Having Detection Of Toner (e.g., Patch) Patents (Class 399/49)
  • Patent number: 10739718
    Abstract: In a case where a total value of the number of images to be formed specified by an input job and a count value of a counter before the number of images to be formed according to the job is counted is included in a predetermined range including a predetermined number of images, a cleaning mechanism is caused to operate after formation of images according to the job is completed, and a cleaning process is executed.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: August 11, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takako Suzuki
  • Patent number: 10732554
    Abstract: An image forming apparatus configured to form an image on a sheet includes an image bearing member configured to rotate in a predetermined direction, and an image forming unit configured to form an image on the image bearing member based on image data converted based on a conversion condition. A controller of the image forming apparatus controls the image forming unit to form a plurality of measurement images different in density along the predetermined direction of the image bearing member, detects the plurality of measurement images, and generates the conversion condition based on detection results of the plurality of measurement images. The controller controls the image forming unit to form the plurality of measurement images in a dispersed manner in terms of positions of the plurality of measurement images on the image bearing member in accordance with periodic unevenness that occurs in the measurement images.
    Type: Grant
    Filed: May 9, 2019
    Date of Patent: August 4, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Nobuhiko Zaima
  • Patent number: 10721369
    Abstract: An image forming apparatus includes an image forming unit that forms an image based on image data; and a control unit that controls the image forming unit, the control unit is capable of controlling an image quality adjustment operation in the image forming unit, and in formation of an image on which foil stamping is performed, selection of no performance of an image quality adjustment or/and selection of performance of an image quality adjustment for foil stamping is enabled.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: July 21, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Tetsu Kawasaki
  • Patent number: 10698346
    Abstract: An idler roller as at least one of a plurality of support rollers for stretching an intermediate transfer belt is a metal roller having a groove formed on a metal surface. A primary transfer roller is a metal roller having a metal surface with a smaller maximum surface height than the idler roller.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: June 30, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenta Matsuzaki
  • Patent number: 10656583
    Abstract: An image forming system includes a first image forming apparatus and a second image forming apparatus. The first image forming apparatus includes an image forming unit that at least forms an image of a first color. The second image forming apparatus includes an image forming unit that forms an image of a second color different from a color of an image formed by the image forming unit of the first image forming apparatus, and also includes an image forming unit that forms an image of the first color. The first image forming apparatus and the second image forming apparatus use the first color to form positional-adjustment images for adjusting image formation positions between the first image forming apparatus and the second image forming apparatus.
    Type: Grant
    Filed: April 26, 2018
    Date of Patent: May 19, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Osamu Goto, Yoshiki Matsuzaki
  • Patent number: 10652433
    Abstract: An image forming apparatus that includes an image forming unit that forms an image on a transfer medium, a conveying unit that conveys the transfer medium, a first image detection unit that detects the image formed by the image forming unit on the transfer medium; and a control unit that controls the forming of the image and the conveying of the transfer medium, and receives detection results from the first image detection unit and a second image detection unit, wherein the control unit determines whether the image detected by the first image detection unit has image quality higher than or equal to predetermined quality and calibrates the first image detection unit based on the detection result from the first image detection unit and the detection result from the second image detection unit for the image having the image quality higher than or equal to predetermined quality.
    Type: Grant
    Filed: July 9, 2019
    Date of Patent: May 12, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Mitsunori Nakamura
  • Patent number: 10627762
    Abstract: An image forming apparatus which forms a toner image on an image carrier based on image formation data, and transfers the toner image onto a sheet having an unevenness on a surface and forms an image, the image forming apparatus including a hardware processor which detects a parameter value regarding a charging amount of a toner that forms the toner image, sets a size of a dot of the toner image according to the detected parameter value, and generates the image formation data of the dot of the set size.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: April 21, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Takashi Kawanago, Satoshi Nishida, Takeshi Maeyama, Toshiki Hayami, Tomo Kitada, Daisuke Murakami
  • Patent number: 10620577
    Abstract: An apparatus converts image data based on a conversion condition, forms an image using a developer, measures the developer, and measures humidity. The apparatus determines a first density of an image when a mode of the apparatus changes from a power saving mode in which the apparatus cannot form an image to a normal mode in which the apparatus can form an image, from values measured, based on a first determination condition, determines a second density of an image when the apparatus has formed images on a predetermined number of sheets in the normal mode, from values measured, based on a second determination condition that is different from the first determination condition, and generates the conversion condition based on the first density and the second density.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: April 14, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Taichi Takemura
  • Patent number: 10613452
    Abstract: An image forming apparatus includes: an image forming part that forms a toner image on a recording medium; and a hardware processor that controls the image forming part, wherein the image forming part includes an image carrier, the hardware processor executes: a first adjustment process of adjusting the image forming part with use of a first image formation condition determined in accordance with a toner adhesion amount at a plurality of points in a first direction on the image carrier; and a second adjustment process of adjusting the image forming part with use of a second image formation condition determined in accordance with a toner adhesion amount at one point in a first direction on the image carrier, the image carrier rotates as a recording medium is conveyed, the first direction is a direction intersecting with a rotational direction of the image carrier.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: April 7, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Shigeki Naiki, Teppei Kunihisa, Soh Hirota, Hironori Akashi, Kenji Tsuru
  • Patent number: 10606204
    Abstract: An optical sensor includes a light source; and an optical detector detecting intensity of light that is reflected by a recording medium, the light from the light source and irradiated onto the recording medium. Further, when an incident angle of the light incident to the recording medium from the light source relative to a normal line of the recording medium is given as ?1, a formula 75°??1?85° is satisfied.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: March 31, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Toshihiro Ishii, Yoshihiro Oba, Fumikazu Hoshi, Satoru Sugawara
  • Patent number: 10585376
    Abstract: An image forming apparatus includes a controller configured to control a first and a second voltage applied to a transfer device when transferring an image to a first and a second side of a recording material, respectively. The controller controls a mode that outputs a test chart on which at least one of a plurality of first test images for adjusting the first voltage and a plurality of second test images for adjusting the second voltage is formed. In a case of forming the second test images on a second side of the test chart, and before forming the second test images, the controller forms a plurality of predetermined toner images under a same image forming condition on a first side of the test chart so that the predetermined toner images are formed on a plurality of predetermined areas overlapping each area where the second test images are to be formed.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: March 10, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsuomi Murayama, Haruhiko Omata
  • Patent number: 10534299
    Abstract: The image forming apparatus determines, based on a determination value calculated by a calculating unit, a light amount of reflection light from a first position on an image bearing member from light amounts of reflection light beams from a second position and a third position on the image bearing member where a patch image is not formed in a state where the patch image is formed at the first position on the image bearing member, or determines the light amount of reflection light from the first position on the image bearing member by detecting the light amount of reflection light from the first position on the image bearing member with a detecting unit in a state where the patch image is not formed at the first position on the image bearing member.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: January 14, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masaki Kobayashi
  • Patent number: 10514644
    Abstract: An image forming apparatus includes a carrying part, a transfer member that transfers a developer image, a first detection part that detects an adhering object that adheres to the carrying member, generating a first detection result, and a control part that performs a carrying control in which the carrying operation of the developer image by the carrying member is controlled based on the first detection result by the first detection part.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: December 24, 2019
    Assignee: Oki Data Corporation
    Inventor: Yoshiki Matsuzaki
  • Patent number: 10503110
    Abstract: An image forming apparatus includes a latent image bearer configured to bear a latent image and a developing device configured to develop the latent image on the latent image bearer with developer. The developing device includes a plurality of developer bearers configured to bear the developer. The image forming apparatus further includes a rotation position detector configured to detect a rotation position of at least one of the plurality of developer bearers, a common power source configured to apply a developing bias to each of the plurality of developer bearers, and circuitry configured to cause the common power source to periodically vary the developing bias. The circuitry is configured to cause the plurality of developer bearers to rotate in a same rotation period; and vary an output value of the developing bias in a same period as the rotation period based on a detection result by the rotation position detector.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: December 10, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Hideki Kimura
  • Patent number: 10503109
    Abstract: A toner detection unit (optical sensor) includes a first light receiving element configured to receive specular reflection light of first irradiating light, and a second light receiving element configured to receive diffused reflection light of second irradiating light, and a separation component configured to separate irradiating light emitted from an LED into the first and second irradiating light. A housing forms a first opening through which the first irradiating light and the second irradiating light pass and the diffused reflection light to be received by the second light receiving element passes, and a second opening through which the specular reflection light to be received by the first light receiving element passes.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: December 10, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazushi Ino, Chihiro Nagura, Takuya Mukaibara
  • Patent number: 10492304
    Abstract: The circuit substrate includes at least two lands formed on a substrate, wherein one electrode is to be mounted on the at least two lands, an electronic part having electrodes, one of the electrodes is soldered on the at least two lands with solders whose amounts are adjusted by a metal mask having at least two opening parts, positions of the at least two opening parts corresponding to the at least two lands when the solders are applied and melted, areas of the at least two opening parts being different with each other, wherein a height of one of the solders is different from a height of the other of the solders according to the difference of the areas of the at least two opening parts of the metal mask, whereby the electronic part is mounted on the circuit substrate in an inclined state.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masayuki Sakai, Takahiro Yoneyama, Fumiyuki Yamatsuka
  • Patent number: 10481539
    Abstract: Disclosed is an image forming apparatus that is capable of performing a first image forming mode that performs image formation at a first peripheral speed ratio representing a ratio of a peripheral speed of a developer bearing member to a peripheral speed of an image bearing member and a second image forming mode that performs the image formation at a second peripheral speed ratio different from the first peripheral speed ratio, and that detects an amount of a developer consumed in the image formation, based on an estimate of the amount of the developer consumed by one pixel and the number of pixels at a part at which the developer is consumed. The estimate of the amount of the developer consumed by the one pixel in the first image forming mode is different from that in the second image forming mode.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: November 19, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuichiro Hirata, Daisuke Baba
  • Patent number: 10474056
    Abstract: An image forming apparatus includes a latent image bearer; a writing device configured to write a latent image onto the latent image bearer; a detection device configured to detect, at a plurality of positions, a density of a toner image obtained through development of the latent image; and a controller configured to correct a writing intensity of the writing device to correct an uneven density based on detection values of the detection device. The controller determines whether each of the detection values is pass or fail. In response to a determination that a detection value is fail, the controller corrects the wiring intensity based on another detection value determined to be pass at a position different from a position at which the detection value is determined to be fail, instead of correcting the writing intensity based on the detection value determined to be fail.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: November 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuuichiroh Uematsu, Satoshi Kaneko, Terumichi Ochi, Shuji Hirai
  • Patent number: 10466633
    Abstract: A control unit controls a transfer power source in such a manner that a current value detected by a detection unit is a predetermined value while a transfer medium is not held in a transfer portion, and the control unit sets a transfer voltage based on a voltage value applied from the transfer power source to a transfer member. Then, the transfer voltage is applied from the transfer power source to a transfer roller after the leading edge of the transfer medium in the conveyance direction for the transfer medium is held in the transfer portion and before the leading edge is held in a fixing portion. While the transfer voltage is applied, the control unit sets a voltage to be applied from the transfer power source to the transfer member based on the value of current detected by the detection unit.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: November 5, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Jun Hara, Yusuke Shimizu, Kenichi Iida
  • Patent number: 10432824
    Abstract: An image forming apparatus that includes an image forming unit that forms an image on a transfer medium, a conveying unit that conveys the transfer medium, a first image detection unit that detects the image formed by the image forming unit on the transfer medium; and a control unit that controls the forming of the image and the conveying of the transfer medium, and receives detection results from the first image detection unit and a second image detection unit, wherein the control unit determines whether the image detected by the first image detection unit has image quality higher than or equal to predetermined quality and calibrates the first image detection unit based on the detection result from the first image detection unit and the detection result from the second image detection unit for the image having the image quality higher than or equal to predetermined quality.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: October 1, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventor: Mitsunori Nakamura
  • Patent number: 10401763
    Abstract: An image forming apparatus includes an image forming unit and a controller. The image forming unit includes a latent image bearer, a charger to charge the latent image bearer, an exposure device to expose a latent image on the surface of the latent image bearer, and a developing device to develop the latent image with a developer. The controller executes an image forming process, a first fluctuation control that cyclically changes a developing bias supplied to the developing device based on predetermined first pattern data, and a second fluctuation control that cyclically changes a charging bias supplied to the charger based on predetermined second pattern data, in parallel. The controller executes a determination process to determine whether the controller executes the first fluctuation control. When the controller determines not to execute the first fluctuation control, the controller determines not to execute the second fluctuation control, too.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: September 3, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Satoshi Kaneko, Shuji Hirai, Yuuichiroh Uematsu, Terumichi Ochi
  • Patent number: 10401771
    Abstract: An image forming apparatus, to which an external measurement device is connectable, including an image processor, a printer, a sensor arranged on a conveyance path, a controller that performs first processing for generating color processing condition based on a measurement result of measurement images of the sensor, the measurement images including a first measurement image and a second measurement image, wherein a length of the second measurement image in a conveyance direction is longer than a length of the first measurement image in the conveyance direction, and performs second processing for generating conversion condition, based on a measurement result of predetermined measurement images by the sensor and measurement data output from an external measurement device, wherein a length of a predetermined measurement image included in the predetermined measurement images in the conveyance direction is longer than the length of the first measurement image in the conveyance direction.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: September 3, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Takaaki Yano
  • Patent number: 10394175
    Abstract: An image forming apparatus that is capable of finding density of an output image with high accuracy even if reflectance of an image bearing member varies. A conversion unit converts image data based on a conversion condition. An image forming unit forms an image based on the converted image data. A measurement unit measures irregular reflection light from a measurement image on the image bearing member. A controller controls the image forming unit to form measurement images, controls the measurement unit to measure irregular reflection light from an area on the image bearing member where the measurement images are not formed, controls the measurement unit to measure the irregular reflection light from the measurement images, selects a measurement result from among measurement results of the measurement images based on the measurement result of the area, and generates the conversion condition based on the selected measurement result.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: August 27, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Nobuhiko Zaima
  • Patent number: 10338492
    Abstract: An image forming apparatus includes a rotatable image bearing member, a developing device including a developing carrying member and configured to develop an electrostatic image formed on the image bearing member with developer, an electrostatic capacity detecting portion configured to detect information on electrostatic capacity between the developer carrying member and the image bearing member, and a toner content detecting portion configured to detect information on a toner content of the developer accommodated in a developing container. On the basis of the detected electrostatic capacity and the detected toner content, a controller controls a driving speed at which the developer carrying member is rotationally driven.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: July 2, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hideaki Suzuki
  • Patent number: 10310429
    Abstract: An image forming apparatus includes a sensor and a shutter to cover a window for the sensor. The shutter includes a detection hole to uncover the window and a cover portion to cover it. In an opening position of the shutter, the window and the hole are opposed to each other, and in a closing position of the shutter, the window and the cover portion are opposed to each other. A holder for the sensor includes a side wall opposed to a side of the sensor remote from a sheet feeding path and extended in a widthwise direction. As viewed in a horizontal direction perpendicular to the belt, the side wall is provided with a first area overlapping the hole in the closing position and a second area overlapping the window in the closing position. The first area is below the shutter and lower than the second area.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: June 4, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Tanabe
  • Patent number: 10303076
    Abstract: According to one example, there is provided an electrostatic printer. The printer includes a photoconductor member, an imaging unit to generate a latent electrostatic image on the photoconductor member, a developer unit including a colored toner, the developer unit to develop a colored toner image on the photoconductor member using an associated base developer voltage, and a controller. The controller is to obtain image data including color separation data representing a variant of the colored toner, to control the imaging unit to generate a latent electrostatic image on the photoconductor member in accordance with the obtained color separation data, to determine a variant developer voltage corresponding to the variant of the colored toner, and to control the developer unit to develop a toner image on the photoconductor member using the variant developer voltage to develop a toner image corresponding to the variant of the colored toner.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: May 28, 2019
    Assignee: HP Indigo B.V.
    Inventors: Peter Nedelin, Mark Sandler
  • Patent number: 10281860
    Abstract: An image forming apparatus includes optical sensor units provided opposed to an image bearing member; light blockers provided between the image bearing member and the optical sensor units, respectively, the blockers being movable between locking and exposing positions, respectively; calibration members provided where the light is incident when the blockers are in the blocking positions, respectively, the calibration members calibrating data acquired by the optical sensor units; a movable link connected with the blockers; a switching portion for switching the blockers between the exposing and blocking positions; and a positioning portion for determining the blocking position, the positioning portion being disposed at a position where at least one of the blockers is contacted to the positioning portion when the blockers are switched from the exposing positions to the blocking positions.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: May 7, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kentaro Yamana
  • Patent number: 10284747
    Abstract: An image forming apparatus includes an image forming unit configured to form an image by using a developer, and a controller configured to control the image forming unit to form a test image on the sheet, acquire information related to the test image, and correct, based on the information, a position on the sheet, wherein the test image is used to detect positional deviation, wherein the controller performs first processing in which the image forming unit forms the test image and a first pattern image, and second processing in which the image forming unit forms the test image and a second pattern image, wherein the image forming unit forms the first pattern image so that an adhesion amount of the developer becomes a first amount, and the second pattern image so that an adhesion amount of the developer becomes a second amount that is larger than the first amount.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: May 7, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Munetaka Sakata
  • Patent number: 10274883
    Abstract: Cross-track spacing variations for a plurality of printer subsystems of an electrophotographic printing system are characterized by printing first and second test pattern and capturing image of the printed test patterns. The first and second test patterns are chosen so that the printed test patterns respond differently to cross-track spacing variations in different printer subsystems. The first and second digitized test patterns are analyzed to determine parameters that characterize an attribute of the printed test pattern as a function of cross-track position. A first defect model is used to determine estimated cross-track spacing variations for one or more printer subsystem as a function of the determined parameters.
    Type: Grant
    Filed: February 2, 2018
    Date of Patent: April 30, 2019
    Assignee: EASTMAN KODAK COMPANY
    Inventors: Chung-Hui Kuo, Mark C. Zaretsky
  • Patent number: 10274885
    Abstract: An image forming apparatus includes an image bearing member, a developer bearing member, an updating device to update toner consumption based on a number of dots corresponding to laser irradiation by which toner is consumed, and an alerting device to alert an alarm concerning a residual amount of the toner based on toner consumption updated by the updating device. Image formation is performed in a first mode at a first peripheral speed ratio representing a ratio of a peripheral speed of the developer bearing member to a peripheral speed of the image bearing member, and in a second mode at a second peripheral speed ratio, which is greater than the first peripheral speed ratio. The alerting device alerts the alarm based on a total number of dots, which is smaller as an operation frequency of the second mode and becomes higher in an operation frequency of the first mode.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: April 30, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuichiro Hirata, Daisuke Baba
  • Patent number: 10248062
    Abstract: An electrophotographic imaging device having a method of printing which includes setting a default toner density for printing; developing a first toned image having the default toner density; printing the first toned image on a first page of a print job; and before printing a second page of a print job, determining whether a duty cycle state of a photoconductive member in the imaging device has changed, and upon a positive determination, developing a second toned image having a toner density derived from the default toner density and printing the second toned image on the second page.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: April 2, 2019
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Douglas Anthony Able, Michael Brian Bacalieri, Andrew Gil Montaño Desabelle, Gary Scott Overall, Marvin Aliviado Rodriguez
  • Patent number: 10248054
    Abstract: A fuser includes: a rotating body; a roller configured to convey a sheet in a conveyance direction; a pair of bearings supporting the roller; one side frame made of a resin, supporting one of the pair of bearings; another side frame supporting the other of the pair of bearings, and arranged at a distance from the one side frame in the axial direction; and a center frame made of a metal, including a main-body portion arranged on an opposite side of the rotating body with respect to the roller. One end portion in the axial direction of the main-body portion includes a first fixing portion which is fixed to the one side frame, and a second fixing portion which is arranged on an upstream side of the first fixing portion in the conveyance direction, and is fixed to the one side frame.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: April 2, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Tatsuo Ogasawara
  • Patent number: 10241437
    Abstract: An exposure device irradiates a light beam to the photoconductor drum and thereby forms an electrostatic latent image on a photoconductor drum. A developing roller causes toner to adhere to the electrostatic latent image and thereby develops a toner image. A development bias power supply circuit applies a development bias to the developing roller. A direct current detection circuit detects a direct current that flows between the development bias power supply circuit and the developing roller. A control circuit (a) causes the exposure device to form an electrostatic latent image of an adjustment patch for toner density adjustment, (b) measures a value of the direct current at a timing when the developing roller causes the toner to adhere to the electrostatic latent image of the adjustment patch, and (c) performs the toner density adjustment on the basis of the measured value of the direct current.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: March 26, 2019
    Assignee: Kyocera Document Solutions, Inc.
    Inventor: Kensuke Fujihara
  • Patent number: 10234797
    Abstract: An image forming apparatus includes an image bearing member, a transfer body, a bias applying portion, a current detection unit, and a control unit. The control unit is configured to change the upper limit voltage based on the current detected by the current detection unit in a state where a test bias is applied to the transfer portion during a non-image forming period, and a voltage of the test bias being applied.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: March 19, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shozo Aiba
  • Patent number: 10228050
    Abstract: A cam device includes a cam and a driver. The cam includes a cam face that is gradually distanced from a rotation center of the cam over a range greater than half a round of the cam. The driver rotates the cam in a first direction and in a second direction opposite the first direction.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: March 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroaki Nieda
  • Patent number: 10222719
    Abstract: A method of electro-photographic printing includes applying a background voltage to a photo imaging plate using a charge roller that moves relative to the photo imaging plate, and varying the applied background voltage as the roller moves relative to the photo imaging plate, wherein the background voltage is varied in a region of the photo imaging plate where no ink is to be transferred.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: March 5, 2019
    Assignee: HP INDIGO B.V.
    Inventors: Shmuel Borenstain, Michael Kokotov
  • Patent number: 10209646
    Abstract: An image forming apparatus includes: an image carrier that rotates while carrying a toner image; an image former that forms the toner image; a transfer roller that transfers the toner image to a recording medium; and a bias voltage applier that applies a voltage to the transfer roller, wherein the image former forms transfer images and forms a patch image with toner between a first transfer image and a second transfer image, and the bias voltage applier applies a first voltage having a polarity opposite to a charge polarity of the toner to the transfer roller, applies a second voltage having the polarity opposite to the charge polarity of the toner and larger than the first voltage to the transfer roller, and applies a third voltage having the polarity opposite to the charge polarity of the toner and smaller than the second voltage to the transfer roller.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: February 19, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kazuyoshi Ota, Hiroaki Umemoto, Futoshi Okazaki, Hidetoshi Noguchi, Masanori Kawada
  • Patent number: 10191437
    Abstract: There is provided an image forming apparatus including: an intermediate transfer belt; a photosensitive drum; a primary transfer member; a secondary transfer member; a first backup member; a first power supply electrically connected to the primary transfer member and to the secondary transfer member; and a first resistor electrically connected to the first power supply and to the primary transfer member. A first current route, in which the first resistor, the primary transfer member, and the photosensitive drum are connected in series in that order, is connected to the first power supply and to a basis potential. A second current route, in which the secondary transfer member and the first backup member are connected in series, is connected to the first power supply and to the basis potential. The first current route is connected in parallel to the second current route.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: January 29, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Toshio Furukawa
  • Patent number: 10185269
    Abstract: An image forming apparatus includes: a photoconductor drum; an optical scanner, having a light source, configured to scan the photoconductor drum with light to form a latent image; a developer configured to develop an image, based on the latent image; a cycle detector configured to detect a rotation cycle of the photoconductor drum, to produce a cyclic signal indicative of the rotation cycle; a density detector configured to detect density of the image; a measurer configured to measure the rotation cycle at each rotation, based on the cyclic signal; a generator configured to generate, based on the density, a correcting value for correcting intensity of the light, the correcting value having a correction cycle based on a measurement result of the measurer; and an adjuster configured to adjust the correction cycle based on the rotation cycle measured at each rotation, so that the correction cycle matches the rotation cycle.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: January 22, 2019
    Assignee: Ricoh Company Ltd.
    Inventor: Muneaki Iwata
  • Patent number: 10183517
    Abstract: The embodiments of the disclosure provide a correction method for laser marking, comprising: obtaining an image to be marked; in a preset coordinate system of a laser marker, determining a fracture region and a non-fracture region of the image to be marked; correcting the non-fracture region of the image to be marked by using a preset correcting formula; correcting the fracture region of the image to be marked by using a preset standard correction value and a preset weighted coefficient corresponding to coordinate position; and marking with the corrected image to be marked. According to the disclosure, by providing weighted correction for the mark points within the fracture region according to finely divided coordinate positions, the distortion correction for the fracture region can be completed without measuring deviation values of marking region with high density and high precision.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: January 22, 2019
    Assignee: MAXPHOTONICS CORPORATION
    Inventors: Jun Song, Yixin Jiang, Gaofeng He, Feng Jiang
  • Patent number: 10185267
    Abstract: An integrated sensor has a density detection sensor, a sensor board, and a potential sensor pattern. The density detection sensor detects the density of a toner image formed on a toner image carrying member. On the sensor board, the density detection sensor is mounted. The potential sensor pattern is provided on the sensor board, and detects the potential of the toner image.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: January 22, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Haruki Shoji
  • Patent number: 10180648
    Abstract: A sensor includes a light emitter and a photodetector. The light emitter outputs light with which a toner pattern or a surface material of an image carrier is irradiated. The photodetector receives reflection light from the toner pattern or the surface material. The sensor light intensity control unit provides a control voltage to the light emitter and thereby controls light intensity of the light emitter. The density determining unit determines a toner density on the basis of output of the photodetector. Further, the density determining unit (a) determines as a correction parameter a first-order coefficient of the control voltage of the light emitter for an output voltage of the photodetector corresponding to reflection light from the surface material, (b) determines a correction amount corresponding to the correction parameter and the toner density, and (c) corrects the toner density on the basis of the correction amount.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: January 15, 2019
    Assignee: Kyocera Document Solutions, Inc.
    Inventors: Hiroki Tanaka, Kenichi Hayashi
  • Patent number: 10168637
    Abstract: An image forming apparatus includes a photoconductor, an optical scanner, a developing device, a density detector, and an exposure corrector. The photoconductor is rotatable in a direction of rotation. The optical scanner includes a light source, and drives the light source to form a latent image on a surface of the photoconductor. The developing device develops the latent image to form an image. The density detector detects variation in density of the image in the direction of rotation of the photoconductor. The exposure corrector generates exposure correction data for the optical scanner to reduce the variation in density. The exposure corrector adjusts output of the optical scanner according to the exposure correction data at a time different from a time when the exposure corrector updates the exposure correction data.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: January 1, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventor: Muneaki Iwata
  • Patent number: 10168634
    Abstract: An image forming apparatus includes a CPU configured to change a parameter value used to control a developer bearing amount and form a plurality of patches for different parameter values changed, and a color sensor configured to measure the plurality of patches thereby acquiring color information thereof. The CPU detects, from values of color information of the plurality of patches, a value of the color information at which a change greater than or equal to a predetermined threshold value occurs, and the CPU sets a parameter used in forming an image based on the detected value of color information.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: January 1, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Akihiko Uchiyama
  • Patent number: 10133227
    Abstract: An image forming apparatus forms test patches, and detects the adhesion amounts of toner in the test patches. The image forming apparatus calculates an approximate equation approximates the relationship between a developing bias and an adhesion amount of toner, based on the developing biases when the test patches were formed and the adhesion amounts of toner of the test patches. Distance between test patches is {(2n?1)/2} times of value L, where n is a natural number and L is a length of the photo conductor drum in a circumferential direction. The accuracy of toner adhesion amount control can be improved, and image density can be stabilized.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: November 20, 2018
    Assignee: Konica Minolta, Inc.
    Inventor: Teppei Kunihisa
  • Patent number: 10126697
    Abstract: An image forming apparatus includes a control unit configured to be able to perform density adjustment control of forming a reference toner image for image density control on an image bearing member and changing a target value of a toner density based on an image density of the reference toner image detected by an image density detection unit. The control unit limits the target value of the toner density within a predetermined range, and changes frequency of execution of the density adjustment control based on the fact that the target value of the toner density is placed at a boundary value.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: November 13, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Noriyuki Okada
  • Patent number: 10126694
    Abstract: An image forming apparatus includes a converting unit, a plurality of image forming units, a scanning unit, a first generating unit, a second generating unit, an intermediate transfer member, a measuring unit, and a controller configured to, after the first generating unit generates an image forming condition, control the plurality of image forming units to form a measurement image, control the measuring unit to measure the measurement image, and control whether to control the second generating unit to generate a conversion condition or not on the basis of a result of the measurement performed on a previous measurement image and a result of the measurement performed on a current measurement image.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: November 13, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Nobuhiko Zaima
  • Patent number: 10095146
    Abstract: An image formation apparatus includes an image bearing member on which an electrostatic latent image is formed and a developing agent bearing member configured to carry a developer used to develop the electrostatic latent image formed on the image bearing member. The image formation apparatus forms an image by using the electrostatic latent image formed on the image bearing member. The image formation apparatus further includes an obtaining unit configured to obtain the information about a rotation speed of the image bearing member and a rotation speed of the developing agent bearing member; a determination unit configured to determine, according to the obtained information, a color conversion table used to transfer and record the input image data; and an image formation unit configured to convert a signal of the input image data according to the determined color conversion table and form an image with the converted signal value.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: October 9, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Michihiko Yamada
  • Patent number: 10088790
    Abstract: An image forming apparatus comprises a sensor which emits light with a spot diameter serving as a predetermined size to a pattern for position detection formed on a transfer medium conveyed by a conveyance section, and outputs a read signal corresponding to reflected light of the emitted light; a processing circuit which generates a differential signal obtained by differentiating the read signal output by the sensor, and outputs a signal obtained through an exclusive OR of the read signal and the differential signal obtained by differentiating the read signal; and a control section configured to specify a position at which a image forming section forms a image on the basis of the signal output by the processing circuit.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: October 2, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Sueo Ueno
  • Patent number: 10082746
    Abstract: In an image forming apparatus, a controller (a) determines a bright potential of a photoconductor drum at calibration, (b) adjusts a development bias and thereby determines as an intermediate reference development bias value a value of the development bias so that a toner density based on an output of a reflection-type optical sensor is equal to an intermediate reference density lower than a target density, (c) determines as an intermediate reference effective potential a difference between the intermediate reference development bias value and the bright potential at calibration, and (d) determines a development bias value corresponding to the target density by linear interpolation based on the intermediate reference effective potential and a virtual zero density effective potential. The virtual zero density effective potential is a difference between a development bias and a bright potential of the photoconductor drum when a transmission density is virtually zero.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: September 25, 2018
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Kenichi Hayashi, Hiroki Tanaka