Patents by Inventor Chikanobu Ikeda
Chikanobu Ikeda 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: 6893106Abstract: A printing apparatus and an ink-discharge status detection method which perform appropriate print control by detecting discharge failure with a simple construction, without reducing the printing speed. The apparatus, to which the method is applied, performs test ink discharge from a part of nozzles of a printhead while scanning the printhead, and detects ink discharge statuses of the nozzles of the printhead by using a photosensor in an area between the home position of the printhead and a position outside of an effective printing area. In next detection, nozzles different from those used in the previous test ink discharge are used for performing test ink discharge, and discharge statuses are detected. Discharge statuses of all the nozzles are detected in forward and backward scannings or a plurality of scannings.Type: GrantFiled: October 16, 2002Date of Patent: May 17, 2005Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Kuriyama, Yasushi Miura, Masashi Shimizu, Chikanobu Ikeda, Shigeru Watanabe
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Patent number: 6659584Abstract: A printing apparatus and a print control method which detect a defective printing element in operation failure status while reciprocate-scanning a printhead, and perform appropriate print control such as complementary printing on an unprinted portion by the defective printing element, without reducing the printing speed. An apparatus, to which the method is applied, has a photosensor 8, to detect ink discharge statuses of a plurality of nozzles of a printhead 5, which is provided between a home position of the printhead and the outside of an effective printing area where image printing is to be made. While the printhead 5 is scanned, test ink discharge is performed at the position of the photosensor 8, and the ink discharge statuses of the nozzles are detected by the photosensor 8. A corrector 123 analyzes the operation statuses of the nozzles of the printhead 5 based on the results of detection in a real time manner. A CPU 25 performs print control based on the results of analysis.Type: GrantFiled: December 18, 1998Date of Patent: December 9, 2003Assignee: Canon Kabushiki KaishaInventors: Yasushi Miura, Hiroyuki Miyake, Hiroyuki Kuriyama, Masashi Shimizu, Chikanobu Ikeda, Shigeru Watanabe
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Publication number: 20030142161Abstract: A printing apparatus and a print control method which detect a defective printing element in operation failure status while reciprocate-scanning a printhead, and perform appropriate print control such as complementary printing on an unprinted portion by the defective printing element, without reducing the printing speed. An apparatus, to which the method is applied, has a photosensor 8, to detect ink discharge statuses of a plurality of nozzles of a printhead 5, which is provided between a home position of the printhead and the outside of an effective printing area where image printing is to be made. While the printhead 5 is scanned, test ink discharge is performed at the position of the photosensor 8, and the ink discharge statuses of the nozzles are detected by the photosensor 8. A corrector 123 analyzes the operation statuses of the nozzles of the printhead 5 based on the results of detection in a real time manner. A CPU 25 performs print control based on the results of analysis.Type: ApplicationFiled: December 18, 1998Publication date: July 31, 2003Inventors: YASUSHI MIURA, HIROYUKI MIYAKE, HIROYUKI KURIYAMA, MASASHI SHIMIZU, CHIKANOBU IKEDA, SHIGERU WATANABE
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Patent number: 6527358Abstract: A printing apparatus and an ink-discharge status detection method which perform appropriate print control by detecting discharge failure with a simple construction, without reducing the printing speed. The apparatus, to which the method is applied, performs test ink discharge from a part of nozzles of a printhead while scanning the printhead, and detects ink discharge statuses of the nozzles of the printhead by using a photosensor in an area between the home position of the printhead and a position outside of an effective printing area. In next detection, nozzles different from those used in the previous test ink discharge are used for performing test ink discharge, and discharge statuses are detected. Discharge statuses of all the nozzles are detected in forward and backward scannings or a plurality of scannings.Type: GrantFiled: December 18, 1998Date of Patent: March 4, 2003Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Kuriyama, Yasushi Miura, Masashi Shimizu, Chikanobu Ikeda, Shigeru Watanabe
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Publication number: 20030030688Abstract: A printing apparatus and an ink-discharge status detection method which perform appropriate print control by detecting discharge failure with a simple construction, without reducing the printing speed. The apparatus, to which the method is applied, performs test ink discharge from a part of nozzles of a printhead while scanning the printhead, and detects ink discharge statuses of the nozzles of the printhead by using a photosensor in an area between the home position of the printhead and a position outside of an effective printing area. In next detection, nozzles different from those used in the previous test ink discharge are used for performing test ink discharge, and discharge statuses are detected. Discharge statuses of all the nozzles are detected in forward and backward scannings or a plurality of scannings.Type: ApplicationFiled: October 16, 2002Publication date: February 13, 2003Applicant: Canon Kabushiki KaishaInventors: Hiroyuki Kuriyama, Yasushi Miura, Masashi Shimizu, Chikanobu Ikeda, Shigeru Watanabe
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Patent number: 6488348Abstract: In an ink-jet printing apparatus, upon turning on the power source of the printing apparatus, a stirring operation of ink in the main tank is performed for a given period of time, and during subsequent printing operation, the stirring operation in the main tank is performed for the given period at every predetermined elapsed time period. By this, the printing operation for a long period can be performed employing ink having a water insoluble dye without causing a problem of admixing of bubble or so forth caused by stirring of the ink in the main tank.Type: GrantFiled: August 10, 1999Date of Patent: December 3, 2002Assignee: Canon Kabushiki KaishaInventors: Yasushi Miura, Katsuhiro Watanabe, Makoto Aoki, Toshiaki Mabuchi, Tomoyuki Kawana, Takeshi Irizawa, Chikanobu Ikeda
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Publication number: 20020167555Abstract: In an ink-jet printing apparatus, upon ON-set of power source of the printing apparatus, stirring operation of ink in the main tank is performed for a given period of time, during subsequent printing operation, the stirring operation in the main tank is performed for the given period per over predetermined elapsed time T0. By this, printing operation for a long period can be performed employing ink having water insoluble dye without causing a problem of admixing of bubble or so forth to be caused by stirring of the ink in the main tank.Type: ApplicationFiled: August 10, 1999Publication date: November 14, 2002Inventors: YASUSHI MIURA, KATSUHIRO WATANABE, MAKOTO AOKI, TOSHIAKI MABUCHI, TOMOYUKI KAWANA, TAKESHI IRIZAWA, CHIKANOBU IKEDA
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Publication number: 20020140756Abstract: A printing apparatus and an ink-discharge status detection method which perform appropriate print control by detecting discharge failure with a simple construction, without reducing the printing speed. The apparatus, to which the method is applied, performs test ink discharge from a part of nozzles of a printhead while scanning the printhead, and detects ink discharge statuses of the nozzles of the printhead by using a photosensor in an area between the home position of the printhead and a position outside of an effective printing area. In next detection, nozzles different from those used in the previous test ink discharge are used for performing test ink discharge, and discharge statuses are detected. Discharge statuses of all the nozzles are detected in forward and backward scannings or a plurality of scannings.Type: ApplicationFiled: December 18, 1998Publication date: October 3, 2002Inventors: HIROYUKI KURIYAMA, YASUSHI MIURA, MASASHI SHIMIZU, CHIKANOBU IKEDA, SHIGERU WATANABE
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Patent number: 6183074Abstract: An ink-jet printing apparatus restricts fluctuation of the printing density due to coagulation and settling of a coloring agent in a water based ink, in which a water insoluble coloring agent or a coloring agent having low water solubility is dispersed. By this, movement of the ink caused due to difference of specific gravity caused by coagulation of the coloring agent or so forth in an upper passage to a lower passage can be restricted to successfully prevent increasing of difference of ink density.Type: GrantFiled: July 14, 1999Date of Patent: February 6, 2001Assignee: Canon Kabushiki KaishaInventors: Yoshiko Miyashita, Tokihide Ebata, Makoto Aoki, Chikanobu Ikeda
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Patent number: 5988782Abstract: In an ink-jet printing apparatus, upon turning on the power source of the printing apparatus, a stirring operation of ink in the main tank is performed for a given period of time, and during sequent printing operation, the stirring operation in the main tank is performed for the give period at every predetermined elapsed time. By this, the printing operation for a long period can be performed employing ink having a water insoluble dye without causing a problem of admixing of bubble or so forth caused by stirring of the ink in the main tank.Type: GrantFiled: April 3, 1996Date of Patent: November 23, 1999Assignee: Canon Kabushiki KaishaInventors: Yasushi Miura, Katsuhiro Watanabe, Makoto Aoki, Toshiaki Mabuchi, Tomoyuki Kawana, Takeshi Irizawa, Chikanobu Ikeda
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Patent number: 5963236Abstract: An ink-jet printing apparatus restricts fluctuation of the printing density due to coagulation and settle out coloring agent employing a water based ink, in which a water insoluble coloring agent or the coloring agent having low water solubility is dispersed. By this, movement of the ink caused due to difference of specific gravity caused by coagulation of the coloring agent or so forth in an upper passage, to a lower passage can be restricted to successfully prevent increasing of difference of ink density.Type: GrantFiled: April 15, 1996Date of Patent: October 5, 1999Assignee: Canon Kabushiki KaishaInventors: Yoshiko Miyashita, Tokihide Ebata, Makoto Aoki, Chikanobu Ikeda