Patents by Inventor Hidetoshi Kami

Hidetoshi Kami 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: 20210003931
    Abstract: Provided is a photoelectric conversion device including: a support; a charge-transporting layer including an organic charge-transporting material or a sensitizing dye electrode layer including an organic sensitizing dye, where the charge-transporting layer or the sensitizing dye electrode layer is disposed on the support; and a ceramic film disposed on the charge-transporting layer or the sensitizing dye electrode layer.
    Type: Application
    Filed: January 22, 2019
    Publication date: January 7, 2021
    Inventors: Daisuke KUBO, Hidetoshi KAMI, Suzuka NOZOE, Tomoharu ASANO, Tetsuya TOSHINE, Nozomu TAMOTO, Yuuji TANAKA, Naomichi KANEI
  • Patent number: 10845738
    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: Grant
    Filed: July 12, 2019
    Date of Patent: November 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Akihiro Sugino, Keisuke Shimoyama, Ryohta Takahashi
  • Patent number: 10585366
    Abstract: Provided is an image forming apparatus including an image bearer capable of bearing a toner image, where a latent image is formed on the image bearer, a developing unit configured to develop the latent image formed on the image bearer with a toner, and a cleaning unit including a blade-shaped elastic body, where the elastic body is brought into contact with a surface of the image bearer, wherein a friction coefficient Ft/Fn between the image bearer and the elastic body is 0.85 or greater but 1.1 or less, and self-excited vibration WRFt(LMH) of shear force of the elastic body in a LMH band is 1.5 gf or greater but 3.5 gf or less.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: March 10, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Hiroki Orii, Ryohta Takahashi
  • Publication number: 20200033743
    Abstract: An electrophotographic photoconductor is provided. The electrophotographic photoconductor includes a conductive substrate, a photosensitive layer, and a surface layer containing fluororesin particles, non-fluororesin particles, and a cured resin. The fluororesin particles have an average particle diameter of from 0.01 to 0.3 ?m in a cross-sectional image of the surface layer as observed by a scanning electron microscope with a magnification of 5,000 times, and when the cross-sectional image is segmented into uniform regions each being 1 ?m×4 ?m, a standard deviation of areas each of which is occupied by the fluororesin particles and the non-fluororesin particles in each of the regions is 0.2 ?m2 or less.
    Type: Application
    Filed: June 19, 2019
    Publication date: January 30, 2020
    Inventors: Hidetoshi KAMI, Tomoharu Asano
  • Patent number: 10545417
    Abstract: An electrophotographic photoconductor is provided. The electrophotographic photoconductor includes a conductive substrate, a photosensitive layer, and a surface layer containing fluororesin particles, non-fluororesin particles, and a cured resin. The fluororesin particles have an average particle diameter of from 0.01 to 0.3 ?m in a cross-sectional image of the surface layer as observed by a scanning electron microscope with a magnification of 5,000 times, and when the cross-sectional image is segmented into uniform regions each being 1 ?m×4 ?m, a standard deviation of areas each of which is occupied by the fluororesin particles and the non-fluororesin particles in each of the regions is 0.2 ?m2 or less.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: January 28, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Tomoharu Asano
  • 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
  • Publication number: 20190285997
    Abstract: Provided is an image forming apparatus including an image bearer capable of bearing a toner image, where a latent image is formed on the image bearer, a developing unit configured to develop the latent image formed on the image bearer with a toner, and a cleaning unit including a blade-shaped elastic body, where the elastic body is brought into contact with a surface of the image bearer, wherein a friction coefficient Ft/Fn between the image bearer and the elastic body is 0.85 or greater but 1.1 or less, and self-excited vibration WRFt(LMH) of shear force of the elastic body in a LMH band is 1.5 gf or greater but 3.5 gf or less.
    Type: Application
    Filed: March 4, 2019
    Publication date: September 19, 2019
    Inventors: Hidetoshi KAMI, Hiroki ORII, 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
  • 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: 9046863
    Abstract: An image forming apparatus is provided. The image forming apparatus includes a photoreceptor; a charger to charge a surface of the photoreceptor; a circulating agent applicator to apply a circulating agent to the surface of the photoreceptor while contacting the surface of the photoreceptor to form a film of the circulating agent on the surface of the photoreceptor; and a contact member contacted with the surface of the photoreceptor. The acting force, which is generated by contact of the contact member with the photoreceptor and includes a tangential force Ft, which is a force in a tangential direction at a contact portion of the contact member with the surface of the photoreceptor, and a normal force Fn, which is a force in a normal direction at the contact portion, satisfies the following relationships, 0.90?Ft/Fn?0.96, and 1.15 kgf?Ft?1.35 kgf.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: June 2, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Kazuyuki Nakatsuru
  • 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: 8795935
    Abstract: An electrophotographic photoconductor having a photosensitive layer and a crosslinked resin surface layer over a support, wherein shapes of concaves and convexes in a surface of the electrophotographic photoconductor are measured by a surface roughness/profile measuring device to obtain one-dimensional data arrays, the arrays are subjected to multiresolution analysis (MRA-1) through wavelet transformation to be separated into six frequency components including HHH, HHL, HMH, HML, HLH and HLL to obtain one-dimensional data arrays, the arrays of the HHL are thinned out to be reduced 1/10 to 1/100, thereby producing one-dimensional data arrays, which are then subjected to multiresolution analysis (MRA-2) through wavelet transformation to be separated into six frequency components including LHH, LHL, LMH, LML, LLH and LLL to thereby obtain 12 frequency components in total; and a center-line average roughness (WRa) of the 12 frequency components satisfies relationship (i) below.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: August 5, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Junichi Yamazaki, Yukio Fujiwara, Kazuhiro Egawa