with the second roller member to form a conveying nip. The first and second roller members have outer periphery cut-away parts and the first and second follower rollers are moveably supported and can be biased to home positions. If the first roller member cut-away part faces the first follower roller, the first follower roller is biased to move toward a home position while the nip of the second roller member nips and conveys a sheet. If the second roller member cut-away part faces the second follower roller, the second follower roller is biased to move toward a home position while the nip of the first roller member nips and conveys a sheet.Type: GrantFiled: December 6, 2017Date of Patent: March 5, 2019Assignee: Canon Kabushiki KaishaInventor: Takuma Koizumi
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Publication number: 20180162673Abstract: A sheet conveying apparatus includes first and second roller members fixed to a rotatable shaft, a first follower roller that cooperates with the first roller member to form a conveying nip, and a second follower roller that cooperates with the second roller member to form a conveying nip. The first and second roller members have outer periphery cut-away parts and the first and second follower rollers are moveably supported and can be biased to home positions. If the first roller member cut-away part faces the first follower roller, the first follower roller is biased to move toward a home position while the nip of the second roller member nips and conveys a sheet. If the second roller member cut-away part faces the second follower roller, the second follower roller is biased to move toward a home position while the nip of the first roller member nips and conveys a sheet.Type: ApplicationFiled: December 6, 2017Publication date: June 14, 2018Inventor: Takuma Koizumi
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Publication number: 20170355546Abstract: A sheet conveyance device includes a registration roller pair including a first roller and a second roller, configured to form a nip by the first roller and the second roller, and configured to correct a skew of a sheet conveyed thereto by allowing the sheet to abut the nip. The first roller includes an outer peripheral surface with a groove portion, the groove portion being formed in a region in which a corner portion of a sheet abuts the outer peripheral surface, and causing a part of the outer peripheral surface to be concave and another part of the outer peripheral surface to be convex in an axial direction.Type: ApplicationFiled: May 24, 2017Publication date: December 14, 2017Inventor: Takuma Koizumi
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Patent number: 8172226Abstract: A sheet conveyance device has a sheet conveyance path formed by a guide member having a curved surface which is curved in a sheet conveyance direction, and a flexible sheet scanner is provided along the curved surface of the guide member, the flexible sheet scanner has an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape.Type: GrantFiled: August 3, 2007Date of Patent: May 8, 2012Assignee: Canon Kabushiki KaishaInventors: Ayumu Murakami, Haruhisa Oshida, Yuichi Yamamoto, Yusuke Imai, Kiyoshi Oyama, Takuma Koizumi, Toshifumi Itabashi
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Patent number: 8149473Abstract: An image reading apparatus is provided that can prevent image streaks due to dirt, stain or the like from being produced in an image of an original that is read while being conveyed. The image reading apparatus (A) includes an ADF (40) having a scanner unit (59) incorporated therein and comprised of a cylinder (60) having an outer peripheral surface thereof on which a plurality of read pixels (61) are arranged in a matrix. In reading an original (D), the scanner unit is rotatably driven in an original conveying direction at a circumferential speed approximately equal to an original conveying speed, and reads image information on the original passing through an image reading position (P1).Type: GrantFiled: December 22, 2005Date of Patent: April 3, 2012Assignee: Canon Kabushiki KaishaInventors: Haruhisa Oshida, Yuichi Yamamoto, Ayumu Murakami, Takuma Koizumi, Kiyoshi Oyama, Toshifumi Itabashi, Yusuke Imai
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Patent number: 8020862Abstract: A sheet conveyance device according to an aspect of the invention includes a guide member and a flexible guide assist member. The guide member constitutes a conveyance path for guiding a conveyed sheet. The guide assist member is provided in the guide member, the guide assist member is brought into contact with the conveyed sheet to apply a force to the sheet, and whereby the guide assist member assists the guidance of the sheet conveyance. The sheet conveyance device is characterized in that a sheet scanner is provided in the guide assist member. In the sheet scanner, photoelectric conversion devices formed by organic semiconductor devices are arranged.Type: GrantFiled: August 3, 2007Date of Patent: September 20, 2011Assignee: Canon Kabushiki KaishaInventors: Kiyoshi Oyama, Yusuke Imai, Toshifumi Itabashi, Takuma Koizumi, Ayumu Murakami, Yuichi Yamamoto, Haruhisa Oshida
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Patent number: 8020861Abstract: A sheet conveyance device according to an aspect of the invention includes a conveyance roller pair which is rotated to convey a sheet by receiving a driving force from a motor conveying a sheet; a conveyance guide which guides the sheet conveyed by the conveyance roller pair; and sheet detection unit for detecting the sheet guided by the conveyance guide. In the sheet conveyance device, a sheet conveyance speed of the conveyance roller pair is controlled based on information from the sheet detection unit. The sheet detection unit is a sheet scanner having an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape, and the sheet scanner is provided in an area of the conveyance guide in order to continuously detect the sheet conveyed by the conveyance roller pair in a predetermined area.Type: GrantFiled: August 3, 2007Date of Patent: September 20, 2011Assignee: Canon Kabushiki KaishaInventors: Toshifumi Itabashi, Yusuke Imai, Kiyoshi Oyama, Takuma Koizumi, Ayumu Murakami, Yuichi Yamamoto, Haruhisa Oshida
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Patent number: 7857304Abstract: An image forming apparatus including a sheet bundle boundary detecting unit which detects a boundary of sheet bundles added to a sheet storage case, and a control unit which controls a feeding condition of sheet feeding unit based on a detection result of the sheet bundle boundary detecting unit. With this, overlapping-feeding and misfeeding at the boundary between the sheet bundles are reliably prevented.Type: GrantFiled: March 25, 2009Date of Patent: December 28, 2010Assignee: Canon Kabushiki KaishaInventors: Takuma Koizumi, Daijiro Kato, Kiyoshi Oyama
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Publication number: 20090316222Abstract: An image reading apparatus is provided that can prevent image streaks due to dirt, stain or the like from being produced in an image of an original that is read while being conveyed. The image reading apparatus (A) includes an ADF (40) having a scanner unit (59) incorporated therein and comprised of a cylinder (60) having an outer peripheral surface thereof on which a plurality of read pixels (61) are arranged in a matrix. In reading an original (D), the scanner unit is rotatably driven in an original conveying direction at a circumferential speed approximately equal to an original conveying speed, and reads image information on the original passing through an image reading position (P1).Type: ApplicationFiled: December 22, 2005Publication date: December 24, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Haruhisa Oshida, Yuichi Yamamoto, Ayumu Murakami, Takuma Koizumi, Kiyoshi Oyama, Toshifumi Itabashi, Yusuke Imai
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Publication number: 20090256304Abstract: An image forming apparatus includes sheet bundle boundary detecting unit which detects a boundary of sheet bundles added to a sheet storage case, and control unit which controls a feeding condition of sheet feeding unit based on a detection result of the sheet bundle boundary detecting unit. With this, overlapping-feeding and miss-feeding at the boundary between the sheet bundles are reliably prevented.Type: ApplicationFiled: March 25, 2009Publication date: October 15, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Takuma Koizumi, Daijiro Kato, Kiyoshi Oyama
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Patent number: 7548351Abstract: An image reading device which is capable of enhancing productivity in reading bound originals, such as a book, a magazine, or a document. A sheet-scanner device implementing the image reading device includes a sheet scanner as a reader part for reading an image on an original. The sheet scanner comprises a sheet-like substrate formed thereon with a light-emitting layer that can emit light spontaneously, and a light-receiving layer on which a plurality of reading pixels are arranged. The sheet scanner is mounted in the sheet-scanner device such that the sheet scanner can be drawn out onto and in from the original.Type: GrantFiled: December 21, 2006Date of Patent: June 16, 2009Assignee: Canon Kabushiki KaishaInventors: Yusuke Imai, Toshifumi Itabashi, Kiyoshi Oyama, Takuma Koizumi, Ayumu Murakami, Yuichi Yamamoto, Haruhisa Oshida
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Publication number: 20080030810Abstract: A sheet conveyance device according to an aspect of the invention includes a sheet conveyance path formed by a guide member having a curved surface. The curved surface is curved in a sheet conveyance direction. In the sheet conveyance device, a flexible sheet scanner is provided along the curved surface of the guide member, and the flexible sheet scanner has an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape.Type: ApplicationFiled: August 3, 2007Publication date: February 7, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Ayumu Murakami, Haruhisa Oshida, Yuichi Yamamoto, Yusuke Imai, Kiyoshi Oyama, Takuma Koizumi, Toshifumi Itabashi
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Publication number: 20080030808Abstract: A sheet conveyance device according to an aspect of the invention includes a guide member and a flexible guide assist member. The guide member constitutes a conveyance path for guiding a conveyed sheet. The guide assist member is provided in the guide member, the guide assist member is brought into contact with the conveyed sheet to apply a force to the sheet, and whereby the guide assist member assists the guidance of the sheet conveyance. The sheet conveyance device is characterized in that a sheet scanner is provided in the guide assist member. In the sheet scanner, photoelectric conversion devices formed by organic semiconductor devices are arranged.Type: ApplicationFiled: August 3, 2007Publication date: February 7, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Kiyoshi OYAMA, Yusuke Imai, Toshifumi Itabashi, Takuma Koizumi, Ayumu Murakami, Yuichi Yamamoto, Haruhisa Oshida
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Publication number: 20080030809Abstract: A sheet conveyance device according to an aspect of the invention includes a conveyance roller pair which is rotated to convey a sheet by receiving a driving force from a motor conveying a sheet; a conveyance guide which guides the sheet conveyed by the conveyance roller pair; and sheet detection unit for detecting the sheet guided by the conveyance guide. In the sheet conveyance device, a sheet conveyance speed of the conveyance roller pair is controlled based on information from the sheet detection unit. The sheet detection unit is a sheet scanner having an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape, and the sheet scanner is provided in an area of the conveyance guide in order to continuously detect the sheet conveyed by the conveyance roller pair in a predetermined area.Type: ApplicationFiled: August 3, 2007Publication date: February 7, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Toshifumi Itabashi, Yusuke Imai, Kiyoshi Oyama, Takuma Koizumi, Ayumu Murakami, Yuichi Yamamoto, Haruhisa Oshida
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Publication number: 20070146824Abstract: An image reading device which is capable of enhancing productivity in reading bound originals, such as a book, a magazine, or a document. A sheet-scanner device implementing the image reading device includes a sheet scanner as a reader part for reading an image on an original. The sheet scanner comprises a sheet-like substrate formed thereon with a light-emitting layer that can emit light spontaneously, and a light-receiving layer on which a plurality of reading pixels are arranged. The sheet scanner is mounted in the sheet-scanner device such that the sheet scanner can be drawn out onto and in from the original.Type: ApplicationFiled: December 21, 2006Publication date: June 28, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke IMAI, Toshifumi ITABASHI, Kiyoshi OYAMA, Takuma KOIZUMI, Ayumu MURAKAMI, Yuichi YAMAMOTO, Haruhisa OSHIDA