Having Carrier Particles (i.e., Multicomponent Developer) Patents (Class 430/45.56)
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Patent number: 11079702Abstract: An image forming apparatus includes a photosensitive member, a rotatable intermediate transfer belt configured to come into contact with a photosensitive member at a first contact portion on an outer peripheral surface thereof, and, a transfer member configured to come into contact with an inner peripheral surface of the intermediate transfer belt at a second contact portion. The transfer member is disposed such that an upstream end of the second contact portion is positioned downstream of a downstream end of the first contact portion in the rotation direction of the intermediate transfer belt. In a case where a surface resistivity measured on the outer peripheral surface of the intermediate transfer belt is G and a surface resistivity measured on the inner peripheral surface of the intermediate transfer belt is N, 0.75?N/G?1.2 is satisfied.Type: GrantFiled: December 4, 2019Date of Patent: August 3, 2021Assignee: Canon Kabushiki KaishaInventors: Tomohiro Saito, Kenta Matsuzaki, Shozo Aiba
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Patent number: 7835028Abstract: An image forming apparatus includes an image holding member, a toner image forming unit, a color forming information applying unit, a transfer unit, a fixing unit and a color forming unit, the color forming information applying unit exposing a toner image formed on a surface of the image holding member from a back surface side of the image holding member, light transmitted through the image holding member applying color forming information to the toner image.Type: GrantFiled: November 24, 2006Date of Patent: November 16, 2010Assignee: Fuji Xerox Co., Ltd.Inventor: Isao Ito
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Patent number: 7767370Abstract: A two-component developer containing a magenta toner and a magnetic carrier, wherein the magenta toner has the characteristics: (i) when the concentration of the magenta toner in a solution of the magenta toner in chloroform is represented by Cm (mg/ml) and the absorbance of the solution at a wavelength of 538 nm is represented by A538, a relationship between Cm and A538 satisfies the relationship of 2.00<A538/Cm<6.55; (ii) the lightness L* and chroma C* of the magenta toner determined in a powder state satisfy the relationships of 35?L*?45 and 60?C*?72; and (iii) the absolute value for the triboelectric charge quantity of the magenta toner measured by a two-component method using the magenta toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.Type: GrantFiled: July 29, 2008Date of Patent: August 3, 2010Assignee: Canon Kabushiki KaishaInventors: Koh Ishigami, Kazuo Terauchi, Noriyoshi Umeda, Tetsuya Ida, Naoki Okamoto, Yojiro Hotta, Yoshinobu Baba, Takayuki Itakura, Takeshi Yamamoto, Manami Haraguchi, Kenta Kubo
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Patent number: 7592115Abstract: A carrier for electrostatic latent image developer, including a core material and at least two or more resin-coated layers formed on the surface of the core material, wherein the resin-coated layers include a siloxane bond-containing coating resin containing an organic metal compound and a conductive material, the metal contained in the organic metal compound in the innermost resin-coated layer has an ionization potential of less than 7 eV, and the metal contained in the organic metal compound in the outermost resin-coated layer has an ionization potential of 7 eV or more.Type: GrantFiled: October 14, 2005Date of Patent: September 22, 2009Assignee: Fuji Xerox Co., Ltd.Inventors: Yasushige Nakamura, Sadaaki Yoshida
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Patent number: 7521160Abstract: An image forming method, including the steps of: charging each surface of a plurality of amorphous-silicon-based photoreceptors; exposing the each surface of the amorphous-silicon-based photoreceptors to form respective color latent images of yellow, magenta, cyan and black; developing the respective color latent images with corresponding color toners to form respective color visible toner images; and transferring the respective color toner images successively to be piled up on a toner image receiving member, wherein the color toner of each color contains grains having volume average grain size (D4) of 3-7 ?m and number average primary grain size of 40-800 nm, and the relationship of 1.04?B/A?1.4 (6?A?30) is satisfied between an exposure size (A ?m) in the main scanning direction in the exposing step and a development size (B ?m) corresponding to the exposure size (A ?m) in the developing step.Type: GrantFiled: July 22, 2004Date of Patent: April 21, 2009Assignee: Konica Minolta Business Technologies, Inc.Inventors: Ken Ohmura, Hiroshi Yamazaki
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Publication number: 20080014514Abstract: A developer which contains a toner manufactured in a wet method and a carrier, forms an image which has enhanced image density, image reproducibility, etc., and prevents image defects such as fog from being generated. As the toner manufactured in the wet method, there is used a toner which is obtained in a production method including an admixture preparing step (S1), an aggregate forming step (S2), a particle forming step (S3), and a cleaning step (S4) and which contains pigment and self-dispersible resin containing self-dispersible polyester having an acid number of 1 mgKOH/g to 30 mgKOH/g. As the carrier, there is used a carrier composed of a core material and a coating layer which contains conductive particles formed on a surface of the core material, preferably, a coating layer which is made of a silicone resin composition containing silicone resin and conductive particles.Type: ApplicationFiled: July 12, 2007Publication date: January 17, 2008Applicant: SHARP KABUSHIKI KAISHAInventor: Takanori Kamoto
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Publication number: 20070298336Abstract: A carrier coating that may be used to coat carrier particles, including a specific additive that imparts the coating with superior storage stability and wherein the carrier coating includes an acrylic-based polymeric powder obtained from an emulsion of an acrylic-based polymer, a surfactant, a cationic initiator, and a conductive filler.Type: ApplicationFiled: June 23, 2006Publication date: December 27, 2007Applicant: Xerox CorporationInventors: Robert Bayley, Grazyna Kmiecik-Lawrynowicz, Maura Sweeney
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Publication number: 20070172748Abstract: The present invention provides a composite color image forming method. The method includes electrically charging a latent image-holding member; exposing the charged latent image-holding member to light to form an electrostatic latent image; developing the electrostatic latent image with a two-component developer containing toner particles of one color and a carrier to form a toner image on the latent image-holding member; primarily transferring the toner image from the latent image-holding member to an intermediate transfer member; repeating the electrically charging, the exposing, the developing, and the primarily transferring, while the toner particles are replaced with toner particles of different color, to form a composite color image on the intermediate transfer member; and secondarily transferring the composite color image from the intermediate transfer member to a recording medium.Type: ApplicationFiled: August 16, 2006Publication date: July 26, 2007Applicant: FUJI XEROX CO., LTD.Inventors: Satoshi Inoue, Koutarou Yoshihara, Yosuke Tsurumi, Moegi Iguchi, Masahiro Takagi