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公开(公告)号：US20250110417A1
公开(公告)日：2025-04-03
申请号：US18893376
申请日：2024-09-23
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Akira MATAYOSHI , Norio KUBO , Asami SASAKI , Kazuaki FUJIWARA , Einosuke KIKUCHI
Abstract: An image forming apparatus includes a two-component developer, a photosensitive member, a charging device, a development device and an intermediate transfer belt. The intermediate transfer belt contains a base resin and a conductive agent. The base resin includes a thermoplastic resin or a thermosetting resin. The photosensitive member includes a base member and an amorphous silicon photosensitive layer. The arithmetic average roughness Ra of the surface of the photosensitive member is equal to or greater than 37 nm but equal to or less than 105 nm. The toner particle includes a toner base particle and a toner external additive that is adhered to the surface of the toner base particle. The toner external additive includes a spacer particle. The number average primary particle diameter of the spacer particle is greater than the arithmetic average roughness Ra of the surface of the photosensitive member.
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公开(公告)号：US20210173330A1
公开(公告)日：2021-06-10
申请号：US17113063
申请日：2020-12-06
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuji TOYOTA , Yasuhiro TAUCHI , Masashi FUJISHIMA , Norio KUBO , Akira MATAYOSHI
Abstract: Provided is an image forming apparatus capable of suppressing the occurrence of image defects in response to a difference in carrier resistance and obtaining high image quality. A developing unit has a developing roller that carries the toner in a two-component developer that includes a toner and a magnetic carrier on the surface thereof, and forms a toner image on the surface of a photosensitive drum. A current detecting unit detects developing current flowing between the developing roller and the photosensitive drum when a developing voltage is applied to the developing roller by a developing power supply. When the developing voltage is applied to the photosensitive drum, the control unit derives a carrier resistance based on the developing current detected by a current detecting unit, and controls the AC amplitude of the AC voltage of the development voltage is based on the carrier resistance.
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公开(公告)号：US20240077810A1
公开(公告)日：2024-03-07
申请号：US18458713
申请日：2023-08-30
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kohei TERASAKI , Akira MATAYOSHI , Yuji TOYOTA
CPC classification number: G03G9/08773 , G03G9/10 , G03G15/0865
Abstract: A developer includes a toner containing toner particles and a carrier containing carrier particles. The toner particles each include a toner mother particle and external additive particles attached to a surface of the toner mother particle. The external additive particles include first silica particles and spacer particles. The first silica particles have a number average primary particle diameter of at least 10 nm and no greater than 30 nm. The spacer particles have a number average primary particle diameter of at least 32 nm and no greater than 145 nm. The spacer particles in the toner particles have a coverage ratio of at least 2.0% by area and no greater than 40.0% by area. The carrier particles each include a carrier mother particle and strontium titanate particles attached to a surface of the carrier mother particle.
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公开(公告)号：US20240069456A1
公开(公告)日：2024-02-29
申请号：US18458982
申请日：2023-08-30
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kohei TERASAKI , Norio KUBO , Yuji TOYOTA , Akira MATAYOSHI
CPC classification number: G03G9/0833 , G03G9/0904 , G03G9/1139 , G03G15/0867
Abstract: Toner particles in a developer include first strontium titanate particles attached to the surface of each toner mother particle thereof. The first strontium titanate particles have a content ratio of 0.3 to 0.9 parts by mass to 100.0 parts by mass of the toner mother particles. In the developer, coat layers of carrier mother particles of first carrier particles contain barium titanate particles and a coating resin including silicone resin. The barium titanate particles have a content ratio of 2 to 47 parts by mass to 100 parts by mass of the coating resin. Second strontium titanate particles attached to the surfaces of the carrier mother particles have a diameter of 15 to 85 nm.
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公开(公告)号：US20200285186A1
公开(公告)日：2020-09-10
申请号：US16809369
申请日：2020-03-04
Applicant: KYOCERA Document Solutions Inc.
Inventor： Masaru WATANABE , Akira MATAYOSHI
Abstract: An image forming apparatus includes a developing section, storage, a first calculation section, a comparing section, and an executing section. The developing section develops an electrostatic latent image with toner. The storage stores coverage rates. The first calculation section calculates a first coverage rate and a second coverage rate. The comparing section compares the first coverage rate with the second coverage rate. The first coverage rate includes one or more coverage rates stored earlier in the storage than the second coverage rate. The second coverage rate includes coverage rates of a specified number of latest images individually formed on the specified number of sheets. The running-in operation is driving the developing section. The executing section executes the running-in operation.
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Patent Agency Ranking
公开(公告)号：US20220057727A1
公开(公告)日：2022-02-24
申请号：US17403148
申请日：2021-08-16
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Masashi FUJISHIMA , Akira MATAYOSHI , Yasuhiro TAUCHI , Yuji TOYOTA , Norio KUBO
Abstract: An image forming apparatus includes an image carrier, a charging device, an exposure device, a development device, a transferring part, a development bias applying part, an electric current detection part, a density detection part and a bias condition determination part. The bias condition determination part performs a DC voltage determination mode (a DC calibration) determining a reference DC voltage serving as a reference of a DC voltage of a development bias applied to a development roller and a peak-to-peak voltage determination mode (an AC calibration) determining a reference peak-to-peak voltage serving as a reference of a peak-to-peak voltage of an AC voltage of the development bias. When a difference between the reference DC voltages determined the successive DC voltage determination modes exceeds a predetermined threshold value, the bias condition determination part performs the peak-to-peak determination mode.
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公开(公告)号：US20210255566A1
公开(公告)日：2021-08-19
申请号：US17171357
申请日：2021-02-09
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Yasuhiro TAUCHI , Akira MATAYOSHI , Masashi FUJISHIMA
Abstract: A bias condition determination portion of an image forming device executes each of: a first approximation expression determination operation that respectively acquires the DC component of the development current with at least three peak-to-peak voltages included in a first measurement range and determines a first expression showing a relation between the peak-to-peak voltage and the DC component of the acquired development current, a second approximation expression determination operation that respectively acquires the DC component of the development current with at least three peak-to-peak voltages included in a second measurement range larger than the first measurement range and determines a second approximation expression showing a relation between the peak-to-peak voltage and the DC component of the acquired development current, and a reference voltage determination operation that determines, as a reference peak-to-peak voltage, the peak-to-peak voltage at an intersection where the first approximation expression and the second approximation expression intersect each other.
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公开(公告)号：US20210364951A1
公开(公告)日：2021-11-25
申请号：US17322198
申请日：2021-05-17
Applicant: KYOCERA Document Solutions Inc.
Inventor： Asami SASAKI , Akira MATAYOSHI , Norio KUBO , Koji SUENAMI , Yuji TOYOTA , Tamotsu SHIMIZU , Masashi FUJISHIMA , Yasuhiro TAUCHI
IPC: G03G15/08
Abstract: A developing device includes a developer container, a developer carrier, and first and second members for stirring/conveying. The developer container includes a first partition wall between first and second chambers, a communication portion through which those chambers communicate at opposite ends of the first partition wall, a developer supply port, and a developer discharge portion. The first member stirs and conveys developer in the first chamber in a first direction. The second member stirs and conveys developer in the second chamber in a second direction and includes a regulating portion and a discharging blade. The developer container includes a second partition wall between the first chamber and the regulating portion. The gap from the upper end of the second partition wall to the inner surface of the developer container is larger than the gap thereto from the upper ends of a first helical blade and the regulating portion.
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公开(公告)号：US20210364944A1
公开(公告)日：2021-11-25
申请号：US17322298
申请日：2021-05-17
Applicant: KYOCERA Document Solutions Inc.
Inventor： Masashi FUJISHIMA , Norio KUBO , Asami SASAKI , Yasuhiro TAUCHI , Tamotsu SHIMIZU , Akira MATAYOSHI , Masaki KADOTA , Koji SUENAMI , Yuji TOYOTA
IPC: G03G15/08
Abstract: A developing device includes a developer container, a developer carrier, and first and second stirring/conveying members. The developer container includes a first partition wall partitioning between the two conveying chambers longitudinally, a first communication portion for passing developer from the first to the second conveying chamber, a second communication portion for passing developer from the second to the first conveying chamber, a developer supply port for supplying developer in, a developer discharge portion for discharging excessive developer, a second partition wall arranged, adjacent to the regulating portion, downstream of the second communication portion to partition between the first conveying chamber and the regulating portion, and a shield portion connected to the two partition walls to bridge between them to shield a top part of the second communication portion. A gap is formed between an upper end part of the shield portion and the inner surface of the developer container.
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公开(公告)号：US20200285185A1
公开(公告)日：2020-09-10
申请号：US16809357
申请日：2020-03-04
Applicant: KYOCERA Document Solutions Inc.
Inventor： Masaru WATANABE , Akira MATAYOSHI
Abstract: An image forming apparatus includes a developing section, storage, a first calculation section, a comparing section, and an executing section. The developing section contains toner and develops an electrostatic latent image with the toner. The storage stores coverage rates. The first calculation section calculates a first coverage rate and a second coverage rate. The comparing section compares the first coverage rate with the second coverage rate. The executing section executes a running-in operation based on a result of comparison by the comparing section. The first coverage rate includes one or more coverage rates stored earlier in the storage than the second coverage rate. The second coverage rate includes coverage rates of a specified number of latest images individually formed on the specified number of sheets. The running-in operation is driving the developing section.
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