Patents by Inventor Akira Izutani

Akira Izutani 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: 9442432
    Abstract: An intermediate transfer member, including: a layer containing a thermoplastic resin, an electroconductive resin, and electroconductive inorganic particles, wherein the layer has a sea-island structure where discontinuous phases formed from the electroconductive resin are present in a continuous phase formed from the thermoplastic resin, wherein in a cross-sectional surface of the layer perpendicular to a rotation direction of the intermediate transfer member, the discontinuous phases formed from the electroconductive resin each have a cross-sectional shape of an ellipse, and a minor axis b of the ellipse is from 0.5 ?m to 5.0 ?m, and wherein in the cross-sectional surface of the layer perpendicular to the rotation direction of the intermediate transfer member, a rate ? of a total area of the discontinuous phases formed from the electroconductive resin in an area of the cross-sectional surface thereof is from 2.0% to 20.0%.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: September 13, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Ayano Momose, Akira Izutani, Makoto Matsushita
  • Publication number: 20160259273
    Abstract: An intermediate transfer belt includes a thermoplastic resin and a fibrous material. The fibrous material has an orientation angle Fa of from 5° to 30° in a direction perpendicular to a circumferential direction of the intermediate transfer belt.
    Type: Application
    Filed: February 22, 2016
    Publication date: September 8, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Akira Izutani, Hideaki Yasunaga, Makoto Matsushita, Hiroaki Takahashi, Keiichiro Juri, Ayano Momose, Yuri Haga
  • Patent number: 9436136
    Abstract: An intermediate transferer includes a polyvinylidene fluoride resin including polyvinylidene fluoride and a vinylidene fluoride-hexafluoropropylene copolymer, a conductive agent and an additive. The additive includes a polymer including a polyalkyleneoxide structure having a number-average molecular weight not less than 1,000. The polyvinylidene fluoride resin includes the vinylidene fluoride-hexafluoropropylene copolymer in an amount of from 5 to 30 parts by weight per 100 parts by weight of the polyvinylidene fluoride. The intermediate transferer includes the conductive agent in an amount of from 1.0 to 20 parts by weight and the additive in an amount of from 1.0 to 10 parts by weight per 100 parts by weight of the polyvinylidene fluoride resin.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: September 6, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Makoto Matsushita, Akira Izutani, Ayano Momose
  • Patent number: 9405235
    Abstract: Provided is a resin composition including at least: polyolefin in an amount of from 50% by mass to 90% by mass; an electro-conductive agent; and a compound represented by General Formula (1) below, In General Formula (1), R is preferably a divalent group having a number overage molecular weight of 1,000 or greater and derived from acrylic polymer.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: August 2, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Makoto Matsushita, Akira Izutani, Chiyoshi Nozaki
  • Publication number: 20160202638
    Abstract: A semiconductive resin composition includes at least two thermoplastic resins and a conductive filler. Each of the two thermoplastic resins has a sea-island structure, and 40% to 75% of the conductive filler are present in the thermoplastic resin in an island portion of the sea-island structure at an areal ratio of a cross section observed with a scanning electron microscope.
    Type: Application
    Filed: December 14, 2015
    Publication date: July 14, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroaki Takahashi, Hideaki Yasunaga, Akira Izutani, Makoto Matsushita, Keiichiro Juri, Yuri Haga, Ayano Momose
  • Publication number: 20160202639
    Abstract: A semiconductive resin composition includes a plurality of thermoplastic resins forming a sea-island structure including a sea portion and an island portion; and a plurality of conductive fillers. The sea portion includes at least two of the thermoplastic resins, at least one of the at least two of the thermoplastic resins is a copolymer, and the content of the copolymer is from 20% to 60% by weight per 100% by weight of the thermoplastic resins in the sea portion, and the following relation is satisfied: 1.5?B/A?10 wherein A represents an average primary particle diameter of one of the conductive fillers having the smallest average primary particle diameter and B represents an average primary particle diameter of one of the conductive fillers having the largest average primary particle diameter.
    Type: Application
    Filed: December 18, 2015
    Publication date: July 14, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Makoto Matsushita, Akira IZUTANI, Hiroaki TAKAHASHI, Yuri HAGA, Keiichiro JURI, Hideaki YASUNAGA
  • Publication number: 20160187816
    Abstract: A composition for seamless belt includes a thermoplastic resin; and a conductive agent. A liquid extracted from the composition with methanol has an intensity not greater than 7×108 in a total ion chromatogram.
    Type: Application
    Filed: December 4, 2015
    Publication date: June 30, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Makoto Matsushita, Akira IZUTANI, Hideaki YASUNAGA, Keiichiro JURI, Ayano MOMOSE, Yuri HAGA, Hiroaki TAKAHASHI
  • Publication number: 20150078791
    Abstract: An intermediate transfer member, including: a layer containing a thermoplastic resin, an electroconductive resin, and electroconductive inorganic particles, wherein the layer has a sea-island structure where discontinuous phases formed from the electroconductive resin are present in a continuous phase formed from the thermoplastic resin, wherein in a cross-sectional surface of the layer perpendicular to a rotation direction of the intermediate transfer member, the discontinuous phases formed from the electroconductive resin each have a cross-sectional shape of an ellipse, and a minor axis b of the ellipse is from 0.5 ?m to 5.0 ?m, and wherein in the cross-sectional surface of the layer perpendicular to the rotation direction of the intermediate transfer member, a rate ? of a total area of the discontinuous phases formed from the electroconductive resin in an area of the cross-sectional surface thereof is from 2.0% to 20.0%.
    Type: Application
    Filed: September 3, 2014
    Publication date: March 19, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ayano MOMOSE, Akira IZUTANI, Makoto MATSUSHITA
  • Publication number: 20150014602
    Abstract: An intermediate transferer includes a polyvinylidene fluoride resin including polyvinylidene fluoride and a vinylidene fluoride-hexafluoropropylene copolymer, a conductive agent and an additive. The additive includes a polymer including a polyalkyleneoxide structure having a number-average molecular weight not less than 1,000. The polyvinylidene fluoride resin includes the vinylidene fluoride-hexafluoropropylene copolymer in an amount of from 5 to 30 parts by weight per 100 parts by weight of the polyvinylidene fluoride. The intermediate transferer includes the conductive agent in an amount of from 1.0 to 20 parts by weight and the additive in an amount of from 1.0 to 10 parts by weight per 100 parts by weight of the polyvinylidene fluoride resin.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 15, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Makoto Matsushita, Akira Izutani, Ayano Momose
  • Patent number: 8886096
    Abstract: A belt-shaped member for image forming apparatus, satisfying the following relationships: E1?E2; and H2>H1 wherein E1 represents an elastic modulus of a center of the belt-shaped member in a thrust direction; E2 represents an elastic modulus of an end thereof; H1 is a breaking elongation of the center; and H2 represents a breaking elongation of the end.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: November 11, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Makoto Matsushita, Akira Izutani
  • Publication number: 20140243465
    Abstract: Provided is a resin composition including at least: polyolefin in an amount of from 50% by mass to 90% by mass; an electro-conductive agent; and a compound represented by General Formula (1) below, In General Formula (1), R is preferably a divalent group having a number overage molecular weight of 1,000 or greater and derived from acrylic polymer.
    Type: Application
    Filed: February 20, 2014
    Publication date: August 28, 2014
    Applicant: Ricoh Company, Ltd.
    Inventors: Makoto Matsushita, Akira Izutani, Chiyoshi Nozaki
  • Patent number: 8374532
    Abstract: An image forming apparatus including a latent image bearing member, a charger, an irradiator, a developing member, a transfer device, and a surface potential equalizer. The transfer device includes an intermediate transfer member comprising a high-resistivity body having a surface resistivity of 1013?/? or more under dark conditions, a primary transfer member that transfers the toner image from the latent image bearing member onto the intermediate transfer member at a primary transfer nip, and a secondary transfer member that transfers the toner image from the intermediate transfer member onto a recording medium at a secondary transfer nip. The surface potential equalizer includes a surface potential equalizing member that equalizes a surface potential of the intermediate transfer member at a predetermined positive or negative potential. The surface potential equalizer is provided on a migration path of the intermediate transfer member from the secondary transfer nip to the primary transfer nip.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: February 12, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Makoto Matsushita, Akira Izutani
  • Patent number: 8369760
    Abstract: An image forming method for fixing a toner image on a recording medium by passing the recording medium through a fixing nip defined between a first member and a second member under heat and pressure. The toner includes a specific amount of a shear buffer. The first and second members extend along respective first and second longitudinal axes, and have respective at least one convex portion curving outward and at least one concave portion curving inward with respect to each of the respective first and second longitudinal axes. At least one of the first and second members is heated, and the first convex portion engages the second concave portion and the first concave portion engages the second convex portion, to define the fixing nip therebetween.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: February 5, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Atsushi Yamamoto, Akira Izutani
  • Patent number: 8338066
    Abstract: A toner including a resin having a polyester skeleton, a coloring agent, a vinyl based copolymer resin, and a releasing agent, wherein the toner is manufactured by dissolving or dispersing a resin including the resin having a polyester skeleton and a mixture of the vinyl based copolymer resin and the releasing agent in an organic solvent to obtain a lysate and/or a dispersion material, dispersing the lysate and/or the dispersion material in an aqueous medium to obtain a liquid dispersion and removing the organic solvent from the liquid dispersion.
    Type: Grant
    Filed: September 2, 2009
    Date of Patent: December 25, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Nozaki, Chiyoshi Nozaki, Atsushi Yamamoto, Minoru Nakamura, Akira Izutani
  • Patent number: 8329080
    Abstract: A conductive composition including a matrix resin comprising a thermoplastic resin, a conductive agent comprising a carbon black having an amine value of 1 to 100 mgKOH/g, and a stiffening agent comprising an acid anhydride, a carboxylic acid, or a compound having an epoxy group.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 11, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Makoto Matsushita, Chiyoshi Nozaki, Shuuichi Nakagawa, Akira Izutani
  • Publication number: 20120294657
    Abstract: A belt-shaped member for image forming apparatus, satisfying the following relationships: E1?E2; and H2>H1 wherein E1 represents an elastic modulus of a center of the belt-shaped member in a thrust direction; E2 represents an elastic modulus of an end thereof; H1 is a breaking elongation of the center; and H2 represents a breaking elongation of the end.
    Type: Application
    Filed: April 3, 2012
    Publication date: November 22, 2012
    Inventors: Makoto MATSUSHITA, Akira Izutani
  • Patent number: 8311467
    Abstract: An image forming method for fixing a toner image on a recording medium by passing the recording medium through a fixing nip defined between a first member and a second member under heat and pressure. The toner has a specific loss elastic modulus. The first and second members extend along respective first and second longitudinal axes, and have respective first and second elastic layers whose thickness vary along the respective first and second longitudinal axes to define at least one convex portion curving outward and at least one concave portion curving inward with respect to each of the respective first and second longitudinal axes. The first convex portion engages the second concave portion and the first concave portion engages the second convex portion, to define the fixing nip therebetween.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: November 13, 2012
    Assignee: Ricoh Company Limited
    Inventors: Atsushi Yamamoto, Yoshihiro Fukuhata, Akira Izutani
  • Patent number: 8206879
    Abstract: To provide an image forming method for obtaining excellent image quality under high humidity. The image forming method including charging a surface of a latent electrostatic image bearing member, exposing the charged surface of the latent electrostatic image bearing member so as to form a latent electrostatic image, developing the latent electrostatic image using a developer so as to form a toner image, and transferring the toner image from the latent electrostatic image bearing member to a transfer medium, wherein in the developing step, a toner is used that has an interparticle adhesion force of 500 nN to 1,200 nN when pressed at 500 nN and a volume average particle diameter of 4 ?m to 8 ?m, and in the transferring step, the transfer pressure applied to the transfer medium is 20 N/m to 60 N/m, and wherein a tandem image forming apparatus is used in the image forming method.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: June 26, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Akira Izutani, Minoru Nakamura
  • Patent number: 8153342
    Abstract: A developer including a toner and a carrier, wherein the carrier is a ferrite carrier coated with a silicone resin and the following relationships are satisfied: log(?Q(t)/Q?)=?kobt ?Q(t)=Q??Q(t) ?2.5 ?log(kob)??1 wherein Q(t) is a charge quantity (?C/g) of the developer after t sec which is a stirring time of the toner and the carrier; Q? is a saturated charge quantity (?C/g) of the developer; and kob is a chargeable speed of the developer.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: April 10, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Akira Izutani
  • Publication number: 20110249994
    Abstract: A conductive composition including a matrix resin comprising a thermoplastic resin, a conductive agent comprising a carbon black having an amine value of 1 to 100 mgKOH/g, and a stiffening agent comprising an acid anhydride, a carboxylic acid, or a compound having an epoxy group.
    Type: Application
    Filed: April 1, 2011
    Publication date: October 13, 2011
    Inventors: Makoto Matsushita, Chiyoshi Nozaki, Shuuichi Nakagawa, Akira Izutani