Patents by Inventor Akihiro Sugino

Akihiro Sugino 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).

  • Publication number: 20200004179
    Abstract: An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, wherein the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2, |Ip (the surface of the photoconductor)?Ip (the surface of the toner)|?5.53 (eV)?? Relation 1 5.45 (eV)?Ip (the surface of the photoconductor)?5.53 (eV)?? Relation 2 where Ip (the surface of the photoconductor) represents the ionization potential of the surface of the photoconductor and Ip (the surface of the toner) represents the ionization potential of the surface of the toner.
    Type: Application
    Filed: July 12, 2019
    Publication date: January 2, 2020
    Inventors: Hidetoshi KAMI, Akihiro Sugino, Keisuke Shimoyama, Ryohta Takahashi
  • Patent number: 10416594
    Abstract: An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, wherein the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2, |Ip (the surface of the photoconductor)?Ip (the surface of the toner)|?0.18 (eV)?? Relation 1 5.45 (eV)?Ip (the surface of the photoconductor)?5.53 (eV)?? Relation 2 where Ip (the surface of the photoconductor) represents the ionization potential of the surface of the photoconductor and Ip (the surface of the toner) represents the ionization potential of the surface of the toner.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: September 17, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Akihiro Sugino, Keisuke Shimoyama, Ryohta Takahashi
  • Patent number: 10114302
    Abstract: A photoconductor is provided. The photoconductor includes a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a binder resin and a zinc oxide particle. The photosensitive layer includes a compound represented by the following formula (1): where each of R1 and R2 independently represents an alkyl group or an aromatic hydrocarbon group.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: October 30, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryohta Takahashi, Akihiro Sugino, Eiji Kurimoto, Hidetoshi Kami, Keisuke Shimoyama, Tetsuro Suzuki, Tomoharu Asano, Toshihiro Ishida
  • Patent number: 9989868
    Abstract: Disclosed herein is a photoconductor containing an electroconductive substrate and a photosensitive layer, wherein, in a curve obtained by the steps (I) through (V) described herein, a surface of the photosensitive layer has a WRa (LML) of from 0.02 ?m to 0.03 ?m, a WRa (LHL) of from 0.006 ?m to 0.01 ?m, and a WRa (HLH) of 0.001 ?m or less, where the arithmetical mean roughness (WRa) are defined as Ra in JIS-B0601:2001 and WRa (HHH) to WRa (LLL) represent individual Ra's as described herein.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: June 5, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Nobutaka Eguchi, Akihiro Sugino, Keisuke Shimoyama
  • Publication number: 20180113403
    Abstract: An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, wherein the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2, |Ip(the surface of the photoconductor)?Ip(the surface of the toner)|?0.18 (eV)?? Relation 1 5.45 (eV)?Ip(the surface of the photoconductor)?5.53 (eV)?? Relation 2 where Ip (the surface of the photoconductor) represents the ionization potential of the surface of the photoconductor and Ip (the surface of the toner) represents the ionization potential of the surface of the toner.
    Type: Application
    Filed: September 13, 2017
    Publication date: April 26, 2018
    Inventors: Hidetoshi Kami, Akihiro Sugino, Keisuke Shimoyama, Ryohta Takahashi
  • Publication number: 20170343908
    Abstract: A photoconductor is provided. The photoconductor includes a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a binder resin and a zinc oxide particle. The photosensitive layer includes a compound represented by the following formula (1): where each of R1 and R2 independently represents an alkyl group or an aromatic hydrocarbon group.
    Type: Application
    Filed: May 9, 2017
    Publication date: November 30, 2017
    Inventors: Ryohta TAKAHASHI, Akihiro SUGINO, Eiji KURIMOTO, Hidetoshi KAMI, Keisuke SHIMOYAMA, Tetsuro SUZUKI, Tomoharu ASANO, Toshihiro ISHIDA
  • Patent number: 9740116
    Abstract: A photoconductor includes an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide particle and a binder resin, and satisfies the following relations (1) and (2): Smr=Scut/Sk??(1) 0.4?Smr?0.6??(2) where Smr represents an areal ratio of concave parts; Sk represents a reference area; and a Scut represents a cross-sectional area obtained by cutting a three-dimensional curved surface obtained from the reference area with an average height surface, the average height surface being a surface constituted of averaged height of all measured height data.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: August 22, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobutaka Eguchi, Akihiro Sugino, Hidetoshi Kami, Keisuke Shimoyama, Kazuhiro Egawa
  • Patent number: 9523930
    Abstract: A photoconductor, including an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide and a binder resin, and has a WRa (LLH) less than 0.12 ?m and WRa (LHH) of from 0.03 to 0.2 ?m in a curve.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: December 20, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Nobutaka Eguchi, Akihiro Sugino, Keisuke Shimoyama, Kazuhiro Egawa
  • Publication number: 20160274475
    Abstract: A photoconductor includes an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide particle and a binder resin, and satisfies the following relations (1) and (2): Smr=Scut/Sk??(1) 0.4?Smr?0.6??(2) wherein Smr represents an areal ratio of projecting parts; Sk represents a reference area; and a Scut represents a cross-sectional area obtained by cutting a three-dimensional curved surface obtained from the reference area with an average height surface, the average height surface being a surface constituted of averaged height of all measured height data.
    Type: Application
    Filed: February 26, 2016
    Publication date: September 22, 2016
    Inventors: Nobutaka EGUCHI, Akihiro Sugino, Hidetoshi Kami, Keisuke Shimoyama, Kazuhiro Egawa
  • Publication number: 20150346613
    Abstract: A photoconductor includes an electroconductive substrate; and a photosensitive layer provided overlying the electroconductive substrate, wherein, in a curve obtained by: (I) measuring a convexoconcave form, (II) conducting multi-resolution analysis (MRA-1), (III). making a single dimensional data arrangement, (IV) conducting further wavelet conversion, (V) connecting logarithms, a surface of the photosensitive layer has a WRa (LML) of from 0.02 ?m to 0.03 ?m, a WRa (LHL) of from 0.006 ?m to 0.01 ?m, and a WRa (HLH) of 0.
    Type: Application
    Filed: May 20, 2015
    Publication date: December 3, 2015
    Inventors: Hidetoshi KAMI, Nobutaka EGUCHI, Akihiro SUGINO, Keisuke SHIMOYAMA
  • Patent number: 9146483
    Abstract: In a photoreceptor including an electroconductive substrate; a photosensitive layer; and a protective layer, the protective layer includes a crosslinked resin having a residual group of a polycarboxylic acid compound and a group having the below-mentioned formula (10), and at least one of a compound having the below-mentioned formula (2) and a compound having the below-mentioned formula (3). wherein each of R5 and R6 independently represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms. wherein each of R7 and R8 independently represents a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms, and Z1 represents a vinylene group, a divalent aromatic hydrocarbon group having 6 to 14 carbon atoms, or a 2,5-thiophenediyl group.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: September 29, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuaki Hirose, Akihiro Sugino, Noboru Toriu, Keisuke Shimoyama, Tomoharu Asano
  • Publication number: 20150227063
    Abstract: A photoconductor, including an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide and a binder resin, and has a WRa (LLH) less than 0.12 ?m and WRa (LHH) of from 0.03 to 0.2 ?m in a curve.
    Type: Application
    Filed: February 3, 2015
    Publication date: August 13, 2015
    Inventors: Hidetoshi KAMI, Nobutaka EGUCHI, Akihiro SUGINO, Keisuke SHIMOYAMA, Kazuhiro EGAWA
  • Patent number: 9031491
    Abstract: An image forming apparatus, including a photoreceptor; a charger; an irradiator; an image developer; a transferer; a fixer; and a cleaning blade formed of a strip-shaped elastic blade, removing a powder from the surface of the photoreceptor passing an edge line of the blade while contacting thereto, wherein the photoreceptor includes a crosslinked resin surface layer formed of at least one of an acrylic resin and a methacrylic resin, and the cleaning blade includes a contact point with the photoreceptor, including a substrate; a mixed layer formed of at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: May 12, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Hideo Nakamori, Akihiro Sugino, Noboru Toriu, Keisuke Shimoyama, Mitsuaki Hirose, Yohta Sakon, Masahiro Ohmori
  • Patent number: 8927183
    Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer, which is located overlying the electroconductive substrate and which includes a charge generation material, a charge transport material having no radical polymerizability, a binder resin having no radical polymerizability, and a crosslinked polymer including a unit obtained from a first radically polymerizable monomer having three or more functional groups and no charge transport structure and a unit obtained from a second radically polymerizable monomer having a charge transport structure; and an outermost layer, which is located on the photosensitive layer and which includes a crosslinked polymer including a unit obtained from a third radically polymerizable monomer having three or more functional groups and no charge transport structure and a unit obtained from a fourth radically polymerizable monomer having a charge transport structure. An image forming method and apparatus, and a process cartridge using the photoreceptor.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Kawasaki, Akihiro Sugino, Mitsuaki Hirose
  • Publication number: 20140234763
    Abstract: An image forming apparatus includes an image bearing member having a photosensitive layer and a sub-surface layer having a charge transportability, overlying the photosensitive layer wherein the sub-surface layer is formed of a cured material formed of a radical polymerizable monomer having three or more functional groups with no charge transport structure and a radical polymerizable compound having a charge transport structure, wherein the arithmetical mean roughness WRa of about each of frequency components of HMH, HML, and HLH obtained by wavelet conversion of values measured by a surface texture and the contour form measuring device ranges from 0.0002 ?m to 0.005 ?m and WRa (LLH) is 0.05 ?m or less, wherein the sub-surface layer contains at least one of a particular oxazole compound or a particular diamine compound.
    Type: Application
    Filed: February 6, 2014
    Publication date: August 21, 2014
    Inventors: Akihiro SUGINO, Keisuke Shimoyama, Tomoharu Asano, Hidetoshi Kami, Nobutaka Eguchi, Kazuhiro Egawa, Tomoyuki Shimada, Ryota Arai, Masayoshi Nomura
  • Patent number: 8647798
    Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer on the electroconductive substrate; and a protection layer on the photosensitive layer, wherein the protection layer includes a radical polymerizable compound having three or more radical polymerizable groups without a charge transportable group, a monofunctional radical polymerizable compound having a specific charge transportable group and a non-radical polymerizable compound having a specific charge transportable group.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: February 11, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Hiroshi Ikuno, Akihiro Sugino, Hideo Nakamori, Mitsuaki Hirose
  • Publication number: 20130330104
    Abstract: A photoreceptor includes an electroconductive substrate, and a laminate structure formed of at least a charge generating layer and a charge transport layer and provided overlying the electroconductive substrate, wherein the charge transport layer contains a charge transport material, a compound represented by the following formula 1 and a compound represented by the following formula 2: in the formula 1, R1 and R2 each independently represent substituted or non-substituted alkyl groups or aromatic hydrocarbon groups and one of R1 and R2 represents a substituted or non-substituted aromatic hydrocarbon group, R1 and R2 bonded to the same nitrogen atom may be bonded together to form a substituted or non-substituted nitrogen-containing heterocyclic group, and Ar represents a substituted or non-substituted hydrocarbon group; in the formula 2, R3 and R4 each independently represent substituted or non-substituted alkyl groups or aromatic hydrocarbon groups.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 12, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Keisuke Shimoyama, Akihiro Sugino, Mitsuaki Hirose, Tomoharu Asano, Noboru Toriu, Hideo Nakamori
  • Publication number: 20130251401
    Abstract: An image forming apparatus, including a photoreceptor; a charger; an irradiator; an image developer; a transferer; a fixer; and a cleaning blade formed of a strip-shaped elastic blade, removing a powder from the surface of the photoreceptor passing an edge line of the blade while contacting thereto, wherein the photoreceptor includes a crosslinked resin surface layer formed of at least one of an acrylic resin and a methacrylic resin, and the cleaning blade includes a contact point with the photoreceptor, including a substrate; a mixed layer formed of at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.
    Type: Application
    Filed: February 12, 2013
    Publication date: September 26, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomoharu Asano, Hideo Nakamori, Akihiro Sugino, Noboru Toriu, Keisuke Shimoyama, Mitsuaki Hirose, Yohta Sakon, Masahiro Ohmori
  • Publication number: 20130243483
    Abstract: In a photoreceptor including an electroconductive substrate; a photosensitive layer; and a protective layer, the protective layer includes a crosslinked resin having a residual group of a polycarboxylic acid compound and a group having the below-mentioned formula (10), and at least one of a compound having the below-mentioned formula (2) and a compound having the below-mentioned formula (3). wherein each of R5 and R6 independently represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms. wherein each of R7 and R8 independently represents a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms, and Z1 represents a vinylene group, a divalent aromatic hydrocarbon group having 6 to 14 carbon atoms, or a 2,5-thiophenediyl group.
    Type: Application
    Filed: February 20, 2013
    Publication date: September 19, 2013
    Inventors: Mitsuaki HIROSE, Akihiro Sugino, Noboru Toriu, Keisuke Shimoyama, Tomoharu Asano
  • Patent number: 8472818
    Abstract: An image carrier deterioration degree evaluating apparatus for evaluating a degree of deterioration of an image carrier of an image forming apparatus, the image carrier deterioration degree evaluating apparatus including: an image deletion detecting unit that detects image deletion by obtaining latent image information written on the image carrier; an image deletion reducing unit that performs a process of reducing image deletion when the image deletion detecting unit detects image deletion, and an image carrier deterioration degree evaluating unit that drives the image deletion detecting unit and the image deletion reducing unit alternately one or more times each, and evaluates a degree of deterioration of the image carrier by using the latent image information obtained one or more times by the image deletion detecting unit.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: June 25, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Yamane, Yasushi Nakazato, Kohji Ue, Masahide Yamashita, Mikiko Imazeki, Yasuo Suzuki, Michio Kimura, Takaaki Ikegami, Yoshiaki Kawasaki, Hideo Nakamori, Akihiro Sugino