Patents by Inventor Jun Nakazato
Jun Nakazato 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: 11740571Abstract: An image forming apparatus including a developing unit with a developing container configured to contain a developer including a toner and a carrier, and configured to develop the electrostatic latent image by using the developer in the developing container. A sensor, which is provided on an outer wall of the developing container, is configured to output a pulse signal that changes in frequency depending on a toner concentration of the developer in the developing container. A controller is provided to control supply of the toner to the developing unit by detecting the toner concentration based on the time required for the pulse number to reach a predetermined count number.Type: GrantFiled: March 2, 2021Date of Patent: August 29, 2023Assignee: Canon Kabushiki KaishaInventor: Jun Nakazato
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Publication number: 20210271186Abstract: An image forming apparatus including a developing unit with a developing container configured to contain a developer including a toner and a carrier, and configured to develop the electrostatic latent image by using the developer in the developing container. A sensor, which is provided on an outer wall of the developing container, is configured to output a pulse signal that changes in frequency depending on a toner concentration of the developer in the developing container. A controller is provided to control supply of the toner to the developing unit by detecting the toner concentration based on the time required for the pulse number to reach a predetermined count number.Type: ApplicationFiled: March 2, 2021Publication date: September 2, 2021Inventor: Jun Nakazato
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Patent number: 10935915Abstract: An image forming apparatus controls a first image forming unit and a second image forming unit to form a plurality of pattern images. The plurality of pattern images includes a first pattern image formed by the first image forming unit, a second pattern image formed by the second image forming unit, a plurality of third pattern images that are formed by the first image forming unit and have different tones from one another, and a plurality of fourth pattern images that are formed by the second image forming unit and have different tones from one another. The image forming apparatus obtains data that has been output from a sensor and is related to the plurality of pattern images, and generates the conversion condition based on the data.Type: GrantFiled: November 27, 2019Date of Patent: March 2, 2021Assignee: CANON KABUSHIKI KAISHAInventor: Jun Nakazato
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Publication number: 20200183313Abstract: An image forming apparatus controls a first image forming unit and a second image forming unit to form a plurality of pattern images. The plurality of pattern images includes a first pattern image formed by the first image forming unit, a second pattern image formed by the second image forming unit, a plurality of third pattern images that are formed by the first image forming unit and have different tones from one another, and a plurality of fourth pattern images that are formed by the second image forming unit and have different tones from one another. The image forming apparatus obtains data that has been output from a sensor and is related to the plurality of pattern images, and generates the conversion condition based on the data.Type: ApplicationFiled: November 27, 2019Publication date: June 11, 2020Inventor: Jun Nakazato
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Patent number: 10372066Abstract: An image forming apparatus includes an image forming unit having a photosensitive member on which an image is formed and a developer bearing member, an intermediate transfer member onto which the image is transferred, a transfer member forming a nip portion for transfer of the image on the photosensitive member onto the intermediate transfer member, a transfer unit transferring the image on the intermediate transfer member onto the sheet, a motor rotating the photosensitive member, a motor control unit controlling the motor so the rotation speed of the photosensitive member is a target rotation speed, and a controller that acquires first and second load information of the photosensitive member in a first period where developer bearing member rotates and a second period where developer bearing member is stopped, and controls whether or not to change the target rotation speed based on the first and second load information.Type: GrantFiled: July 10, 2017Date of Patent: August 6, 2019Assignee: Canon Kabushiki KaishaInventors: Koichi Taniguchi, Jun Nakazato, Jiro Shirakata, Shusuke Miura, Kana Oshima
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Patent number: 10353332Abstract: An image forming apparatus includes an image forming unit configured to form an image, a reference member, a sensor including a substrate, a light-emitting element provided on the substrate, a light-receiving element provided on the substrate, and a blocking member provided between the light-emitting element and the light-receiving element on the substrate, the sensor configured to output an output value based on a light reception result of the light-receiving element, a memory storing data related to a relationship between a measurement condition and an offset value, and a controller configured to control the sensor based on a plurality of measurement conditions to acquire an output value corresponding to a measurement result of reflected light from the reference member, and determine a measurement condition for measuring the image based on the acquired output value and the data stored in the memory.Type: GrantFiled: December 4, 2017Date of Patent: July 16, 2019Assignee: CANON KABUSHIKI KAISHAInventor: Jun Nakazato
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Publication number: 20180173145Abstract: An image forming apparatus includes an image forming unit configured to form an image, a reference member, a sensor including a substrate, a light-emitting element provided on the substrate, a light-receiving element provided on the substrate, and a blocking member provided between the light-emitting element and the light-receiving element on the substrate, the sensor configured to output an output value based on a light reception result of the light-receiving element, a memory storing data related to a relationship between a measurement condition and an offset value, and a controller configured to control the sensor based on a plurality of measurement conditions to acquire an output value corresponding to a measurement result of reflected light from the reference member, and determine a measurement condition for measuring the image based on the acquired output value and the data stored in the memory.Type: ApplicationFiled: December 4, 2017Publication date: June 21, 2018Inventor: Jun Nakazato
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Publication number: 20180017903Abstract: An image forming apparatus includes an image forming unit having a photosensitive member on which an image is formed and a developer bearing member, an intermediate transfer member onto which the image is transferred, a transfer member forming a nip portion for transfer of the image on the photosensitive member onto the intermediate transfer member, a transfer unit transferring the image on the intermediate transfer member onto the sheet, a motor rotating the photosensitive member, a motor control unit controlling the motor so the rotation speed of the photosensitive member is a target rotation speed, and a controller that acquires first and second load information of the photosensitive member in a first period where developer bearing member rotates and a second period where developer bearing member is stopped, and controls whether or not to change the target rotation speed based on the first and second load information.Type: ApplicationFiled: July 10, 2017Publication date: January 18, 2018Inventors: Koichi Taniguchi, Jun Nakazato, Jiro Shirakata, Shusuke Miura, Kana Oshima
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Patent number: 8867961Abstract: An image forming apparatus includes a storage unit configured to store a first tilted position of a roller at which meandering of the belt can be prevented in a state that the belt abuts on the image bearing member and a second tilted position of the roller at which meandering of the belt can be prevented in a state that the belt is separated from the image bearing member, and a control unit configured to move the roller to the first tilted position if the belt abuts on the image bearing member while the belt is conveyed and move the roller to the second tilted position if the abutment of the belt on the image bearing member is cancelled while the belt is conveyed.Type: GrantFiled: May 30, 2012Date of Patent: October 21, 2014Assignee: Canon Kabushiki KaishaInventor: Jun Nakazato
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Patent number: 8565634Abstract: An image forming apparatus capable of ensuring a sufficient difference between amounts of light reflected from a base such as a transfer material and from a toner pattern in the detection of the toner pattern for registration correction control by a reflective optical sensor. The image forming apparatus includes a pattern generator for generating a toner pattern, a pattern detection sensor for detecting the toner pattern formed on the intermediate transfer belt, a pattern density decider for determining the density of the toner pattern that makes the amount of light received by the sensor in detection of the toner pattern equal to or less than a predetermined value.Type: GrantFiled: October 2, 2007Date of Patent: October 22, 2013Assignee: Canon Kabushiki KaishaInventors: Jun Nakazato, Hirokazu Kodama, Satoru Takezawa
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Patent number: 8538284Abstract: An image forming apparatus capable of improving the reliability of intermediate transfer belt shift control and attaining a high quality image. The image forming apparatus includes an intermediate transfer belt onto which a toner image is transferred and formed, a shift position detecting sensor that detects a shift position of the belt, a shift control roller that changes the shift position of the belt, and an angle adjustment cam and an angle adjustment arm that correct an inclination angle of the roller. An amount of correction for the inclination angle is calculated by an ASIC based on the belt shift position detected by the sensor. In a Kf multiplier and a Kr multiplier, coefficient values used for the calculation of the amount of correction for the inclination angle can variably be changed independently for respective directions of control for the roller inclination angle.Type: GrantFiled: September 28, 2009Date of Patent: September 17, 2013Assignee: Canon Kabushiki KaishaInventor: Jun Nakazato
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Publication number: 20120321328Abstract: An image forming apparatus includes a storage unit configured to store a first tilted position of a roller at which meandering of the belt can be prevented in a state that the belt abuts on the image bearing member and a second tilted position of the roller at which meandering of the belt can be prevented in a state that the belt is separated from the image bearing member, and a control unit configured to move the roller to the first tilted position if the belt abuts on the image bearing member while the belt is conveyed and move the roller to the second tilted position if the abutment of the belt on the image bearing member is cancelled while the belt is conveyed.Type: ApplicationFiled: May 30, 2012Publication date: December 20, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Jun Nakazato
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Patent number: 8326194Abstract: An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member, the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks.Type: GrantFiled: May 14, 2010Date of Patent: December 4, 2012Assignee: Canon Kabushiki KaishaInventors: Jun Nakagaki, Jiro Shirakata, Yoritsugu Maeda, Satoshi Atarashi, Yukihiro Fujiwara, Dai Kanai, Jun Nakazato
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Patent number: 8244157Abstract: An image-forming apparatus includes an image-bearing member configured to bear an image, a transfer belt to which the image on the image-bearing member is transferred and configured to transfer the image onto a sheet, a first drive unit configured to drive the image-bearing member to rotate, a second drive unit configured to drive the transfer belt to rotate via a speed reduction member interposed therebetween, a detection unit configured to detect a circumferential speed of the transfer belt, and a control unit configured to control the first drive unit in accordance with the circumferential speed of the transfer belt detected by the detection unit.Type: GrantFiled: December 14, 2009Date of Patent: August 14, 2012Assignee: Canon Kabushiki KaishaInventors: Jiro Shirakata, Yoritsugu Maeda, Satoshi Atarashi, Yukihiro Fujiwara, Dai Kanai, Jun Nakagaki, Jun Nakazato
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Patent number: 8175505Abstract: An image forming apparatus includes a pattern forming unit which forms a light amount adjustment pattern on an image carrier belt, a light amount control unit which controls the amount of light irradiating the image carrier belt and pattern, a detection sensor which detects reflected light amounts from the image carrier belt and pattern with respect to the irradiating light amount and stores the detection results in a storage unit, a calculation unit which calculates the correspondence between the irradiating light amount and the reflected light amounts from the image carrier belt and pattern on the basis of the detection results and stores the calculation results in the storage unit, and a light amount decision unit which decides, on the basis of the calculation results, a light amount at which the difference between the reflected light amounts from the image carrier belt and pattern exhibits a value set in advance.Type: GrantFiled: June 24, 2011Date of Patent: May 8, 2012Assignee: Canon Kabushiki KaishaInventors: Satoru Takezawa, Jun Nakazato, Hirokazu Kodama
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Patent number: 8095044Abstract: A rotary member apparatus includes a main drive unit configured to apply a driving torque to a photosensitive drum through a drive transfer unit, a torque limiter configured to limit the driving torque transmitted from the main drive unit to the photosensitive drum, a compensation drive unit configured to apply a torque for adjusting an angular velocity of the photosensitive drum, an encoder configured to detect the angular velocity of the photosensitive drum, and a compensation drive controller configured to control the torque applied by the compensation drive unit on the basis of a detection result obtained by the encoder.Type: GrantFiled: March 27, 2009Date of Patent: January 10, 2012Assignee: Canon Kabushiki KaishaInventors: Yoritsugu Maeda, Jiro Shirakata, Jun Nakagaki, Satoshi Atarashi, Yukihiro Fujiwara, Dai Kanai, Jun Nakazato
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Publication number: 20110255908Abstract: An image forming apparatus includes a pattern forming unit which forms a light amount adjustment pattern on an image carrier belt, a light amount control unit which controls the amount of light irradiating the image carrier belt and pattern, a detection sensor which detects reflected light amounts from the image carrier belt and pattern with respect to the irradiating light amount and stores the detection results in a storage unit, a calculation unit which calculates the correspondence between the irradiating light amount and the reflected light amounts from the image carrier belt and pattern on the basis of the detection results and stores the calculation results in the storage unit, and a light amount decision unit which decides, on the basis of the calculation results, a light amount at which the difference between the reflected light amounts from the image carrier belt and pattern exhibits a value set in advance.Type: ApplicationFiled: June 24, 2011Publication date: October 20, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Satoru TAKEZAWA, Jun NAKAZATO, Hirokazu KODAMA
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Patent number: 7991336Abstract: An image forming apparatus includes a pattern forming unit which forms a light amount adjustment pattern on an image carrier belt, a light amount control unit which controls the amount of light irradiating the image carrier belt and pattern, a detection sensor which detects reflected light amounts from the image carrier belt and pattern with respect to the irradiating light amount and stores the detection results in a storage unit, a calculation unit which calculates the correspondence between the irradiating light amount and the reflected light amounts from the image carrier belt and pattern on the basis of the detection results and stores the calculation results in the storage unit, and a light amount decision unit which decides, on the basis of the calculation results, a light amount at which the difference between the reflected light amounts from the image carrier belt and pattern exhibits a value set in advance.Type: GrantFiled: August 3, 2009Date of Patent: August 2, 2011Assignee: Canon Kabushiki KaishaInventors: Satoru Takezawa, Jun Nakazato, Hirokazu Kodama
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Publication number: 20100303513Abstract: An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line-like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member; the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks.Type: ApplicationFiled: May 14, 2010Publication date: December 2, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Jun Nakagaki, Jiro Shirakata, Yoritsugu Maeda, Satoshi Atarashi, Yukihiro Fujiwara, Dai Kanai, Jun Nakazato
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Publication number: 20100158551Abstract: An image-forming apparatus includes an image-bearing member configured to bear an image, a transfer belt to which the image on the image-bearing member is transferred and configured to transfer the image onto a sheet, a first drive unit configured to drive the image-bearing member to rotate, a second drive unit configured to drive the transfer belt to rotate via a speed reduction member interposed therebetween, a detection unit configured to detect a circumferential speed of the transfer belt, and a control unit configured to control the first drive unit in accordance with the circumferential speed of the transfer belt detected by the detection unit.Type: ApplicationFiled: December 14, 2009Publication date: June 24, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Jiro Shirakata, Yoritsugu Maeda, Satoshi Atarashi, Yukihiro Fujiwara, Dai Kanai, Jun Nakagaki, Jun Nakazato