公开(公告)号：US12164265B2

公开(公告)日：2024-12-10

申请号：US17585315

申请日：2022-01-26

Applicant: CANON KABUSHIKI KAISHA

Inventor： Yuto Onozaki ,  Ryuji Murayama ,  Nobuhiro Yoshida ,  Hironori Minagawa

IPC: G03G9/107 ,  G03G9/087 ,  G03G9/09 ,  G03G9/113 ,  G03G9/13 ,  G03G15/09 ,  B82Y40/00

Abstract: A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.

公开(公告)号：US12140881B2

公开(公告)日：2024-11-12

申请号：US18348829

申请日：2023-07-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Seiji Kikushima

IPC: G03G15/08 ,  G03G9/087 ,  G03G15/00 ,  G03G15/09 ,  G03G21/00

Abstract: A developing device includes a developing device case, a developer carrier, a regulating blade, a magnet member, and a blade magnet. The regulating blade forms a regulating part. Toner contains toner mother particles containing binder resin and magnetic powder, and silica particles and alumina particles adhered to surfaces of the toner mother particles. The alumina particles has a primary particle size of 150 nm or more and 400 nm or less, and resistivity of 0.1 Ωm or more and 2 Ωm or less. The developing device can execute a developer removal mode in which the developer carrier is rotated in a reverse direction opposite to a forward direction that is a rotation direction at image forming time, in a range of 1/18 or more and ⅕ or less of an outer circumference length of the developer carrier, so as to remove the developer staying at the regulating part.

公开(公告)号：US12135506B2

公开(公告)日：2024-11-05

申请号：US18174456

申请日：2023-02-24

Applicant: Toshiba Tec Kabushiki Kaisha

Inventor： Suguru Kurita

IPC: G03G15/02 ,  G03G15/00 ,  G03G15/01 ,  G03G15/043 ,  G03G15/09 ,  G03G21/16 ,  G03G21/18

Abstract: An image forming device includes a communication device, an image forming unit, a transfer unit, a transmitting unit, and a processor. The communication device communicates includes a wireless tag. The image forming unit forms a developer image on a surface of a photoreceptor. The transfer unit transfers the developer image to a medium provided with the wireless tag communicating with the communication device. The transmitting unit transmits the medium to the transfer unit. The processor controls an operation of the transmitting unit so as to transmit the medium at a first timing when communication with the wireless tag by the communication device is normally executed and controls the operation of the transmitting unit so as to transmit the medium at a second timing different from the first timing when the communication with the wireless tag by the communication device is not normally ended.

公开(公告)号：US20240353777A1

公开(公告)日：2024-10-24

申请号：US18625919

申请日：2024-04-03

Applicant: Konica Minolta, Inc.

Inventor： Michiaki ISHIKAWA ,  Akihiko ITAMI ,  Aya SHIRAI

IPC: G03G15/09 ,  G03G15/08 ,  G03G21/18

CPC classification number: G03G15/0928 ,  G03G15/0808 ,  G03G15/0818 ,  G03G21/1814 ,  G03G2215/0604

Abstract: A developing roller for an electrophotographic image forming apparatus, which conveys a developer, wherein the developing roller includes a developing sleeve and a member that generates a magnetic flux inside the developing sleeve, and the developing sleeve contains an aluminum alloy containing more than 0.6% by mass of silicon.

公开(公告)号：US12066771B2

公开(公告)日：2024-08-20

申请号：US17376300

申请日：2021-07-15

Applicant: CANON KABUSHIKI KAISHA

Inventor： Masashi Wakisaka

IPC: G03G15/08 ,  G03G15/09 ,  G03G21/20

CPC classification number: G03G15/0891 ,  G03G15/0882 ,  G03G15/0893 ,  G03G15/09 ,  G03G21/206 ,  G03G2215/0609 ,  G03G2215/0687 ,  G03G2215/0819 ,  G03G2215/0827 ,  G03G2215/0838

Abstract: A developing apparatus includes a developing container to accommodate a developer and having first and second chambers divided by a partition wall for supplying the developer to a rotatable developing member and first and second communicating portions to allow the developer to move between first and second chambers by conveyance screws. A third communicating portion is disposed between the first and second communicating portions and above the conveyance screws to allow air inside the developing container to move between the first chamber and the second chamber. The developing container further includes a third chamber disposed above the second chamber in the vertical direction and accommodates initial developer in an unused state of the developing apparatus, and an opening portion for discharging the air inside the developing container to outside of the developing container is provided in the third chamber, with the opening being disposed above the third chamber.

公开(公告)号：US12001156B2

公开(公告)日：2024-06-04

申请号：US18023977

申请日：2020-12-15

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Seungchan Park ,  Jungho Roh ,  Myeongdong Kim ,  Donguk Kim ,  Youngkwang Shin

IPC: G03G15/09 ,  G03G15/08

CPC classification number: G03G15/0928 ,  G03G15/0818

Abstract: In some examples, a developing device includes a developing container including an opening and to store a developer, a developing sleeve installed in the developing container and partially exposed to an outside of the developing container through the opening, a regulation member upstream of the opening in a rotation direction of the developing sleeve and to regulate an amount of the developer adhered to the developing sleeve and supplied to the opening, and a magnetic member inside the developing sleeve. The magnetic member includes a main pole facing the opening, a regulation pole facing the regulation member, and a catch pole upstream of the regulation pole in the rotation direction of the developing sleeve. The magnetic member is to cause adhesion of the developer in the developing container to the developing sleeve. At least one of lengths of the catch pole or the regulation pole and diameters of both end portions of the catch pole or the regulation pole are less than a length and a diameter, respectively, of the main pole.

公开(公告)号：US11982954B2

公开(公告)日：2024-05-14

申请号：US17826401

申请日：2022-05-27

Applicant: CANON KABUSHIKI KAISHA

Inventor： Takahiro Suzuki ,  Tomoyuki Sakamaki

IPC: G03G15/09

CPC classification number: G03G15/0921

Abstract: With respect to a rotational direction of a rotatable developing member of a developing device, an opposing position where a regulating portion of the developing device is opposed to an outer peripheral surface of the rotatable developing member is between a first maximum position and a position where a magnetic flux density of a regulating pole in a tangential direction relative to the outer peripheral surface of the rotatable developing member is zero. With respect to the rotational direction of the rotatable developing member, the position where the magnetic flux density of the regulating pole in the tangential direction relative to the outer peripheral surface of the rotatable developing member is zero is within a range of ±2° of a midpoint between the first maximum position and a second maximum position or is downstream of the range.

公开(公告)号：US20240142897A1

公开(公告)日：2024-05-02

申请号：US18497980

申请日：2023-10-30

Applicant: KYOCERA Document Solutions Inc.

Inventor： Takeshi ARAKAWA

IPC: G03G15/09 ,  G03G9/08 ,  G03G9/107

CPC classification number: G03G15/0921 ,  G03G9/0815 ,  G03G9/1087

Abstract: A development device includes an accommodation section that accommodates a developer and a developer bearing member that carries the developer in the accommodation section. The developer bearing member includes a magnetic member and a sleeve provided around the magnetic member rotatably around the magnetic member. The sleeve includes a metal substrate with a surface having projections and recesses and a plating layer covering the surface of the metal substrate. The plating layer contains chromium and cobalt. The developer contains a toner and the toner includes toner particles. The toner particles each include a toner mother particle and external additive particles attached to the surface of the toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The external additive particles include alumina particles with surfaces that are hydrophobized.

公开(公告)号：US20240069470A1

公开(公告)日：2024-02-29

申请号：US18388309

申请日：2023-11-09

Applicant: CANON KABUSHIKI KAISHA

Inventor： Chihiro Tanaka

IPC: G03G15/09 ,  G03G15/01 ,  G03G15/08 ,  G03G15/095

CPC classification number: G03G15/0921 ,  G03G15/0121 ,  G03G15/0808 ,  G03G15/0812 ,  G03G15/0818 ,  G03G15/09 ,  G03G15/0928 ,  G03G15/095

Abstract: A developing device includes a developing container, a developing roller, a supplying roller, a first magnet including a first magnetic pole, a second magnet including second to fifth magnetic poles, and a regulating member. A maximum magnetic flux density of the second magnetic pole is larger in absolute value than a maximum magnetic flux density of the third magnetic pole in a normal direction to the supplying roller, and a maximum magnetic flux density of the third magnetic pole is larger in absolute value than a maximum magnetic flux density of the fourth magnetic pole in the normal direction. With respect to a rotational direction of the supplying roller, an angle between maximum magnetic flux density positions of the second and third magnetic poles is smaller than an angle between maximum magnetic flux density positions of the third and fourth magnetic poles.

公开(公告)号：US11874615B2

公开(公告)日：2024-01-16

申请号：US17859669

申请日：2022-07-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akihiro Watanabe ,  Ryo Yamada ,  Uto Syu ,  Yuji Toyota ,  Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0891 ,  G03G15/081 ,  G03G15/0921 ,  G03G2215/0609

Abstract: A developing device includes a developing container, a first stirring conveyance member, a second stirring conveyance member, a developer carrying member including a developing sleeve and a magnet, and a regulation member. The regulation pole in the magnet has a region extending over 10° or more in which a maximum value of a vertical magnetic force is not more than 65 [mT] and a vertical magnetic force gradient is not more than 0.3 [mT/°]. A peak position of the vertical magnetic force gradient of the regulation pole is arranged at a position opposed to the second stirring conveyance member, and when a value of the vertical magnetic force gradient and a value of the vertical magnetic force at the peak position of the vertical magnetic force gradient are indicated as A [mT/°] and K [mT], respectively, A≥2.8 and A×K≥62.5 are satisfied.