Patents by Inventor Kiyoharu Kakomura
Kiyoharu Kakomura 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: 20180017923Abstract: A controller of an image forming apparatus calculates a density difference between a measurement result of a toner image having the highest density formed on a photosensitive drum, which is obtained by an image density sensor, and the highest density of a density target. When the density difference falls within a predetermined range, the controller generates a tone correction table based on a density value of a first toner image formed with a plurality of densities including the highest density, and sets, based on the density difference, an exposure amount of laser light to be applied to the photosensitive drum by an exposure device. When the density difference falls out of the predetermined range, the controller generates the tone correction table based on a density value of a second toner image having a larger number of tone levels than that of the first toner image.Type: ApplicationFiled: July 7, 2017Publication date: January 18, 2018Inventors: Yuya Ohta, Noriaki Matsui, Nozomi Kumakura, Naoka Omura, Junichiro Nakabayashi, Takayuki Inoue, Kiyoharu Kakomura
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Publication number: 20180004147Abstract: The present disclosure provides an image forming apparatus capable of easily performing jam processing. When an occurrence of a jam of a sheet which is conveyed on a conveying path is detected, the image forming apparatus displays a jam processing display screen which guides processing in accordance with a position where the jam has occurred. After the processing in accordance with the jam processing display screen is performed, if a state of the jam remains unchanged, the image forming apparatus performs forced feeding which forcibly conveys the sheet to a predetermined position. The image forming apparatus displays the jam processing display screen urging to perform processing in accordance with the position of the sheet after the sheet is forcibly conveyed.Type: ApplicationFiled: June 16, 2017Publication date: January 4, 2018Inventors: Noriaki MATSUI, Nozomi Kumakura, Naoka Omura, Junichiro Nakabayashi, Takayuki Inoue, Kiyoharu Kakomura, Yuya Ohta
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Patent number: 9696673Abstract: The image forming apparatus controls each laser scanner by setting the writing start timing in the sub-scanning direction to form the color registration correction image for correcting color registration at position according to the detection result of the image detection sensor. When forming the image on the sheet, the image forming apparatus sets the writing start timing in the sub-scanning direction according to the detection result of the image detection sensor and the amount of skew of the sheet to control each laser scanner. When forming the density detection toner image for correcting the density, the image forming apparatus sets the writing start timing in the sub-scanning direction to form the image at a position shifted by a pixel unit from the image forming position on the sheet.Type: GrantFiled: May 13, 2015Date of Patent: July 4, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Naoka Omura, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Yuya Ohta
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Publication number: 20170052468Abstract: An image forming apparatus includes a first image forming unit configured to form a first image in a chromatic color, a second image forming unit configured to form a second image in black, an intermediate transfer member, a sensor, a first adjustment unit configured to adjust the image forming position for the black based on an adjustment value, a second adjustment unit configured to adjust image forming position based on an adjustment condition, and a generation unit configured to generate the adjustment condition. The generation unit generates a first adjustment condition based on a user instruction relating to a first test image having chromatic color on a sheet input from the input unit. The generation unit generates a second adjustment condition based on the reading result of the second test image having black on a sheet from a reading device.Type: ApplicationFiled: August 11, 2016Publication date: February 23, 2017Inventors: Naoka Omura, Kunio Takane, Noriaki Matsui, Takuya Hayakawa, Kiyoharu Kakomura, Takayuki Inoue
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Patent number: 9360786Abstract: A detection unit detects a color registration pattern formed on a transfer member. A first correction unit detects an amount of color misregistration, relative to a forming position of a color pattern having a reference color, of a forming position of a color pattern having another color and determines an offset value for adjusting a write start timing of the other color. A measuring unit measures the inclination of the transfer member. A second correction unit determines, according to the inclination, an offset value for adjusting the write start timing of each of the plurality of image forming units and for adjusting, relative to the write start timing of a reference color, the write start timing of another color. The reference color for the first correction unit is different from the reference color for the second correction unit.Type: GrantFiled: May 13, 2015Date of Patent: June 7, 2016Assignee: Canon Kabushiki KaishaInventors: Yuya Ohta, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Naoka Omura
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Patent number: 9310711Abstract: An image forming apparatus determines a time length of a non-image-forming period in which image formation is not performed, the non-image-forming period being from when image formation on one recording sheet ends to when image formation on the next recording sheet starts, and based on the determined time length, decides the number of times of executing measurement (BD interval measurement) of a generation timing difference between detection signals corresponding to light beams emitted from two light emitting elements. The image forming apparatus executes the decided number of times of BD interval measurement and calculates an average value of the resultant measurement values.Type: GrantFiled: March 27, 2015Date of Patent: April 12, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Yuya Ohta, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Naoka Omura
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Publication number: 20150338809Abstract: The image forming apparatus controls each laser scanner by setting the writing start timing in the sub-scanning direction to form the color registration correction image for correcting color registration at position according to the detection result of the image detection sensor. When forming the image on the sheet, the image forming apparatus sets the writing start timing in the sub-scanning direction according to the detection result of the image detection sensor and the amount of skew of the sheet to control each laser scanner. When forming the density detection toner image for correcting the density, the image forming apparatus sets the writing start timing in the sub-scanning direction to form the image at a position shifted by a pixel unit from the image forming position on the sheet.Type: ApplicationFiled: May 13, 2015Publication date: November 26, 2015Inventors: Naoka Omura, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Yuya Ohta
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Publication number: 20150338760Abstract: A detection unit detects a color registration pattern formed on a transfer member. A first correction unit detects an amount of color misregistration, relative to a forming position of a color pattern having a reference color, of a forming position of a color pattern having another color and determines an offset value for adjusting a write start timing of the other color. A measuring unit measures the inclination of the transfer member. A second correction unit determines, according to the inclination, an offset value for adjusting the write start timing of each of the plurality of image forming units and for adjusting, relative to the write start timing of a reference color, the write start timing of another color. The reference color for the first correction unit is different from the reference color for the second correction unit.Type: ApplicationFiled: May 13, 2015Publication date: November 26, 2015Inventors: Yuya Ohta, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Naoka Omura
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Publication number: 20150286158Abstract: An image forming apparatus determines a time length of a non-image-forming period in which image formation is not performed, the non-image-forming period being from when image formation on one recording sheet ends to when image formation on the next recording sheet starts, and based on the determined time length, decides the number of times of executing measurement (BD interval measurement) of a generation timing difference between detection signals corresponding to light beams emitted from two light emitting elements. The image forming apparatus executes the decided number of times of BD interval measurement and calculates an average value of the resultant measurement values.Type: ApplicationFiled: March 27, 2015Publication date: October 8, 2015Inventors: Yuya Ohta, Kuniyasu Kimura, Takuya Hayakawa, Kiyoharu Kakomura, Seita Inoue, Naoka Omura
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Patent number: 8055179Abstract: An image forming apparatus capable of efficiently performing an image forming processing even in a case where a post-processing apparatus performs a post-processing during a both-sides printing. A first time period needed by a first both-sides image forming processing and a second time period needed by a second both-sides image forming processing are computed in a case where a post-processing unit performs a post-processing on a recording sheet formed images on both sides thereof. The first time period and the second time period is compared, and any one of the first both-sides image forming processing and the second both-sides image forming processing is selected based on the comparison.Type: GrantFiled: November 19, 2008Date of Patent: November 8, 2011Assignee: Canon Kabushiki KaishaInventors: Hidenori Sunada, Kiyoshi Okamoto, Mitsuhiko Sato, Yuichiro Maeda, Kiyoharu Kakomura
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Patent number: 7983584Abstract: An image forming apparatus in which surplus tabbed sheets produced in one set of output can be utilized for the next set of output, without requiring a user to perform a laborious task. In the image forming apparatus, a CPU calculates the number of tabbed sheet groups which will be used for one set of image formation and the number of tabbed sheets which will be used from among the last tabbed sheet group. Among the last tabbed sheet group, surplus tabbed sheets which will be left unused in the one set of image formation are determined. If the number of tabbed sheets is equal to or less than the number of the surplus tabbed sheets, at least one of the surplus tabbed sheets is used to carry out two sets of image formation.Type: GrantFiled: October 5, 2008Date of Patent: July 19, 2011Assignee: Canon Kabushiki KaishaInventors: Kiyoshi Okamoto, Mitsuhiko Sato, Yuichiro Maeda, Kiyoharu Kakomura, Hidenori Sunada
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Publication number: 20090129806Abstract: An image forming apparatus capable of efficiently performing an image forming processing even in a case where a post-processing apparatus performs a post-processing during a both-sides printing. A first time period needed by a first both-sides image forming processing and a second time period needed by a second both-sides image forming processing are computed in a case where a post-processing unit performs a post-processing on a recording sheet formed images on both sides thereof. The first time period and the second time period is compared, and any one of the first both-sides image forming processing and the second both-sides image forming processing is selected based on the comparison.Type: ApplicationFiled: November 19, 2008Publication date: May 21, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Hidenori Sunada, Kiyoshi Okamoto, Mitsuhiko Sato, Yuichiro Maeda, Kiyoharu Kakomura
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Publication number: 20090092406Abstract: An image forming apparatus in which surplus tabbed sheets produced in one set of output can be utilized for the next set of output, without requiring a user to perform a laborious task. In the image forming apparatus, a CPU calculates the number of tabbed sheet groups which will be used for one set of image formation and the number of tabbed sheets which will be used from among the last tabbed sheet group. Among the last tabbed sheet group, surplus tabbed sheets which will be left unused in the one set of image formation are determined. If the number of tabbed sheets is equal to or less than the number of the surplus tabbed sheets, at least one of the surplus tabbed sheets is used to carry out two sets of image formation.Type: ApplicationFiled: October 5, 2008Publication date: April 9, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Kiyoshi OKAMOTO, Mitsuhiko SATO, Yuichiro MAEDA, Kiyoharu KAKOMURA, Hidenori SUNADA