Patents by Inventor Nobutaka Eguchi

Nobutaka Eguchi 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: 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
  • 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
  • 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
  • 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