Patents by Inventor Soh Hirota

Soh Hirota 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).

  • Patent number: 10782640
    Abstract: An image forming device that forms a toner image on a surface of a photoreceptor, transfers the toner image to a recording material and outputs a printed recording material, includes: an intermediate transfer body that primarily transfers the toner image on the photoreceptor and secondarily transfers the toner image to the recording material; a cleaner that removes a toner left on the surface of the photoreceptor; a patch forming unit that forms a toner patch between two adjacent toner images when multiple toner images are continuously formed on the surface of the photoreceptor; a concentration detector that detects concentration of the toner patch primarily transferred to the intermediate transfer body from the photoreceptor; and a patch adjuster that adjusts toner amount used for forming the toner patch based on a result detected by the concentration detector.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: September 22, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hironori Akashi, Soh Hirota, Shigeki Naiki
  • 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
  • Publication number: 20200081384
    Abstract: An image forming device that forms a toner image on a surface of a photoreceptor, transfers the toner image to a recording material and outputs, comprises: an intermediate transfer body that primarily transfers the toner image on the photoreceptor and secondarily transfers the toner image to the recording material; a cleaner that removes a toner left on the surface of the photoreceptor; a patch forming unit that forms a toner patch between two adjacent toner images when multiple toner images are continuously formed on the surface of the photoreceptor; a concentration detector that detects concentration of the toner patch primarily transferred to the intermediate transfer body from the photoreceptor; and a patch adjuster that adjusts toner amount used for forming the toner patch based on a result detected by the concentration detector.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 12, 2020
    Inventors: Hironori AKASHI, Soh HIROTA, Shigeki NAIKI
  • Publication number: 20190278197
    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: Application
    Filed: February 5, 2019
    Publication date: September 12, 2019
    Inventors: SHIGEKI NAIKI, TEPPEI KUNIHISA, SOH HIROTA, HIRONORI AKASHI, KENJI TSURU
  • Patent number: 9008524
    Abstract: For each of N imaginary regions divided at predetermined intervals in the direction of the rotation shaft of a developer roller (12), the amount of toner consumed when an image is formed is previously calculated. Then, the same amount of toner as a toner consumption amount calculated for each imaginary region is supplied to a development device (2) earlier by a time in which the toner supplied from a toner hopper (5) is transported to each imaginary region than at the time of the development. Thus, it is possible to maintain a toner concentration within the development device within a predetermined range without the toner being dispersed and an image formation speed being reduced even if an image having a high print rate is formed.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: April 14, 2015
    Assignee: Konica Minolta, Inc.
    Inventors: Yusuke Mamiya, Soh Hirota, Hironori Akashi, Yoshinori Tsutsumi, Kanako Kibihara
  • Publication number: 20140147132
    Abstract: An image forming apparatus is provided which can execute an image stabilization operation and which includes: a determination portion that determines whether or not the image stabilization operation can be executed when a constituent member of the apparatus is replaced or when a consumable item is supplied; and an image stabilization control portion that executes the image stabilization operation when the determination portion determines that the image stabilization operation can he executed.
    Type: Application
    Filed: November 20, 2013
    Publication date: May 29, 2014
    Applicant: Konica Minolta , Inc.
    Inventors: Masahiro KOUZAKI, Mitsuru OBARA, Soh HIROTA, Yoshinori TSUTSUMI
  • Publication number: 20130322896
    Abstract: For each of N imaginary regions divided at predetermined intervals in the direction of the rotation shaft of a developer roller (12), the amount of toner consumed when an image is formed is previously calculated. Then, the same amount of toner as a toner consumption amount calculated for each imaginary region is supplied to a development device (2) earlier by a time in which the toner supplied from a toner hopper (5) is transported to each imaginary region than at the time of the development. Thus, it is possible to maintain a toner concentration within the development device within a predetermined range without the toner being dispersed and an image formation speed being reduced even if an image having a high print rate is formed.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 5, 2013
    Inventors: Yusuke Mamiya, Soh Hirota, Hironori Akashi, Yoshinori Tsutsumi, Kanako Kibihara
  • Patent number: 8412063
    Abstract: An image forming apparatus has an image bearing member that moves at a specified speed; a toner pattern forming section for forming toner patterns of a specified type on the image bearing member under specified image forming conditions; a toner pattern detection member for detecting the toner patterns formed on the image bearing member; a toner amount varying section for varying a target amount of toner to adhere to the toner patterns; and a control section that calculates a toner adherence amount and a toner adherence position from detection results outputted from the toner pattern detection member and that performs image stabilization control to adjust the image forming conditions based on the calculation results. In the image stabilization control, the control section uses detection results of the same toner patterns both to calculate the toner adherence amount and to calculate the toner adherence position.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: April 2, 2013
    Assignee: Konica Minolta Business Techologies, Inc.
    Inventors: Mitsuru Obara, Soh Hirota, Hironori Akashi, Takashi Harashima, Kanako Kibihara
  • Patent number: 8260160
    Abstract: A color image forming apparatus having photosensitive members; developing devices for developing electrostatic latent images formed on the photosensitive members into toner images with developers comprising toner and carriers; toner concentration sensors for detecting toner concentrations of the developers in the respective developing devices; a toner image bearing member for bearing the toner images temporarily; a toner adherence amount sensor for detecting toner adherence amounts of the toner images held on the image bearing member; and a controller for calculating, with respect to the developing devices, individual optimal developing bias voltage ranges within which a target toner adherence amount can be achieved while the toner concentrations of the developers are within a predetermined toner concentration range from a lower limit to an upper limit, so as to specify a common optimal developing bias voltage range that are commonly suitable for all the developing devices to achieve the target toner adherenc
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: September 4, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Hironori Akashi, Soh Hirota, Mitsuru Obara, Takashi Harashima, Kanako Kibihara
  • Patent number: 8112007
    Abstract: The present invention aims to provide an image forming apparatus and the like that perform a highly-accurate tone correction in a relatively short time and includes the following: a pattern former, with use of each image forming unit, on a sheet, forming tone patches in the main or sub scanning direction (41k,c,y,m) and aligning markers, which indicate positions of the tone patches, in the same direction as the tone patches (42k,c,y,m); a pattern reader reading the sheet with the tone patches and markers formed thereon; a coordinate determiner determining coordinates of the tone patches in the direction of the aligned tone patches based on the read markers (42k,c,y,m); a density determiner determining densities of the tone patches (41k,c,y,m) read based on the determined coordinates; and an updating part updating the tone correction table based on relationships between the determined densities and tone levels.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: February 7, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tetsuya Sakai, Soh Hirota, Masahiro Kouzaki, Takashi Harashima, Kazuomi Sakatani
  • Patent number: 8098406
    Abstract: An image forming apparatus performs dither processing on image data to form an image subjected to pseudo-halftone processing. The image forming apparatus includes a dither processing unit that performs dither processing on image data, and a dither pattern generation unit that generates a dither matrix for use in the dither processing, in accordance with an output gradation level. The dither matrix has a size of M×N pixels, and has a plurality of halftone dots arranged in a predetermined pattern in accordance with the output gradation level in order to represent a gradation of each color. The plurality of halftone dots are arranged in the dither matrix such that the halftone dots corresponding to at least two colors are substantially identical in color area ratio to each other in the dither matrix irrespective of a relative position with respective to the colors.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: January 17, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Soh Hirota, Osamu Yamada, Toshio Tsuboi
  • Patent number: 8090281
    Abstract: A tandem-type color image forming apparatus forms a toner pattern and toner markers on an intermediate transfer member. Tone levels in the toner pattern vary in a sub scanning direction, and the toner markers which are a same color with the tone pattern each oppose, in a main scanning direction, a different one of the tone level portions in the toner pattern, each tone level portion representing a different one of the tone levels. Positions of the toner markers in the sub scanning direction are determined to detect densities in the toner pattern corresponding to the determined positions. Tone of image data is corrected in an image formation based on a relationship between the densities and the tone levels corresponding to the determined positions.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: January 3, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Soh Hirota, Tetsuya Sakai, Takashi Harashima, Kazuomi Sakatani, Masahiro Kouzaki
  • Patent number: 7983507
    Abstract: An image forming device for forming an image on an image carrier using a different grayscale reproduction method for each of two or more different attributes contained in portions of the image. The image forming device forms a different standard pattern in one-to-one correspondence with each different attribute contained in the image portions, using a grayscale reproduction method used for reproducing image portions containing the attribute, detects density of each standard pattern formed by the standard pattern forming unit, sets, for each different attribute, a condition for correcting grayscale of the image portions containing the attribute, in accordance with the detected density, and corrects grayscale of the image portions in accordance with each condition set by the correction condition setting unit.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: July 19, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Masahiro Kouzaki, Tetsuya Sakai, Kazuomi Sakatani, Soh Hirota, Takashi Harashima
  • Publication number: 20110044705
    Abstract: A color image forming apparatus having photosensitive members; developing devices for developing electrostatic latent images formed on the photosensitive members into toner images with developers comprising toner and carriers; toner concentration sensors for detecting toner concentrations of the developers in the respective developing devices; a toner image bearing member for bearing the toner images temporarily; a toner adherence amount sensor for detecting toner adherence amounts of the toner images held on the image bearing member; and a controller for calculating, with respect to the developing devices, individual optimal developing bias voltage ranges within which a target toner adherence amount can be achieved while the toner concentrations of the developers are within a predetermined toner concentration range from a lower limit to an upper limit, so as to specify a common optimal developing bias voltage range that are commonly suitable for all the developing devices to achieve the target toner adherenc
    Type: Application
    Filed: July 23, 2010
    Publication date: February 24, 2011
    Applicant: Konica Minolta Business Technologies
    Inventors: Hironori AKASHI, Soh Hirota, Mitsuru Obara, Takashi Harashima, Kanako Kibihara
  • Publication number: 20110020022
    Abstract: An image forming apparatus has an image bearing member that moves at a specified speed; a toner pattern forming section for forming toner patterns of a specified type on the image bearing member under specified image forming conditions; a toner pattern detection member for detecting the toner patterns formed on the image bearing member; a toner amount varying section for varying a target amount of toner to adhere to the toner patterns; and a control section that calculates a toner adherence amount and a toner adherence position from detection results outputted from the toner pattern detection member and that performs image stabilization control to adjust the image forming conditions based on the calculation results. In the image stabilization control, the control section uses detection results of the same toner patterns both to calculate the toner adherence amount and to calculate the toner adherence position.
    Type: Application
    Filed: July 23, 2010
    Publication date: January 27, 2011
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Mitsuru OBARA, Soh Hirota, Hironori Akashi, Takashi Harashima, Kanako Kibihara
  • Patent number: 7676163
    Abstract: In an image forming apparatus of the present invention, a developing unit for magenta contains magenta-type toner for pseudo full-color image forming whose chromaticity point is shifted closer to yellow hue on a chromaticity diagram, in comparison with genuine-magenta toner for full-color image forming, and likewise, a developing unit for cyan contains cyan-type toner for the pseudo full-color image forming whose chromaticity point is shifted closer to yellow hue on the chromaticity diagram, in comparison with genuine-cyan toner for the full-color image forming.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: March 9, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kazuomi Sakatani, Soh Hirota, Masahiro Kouzaki, Mitsuru Obara, Masaki Tanaka
  • Publication number: 20090311009
    Abstract: In a developer cartridge of toner and carrier, uneven distribution of the carrier at least in the vicinity of a replenishing port is eliminated regardless of the composition ratio between the carrier and the toner and the specific gravity of the carrier. Provided is a construction including a developer container in which a developer containing toner and carrier is received and which has a developing roller to supply the toner to an image carrier, a developer cartridge in which a replenishing developer containing the toner and the carrier is received and which has a replenishing port connected to the developer container to allow the developer container to be replenished with the developer via the replenishing port, and stirring means capable of stirring the developer located at least in the vicinity of the replenishing port in the developer cartridge.
    Type: Application
    Filed: March 10, 2009
    Publication date: December 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Shigeki NAIKI, Hironori Akashi, Soh Hirota, Mitsuru Obara
  • Patent number: 7522864
    Abstract: In an image forming apparatus of the present invention, a developing unit for magenta contains magenta-type toner for pseudo full-color image forming whose chromaticity point is shifted closer to yellow hue on a chromaticity diagram, in comparison with genuine-magenta toner for full-color image forming, and likewise, a developing unit for cyan contains cyan-type toner for the pseudo full-color image forming whose chromaticity point is shifted closer to yellow hue on the chromaticity diagram, in comparison with genuine-cyan toner for the full-color image forming.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: April 21, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kazuomi Sakatani, Soh Hirota, Masahiro Kouzaki, Mitsuru Obara, Masaki Tanaka
  • Publication number: 20090091796
    Abstract: An image forming apparatus performs dither processing on image data to form an image subjected to pseudo-halftone processing. The image forming apparatus includes a dither processing unit that performs dither processing on image data, and a dither pattern generation unit that generates a dither matrix for use in the dither processing, in accordance with an output gradation level. The dither matrix has a size of M×N pixels, and has a plurality of halftone dots arranged in a predetermined pattern in accordance with the output gradation level in order to represent a gradation of each color. The plurality of halftone dots are arranged in the dither matrix such that the halftone dots corresponding to at least two colors are substantially identical in color area ratio to each other in the dither matrix irrespective of a relative position with respective to the colors.
    Type: Application
    Filed: February 14, 2008
    Publication date: April 9, 2009
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Soh Hirota, Osamu Yamada, Toshio Tsuboi
  • Publication number: 20090067857
    Abstract: A tandem-type color image forming apparatus forms a toner pattern and toner markers on an intermediate transfer member. Tone levels in the toner pattern vary in a sub scanning direction, and the toner markers which are a same color with the tone pattern each oppose, in a main scanning direction, a different one of the tone level portions in the toner pattern, each tone level portion representing a different one of the tone levels. Positions of the toner markers in the sub scanning direction are determined to detect densities in the toner pattern corresponding to the determined positions. Tone of image data is corrected in an image formation based on a relationship between the densities and the tone levels corresponding to the determined positions.
    Type: Application
    Filed: September 5, 2008
    Publication date: March 12, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Soh HIROTA, Tetsuya SAKAI, Takashi HARASHIMA, Kazuomi SAKATANI, Masahiro KOUZAKI