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公开(公告)号：US11982954B2
公开(公告)日：2024-05-14
申请号：US17826401
申请日：2022-05-27
发明人： Takahiro Suzuki , Tomoyuki Sakamaki
IPC分类号： G03G15/09
CPC分类号： G03G15/0921
摘要： 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.
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公开(公告)号：US20240142897A1
公开(公告)日：2024-05-02
申请号：US18497980
申请日：2023-10-30
发明人： Takeshi ARAKAWA
CPC分类号： G03G15/0921 , G03G9/0815 , G03G9/1087
摘要： 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.
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公开(公告)号：US20240069470A1
公开(公告)日：2024-02-29
申请号：US18388309
申请日：2023-11-09
发明人： Chihiro Tanaka
IPC分类号： G03G15/09 , G03G15/01 , G03G15/08 , G03G15/095
CPC分类号： G03G15/0921 , G03G15/0121 , G03G15/0808 , G03G15/0812 , G03G15/0818 , G03G15/09 , G03G15/0928 , G03G15/095
摘要： 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.
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公开(公告)号：US11874615B2
公开(公告)日：2024-01-16
申请号：US17859669
申请日：2022-07-07
发明人： Tamotsu Shimizu , Akihiro Watanabe , Ryo Yamada , Uto Syu , Yuji Toyota , Yasuhiro Tauchi
CPC分类号： G03G15/0891 , G03G15/081 , G03G15/0921 , G03G2215/0609
摘要： 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.
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公开(公告)号：US20230244159A1
公开(公告)日：2023-08-03
申请号：US18299745
申请日：2023-04-13
发明人： Junichi HASHIMOTO , Yuwen WANG , Takuya AMAIKE , Soun KANADA , Kazuma HINOUE
CPC分类号： G03G15/0891 , G03G15/0921
摘要： An image forming apparatus including a housing, a toner cartridge, and a drum unit. The drum unit is movable through the opening between an accommodated position where the drum unit is positioned in the housing and a pulled-out position where the drum unit is pulled out of the housing. The drum unit includes a photosensitive drum and a developing unit. The photosensitive drum is rotatable about a first axis extending in a second direction. The developing unit includes a magnetic roller, a developer container, a first auger and a second auger. The magnetic roller is positioned between the toner cartridge and the photosensitive drum. The magnetic roller faces a surface of the photosensitive drum. The developer container is formed with an inlet allowing the toner to be replenished from the toner cartridge. The first auger is positioned in the developer container. The second auger is positioned in the developer container.
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公开(公告)号：US20190187589A1
公开(公告)日：2019-06-20
申请号：US16183166
申请日：2018-11-07
申请人： Konica Minolta, Inc.
IPC分类号： G03G15/09
CPC分类号： G03G15/0921
摘要： A magnet roller includes a magnet portion for generating magnetic force such that a plurality of peaks are formed in a magnetic force distribution. The magnet portion includes a plurality of magnetic poles. A cross section of the magnet portion includes a portion in which a distance from an axial center of the magnet portion to an outer edge of the magnet portion continuously changes in the circumferential direction. The magnetic force on a surface of a developing sleeve at a position corresponding to each of the plurality of magnetic poles is determined by (i) a distance from each of the plurality of magnetic poles to the developing sleeve in a radial direction of the developing sleeve and (ii) a magnitude of magnetic force in each of the plurality of magnetic poles. The distances from the plurality of magnetic poles to the developing sleeve in the radial direction are different.
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公开(公告)号：US20180321612A1
公开(公告)日：2018-11-08
申请号：US15951749
申请日：2018-04-12
发明人： Tomoyuki Sakamaki
CPC分类号： G03G15/0808 , G03G5/102 , G03G5/147 , G03G15/0121 , G03G15/0818 , G03G15/0921 , G03G15/50 , G03G15/5008 , G03G15/75 , G03G21/0011 , G03G2215/00962 , G03G2215/0404 , G03G2215/0607 , G03G2215/0636
摘要： An image forming apparatus includes a rotatable image bearing member and a rotatable developer bearing member. The image bearing member, configured to carry a toner image, includes first recess portions provided at intervals substantially equal to a first pitch Pdr (mm) in a rotation direction of the image bearing member. The developer bearing member, configured to carry developer comprising toner and carrier and to form the toner image on the image bearing member, includes second recess portions provided at intervals substantially equal to a second pitch Ps (mm) in a rotation direction of the developer bearing member. The following relationship is satisfied Vs/Vdr
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公开(公告)号：US20180267433A1
公开(公告)日：2018-09-20
申请号：US15913555
申请日：2018-03-06
发明人： Ryohei Terada
IPC分类号： G03G15/09
CPC分类号： G03G15/0896 , G03G15/065 , G03G15/0921 , G03G2215/0651
摘要： A development device includes a power source capable of applying a second voltage higher than a first voltage to be applied to a developer bearing member, a scattering prevention electrode that is arranged opposite the developer bearing member and to which the second voltage is applied from the power source, and a step-down circuit. The step-down circuit steps down a voltage from the power source from the second voltage to the first voltage to apply the stepped-down voltage to the developer bearing member.
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公开(公告)号：US20180181052A1
公开(公告)日：2018-06-28
申请号：US15842741
申请日：2017-12-14
发明人： Hiroyuki Hamakawa
CPC分类号： G03G21/0064 , G03G15/0808 , G03G15/0812 , G03G15/0921 , G03G21/0011 , G03G21/10
摘要： An image forming apparatus includes a developer storage portion, a developing roller, a magnetic force generating portion, and an image carrying member. The magnetic force generating portion is provided in the developing roller and generates a magnetic force for keeping the developer on an outer circumferential surface of the developing roller. The image carrying member is disposed to face the developing roller across a predetermined developing gap, is rotationally driven, receives the toner from the developer supplied to the developing gap by the developing roller, and keeps a toner image on an outer circumferential surface of the image carrying member. The image forming apparatus, during non image formation, supplies a more amount of developer to the developing gap than an amount of developer for developing supplied to the developing gap during image formation such that the outer circumferential surface of the image carrying member is cleaned.
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10.发明申请公开(公告)号：US20180181029A1
公开(公告)日：2018-06-28
申请号：US15901980
申请日：2018-02-22
发明人： Nobuaki TAKAHASHI
CPC分类号： G03G15/0928 , G03G15/0921 , G03G21/206
摘要： A developing method in a developer device having a developing roller configured to rotate within a housing, the developing roller having a first portion that is exposed through an opening of the housing, a second portion at which developer attached to the developing roller separates from the developing roller and a third portion between the first and second portions, and an elastic sheet in contact with the developing roller between the second and third portions of the developing roller, the method includes guiding airflow along a first airflow passage, which is formed in the housing and partially facing the second portion of the developing roller, and guiding airflow along a second airflow passage facing the third portion of the developing roller and adjacent to the first airflow passage.
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