Patents by Inventor Sayo Uemura
Sayo Uemura 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).
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Patent number: 8249489Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, and a magnetic roller which forms a magnetic brush with a two-component developing agent having carrier and the toner and thereby forms a toner layer on the developing roller, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.Type: GrantFiled: July 15, 2011Date of Patent: August 21, 2012Assignee: Kyocera Document Solutions Inc.Inventors: Hiroyuki Hamakawa, Akihiro Watanabe, Masashi Fujishima, Hiroshi Yamazaki, Asami Kotera, Sayo Uemura
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Publication number: 20110268479Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, and a magnetic roller which forms a magnetic brush with a two-component developing agent having carrier and the toner and thereby forms a toner layer on the developing roller, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.Type: ApplicationFiled: July 15, 2011Publication date: November 3, 2011Applicant: KYOCERA MITA CORPORATIONInventors: Hiroyuki HAMAKAWA, Akihiro WATANABE, Masashi FUJISHIMA, Hiroshi YAMAZAKI, Asami KOTERA, Sayo UEMURA
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Patent number: 8010025Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.Type: GrantFiled: January 12, 2009Date of Patent: August 30, 2011Assignee: Kyocera Mita CorporationInventors: Hiroyuki Hamakawa, Akihiro Watanabe, Masashi Fujishima, Hiroshi Yamazaki, Asami Kotera, Sayo Uemura
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Patent number: 7937008Abstract: An image forming apparatus having a touchdown-development type developing apparatus, in which a toner collecting roller that collects scattered toner suspended in the vicinity of a toner holding body and a two-component developer holding body is arranged on the downstream side in a rotational direction of the two-component developer holding body from a closest position of the two-component developer holding body and the toner holding body, and between the two-component developer holding body and the housing wall, and further, bias means that applies a bias voltage for collecting the scattered toner to the toner collecting roller, and image density sensing means for sensing a density of a toner image developed on the electrostatic latent image holding body surface or a toner image on a transfer body onto which the toner image developed on the electrostatic latent image holding body surface is transferred to control the bias voltage are provided.Type: GrantFiled: February 12, 2008Date of Patent: May 3, 2011Assignee: Kyocera Mita CorporationInventors: Masashi Fujishima, Akihiro Watanabe, Sayo Uemura, Yukihiro Mori
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Patent number: 7826782Abstract: A developing device is provided for visualizing an electrostatic latent image previously formed on the surface of an image carrier as a toner image. The developing device has a developing roller placed at a position facing the image carrier, carrying a toner on the surface thereof, conveying the toner and flying the conveyed toner onto the surface of the image carrier; and a resin layer coated on the surface of the developing roller. The absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner carried on the developing roller is 6 ?C/g or less.Type: GrantFiled: December 10, 2008Date of Patent: November 2, 2010Assignee: Kyocera Mita CorporationInventors: Asami Kotera, Hiroyuki Hamakawa, Akihiro Watanabe, Masashi Fujishima, Hiroshi Yamazaki, Sayo Uemura
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Patent number: 7773921Abstract: An image forming apparatus includes a latent image carrying member, a two-component developer carrying member holding on an outer surface a developer containing carrier beads and toner particles, the two-component developer carrying member having a first magnetic element mounted therein, a toner carrying member carrying a thin toner layer on an outer surface, a toner collecting roller for collecting the toner particles scattered and suspended in the vicinity of the two-component developer carrying member and the toner carrying member, the toner collecting roller having a second magnetic element mounted therein, and a housing accommodating the two-component developer carrying member, the toner carrying member and the toner collecting roller. The toner collecting roller is located face to face with the two-component developer carrying member with the first and second magnetic elements disposed to face each other with oppositely directed polarities.Type: GrantFiled: January 25, 2008Date of Patent: August 10, 2010Assignee: Kyocera Mita CorporationInventors: Masashi Fujishima, Kiyotaka Kobayashi, Yuki Matsui, Yukihiro Mori, Sayo Uemura, Akihiro Watanabe
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Publication number: 20090180818Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.Type: ApplicationFiled: January 12, 2009Publication date: July 16, 2009Inventors: Hiroyuki HAMAKAWA, Akihiro WATANABE, Masashi FUJISHIMA, Hiroshi YAMAZAKI, Asami KOTERA, Sayo UEMURA
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Publication number: 20090154962Abstract: A developing device visualizing an electrostatic latent image previously formed on the surface of an image carrier as toner image, comprising: a developing roller placed at a position facing the image carrier, carrying a toner on the surface thereof, conveying the toner and flying the conveyed toner onto the surface of the image carrier; and a resin layer coated on the surface of the developing roller, wherein the absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner carried on the developing roller is 6 ?C/g or less.Type: ApplicationFiled: December 10, 2008Publication date: June 18, 2009Applicant: KYOCERA MITA CORPORATIONInventors: Asami Kotera, Hiroyuki Hamakawa, Akihiro Watanabe, Masashi Fujishima, Hiroshi Yamazaki, Sayo Uemura
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Publication number: 20080206661Abstract: An image forming apparatus having a touchdown-development type developing apparatus, in which a toner collecting roller that collects scattered toner suspended in the vicinity of a toner holding body and a two-component developer holding body is arranged on the downstream side in a rotational direction of the two-component developer holding body from a closest position of the two-component developer holding body and the toner holding body, and between the two-component developer holding body and the housing wall, and further, bias means that applies a bias voltage for collecting the scattered toner to the toner collecting roller, and image density sensing means for sensing a density of a toner image developed on the electrostatic latent image holding body surface or a toner image on a transfer body onto which the toner image developed on the electrostatic latent image holding body surface is transferred to control the bias voltage are provided.Type: ApplicationFiled: February 12, 2008Publication date: August 28, 2008Inventors: Masashi Fujishima, Akihiro Watanabe, Sayo Uemura, Yukihiro Mori
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Publication number: 20080181675Abstract: An image forming apparatus includes a latent image carrying member, a two-component developer carrying member holding on an outer surface a developer containing carrier beads and toner particles, the two-component developer carrying member having a first magnetic element mounted therein, a toner carrying member carrying a thin toner layer on an outer surface, a toner collecting roller for collecting the toner particles scattered and suspended in the vicinity of the two-component developer carrying member and the toner carrying member, the toner collecting roller having a second magnetic element mounted therein, and a housing accommodating the two-component developer carrying member, the toner carrying member and the toner collecting roller. The toner collecting roller is located face to face with the two-component developer carrying member with the first and second magnetic elements disposed to face each other with oppositely directed polarities.Type: ApplicationFiled: January 25, 2008Publication date: July 31, 2008Applicant: Kyocera Mita CorporationInventors: Masashi Fujishima, Kiyotaka Kobayashi, Yuki Matsui, Yukihiro Mori, Sayo Uemura, Akihiro Watanabe