Patents by Inventor Takatoshi Nakano
Takatoshi Nakano 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: 8851618Abstract: An ejection complement process is performed during which both a usual ejection failure and a sudden ejection failure can be appropriately coped with, without being accompanied by a frequent maintenance process. In a case wherein sequential printing is not currently being performed, the first detection process is performed with a high accuracy while being accompanied by the maintenance process, and in a case wherein sequential printing is currently being performed, the second detection process that requires only a small process load is performed at a predetermined timing without being accompanied by the maintenance processing. At this time, when the number of ejection failed nozzles detected in the second ejection process has reached a predetermined value or greater, the maintenance process is performed, and only the information for the ejection failed nozzle, detected in the second detection process, is reset.Type: GrantFiled: July 1, 2013Date of Patent: October 7, 2014Assignee: Canon Kabushiki KaishaInventors: Minoru Teshigawara, Yoshiaki Murayama, Susumu Hirosawa, Takatoshi Nakano, Takuya Fukasawa
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Patent number: 8807726Abstract: An inkjet recording apparatus capable of determining an amount of bubbles in an ink flow path and performing suction recovery operation at an appropriate timing is provided. The inkjet recording apparatus includes a recording head including a nozzle for discharging ink and a flow path forming member forming an ink flow path for supplying the ink to the nozzle, a suction unit configured to suck the ink from the recording head, and a temperature detection unit configured to detect a temperature in the recording head. The inkjet recording apparatus includes a control unit configured, based on an amount of gas in the flow path forming member before the ink is filled in the ink flow path, and an amount of gas in equilibrium in the flow path forming member after the ink is filled in the ink flow path, to control the operation of the suction unit.Type: GrantFiled: July 19, 2012Date of Patent: August 19, 2014Assignee: Canon Kabushiki KaishaInventors: Tsukasa Doi, Kiichiro Takahashi, Akiko Maru, Takatoshi Nakano, Genji Inada, Satoshi Kimura
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Patent number: 8794728Abstract: An inkjet recording apparatus includes a recording head, a cap, and a preliminary discharge unit. The recording head can discharge a plurality of types of ink. The cap caps a discharge port face of the recording head. The preliminary discharge unit causes the recording head to execute a preliminary discharge. The preliminary discharge unit changes a preliminary discharge operation according to a length of time during which the discharge port face is capped by the cap.Type: GrantFiled: July 19, 2012Date of Patent: August 5, 2014Assignee: Canon Kabushiki KaishaInventors: Takatoshi Nakano, Kiichiro Takahashi, Tetsuya Edamura, Akiko Maru, Hirokazu Tanaka
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Publication number: 20140204144Abstract: An object of the present invention is to provide a printing apparatus, in which a time required for printing is shortened. The printing apparatus includes a first printing unit that performs printing on a first surface of a sheet by an ink jet system; and a second printing unit that performs printing on a second surface of the sheet by the ink jet system, the second printing unit being disposed on a downstream side of the first printing unit. Moreover, the printing apparatus includes a sheet discharge sensor that detects the sheet to be discharged from the second printing unit. The sheet discharge sensor includes an arm having a rotating member supported thereon, the rotating member being brought into contact with the sheet being conveyed while being rotated.Type: ApplicationFiled: January 21, 2014Publication date: July 24, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ishikawa, Atsushi Saito, Shinya Asano, Takatoshi Nakano, Yutaka Kano
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Patent number: 8770693Abstract: An ink jet printing apparatus and printing method are provided that can, without the addition of a special structure, suppress density imbalance between the print images formed by ink ejected from each of the ejection ports formed on a print head. As for the plurality of ejection ports, one portion of them are established as multiple impact ejection ports that form multiply impacted pixels at which the number of times ink is impacted at the same area is greater than at other pixels of the print area. And, print control is carried out such that more multiply impacted pixels are printed at print areas printed using ejection ports at the ends of the print head than at print areas printed without using ejection ports at the ends of the print head.Type: GrantFiled: July 22, 2011Date of Patent: July 8, 2014Assignee: Canon Kabushiki KaishaInventors: Hirokazu Tanaka, Tetsuya Edamura, Toshiyuki Chikuma, Takatoshi Nakano, Wakako Yamamoto, Kiichiro Takahashi
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Patent number: 8752930Abstract: The amount of ink wastage is reduced, even in a case wherein a predetermined amount of air bubbles has grown in a print head at a specific internal temperature and the growth has been settled, and thereafter the temperature in the print head is increased. A suction-based recovery control method, for an ink jet printing apparatus that includes a print head, a temperature detection unit, and a suction-based recovery unit, comprising: a temperature detection step; a temperature judgment step for judging whether the internal temperature of the print head is higher than a reference temperature that is determined based on internal temperatures of the print head that were previously employed; and a suction-based recovery step for permitting the suction-based recovery unit when it is determined at the temperature judgment step that the internal temperature of the print head is higher by the predetermined number of degrees or greater.Type: GrantFiled: December 12, 2011Date of Patent: June 17, 2014Assignee: Canon Kabushiki KaishaInventors: Tsukasa Doi, Kiichiro Takahashi, Akiko Maru, Takatoshi Nakano, Hiroshi Taira
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Patent number: 8651616Abstract: According to this invention, an inkjet printing apparatus having an arrangement for detecting an amount of remaining ink in an ink tank starts a printing operation in a short time immediately after power-on. If an operation in preceding use is ended without any error at the time of power-off, and no error has occurred even at the time of power-on, the inkjet printing apparatus of this invention starts the printing operation without executing the operation of detecting the amount of remaining ink in the ink tank after power-on.Type: GrantFiled: January 7, 2013Date of Patent: February 18, 2014Assignee: Canon Kabushiki KaishaInventors: Akiko Maru, Kiichiro Takahashi, Tetsuya Edamura, Minoru Teshigawara, Yoshiaki Murayama, Takatoshi Nakano, Hiroshi Taira
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Publication number: 20140043394Abstract: An embodiment of this invention is directed to a printing apparatus capable of providing an output result without a printing density difference between two surfaces in two-sided printing. In the printing apparatus, one subtank is provided for each type of ink. The nozzles of printheads that receive inks supplied from the subtank and are used for printing of the front surface of a printing sheet and printing of the back surface, respectively, are aligned to almost the same level in the vertical direction, thereby making the water head pressures match.Type: ApplicationFiled: July 31, 2013Publication date: February 13, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ishikawa, Atsushi Saito, Shinya Asano, Takatoshi Nakano, Yutaka Kano
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Publication number: 20140009529Abstract: An ejection complement process is performed during which both a usual ejection failure and a sudden ejection failure can be appropriately coped with, without being accompanied by a frequent maintenance process. In a case wherein sequential printing is not currently being performed, the first detection process is performed with a high accuracy while being accompanied by the maintenance process, and in a case wherein sequential printing is currently being performed, the second detection process that requires only a small process load is performed at a predetermined timing without being accompanied by the maintenance processing. At this time, when the number of ejection failed nozzles detected in the second ejection process has reached a predetermined value or greater, the maintenance process is performed, and only the information for the ejection failed nozzle, detected in the second detection process, is reset.Type: ApplicationFiled: July 1, 2013Publication date: January 9, 2014Inventors: Minoru Teshigawara, Yoshiaki Murayama, Susumu Hirosawa, Takatoshi Nakano, Takuya Fukasawa
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Publication number: 20130257976Abstract: To provide an ink jet printing apparatus which can reduce waste ink as much as possible and shorten the amount of time spend on the following wiping process, and a recovery operation method therefor, whereby a first process and a second process are carried out, the first process for discharging ink that does not contribute to the printing from the print head while supplying ink from the ink reservoir portion to the print head by way of the first ink passage connected to one end of the print head, and the second process for discharging ink that does not contribute to the printing from the print head while supplying ink from the ink reservoir portion to the print head by way of the second ink passage connected to the other end of the print head.Type: ApplicationFiled: March 7, 2013Publication date: October 3, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Takatoshi Nakano, Minoru Teshigawara, Susumu Hirosawa, Seiji Suzuki, Kentarou Muro
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Publication number: 20130241997Abstract: The present invention provides an ink jet printing apparatus and an ink jet printing method which are based on the multi-pass printing method using a print head having a plurality of nozzle rows and which enables a reduction in the number of nozzles to be simultaneously driven, allowing ink to be stably ejected. On the basis of the multi-pass printing method of dividing print data into a plurality of pieces by using mask patterns, the mask patterns are offset according to the positional relationship between the plurality of nozzle rows in the print head.Type: ApplicationFiled: May 10, 2013Publication date: September 19, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Minoru Teshigawara, Kiichiro Takahashi, Tetsuya Edamura, Akiko Maru, Yoshiaki Murayama, Takatoshi Nakano, Hiroshi Taira
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Patent number: 8477378Abstract: A region for quantization having a value lower than the value B is assumed as having little influence by Bk data on the pixels in this region. Thus, in order to prioritize the optimization of the granularity at the start of the input of GY data, the LUT having a combination of GY and gy as an input as an input is used to perform separation quantization. On the other hand, since a region having a value equal to or higher than the value B requires the use of Bk data, the LUT having only a combination of Bk and GY as an input as an input is used to perform quantization. As a result, the number of types of pieces of ink data referencing the table can be 2, thus suppressing an increase in the table size.Type: GrantFiled: February 12, 2010Date of Patent: July 2, 2013Assignee: Canon Kabushiki KaishaInventors: Tetsuya Edamura, Kiichiro Takahashi, Minoru Teshigawara, Akiko Maru, Takatoshi Nakano, Hiroshi Taira
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Patent number: 8419152Abstract: A recording apparatus includes a recording unit configured to record a first dot and a second dot having a diameter smaller than that of the first dot on a recording medium, and a scanning unit configured to move the recording unit in a scanning direction. A recording resolution of the second dot in the scanning direction is lower than a recording resolution of the first dot in the scanning direction.Type: GrantFiled: October 2, 2009Date of Patent: April 16, 2013Assignee: Canon Kabushiki KaishaInventors: Tetsuya Edamura, Kiichiro Takahashi, Minoru Teshigawara, Akiko Maru, Yoshiaki Murayama, Takatoshi Nakano
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Patent number: 8403444Abstract: According to the present invention, a recording apparatus is provided which is capable of recording a plurality of patterns, on a recording medium, for detecting an amount of displacement between a recording position of a first discharge port array and a recording position of a second discharge port array in a conveyance direction and acquiring an amount of inclination based on the amount of displacement without conveying the recording medium.Type: GrantFiled: June 4, 2010Date of Patent: March 26, 2013Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Chikuma, Kiichiro Takahashi, Tetsuya Edamura, Hirokazu Tanaka, Takatoshi Nakano, Wakako Yamamoto
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Patent number: 8371673Abstract: According to this invention, an inkjet printing apparatus having an arrangement for detecting an amount of remaining ink in an ink tank starts a printing operation in a short time immediately after power-on. If an operation in preceding use is ended without any error at the time of power-off, and no error has occurred even at the time of power-on, the inkjet printing apparatus of this invention starts the printing operation without executing the operation of detecting the amount of remaining ink in the ink tank after power-on.Type: GrantFiled: April 10, 2008Date of Patent: February 12, 2013Assignee: Canon Kabushiki KaishaInventors: Akiko Maru, Kiichiro Takahashi, Tetsuya Edamura, Minoru Teshigawara, Yoshiaki Murayama, Takatoshi Nakano, Hiroshi Taira
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Patent number: 8366230Abstract: An ink jet printing apparatus is provided that can perform printing without degrading printing quality. In the present invention, correction for a head-to-sheet distance change is performed for both forward printing and backward printing during a multi-path printing operation.Type: GrantFiled: April 1, 2011Date of Patent: February 5, 2013Assignee: Canon Kabushiki KaishaInventors: Hiroshi Taira, Kiichiro Takahashi, Minoru Teshigawara, Tetsuya Edamura, Akiko Maru, Yoshiaki Murayama, Takatoshi Nakano
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Publication number: 20130021399Abstract: An inkjet recording apparatus includes a recording head, a cap, and a preliminary discharge unit. The recording head can discharge a plurality of types of ink. The cap caps a discharge port face of the recording head. The preliminary discharge unit causes the recording head to execute a preliminary discharge. The preliminary discharge unit changes a preliminary discharge operation according to a length of time during which the discharge port face is capped by the cap.Type: ApplicationFiled: July 19, 2012Publication date: January 24, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Takatoshi Nakano, Kiichiro Takahashi, Tetsuya Edamura, Akiko Maru, Hirokazu Tanaka
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Publication number: 20130021397Abstract: An inkjet recording apparatus capable of determining an amount of bubbles in an ink flow path and performing suction recovery operation at an appropriate timing is provided. The inkjet recording apparatus includes a recording head including a nozzle for discharging ink and a flow path forming member forming an ink flow path for supplying the ink to the nozzle, a suction unit configured to suck the ink from the recording head, and a temperature detection unit configured to detect a temperature in the recording head. The inkjet recording apparatus includes a control unit configured, based on an amount of gas in the flow path forming member before the ink is filled in the ink flow path, and an amount of gas in equilibrium in the flow path forming member after the ink is filled in the ink flow path, to control the operation of the suction unit.Type: ApplicationFiled: July 19, 2012Publication date: January 24, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Tsukasa Doi, Kiichiro Takahashi, Akiko Maru, Takatoshi Nakano, Genji Inada, Satoshi Kimura
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Patent number: 8353569Abstract: In an inkjet printing method of performing printing on a printing medium by ejecting inks from a printing head configured to eject chromatic inks and an achromatic ink while moving the printing head, high-quality printing with few boundary stripes produced when the amount of inks is large is realized without complicated control being performed. To this end, print data in a boundary and the vicinity thereof is divided into unit regions, and for each unit region, performed are (A) a first reduction processing which determines a hue of the unit region based on amounts of the chromatic inks, and reduces the amount of chromatic inks applied to the unit region according to the determined hue; and (B) a second reduction processing which reduces an amount of achromatic ink based on the amount of achromatic ink applied to the unit region.Type: GrantFiled: December 14, 2009Date of Patent: January 15, 2013Assignee: Canon Kabushiki KaishaInventors: Kiichiro Takahashi, Minoru Teshigawara, Tetsuya Edamura, Akiko Maru, Takatoshi Nakano, Hiroshi Taira
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Patent number: 8328311Abstract: Degradation in image quality due to disturbance in landing positions of satellites is suppressed. When scanning and printing with a printing head which has a first nozzle array ejecting relatively large ejection amount of ink, a second nozzle array arranged on one side of the first nozzle array in a scan direction and a third nozzle array arranged on the other side of the first nozzle array in the scan direction, the second and third nozzle arrays ejecting a relatively small ejection amount of ink with the same color, a printing rate of one of the second and third nozzle arrays located at the front side in the scan direction is controlled lower than that of the other located at the back side.Type: GrantFiled: August 6, 2010Date of Patent: December 11, 2012Assignee: Canon Kabushiki KaishaInventors: Takatoshi Nakano, Kiichiro Takahashi, Tetsuya Edamura, Toshiyuki Chikuma, Hirokazu Tanaka, Wakako Yamamoto