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11.发明申请公开(公告)号：US20220128925A1
公开(公告)日：2022-04-28
申请号：US17507024
申请日：2021-10-21
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kazunori TANAKA , Yoshihiro YAMAGISHI , Tamotsu SHIMIZU
Abstract: An image forming apparatus includes a developing device that forms a toner image, by developing an electrostatic latent image formed on a photoconductor drum, a charging device that electrically charges the photoconductor drum, a developing power source that applies a predetermined developing bias voltage to the developing device, and a calculation device that calculates a surface potential of the photoconductor drum, on a basis of the developing current flowing in the developing device. The developing power source applies the developing bias voltage in a plurality of levels, to the developing device. A current measurement device measures a developing current, with respect to the developing bias voltage of each level. The calculation device calculates the surface potential, on the basis of each developing current.
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公开(公告)号：US20220091531A1
公开(公告)日：2022-03-24
申请号：US17474508
申请日：2021-09-14
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yoshihiro YAMAGISHI , Tamotsu SHIMIZU , Kazunori TANAKA
Abstract: An image forming apparatus includes an image carrier, a charging device, a developing device, a transfer device, a development power supply, a current measurement device, and a processor. The development power supply applies a predetermined bias voltage to the developing device. The processor functions as a calculator and a controller. The calculator calculates a surface potential of the image carrier based on the development current measured by the current measurement device. The controller controls the charging device, the developing device, the transfer device, and the development power supply. The controller sets a tentative transfer current to be flowed through the transfer device while the calculator calculates the surface potential.
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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：US20210302869A1
公开(公告)日：2021-09-30
申请号：US17210390
申请日：2021-03-23
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kazunori TANAKA , Yoshihiro YAMAGISHI , Tamotsu SHIMIZU
Abstract: An image forming apparatus includes: a development device which develops an electrostatic latent image formed on a photosensitive drum into a toner image; a charger which charges the photosensitive drum; a development power supply which applies a bias voltage to the development device; a calculating section which calculates a surface potential of the photosensitive drum based on a development current flowing in the development device; and an estimating section which estimates a fogging toner amount. The fogging toner amount is an amount of toner moved due to fogging. When the fogging toner amount estimated by the estimating section is less than a prescribed threshold, the calculating section calculates a value of the bias voltage at which the development current stops flowing as the surface potential.
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公开(公告)号：US20210302868A1
公开(公告)日：2021-09-30
申请号：US17210345
申请日：2021-03-23
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kazunori TANAKA , Yoshihiro YAMAGISHI , Tamotsu SHIMIZU
IPC: G03G15/06
Abstract: An image forming apparatus includes: a development device which develops an electrostatic latent image formed on a photosensitive drum into a toner image; a charger which charges the photosensitive drum; a development power supply which applies a bias voltage to the development device; an electric current measuring section which measures a development current flowing in the development device; and a calculating section which calculates a surface potential of the photosensitive drum based on the development current. The charger applies charging biases to the photosensitive drum. The electric current measuring section measures a corresponding value of the development current for each development bias voltage applied to the development device. The calculating section calculates, per charging bias, a development bias voltage at which the development current stops flowing as the surface potential, and calculates a correspondence between the surface potential and the charging bias based on calculated values of the surface potential.
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Patent Agency Ranking
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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17.发明申请公开(公告)号：US20220004116A1
公开(公告)日：2022-01-06
申请号：US17362948
申请日：2021-06-29
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yoshihiro YAMAGISHI , Tamotsu SHIMIZU , Kazunori TANAKA
Abstract: An image forming apparatus includes an image carrier, a charging device, a developing device, a developing power source, a current measuring device, and a processor. On a surface of the image carrier, an electrostatic latent image is formed. The charging device electrically charges the image carrier. The developing device forms a toner image, by supplying toner to the image carrier and developing the electrostatic latent image formed on the image carrier. The developing power source applies a predetermined bias voltage to the developing device. The current measuring device measures a developing current flowing in the developing device. The processor acts, by executing a control program, as a calculator that calculates a surface potential of the image carrier, on a basis of the developing current measured by the measuring device.
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公开(公告)号：US20210302866A1
公开(公告)日：2021-09-30
申请号：US17206248
申请日：2021-03-19
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Norio KUBO , Asami SASAKI , Yasuhiro TAUCHI , Yuji TOYOTA
IPC: G03G15/06
Abstract: A bias condition determiner executes a direct current voltage determination mode (DC calibration) for determining a reference direct current voltage that is a reference for a direct current voltage of a developing bias applied to a developing roller in an image forming operation and an inter-peak voltage determination mode (AC calibration) for determining a reference inter-peak voltage that is a reference for an inter-peak voltage of an alternating current voltage of the developing bias applied to the developing roller in the image forming operation. A calibration executor determines whether the inter-peak voltage determination mode needs to be executed in accordance with a value of the reference direct current voltage.
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公开(公告)号：US20210263442A1
公开(公告)日：2021-08-26
申请号：US17178577
申请日：2021-02-18
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kazunori TANAKA , Kanako MORIMOTO , Shiro KANEKO
Abstract: An image forming apparatus includes a plurality of image forming units, a developing voltage power supply, a current detection unit, and a control unit. The image forming units form an image by superimposing a toner image of a same color and a same type, and substantially same development conditions are set to evenly divide an image density among the image forming units. The control unit detects whether there is an anomaly in the image forming unit based on detecting a DC component of developing current, being either of current flowing through a non-exposed portion of an image carrier during image formation, and current flowing through an exposed portion of the image carrier. When an anomaly is detected in any image forming unit, the control unit inhibits use of the image forming unit, and resets the development conditions to evenly divide an image density among the usable image forming units.
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公开(公告)号：US20210263441A1
公开(公告)日：2021-08-26
申请号：US17178548
申请日：2021-02-18
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kanako Morimoto , Kazunori Tanaka , Kenichi Tamaki
Abstract: An image forming apparatus includes a plurality of image forming units, a developing voltage power supply, a density detection device, a current detection unit, and a control unit. The plurality of image forming units form an image and substantially same development conditions are set to evenly divide an image density among the image forming units. The control unit detects whether there is an anomaly in a developing device, based on a toner charge amount calculated based on a DC component of developing current when a reference image is formed on an image carrier by each of the developing devices and a density of the reference image. When an anomaly is detected in any of the developing devices, the control unit inhibits use of the image forming unit including the developing device, and resets the development conditions to evenly divide the image density among the usable image forming units.
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