Patents by Inventor Yuka Miyamoto

Yuka Miyamoto 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).

  • Electrophotographic photoreceptor, method for manufacturing the photoreceptor, and image forming method and apparatus using the photoreceptor
    Patent number: 6844124
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate and including a resin; and a surface layer including a filler and a binder resin, wherein the surface layer and the photosensitive layer have a continuous structure, and wherein the surface layer satisfies the following relationship: ??D/5, wherein D represents an average of maximum thicknesses of the surface layer in units of micrometers in 20 segments of 5 ?m wide when a portion of a cross section of the photoreceptor of 100 ?m wide is divided into the 20 segments, and ? represents a standard deviation of the 20 maximum thicknesses.
    Type: Grant
    Filed: August 12, 2003
    Date of Patent: January 18, 2005
    Assignee: Ricoh Company Limited
    Inventors: Hiroshi Ikuno, Hidetoshi Kami, Ryohichi Kitajima, Narihito Kojima, Akihiko Matsuyama, Hiroshi Nagame, Katsuichi Ohta, Tetsuro Suzuki, Nozomu Tamoto, Hiroshi Tamura, Yohta Sakon, Eiji Kurimoto, Tatsuya Niimi, Yuka Miyamoto
  • Image forming apparatus
    Publication number: 20040151997
    Abstract: An image forming apparatus contains a photoconductor having a support and a photoconductive layer disposed thereon. I(S) at the surface of the photoconductor and I(S) at the interface of the photoconductive layer on the support side are 5.0×10−3 or less and the sum of I(S)s is 3.0×10−3 or more. I(S)s are determined according to following Equations 2 and 3 after subjecting a group of data of N samples of height×(t) [&mgr;m] of a profile curve at the surface or of one at the interface to discrete Fourier transform according to following Equation 1, the N samples being taken at intervals of &Dgr;t [&mgr;m] in a reference line direction.
    Type: Application
    Filed: August 18, 2003
    Publication date: August 5, 2004
    Inventors: Yuka Miyamoto, Toshiyuki Kabata
  • Electrophotographic photoreceptor, method for manufacturing the photoreceptor, and image forming method and apparatus using the photoreceptor
    Publication number: 20040048178
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate and including a resin; and a surface layer including a filler and a binder resin, wherein the surface layer and the photosensitive layer have a continuous structure, and wherein the surface layer satisfies the following relationship: &sgr;≦D/5, wherein D represents an average of maximum thicknesses of the surface layer in units of micrometers in 20 segments of 5 &mgr;m wide when a portion of a cross section of the photoreceptor of 100 &mgr;m wide is divided into the 20 segments, and &sgr; represents a standard deviation of the 20 maximum thicknesses.
    Type: Application
    Filed: August 12, 2003
    Publication date: March 11, 2004
    Inventors: Hiroshi Ikuno, Hidetoshi Kami, Ryohichi Kitajima, Narihito Kojima, Akihiko Matsuyama, Hiroshi Nagame, Katsuichi Ohta, Tetsuro Suzuki, Nozomu Tamoto, Hiroshi Tamura, Yohta Sakon, Eiji Kurimoto, Tatsuya Niimi, Yuka Miyamoto
  • Image forming apparatus, image forming method, process cartridge, photoconductor and method of preparing photoconductor
    Patent number: 6699631
    Abstract: An image forming apparatus including a photoconductor, and an exposing device for irradiating a surface of the photoconductor imagewise with a coherent light to form an electrostatic latent image thereon. The surface of the photoconductor has such roughness as to provide I(S) of at least 3.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: March 2, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuka Miyamoto, Toshiyuki Kabata, Tamotsu Aruga
  • Photoreceptor, method of evaluating a photoreceptor, and method of producing the photoreceptor
    Patent number: 6649313
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t) (&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t (&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated a
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: November 18, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Electrophotographic photoreceptor, method for manufacturing the photoreceptor, and image forming method and apparatus using the photoreceptor
    Patent number: 6641964
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate and including a resin; and a surface layer including a filler and a binder resin, wherein the surface layer and the photosensitive layer have a continuous structure, and wherein the surface layer satisfies the following relationship: &sgr;≦D/5, wherein D represents an average of maximum thicknesses of the surface layer in units of micrometers in 20 segments of 5 &mgr;m wide when a portion of a cross section of the photoreceptor of 100 &mgr;m wide is divided into the 20 segments, and &sgr; represents a standard deviation of the 20 maximum thicknesses.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: November 4, 2003
    Assignee: Ricoh Company Limited
    Inventors: Hiroshi Ikuno, Hidetoshi Kami, Ryohichi Kitajima, Narihito Kojima, Akihiko Matsuyama, Hiroshi Nagame, Katsuichi Ohta, Tetsuro Suzuki, Nozomu Tamoto, Hiroshi Tamura, Yohta Sakon, Eiji Kurimoto, Tatsuya Niimi, Yuka Miyamoto
  • Photoreceptor, method of evaluating a photoreceptor, and method of producing the photoreceptor
    Publication number: 20030175606
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t(&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated are
    Type: Application
    Filed: October 30, 2002
    Publication date: September 18, 2003
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Photoreceptor, method of evaluating the photoreceptor, method of producing the photoreceptor, and image formation apparatus using the photoreceptor
    Patent number: 6534227
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t(&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated are
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: March 18, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Image forming apparatus, image forming method, process cartridge, photoconductor and method of preparing photoconductor
    Publication number: 20020160287
    Abstract: An image forming apparatus including a photoconductor, and an exposing device for irradiating a surface of the photoconductor imagewise with a coherent light to form an electrostatic latent image thereon. The surface of the photoconductor has such roughness as to provide I(S) of at least 3.
    Type: Application
    Filed: February 20, 2002
    Publication date: October 31, 2002
    Inventors: Yuka Miyamoto, Toshiyuki Kabata, Tamotsu Aruga
  • Electrophotographic photoreceptor, method for manufacturing the photoreceptor, and image forming method and apparatus using the photoreceptor
    Publication number: 20020115005
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate and including a resin; and a surface layer including a filler and a binder resin, wherein the surface layer and the photosensitive layer have a continuous structure, and wherein the surface layer satisfies the following relationship: &sgr;≦D/5, wherein D represents an average of maximum thicknesses of the surface layer in units of micrometers in 20 segments of 5 &mgr;m wide when a portion of a cross section of the photoreceptor of 100 &mgr;m wide is divided into the 20 segments, and &sgr; represents a standard deviation of the 20 maximum thicknesses.
    Type: Application
    Filed: November 2, 2001
    Publication date: August 22, 2002
    Inventors: Hiroshi Ikuno, Hidetoshi Kami, Ryohichi Kitajima, Narihito Kojima, Akihiko Matsuyama, Hiroshi Nagame, Katsuichi Ohta, Tetsuro Suzuki, Nozomu Tamoto, Hiroshi Tamura, Yohta Sakon, Eiji Kurimoto, Tatsuya Niimi, Yuka Miyamoto
  • Photoreceptor, method of evaluting the photoreceptor, method of producing the photoreceptor, and image formation apparatus using the photoreceptor
    Publication number: 20020018947
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t (&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated ar
    Type: Application
    Filed: January 12, 2001
    Publication date: February 14, 2002
    Applicant: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto