Patents by Inventor Kunitomo SASAKI

Kunitomo SASAKI 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: 10691058
    Abstract: An image forming apparatus includes a latent image carrier whose rotational speed changes depending on a printing speed of an image onto a sheet, an applicator that applies a lubricant to a surface of the latent image carrier, and a hardware processor that causes a surface of the applicator to move such that a difference between a first moving speed and a second moving speed is within a certain range, the first moving speed being a speed at which the surface of the latent image carrier moves, the second moving speed being a speed at which the surface of the applicator moves.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: June 23, 2020
    Assignee: KONICA MINOLTA INC.
    Inventors: Kunitomo Sasaki, Masayasu Haga, Sayaka Morita, Tsugihito Yoshiyama
  • Patent number: 10656548
    Abstract: An image forming apparatus includes: a photoreceptor; a charging member that charges the photoreceptor; a charging power supply that outputs an AC bias as a charging bias to be applied to the charging member during image formation, and outputs a DC bias as the charging bias during a non-image forming operation, the AC bias being obtained by superimposing an alternating current voltage and a direct current voltage, the image formation forming a latent image, the DC bias being a direct current voltage, the non-image forming operation rotating and driving the photoreceptor; a processor that performs predetermined processing on the photoreceptor; and a controller that controls the charging power supply and the processor such that a value of a potential difference of the photoreceptor before and after being charged by the DC bias is a value equal to or less than a setting value during the non-image forming operation.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: May 19, 2020
    Assignee: Konica Minolta, Inc.
    Inventors: Tsugihito Yoshiyama, Masayasu Haga, Sayaka Morita, Kunitomo Sasaki
  • Publication number: 20200133189
    Abstract: An image forming apparatus includes a latent image carrier whose rotational speed changes depending on a printing speed of an image onto a sheet, an applicator that applies a lubricant to a surface of the latent image carrier, and a hardware processor that causes a surface of the applicator to move such that a difference between a first moving speed and a second moving speed is within a certain range, the first moving speed being a speed at which the surface of the latent image carrier moves, the second moving speed being a speed at which the surface of the applicator moves.
    Type: Application
    Filed: October 11, 2019
    Publication date: April 30, 2020
    Applicant: KONICA MINOLTA, INC.
    Inventors: Kunitomo SASAKI, Masayasu HAGA, Sayaka MORITA, Tsugihito YOSHIYAMA
  • Publication number: 20200103780
    Abstract: An image forming apparatus includes: a photoreceptor; a charging member that charges the photoreceptor; a charging power supply that outputs an AC bias as a charging bias to be applied to the charging member during image formation, and outputs a DC bias as the charging bias during a non-image forming operation, the AC bias being obtained by superimposing an alternating current voltage and a direct current voltage, the image formation forming a latent image, the DC bias being a direct current voltage, the non-image forming operation rotating and driving the photoreceptor; a processor that performs predetermined processing on the photoreceptor; and a controller that controls the charging power supply and the processor such that a value of a potential difference of the photoreceptor before and after being charged by the DC bias is a value equal to or less than a setting value during the non-image forming operation.
    Type: Application
    Filed: August 23, 2019
    Publication date: April 2, 2020
    Applicant: KONICA MINOLTA, INC.
    Inventors: Tsugihito Yoshiyama, Masayasu Haga, Sayaka Morita, Kunitomo Sasaki
  • Patent number: 9829831
    Abstract: The present wet development device includes a developer carrying member, a supply member that supplies a liquid developer to the developer carrying member, a charger that charges the liquid developer on the developer carrying member, a cleaner that removes the liquid developer on the developer carrying member, and a bias applying member that applies alternating bias in contact with the developer carrying member before removing by the cleaner. In a direction in alignment with an axis of rotation of the developer carrying member, a range to which the alternating bias is applied by the bias applying, member is located within a range in which the liquid developer is supplied onto the developer carrying member.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: November 28, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Atsuto Hirai, Takeshi Maeyama, Yuya Sato, Kunitomo Sasaki
  • Patent number: 9594340
    Abstract: An image forming apparatus includes: an image bearing body; a developing unit which develops an electrostatic latent image formed on the image bearing body as a toner image; a transfer unit which transfers the toner image to a receiver medium; a cleaning member which collects residual toner on the image bearing body; a lubricant supply unit which supplies lubricant onto the image bearing body; a measurement unit which measures a static frictional force generated between the image bearing body and the cleaning member; and a control unit which corrects the amount of lubricant on the image bearing body, wherein the control unit estimates a state of the lubricant on the image bearing body based on a change between a first and a second static frictional force, and based on the estimated state, the control unit selectively executes one of processing of supplying lubricant and processing of removing lubricant.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: March 14, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kazuko Fukumoto, Yuji Kamoda, Yasuo Shirodai, Yuya Sato, Kunitomo Sasaki
  • Patent number: 9494898
    Abstract: An image formation method includes a step of preparing an electrostatic latent image developer, a transferring step, and a fixation step. The step of preparing an electrostatic latent image developer includes a step of preparing an electrostatic latent image developer containing toner particles having prescribed viscoelasticity characteristics. The fixation step includes steps of heating a recording medium and fixing the toner particles to the recording medium at a pressure not lower than 200 kPa and not higher than 800 kPa.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: November 15, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kunitomo Sasaki, Naoki Yoshie, Masahiro Anno
  • Publication number: 20160209800
    Abstract: An image forming apparatus includes: an image bearing body; a developing unit which develops an electrostatic latent image formed on the image bearing body as a toner image; a transfer unit which transfers the toner image to a receiver medium; a cleaning member which collects residual toner on the image bearing body; a lubricant supply unit which supplies lubricant onto the image bearing body; a measurement unit which measures a static frictional force generated between the image bearing body and the cleaning member; and a control unit which corrects the amount of lubricant on the image bearing body, wherein the control unit estimates a state of the lubricant on the image bearing body based on a change between a first and a second static frictional force, and based on the estimated state, the control unit selectively executes one of processing of supplying lubricant and processing of removing lubricant.
    Type: Application
    Filed: January 14, 2016
    Publication date: July 21, 2016
    Applicant: Konica Minolta, Inc.
    Inventors: Kazuko FUKUMOTO, Yuji KAMODA, Yasuo SHIRODAI, Yuya SATO, Kunitomo SASAKI
  • Patent number: 9395653
    Abstract: The present wet-type developing device includes: a developer carrier for carrying a wet-type developer, which contains a charged toner particle and carrier liquid, and supplying the wet-type developer to an image carrier on which an electrostatic latent image is formed; a charge neutralizing unit for neutralizing a charge of the toner particle contained in the wet-type developer remaining on the developer carrier after supplying the wet-type developer to the image carrier; a dispersing unit for dispersing the toner particle in the carrier liquid by acting on the toner particle contained in the wet-type developer neutralized in charge by the charge neutralizing unit; and a removing unit for removing, from the developer carrier, the wet-type developer containing the toner particle dispersed by the dispersing unit.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: July 19, 2016
    Assignee: Konica Minolta, Inc.
    Inventors: Takeshi Maeyama, Kunitomo Sasaki
  • Patent number: 9389562
    Abstract: An image forming apparatus includes: an image carrier; a development unit configured to develop, as a toner image, an electrostatic latent image formed on the image carrier; a transfer unit configured to transfer the toner image to a medium to which a toner image is to be transferred; a cleaning unit configured to recover toner remaining on the image carrier after transferring the toner image; a lubricant supply unit configured to supply lubricant on the image carrier; a charge unit disposed between the development unit and the cleaning unit, along a surface of the image carrier; and a control unit configured to perform a first mode and a second mode, the first mode configured to form the toner image, the second mode configured to allow the charge unit to increase the amount of charge on toner reaching the cleaning unit relative to that in the first mode.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: July 12, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kunitomo Sasaki, Kazuko Fukumoto, Yuji Kamoda, Yasuo Shirodai, Yuya Sato
  • Publication number: 20160179046
    Abstract: An image forming apparatus includes: an image carrier; a development unit configured to develop, as a toner image, an electrostatic latent image formed on the image carrier; a transfer unit configured to transfer the toner image to a medium to which a toner image is to be transferred; a cleaning unit configured to recover toner remaining on the image carrier after transferring the toner image; a lubricant supply unit configured to supply lubricant on the image carrier; a charge unit disposed between the development unit and the cleaning unit, along a surface of the image carrier; and a control unit configured to perform a first mode and a second mode, the first mode configured to form the toner image, the second mode configured to allow the charge unit to increase the amount of charge on toner reaching the cleaning unit relative to that in the first mode.
    Type: Application
    Filed: December 17, 2015
    Publication date: June 23, 2016
    Applicant: KONICA MINOLTA, INC.
    Inventors: Kunitomo SASAKI, Kazuko FUKUMOTO, Yuji KAMODA, Yasuo SHIRODAI, Yuya SATO
  • Patent number: 9291949
    Abstract: A liquid development apparatus uses a developer to develop electrostatic latent images included in a plurality of image portion regions formed successively on an image carrier with an inter-image region being interposed. The liquid development apparatus includes a developer carrier and a control unit. Only a single developer carrier is provided so as to establish one-to-one relation with a single image carrier, it transports the developer to a development position opposed to the image carrier, and it develops the electrostatic latent image while it abuts to the image carrier. The control unit carries out prescribed control such that an amount of the developer supplied from the developer carrier to the inter-image region on the image carrier is reduced or set to zero.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: March 22, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventor: Kunitomo Sasaki
  • Publication number: 20150370197
    Abstract: The present wet development device includes a developer carrying member, a supply member that supplies a liquid developer to the developer carrying member, a charger that charges the liquid developer on the developer carrying member, a cleaner that removes the liquid developer on the developer carrying member, and a bias applying member that applies alternating bias in contact with the developer carrying member before removing by the cleaner. In a direction in alignment with an axis of rotation of the developer carrying member, a range to which the alternating bias is applied by the bias applying, member is located within a range in which the liquid developer is supplied onto the developer carrying member.
    Type: Application
    Filed: June 19, 2015
    Publication date: December 24, 2015
    Applicant: Konica Minolta, Inc.
    Inventors: Atsuto HIRAI, Takeshi MAEYAMA, Yuya SATO, Kunitomo SASAKI
  • Publication number: 20150253683
    Abstract: An image formation method includes a step of preparing an electrostatic latent image developer, a transferring step, and a fixation step. The step of preparing an electrostatic latent image developer includes a step of preparing an electrostatic latent image developer containing toner particles having prescribed viscoelasticity characteristics. The fixation step includes steps of heating a recording medium and fixing the toner particles to the recording medium at a pressure not lower than 200 kPa and not higher than 800 kPa.
    Type: Application
    Filed: March 3, 2015
    Publication date: September 10, 2015
    Applicant: Konica Minolta, Inc.
    Inventors: Kunitomo SASAKI, Naoki YOSHIE, Masahiro ANNO
  • Publication number: 20150078784
    Abstract: The present wet-type developing device includes: a developer carrier for carrying a wet-type developer, which contains a charged toner particle and carrier liquid, and supplying the wet-type developer to an image carrier on which an electrostatic latent image is formed; a charge neutralizing unit for neutralizing a charge of the toner particle contained in the wet-type developer remaining on the developer carrier after supplying the wet-type developer to the image carrier; a dispersing unit for dispersing the toner particle in the carrier liquid by acting on the toner particle contained in the wet-type developer neutralized in charge by the charge neutralizing unit; and a removing unit for removing, from the developer carrier, the wet-type developer containing the toner particle dispersed by the dispersing unit.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 19, 2015
    Inventors: Takeshi MAEYAMA, Kunitomo SASAKI
  • Patent number: 8948633
    Abstract: A wet-type image forming apparatus includes a density detection unit and a charge amount control unit for controlling the charge amount of toner on a liquid developer carrier. An image forming unit forms patch images while the charge amount control unit successively changes the charge amount of toner on the liquid developer carrier in a state in which a development bias is held at a prescribed value. The density detection unit detects the image density of each patch image thereby detecting a range of the charge amount of toner in which the image density of the patch image is almost saturated. The charge amount of toner in normal image formation is set to be equal to or greater than the range of the charge amount of toner in which the image density of the patch image is almost saturated.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: February 3, 2015
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kunitomo Sasaki, Masahiko Matsuura, Takeshi Maeyama
  • Publication number: 20130336678
    Abstract: A liquid development apparatus uses a developer to develop electrostatic latent images included in a plurality of image portion regions formed successively on an image carrier with an inter-image region being interposed. The liquid development apparatus includes a developer carrier and a control unit. Only a single developer carrier is provided so as to establish one-to-one relation with a single image carrier, it transports the developer to a development position opposed to the image carrier, and it develops the electrostatic latent image while it abuts to the image carrier. The control unit carries out prescribed control such that an amount of the developer supplied from the developer carrier to the inter-image region on the image carrier is reduced or set to zero.
    Type: Application
    Filed: June 12, 2013
    Publication date: December 19, 2013
    Inventor: Kunitomo SASAKI
  • Publication number: 20130101304
    Abstract: A wet-type image forming apparatus includes a density detection unit and a charge amount control unit for controlling the charge amount of toner on a liquid developer carrier. An image forming unit forms patch images while the charge amount control unit successively changes the charge amount of toner on the liquid developer carrier in a state in which a development bias is held at a prescribed value. The density detection unit detects the image density of each patch image thereby detecting a range of the charge amount of toner in which the image density of the patch image is almost saturated. The charge amount of toner in normal image formation is set to be equal to or greater than the range of the charge amount of toner in which the image density of the patch image is almost saturated.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 25, 2013
    Inventors: Kunitomo SASAKI, Masahiko MATSUURA, Takeshi MAEYAMA