Patents by Inventor Tadaji Fukuda

Tadaji Fukuda 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 method using a cleaning blade to remove residual toner
    Patent number: 5756250
    Abstract: An electrophotographic apparatus employs a charger for charging a cylindrical photosensitive member having a photoconductive layer of amorphous silicon containing 10 to 40 atomic % hydrogen; an exposing station for imagewise exposing the member to form an electrostatic latent image; a developer station for developing the latent image to form a toner image; a transfer station for transferring the toner image to an image receiving sheet and a blade for cleaning the surface of the cylindrical member.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 26, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda
  • Image forming member for electrophotography
    Patent number: 5753936
    Abstract: An image-forming member for electro-photography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 19, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda
  • Electrophotographic photosensitive member and process for production thereof
    Patent number: 5658703
    Abstract: A layer of amorphous silicon containing H, preferably 10-40 atomic % H, is used as a photoconductive layer for electrophotographic photosensitive member.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 19, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda
  • Electrophotographic method using a cleaning blade to remove residual toner
    Patent number: 5640663
    Abstract: An electrophotographic process is conducted by charging a cylindrical photosensitive member having a photoconductive layer of amorphous silicon containing 10 to 40 atomic % hydrogen; imagewise exposing the member to form an electrostatic latent image; developing the latent image to form a toner image; transferring the toner image to an image receiving sheet and thereafter cleaning the surface of the cylindrical member with a cleaning blade.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 17, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda
  • CVD method for forming a photoconductive hydrogenated a-Si layer
    Patent number: 5585149
    Abstract: A layer of amorphous silicon containing H, preferably 10-40 atomic % H, which is used as a photoconductive layer for electrophotographic photosensitive member, is formed by plasma CVD using a silane gas of a higher than monosilane.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: December 17, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda
  • Photoconductive member
    Patent number: 5582945
    Abstract: A photoconductive member, comprises a support for a photoconductive member and an amorphous layer which is constituted of silicon atoms as matrix containing at least one of hydrogen atom and halogen atom and exhibits photo-conductivity, said amorphous layer having a layer region containing carbon atoms in at least a part thereof, the content of the carbon atoms in said layer region being distributed unevenly in the direct on of the thickness of said layer.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 10, 1996
    Inventors: Shigeru Shirai, Junichiro Kanbe, Tadaji Fukuda
  • Glow discharge process for making photoconductive member
    Patent number: 5582947
    Abstract: A photoconductive member, comprises a support for a photoconductive member and an amorphous layer which is constituted of silicon atoms as matrix containing at least one of hydrogen atom and halogen atom and exhibits photoconductivity, said amorphous layer having a layer region containing carbon atoms in at least a part thereof, the content of the carbon atoms in said layer region being distributed unevenly in the direction of the thickness of said layer.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: December 10, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeru Shirai, Junichiro Kanbe, Tadaji Fukuda
  • Image-forming member for electrophotography
    Patent number: 5573884
    Abstract: An image-forming member for electro-photography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: November 12, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda
  • Method of making electrophotographic member
    Patent number: 5561024
    Abstract: An image forming member for electrophotography constructed with a substrate and a photoconductive layer formed thereon, wherein the photoconductive layer comprising an amorphous material containing therein silicon atom as the matrix and halogen atom as the constituent atom.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: October 1, 1996
    Inventors: Tadaji Fukuda, Toshiyuki Komatsu
  • Electrophotographic image forming member
    Patent number: 5382487
    Abstract: An image forming member for electrophotography constructed with a substrate and a photoconductive layer formed thereon, wherein the photoconductive layer comprising an amorphous material containing therein silicon atom as the matrix and halogen atom as the constituent atom.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: January 17, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadaji Fukuda, Toshiyuki Komatsu
  • Photoconductive member
    Patent number: 5258250
    Abstract: A photoconductive member, comprises a support for a photoconductive member and an amorphous layer which is constituted of silicon atoms as matrix containing at least one of hydrogen atom and halogen atom and exhibits photoconductivity, said amorphous layer having a layer region containing carbon atoms in at least a part thereof, the content of the carbon atoms in said layer region being distributed unevenly in the direction of the thickness of said layer.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: November 2, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeru Shirai, Junichiro Kanbe, Tadaji Fukuda
  • Method of forming a photoconductive member with silicon, hydrogen and/or halogen and carbon
    Patent number: 5141836
    Abstract: A photoconductive member, comprises a support for a photoconductive member and an amorphous layer which is constituted of silicon atoms as matrix containing at least one of hydrogen atom and halogen atom and exhibits photoconductivity, said amorphous layer having a layer region containing carbon atoms in at least a part thereof, the content of the carbon atoms in said layer region being distributed unevenly in the direction of the thickness of said layer.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: August 25, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeru Shirai, Junichiro Kanbe, Tadaji Fukuda
  • Aluminum support for a photoconductive member
    Patent number: 4876185
    Abstract: A photoconductive member has a support comprising aluminum as the main component and a photoconductive layer. The photoconductive layer is provided on the support and contains an amorphous material comprising silicon atoms as a matrix. The support comprises an aluminum alloy with a Fe content of 2000 ppm by weight or less.
    Type: Grant
    Filed: July 9, 1987
    Date of Patent: October 24, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuyuki Matsumoto, Keiichi Murai, Tadaji Fukuda, Kyosuke Ogawa
  • CVD process for forming an image forming member for electrophotography
    Patent number: 4830946
    Abstract: An image-forming member for electrophotography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: May 16, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda
  • Image forming member for electrophotography
    Patent number: 4818656
    Abstract: An electrophotographic image forming member comprises a substrate and a photoconductive layer overlying the substrate and composed of a hydrogenated amorphous silicon containing 0.001-1000 atomic ppm of carbon as an impurity based on silicon.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: April 4, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadaji Fukuda, Yutaka Hirai, Katsumi Nakagawa, Toshiyuki Komatsu
  • Photoconductive member and support for said photoconductive member
    Patent number: 4814248
    Abstract: A photoconductive member comprises a drum-shaped substrate and a photoconductive layer which is provided on the drum-shaped substrate and contains an amorphous material comprising silicon atoms as a matrix, and said drum-shaped substrate has a thickness of 2.5 mm or more.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: March 21, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoko Kamata, Tadaji Fukuda
  • CVD process for forming semiconducting film having hydrogenated germanium matrix
    Patent number: 4745041
    Abstract: An image-forming member for electrophotography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: May 17, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda
  • Photoconductive member and support for said photoconductive member
    Patent number: 4702981
    Abstract: A photoconductive member has a support comprising aluminum as the main component and a photoconductive layer. The photoconductive layer is provided on the support and contains an amorphous material comprising silicon atoms as a matrix. The support comprises an aluminum alloy with a Fe content of 2000 ppm by weight or less.
    Type: Grant
    Filed: June 6, 1986
    Date of Patent: October 27, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuyuki Matsumoto, Keiichi Murai, Tadaji Fukuda, Kyosuke Ogawa
  • Image-forming member for electrophotography
    Patent number: 4670369
    Abstract: Image-forming member for electrophotography comprising a charge generation layer composed of hydrogenated amorphous silicon.
    Type: Grant
    Filed: June 11, 1986
    Date of Patent: June 2, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsumi Nakagawa, Toshiyuki Komatsu, Yutaka Hirai, Teruo Misumi, Tadaji Fukuda
  • Image forming member for electrophotography
    Patent number: RE35198
    Abstract: Image-forming member for electrophotography comprising a charge generation layer composed of hydrogenated amorphous silicon.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: April 2, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsumi Nakagawa, Toshiyuki Komatsu, Yutaka Hirai, Teruo Misumi, Tadaji Fukuda