Patents by Inventor Tomoharu Asano

Tomoharu Asano 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
  • 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
  • Patent number: 10466604
    Abstract: Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat layer contains at least metal oxide particles, a binder, and a salicylic acid derivative such as 4-methylsalicylic acid, wherein the metal oxide particles have a volume resistivity of 1×105 ?·cm or higher but 1×108 ?·cm or lower, wherein the undercoat layer has a volume resistivity of 0.001×106 ?·cm or higher but 0.02×106 ?·cm or lower, and wherein the undercoat layer has a thickness of 2 micrometers or greater but 20 micrometers or less.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: November 5, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Tetsuya Toshine, Mitsuaki Hirose, Tomoharu Asano
  • Patent number: 10209639
    Abstract: A photoconductor including a conductive support, an undercoat layer, a charge-generating layer, and a charge-transporting layer, at least the undercoat layer, the charge-generating layer, and the charge-transporting layer being disposed on the conductive support in an order mentioned, wherein the undercoat layer includes a binder resin and metal oxide particles, and the charge-generating layer includes a binder resin, a titanyl phthalocyanine pigment, and a salicylic acid derivative.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: February 19, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Tetsuro Suzuki, Eiji Kurimoto, Daisuke Nii, Toshihiro Ishida
  • Patent number: 10191398
    Abstract: An electrophotographic photoconductor including a support, an undercoat layer, and a photoconductive layer, the undercoat layer and the photoconductive layer being disposed on the support in an order mentioned, wherein the undercoat layer includes zinc oxide particles, a urethane bond-containing resin, and methylethyl ketone oxime, and the undercoat layer satisfies a formula below: 10<M/L<400??(Formula) where M is a ratio (ppm) of the methylethyl ketone oxime included in the undercoat layer, and L is an average thickness (?m) of the undercoat layer.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: January 29, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiro Ishida, Tetsuro Suzuki, Eiji Kurimoto, Tomoharu Asano, Daisuke Nii
  • Publication number: 20190011845
    Abstract: Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat layer contains at least metal oxide particles, a binder, and a salicylic acid derivative such as 4-methylsalicylic acid, wherein the metal oxide particles have a volume resistivity of 1×105 ?·cm or higher but 1×108 ?·cm or lower, wherein the undercoat layer has a volume resistivity of 0.001×106 ?·cm or higher but 0.02×106 ?·cm or lower, and wherein the undercoat layer has a thickness of 2 micrometers or greater but 20 micrometers or less.
    Type: Application
    Filed: July 2, 2018
    Publication date: January 10, 2019
    Inventors: Tetsuya TOSHINE, Mitsuaki Hirose, Tomoharu Asano
  • 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: 9846377
    Abstract: A photoconductor includes an electroconductive substrate; an undercoat layer overlying the electroconductive substrate; and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a urethane resin, a metal oxide particle and a compound having the following formula (1): wherein R1 to R8 independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, a hydroxyl group, a saturated or an unsaturated aliphatic hydrocarbon group optionally having a substituent, an aromatic hydrocarbon group optionally having a substituent, an alkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, a sulfo group optionally having a substituent, an amino group, a dialkylamino group optionally having a substituent or an diarylamino group optionally having a substituent; and R3 and R4, R4 and R5, R6 and R7, and R7 and R8 may be bonded with each other to form an aromatic ring.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: December 19, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Eiji Kurimoto, Tetsuro Suzuki, Daisuke Nii, Toshihiro Ishida
  • Publication number: 20170343910
    Abstract: An electrophotographic photoconductor including a support, an undercoat layer, and a photoconductive layer, the undercoat layer and the photoconductive layer being disposed on the support in an order mentioned, wherein the undercoat layer includes zinc oxide particles, a urethane bond-containing resin, and methylethyl ketone oxime, and the undercoat layer satisfies a formula below: 10<M/L<400??(Formula) where M is a ratio (ppm) of the methylethyl ketone oxime included in the undercoat layer, and L is an average thickness (?m) of the undercoat layer.
    Type: Application
    Filed: May 22, 2017
    Publication date: November 30, 2017
    Inventors: Toshihiro ISHIDA, Tetsuro Suzuki, Eiji Kurimoto, Tomoharu Asano, Daisuke Nii
  • 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
  • Publication number: 20170307988
    Abstract: A photoconductor including a conductive support, an undercoat layer, a charge-generating layer, and a charge-transporting layer, at least the undercoat layer, the charge-generating layer, and the charge-transporting layer being disposed on the conductive support in an order mentioned, wherein the undercoat layer includes a binder resin and metal oxide particles, and the charge-generating layer includes a binder resin, a titanyl phthalocyanine pigment, and a salicylic acid derivative.
    Type: Application
    Filed: April 11, 2017
    Publication date: October 26, 2017
    Inventors: Tomoharu ASANO, Tetsuro Suzuki, Eiji Kurimoto, Daisuke Nii, Toshihiro Ishida
  • Patent number: 9766562
    Abstract: A photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, the undercoat layer being disposed over the conductive support, the photoconductive layer being disposed over the undercoat layer, wherein the undercoat layer includes zinc oxide particles, wherein when a film thickness of the undercoat layer is 20 ?m, the undercoat layer has transmittance of 50% or more to light having a wavelength in a range of 500 nm or more but 800 nm or less, wherein a lowest transmittance of light is 85% or less in the range, and wherein when an electric field of 5 V/?m is applied to the undercoat layer, volume resistivity of the undercoat layer is 1.0×107 ?·cm or more but 5.0×108 ?·cm or less at an environment of 23° C. and 55% RH.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: September 19, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiro Ishida, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Daisuke Nii
  • Patent number: 9753384
    Abstract: Provided is a photoconductor including a conductive support, an intermediate layer containing metal oxide particles, and a photoconductive layer. The intermediate layer and the photoconductive layer are provided over the conductive support in the order of reciting. An elastic power (We/Wt value) of the intermediate layer is greater than or equal to 20.0% but less than 35.0%. A Martens hardness (HM) of the intermediate layer is greater than or equal to 350 [N/mm2] but less than 450 [N/mm2].
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: September 5, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Daisuke Nii, Toshihiro Ishida
  • Patent number: 9678446
    Abstract: A electrophotographic photoconductor is provided. The electrophotographic photoconductor includes a conductive support, an undercoat layer overlying the conductive support, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a metal oxide particle, binder resin, and a compound having a urea group.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: June 13, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiro Ishida, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Daisuke Nii
  • Patent number: 9671706
    Abstract: An electrophotographic photoconductor including a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer is provided. The undercoat layer includes zinc oxide particles and a binder resin. The undercoat layer has a voltage (V)-current (I) characteristics such that, when S1 is a value obtained by integrating current (I [A]) in terms of voltage (V [V]) from 0 to a distribution voltage VUL [V] distributed to the undercoat layer, and S2 is a value obtained by integrating a line connecting two points at a voltage (V [V]) of 0 and the distribution voltage VUL [V] in terms of voltage (V [V]) from 0 to the distribution voltage VUL [V], S1 is within a range of from 1.0×10?4 to 1.0×10?2 and a ratio (S1/S2) of S1 to S2 is 0.50 or less.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: June 6, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Nii, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Toshihiro Ishida
  • Publication number: 20170153559
    Abstract: A photoconductor includes an electroconductive substrate; an undercoat layer overlying the electroconductive substrate; and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a urethane resin, a metal oxide particle and a compound having the following formula (1): wherein R1 to R8 independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, a hydroxyl group, a saturated or an unsaturated aliphatic hydrocarbon group optionally having a substituent, an aromatic hydrocarbon group optionally having a substituent, an alkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, a sulfo group optionally having a substituent, an amino group, a dialkylamino group optionally having a substituent or an diarylamino group optionally having a substituent; and R3 and R4, R4 and R5, R6 and R7, and R7 and R8 may be bonded with each other to form an aromatic ring.
    Type: Application
    Filed: October 21, 2016
    Publication date: June 1, 2017
    Inventors: Tomoharu ASANO, Eiji Kurimoto, Tetsuro Suzuki, Daisuke Nii, Toshihiro Ishida
  • Patent number: 9599916
    Abstract: An electrophotographic photoreceptor includes a substrate, an undercoat layer overlying the substrate, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a binder resin, a metal oxide particle and a compound having a thiol group.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: March 21, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Eiji Kurimoto, Tetsuro Suzuki, Daisuke Nii, Toshihiro Ishida
  • Publication number: 20160334720
    Abstract: A photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, the undercoat layer being disposed over the conductive support, the photoconductive layer being disposed over the undercoat layer, wherein the undercoat layer includes zinc oxide particles, wherein when a film thickness of the undercoat layer is 20 ?m, the undercoat layer has transmittance of 50% or more to light having a wavelength in a range of 500 nm or more but 800 nm or less, wherein a lowest transmittance of light is 85% or less in the range, and wherein when an electric field of 5 V/?m is applied to the undercoat layer, volume resistivity of the undercoat layer is 1.0×107 ?·cm or more but 5.0×108 ?·cm or less at an environment of 23° C. and 55% RH.
    Type: Application
    Filed: May 2, 2016
    Publication date: November 17, 2016
    Inventors: Toshihiro Ishida, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Daisuke Nii
  • Publication number: 20160327877
    Abstract: Provided is a photoconductor including a conductive support, an intermediate layer containing metal oxide particles, and a photoconductive layer. The intermediate layer and the photoconductive layer are provided over the conductive support in the order of reciting. An elastic power (We/Wt value) of the intermediate layer is greater than or equal to 20.0% but less than 35.0%. A Martens hardness (HM) of the intermediate layer is greater than or equal to 350 [N/mm2] but less than 450 [N/mm2].
    Type: Application
    Filed: April 20, 2016
    Publication date: November 10, 2016
    Inventors: Eiji KURIMOTO, Tetsuro SUZUKI, Tomoharu ASANO, Daisuke NII, Toshihiro ISHIDA