Patents by Inventor Jun Aoto

Jun Aoto 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: 5774775
    Abstract: An image forming method wherein a toner image on an image carrier is transferred in a first transfer step to an intermediate image transfer element, the transferred toner image on said intermediate image transfer element being subsequently transferred in a second transfer step to a transfer medium. The intermediate image transfer element has a surface whose angle of contact with water is at least 70 degrees and whose position in the triboelectric series is on a positive side with respect to the position of said toner when the toner on the image carrier is negatively charged and on a negative side with respect to the position of the toner when the toner on the image carrier is positively charged.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: June 30, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Aoto, Yasuo Hirano, Masahide Yamashita, Mitsuru Seto, Shigeru Fukuda
  • Patent number: 5761594
    Abstract: In an image forming apparatus of the type transferring a plurality of toner images of different colors sequentially formed on an image carrier sequentially to an endless intermediate transfer body one above the other by primary transfer, and then transferring the resulting composite color image to a transfer medium by secondary transfer, the intermediate transfer body is provided with surface energy, surface tension or adhering force which is greater than or equal to the corresponding value of the image carrier, but smaller than or equal to the corresponding value of the transfer medium.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: June 2, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Seto, Shigeru Fukuda, Yasuo Hirano, Jun Aoto, Masahide Yamashita, Takashi Bisaiji, Makoto Ohsaki, Takeshi Shintani
  • Patent number: 5741616
    Abstract: A method of developing latent electrostatic images and a developer-bearing member for use in the method are disclosed, which method includes the steps of (a) forming numerous micro closed electric fields near the surface of a rotatable developer-bearing member which comprises an electroconductive support and a surface layer formed thereon comprising an electroconductive organic polymeric matrix and numerous minute charge-retainable insulating segments distributed at least one the surface of the surface layer, by electrically charging the surface of the charge-retainable insulating segments; (b) supplying a one-component type developer comprising toner particles to the rotatable developer-bearing member to hold the developer on the rotatable developer-bearing member to hold the developer on the rotatable developer-bearing member by the numerous micro closed electric fields; and (c) bringing the rotatable developer-bearing member near or into contact with a latent-electrostatic-image-bearing member which bears
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: April 21, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Hirano, Jun Aoto, Kazuo Nojima, Koji Suzuki, Hiroshi Takashima, Shigekazu Enoki, Yuichi Ueno, Naoki Iwata
  • Patent number: 5655199
    Abstract: An intermediate transfer type image forming apparatus for sequentially performing primary and secondary image transfer with the intermediary of an intermediate transfer medium implemented as, e.g., a belt, and the intermediate transfer member are disclosed. The image transfer medium has a lower surface resistivity on its rear than on its front or image carrying surface.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: August 5, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahide Yamashita, Yasuo Hirano, Jun Aoto, Mitsuru Seto, Shigeru Fukuda
  • Patent number: 5379097
    Abstract: A development apparatus including a developer-bearing-member for developing latent electrostatic images formed on a latent-electrostatic-image-bearing member to visible toner images by the application thereto of a non-magnetic one-component developer including matrix toner particles and a fluidity-imparting agent; and a developer-thin-layer-regulating member for forming a thin layer of the non-magnetic one-component developer on the surface of the developer-bearing member, the developer-bearing member having a surface portion which is intermediate between the matrix toner particles and the fluidity-imparting agent in the triboelectric series thereof.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: January 3, 1995
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Aoto, Yasuo Hirano
  • Patent number: 5266436
    Abstract: A developer-bearing member with the surface thereof being composed of minute dielectric portions and minute electroconductive portions which are mixedly distributed, the dielectric portions containing an amino coupling agent, is used in an image formation method including the steps of forming numerous micro closed electric fields near the surface of the developer-bearing member by causing the developer-bearing member to selectively hold electric charges on the surface thereof, supplying a non-magnetic one-component type developer containing a toner to the surface of the developer-bearing member to hold the toner on the surface of the developer-bearing member by the micro closed electric fields, and developing a latent electrostatic image formed on a latent-electrostatic-image bearing member to a visible toner image by the toner.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: November 30, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Aoto, Yasuo Hirano
  • Patent number: 5168312
    Abstract: A development unit including (i) a latent-electrostatic-image-bearable member, (ii) a development member for supporting a toner thereon and developing latent electrostatic images formed on the latent-electrostatic-image-bearable member into visible toner images with the toner, and (iii) a toner layer regulating member for regulating the thickness of a toner layer formed on the development member, wherein at least the development member or toner layer regulating member has an overcoat layer including a resin and a surface active agent.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: December 1, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Aoto, Yasuo Hirano
  • Patent number: 5142330
    Abstract: A development unit comprising a development roller for developing a latent electrostatic image formed on an electrophotographic photoconductor to a visible toner image by applying a non-magnetic one-component type toner thereto, and a toner layer thickness regulation member for forming a toner layer on the above development roller, which toner layer thickness regulation member comprises at least (a) a rubber-like fluorosilicone polymer including repeat units of formula (I), (b) a silicone polymer comprising a copolymer of dimethyl silicone and methyl vinyl silicone with a crosslinking density of 4.times.10.sup.-4 to 8.times.10.sup.-4 mol/cc, and (c) an alkylene-oxide-addition type fluorine-containing surface active agent: ##STR1## wherein n is 1,000 to 600,000.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: August 25, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Hirano, Jun Aoto
  • Patent number: 5099285
    Abstract: A development apparatus including a development roller for developing a latent electrostatic image formed on an electrophotographic photoconductor to a visible toner image by applying a non-magnetic one-component toner thereto, in which a surface layer of the development roller includes a fluorosilcone polymer including repeating units of formula (I): ##STR1##
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: March 24, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Hirano, Jun Aoto