Patents by Inventor Keiichi Murai

Keiichi Murai 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: 4797327
    Abstract: A surface treated metal member comprises a metal member having unevenness with a plurality of spherical mark impressions formed on the surface.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: January 10, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Tetsuo Sueda, Keiichi Murai, Kyosuke Ogawa
  • Patent number: 4797299
    Abstract: A light receiving member comprises a support and a light receiving layer having a photosensitive layer composed of a-Si(Ge,Sn)(H,X) or a-Si(Ge,Sn)(O,C,N)(H,X) and a surface layer composed of A-Si(O,C,N)(H,X), said support having a surface provided with irregularities composed of spherical dimples, each of which has an inside face provided with minute irregularities. The optical band gap possessed by the surface layer and the optical band gap possessed by the photosensitive layer on which the surface layer is disposed are matched at their interface. The light receiving member can effectively prevent the occurrence of interference fringes in the formed images. In addition, the light-receiving member forms visible images of excellent quality even when coherent laser beams are used as the light source. The member also effectively prevents reflection of incident light at the interface between the surface layer and the photosensitive layer.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: January 10, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4797336
    Abstract: There is provided a light receiving member which comprises a support, a photosensitive layer composed of amorphous material containing silicon atoms and at least either germanium atoms or tin atoms and a surface layer, said surface layer being of multi-layered structure having at least an abrasion-resistant layer at the outermost side and a reflection preventive layer in the inside, and said support having a surface provided with irregularities composed of spherical dimples each of which having an inside face provided with minute irregularities. The light receiving member overcomes all of the problems in the conventional light receiving member comprising a light receiving layer composed of an amorphous silicon and, in particular, effectively prevents the occurrence of interference fringe in the formed images due to the interference phenomenon thereby forming visible images of excellent quality even in the case of using coherent laser beams possible producing interference as a light source.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: January 10, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4773244
    Abstract: An apparatus suitable for fabricating a substrate suitable for photoconductive members has a cylindrical rotating vessel surrounded by a housing which contains a plurality of rigid spheres therein. A substrate supporting means is placed within the cylindrical rotating vessel so as to be rotatable coaxially therewith. A supplying means for a surface coating liquid, such as polybutene, is placed at an upper position over the external wall face of the cylindrical rotating vessel. A reservoir for the surface coating liquid is placed at a lower position below the external wall face of the cylindrical rotating vessel. A means to circulate the surface coating liquid to the supplying means is employed.
    Type: Grant
    Filed: November 7, 1986
    Date of Patent: September 27, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4762762
    Abstract: A light receiving member comprises a support and a light receiving layer of a multi-layered structure having at least a photosensitive layer composed of an amorphous silicon, said support having a surface provided with irregularities composed of spherical dimples each of which having an inside face provided with minute irregularities. The light receiving layer may contain a surface layer comprising an outer abrasion-resistant layer and an inner reflection prevention layer, wherein the optical band gap possessed by the surface layer and optical band gap possessed by the photosensitive layer on which the surface layer is disposed are matched at their interface. The light receiving member can effectively prevent the occurrence of interference fringes in the formed images, forming visible images of excellent quality even when coherent laser beams are used as the light source.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: August 9, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4740440
    Abstract: There is provided a light receiving member which comprises a support, a photosensitive layer and a surface layer, said photosensitive layer being composed of amorphous material containing silicon atoms, and at least either germanium atoms or tin atoms and said surface layer being composed of amorphous material containing silicon atoms and at least one kind selected from oxygen atoms, carbon atoms and nitrogen atoms, said support having a surface provided with irregularities composed of spherical dimples, and an optical band gap being matched at the interface between said photosensitive layer and said surface layer.
    Type: Grant
    Filed: October 16, 1986
    Date of Patent: April 26, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4735883
    Abstract: A photoconductive member having a photoconductive layer on a supporting member, said supporting member comprises a metal member having unevenness with a plurality of spherical mark impressions formed on the surface.
    Type: Grant
    Filed: April 3, 1986
    Date of Patent: April 5, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Tetsuo Sueda, Keiichi Murai, Kyosuke Ogawa
  • Patent number: 4732834
    Abstract: There is provided a light receiving member which comprises a support and a light receiving layer having a photosensitive layer composed of amorphous material containing silicon atoms and at least either germanium atoms or tin atoms and a surface layer, said surface layer being of multi-layered structure having at least an abrasion-resistant layer at the outermost side and a reflection preventive layer in the inside, and said support having a surface provided with irregularities composed of spherical dimples. The light receiving member overcomes all of the problems in the conventional light receiving member comprising a light receiving layer composed of an amorphous silicon and, in particular, effectively prevents the occurrence of interference fringe in the formed images due to the interference phenomenon thereby forming visible images of excellent quality even in the case of using coherent laser beams possible producing interference as a light source.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: March 22, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • 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
  • Patent number: 4364329
    Abstract: An abrasive member for electrophotographic image-holding member comprising an abrasive dispersed in a resin of linear structure.
    Type: Grant
    Filed: September 26, 1980
    Date of Patent: December 21, 1982
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keiichi Murai, Naoto Tanaka, Hideyo Kondo
  • Patent number: 4308331
    Abstract: The invention concerns a screen photosensitive member, and an electrophotographic method using such screen photosensitive member, and relates to improvement in the screen constructed with an electrically conductive member, a photoconductive layer provided on the electrically conductive member, and a surface insulative layer constituting the screen surface at the side opposite to at least a modulating corona source. More particularly, the screen according to the present invention is further provided, at the side of the modulating corona source, with a potential holding layer which holds thereon corona ions applied to it and maintains the surface of the screen at the side of the modulating corona source at a predetermined potential.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: December 29, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noboru Narita, Keiichi Murai, Teruo Misumi
  • Patent number: 4298670
    Abstract: This invention is directed to photosensitive material for electrophotography and more particularly it is directed to the improvement of the properties with respect to humidity of photosensitive material by using photoconductive material in combination with ion exchange resin or by using photoconductive material which is previously washed in an aqueous solution in the presence of ion exchange resin.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: November 3, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keiichi Murai, Takehiko Matsuo
  • Patent number: 4279500
    Abstract: An electrophotographic apparatus includes an image holding member which is adapted to retain electrostatic images as well as toner images. The image holding member contains a lubricating agent inside the surface layer. To expose a new surface of the member to provide additional lubricating agent, a means to abrade the surface layer is also provided.
    Type: Grant
    Filed: April 27, 1979
    Date of Patent: July 21, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideyo Kondo, Keiichi Murai
  • Patent number: 4203764
    Abstract: An image holding member for holding electrostatic latent images and/or toner images is characterized in that the surface of the image holding member has a surface layer formed by a coating, said surface layer essentially consisting of at least one of substances A and B wherein the substance A is a linear polyester resin soluble in organic solvents and the substance B is a copolymerization product of a linear isocyanate of the formula: ##STR1## and a polyol of the formula: HO--(CH.sub.2).sub.n --OH wherein n is a positive integer.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: May 20, 1980
    Assignee: Canon Kabushiki Kaisha
    Inventors: Umi Tosaka, Hideyo Kondo, Keiichi Murai, Hitoshi Toma
  • Patent number: 4183748
    Abstract: This invention is directed to photosensitive material for electrophotography and more particularly it is directed to the improvement of the properties with respect to humidity of photosensitive material by using photoconductive material in combination with ion exchange resin or by using photoconductive material which is previously washed in an aqueous solution in the presence of ion exchange resin.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: January 15, 1980
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keiichi Murai, Takehiko Matsuo