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公开(公告)号：US11852989B2
公开(公告)日：2023-12-26
申请号：US18098851
申请日：2023-01-19
Applicant: CANON KABUSHIKI KAISHA
Inventor： Osamu Ariizumi
CPC classification number: G03G15/0812 , G03G9/107 , G03G15/0808 , G03G15/0818 , G03G21/0064
Abstract: A developing device includes first and second chambers, a partition wall, first and second feeding screws, a developing roller, a supplying roller, a first magnet including a first magnetic pole, a second magnet including second to fourth magnetic poles, and a guiding portion. With respect to a supplying roller rotational direction, in a position downstream of the third magnetic pole, a magnetic flux density of the fourth magnetic pole in a normal direction is 20% of a maximum value thereof is a first position positioned downstream of a second position where a line connecting a lowermost end of the guiding portion and a supplying roller center crosses an outer peripheral surface of the supplying roller, and upstream of a third position where a line connecting an uppermost end of the first feeding screw and the supplying roller center crosses the outer peripheral surface of the supplying roller.
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公开(公告)号：US20230251590A1
公开(公告)日：2023-08-10
申请号：US18098851
申请日：2023-01-19
Applicant: CANON KABUSHIKI KAISHA
Inventor： Osamu Ariizumi
CPC classification number: G03G15/0812 , G03G9/107 , G03G15/0808 , G03G15/0818 , G03G21/0064
Abstract: A developing device includes first and second chambers, a partition wall, first and second feeding screws, a developing roller, a supplying roller, a first magnet including a first magnetic pole, a second magnet including second to fourth magnetic poles, and a guiding portion. With respect to a supplying roller rotational direction, in a position downstream of the third magnetic pole, a magnetic flux density of the fourth magnetic pole in a normal direction is 20 % of a maximum value thereof is a first position positioned downstream of a second position where a line connecting a lowermost end of the guiding portion and a supplying roller center crosses an outer peripheral surface of the supplying roller, and upstream of a third position where a line connecting an uppermost end of the first feeding screw and the supplying roller center rosses the outer peripheral surface of the supplying roller.
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公开(公告)号：US20190094787A1
公开(公告)日：2019-03-28
申请号：US15956756
申请日：2018-04-19
Applicant: FUJI XEROX CO., LTD.
Inventor： Shintaro ANNO , Hiroaki SAIJO , Takuro WATANABE , Yasuaki HASHIMOTO , Fusako KIYONO
CPC classification number: G03G21/0047 , G03G9/08795 , G03G9/08797 , G03G9/0902 , G03G9/0926 , G03G9/10 , G03G9/107 , G03G9/1131 , G03G9/1133 , G03G15/6585 , G03G21/0011
Abstract: An image forming apparatus includes: a first image forming unit that includes a first image holding member and a first developing unit, the first developing unit accommodating a first developer that includes a first toner and a first carrier; a first transfer unit; a second image forming unit that is disposed downstream of the first image forming unit in a traveling direction of the transfer medium and includes a second image holding member and a second developing unit, the second developing unit accommodating a second developer that includes a second toner and a second carrier; and a second transfer unit, in which a volume resistivity of the first carrier is lower than a volume resistivity of the second carrier, and a volume average particle diameter of the first carrier is less than a volume average particle diameter of the second carrier.
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公开(公告)号：US20180329327A1
公开(公告)日：2018-11-15
申请号：US15975305
申请日：2018-05-09
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kentaro Yamawaki , Akane Masumoto , Tomonori Matsunaga , Kunihiko Nakamura , Sara Yoshida , Shinsuke Mochizuki , Tsuneyoshi Tominaga , Kenta Kamikura , Tsutomu Shimano , Toshihiko Katakura , Shiro Kuroki
CPC classification number: G03G9/09328 , G03G9/08 , G03G9/0819 , G03G9/0821 , G03G9/0825 , G03G9/0833 , G03G9/08711 , G03G9/08755 , G03G9/08773 , G03G9/09342 , G03G9/09364 , G03G9/09371 , G03G9/09392 , G03G9/09708 , G03G9/09783 , G03G9/107 , G03G9/1136
Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10−4 N, of from 200 MPa to 1,100 MPa.
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公开(公告)号：US20180329320A1
公开(公告)日：2018-11-15
申请号：US15974187
申请日：2018-05-08
Applicant: CANON KABUSHIKI KAISHA
Inventor： SARA YOSHIDA , Shinsuke Mochizuki , Tsuneyoshi Tominaga , Kenta Kamikura , Tsutomu Shimano , Kentaro Yamawaki , Akane Masumoto , Tomonori Matsunaga , Kunihiko Nakamura , Toshihiko Katakura , Shiro Kuroki
CPC classification number: G03G9/09328 , G03G9/08 , G03G9/0819 , G03G9/0821 , G03G9/0825 , G03G9/0833 , G03G9/08711 , G03G9/08755 , G03G9/08773 , G03G9/09307 , G03G9/09342 , G03G9/09364 , G03G9/09371 , G03G9/09392 , G03G9/09708 , G03G9/09783 , G03G9/107 , G03G9/1136
Abstract: A toner comprising a toner particle that contains a binder resin and a release agent, wherein the toner particle has a surface layer that contains an organosilicon polymer and the luminance histogram of a backscattered electron image of the toner particle has two peak values P1 and P2 and a minimum value V between P1 and P2, P2 originates from the organosilicon polymer, and the luminance giving P1 and P2 are in specific ranges, percentages for P1 and P2 are each at least 0.50%, and using the luminance Bl at V as a reference point, specific relationships are satisfied by A1, AV, and A2, where A1 is the total number of pixels at luminance from 0 to (Bl−30), AV is the total number of pixels at luminance from (Bl−29) to (Bl+29), and A2 is the total number of pixels at luminance from (Bl+30) to 255.
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Patent Agency Ranking
6.发明授权公开(公告)号：US10007206B2
公开(公告)日：2018-06-26
申请号：US15426628
申请日：2017-02-07
Applicant: CANON KABUSHIKI KAISHA
Inventor： Nobuyoshi Sugahara , Hironori Minagawa , Wakashi Iida , Atsushi Nakano
CPC classification number: G03G9/1133 , G03G9/08755 , G03G9/107 , G03G9/1075 , G03G15/0887
Abstract: A magnetic carrier having a ferrite-type core material and a resin coat layer present on the surface of the ferrite-type core material, wherein the ferrite-type core material contains a magnetic ferrite-type core material particle and an amino group-bearing primer compound; the resin coat layer contains a coating resin A that is a polymer of monomer containing a (meth)acrylate ester having an alicyclic hydrocarbon group; the content of the amino group-bearing primer compound in the ferrite-type core material and the content of the resin coat layer in the magnetic carrier are within the prescribed range.
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公开(公告)号：US09921510B2
公开(公告)日：2018-03-20
申请号：US15434300
申请日：2017-02-16
Applicant: TODA KOGYO CORPORATION
Inventor： Katsuji Iwami , Shigenori Harada , Eiichi Kurita , Kaori Kinoshita
CPC classification number: G03G9/1075 , G03G9/0819 , G03G9/0827 , G03G9/08755 , G03G9/0918 , G03G9/107 , G03G9/1131 , G03G9/1133 , G03G9/1134 , G03G9/1135 , G03G9/1136
Abstract: The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical magnetic composite particles comprising a phenol resin as a binder and ferromagnetic iron oxide particles bonded to each other through the phenol resin, wherein the spherical magnetic composite particles have a ten-point mean roughness Rz of 0.3 to 2.0 μm. The magnetic carrier for an electrophotographic developer according to the present invention exhibits an excellent durability against peeling-off and abrasion of coating resins formed thereon and a high stability to mechanical stress exerted onto the carrier, is free from occurrence of spent toner, can be stably held over a long period of time without occurrence of fogging and unevenness in density of toner images, and can keep high-quality images with an excellent gradation for a long period of time.
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公开(公告)号：US20180074426A1
公开(公告)日：2018-03-15
申请号：US15696698
申请日：2017-09-06
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Hajime AKIBA , Tetsuya UEMURA
CPC classification number: G03G9/1133 , G03G9/10 , G03G9/107 , G03G9/1075 , G03G9/1131 , G03G9/1132 , G03G9/1136
Abstract: An object of the present invention is to provide a carrier low in specific gravity and less in both environmental fluctuation and change of the charge amount after aging, an electrophotographic developer using the carrier, and a method of manufacturing the carrier. To achieve the object, the carrier is manufactured by coating a core material composed of a magnetic component and a non-magnetic component with a resin, and the carrier is characterized in that water content is 200 ppm or less and cyclic siloxane content is 100 ppb or less. Further, an electrophotographic developer containing the carrier is provided.
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公开(公告)号：US20180052405A1
公开(公告)日：2018-02-22
申请号：US15553623
申请日：2016-03-01
Inventor： Yohei ISHIKAWA , Shinya SASAKI
CPC classification number: G03G9/0827 , G03G9/0819 , G03G9/107 , G03G9/1075 , G03G9/113 , G03G9/1131 , G03G9/1132
Abstract: A carrier core material is represented by a composition formula MxFe3-xO4 (where M is Mn and/or Mg, and X is a total of Mn and Mg and is a substitution number of Fe by Mn and Mg, 0
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公开(公告)号：US20180024455A1
公开(公告)日：2018-01-25
申请号：US15656018
申请日：2017-07-21
Inventor： Yuto KAMAI , Shinya SASAKI
CPC classification number: G03G9/107 , G03G9/1075 , G03G9/1131 , G03G9/1132 , G03G9/1138
Abstract: A carrier core material is provided that is formed with ferrite particles which can uniformly adhere a coupling agent to the entire surface. A carrier core material is formed with ferrite particles, and the powder pH of the ferrite particles is equal to or more than 9. Here, the ferrite particles are preferably formed of Mn ferrite or Mn—Mg ferrite. The ferrite particles preferably contain 45 wt % or more but 65 wt % or less of Fe, 15 wt % or more but 30 wt % or less of Mn and 5 wt % or less of Mg.
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