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公开(公告)号：US11914312B2
公开(公告)日：2024-02-27
申请号：US17858537
申请日：2022-07-06
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu Shimizu , Yuji Toyota , Yasuhiro Tauchi
CPC classification number: G03G15/0928 , G03G9/1136 , G03G9/1139 , G03G15/0812 , G03G2215/0609
Abstract: A developing device includes a developing container storing a two-component developer containing a magnetic carrier and a toner, a developer carrying member carrying the developer on its outer circumferential surface, and a regulation member arranged to be opposed at a prescribed distance to the developer carrying member. The developer carrying member includes a developing sleeve on which a magnetic brush is formed, and a magnet secured in the developing sleeve and having a plurality of magnetic poles including a regulation pole opposed to the regulation member and a downstream-side magnetic pole arranged downstream of the regulation pole with respect to the rotation direction of the developing sleeve. The magnet is such that the vertical magnetic force gradient [mT/°] has a local minimum value near a position at which the vertical magnetic force is 0 [mT] between the downstream-side surface of the regulation member and the downstream-side magnetic pole.
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公开(公告)号：US11782357B2
公开(公告)日：2023-10-10
申请号：US17859307
申请日：2022-07-07
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu Shimizu , Yuji Toyota , Yasuhiro Tauchi
CPC classification number: G03G15/0812 , G03G15/09
Abstract: A developing device includes a developing container storing a two-component developer, a developer carrying member, and a regulation member. The developer carrying member includes a developing sleeve, and a magnet having a regulation pole opposite the regulation member and a main pole opposite the image carrying member. The regulation member is arranged downstream of the position at which the vertical magnetic force of the regulation pole is 0 [mT] but upstream of a position at which the vertical and horizontal magnetic forces of the regulation pole are equal. Let the horizontal magnetic force gradient at the position at which the horizontal magnetic force of the main pole is 0 [mT] be A and the horizontal magnetic force gradient at the upstream-side surface of the regulation member along the rotation direction of the developing sleeve be B, then |A|>2.45 and |B|
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公开(公告)号：US11163243B2
公开(公告)日：2021-11-02
申请号：US17206261
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, in order, a first direct current voltage determination mode (first DC calibration) for determining a provisional reference direct current voltage that is a provisional reference for a direct current voltage of a developing bias applied to a developing roller, 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 an image forming operation, and a second direct current voltage determination mode (second DC calibration) for determining a reference direct current voltage that is a reference for the direct current voltage of the developing bias applied to the developing roller in the image forming operation.
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公开(公告)号：US10232635B2
公开(公告)日：2019-03-19
申请号：US15687959
申请日：2017-08-28
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuji Toyota
IPC: B41J2/47 , G02B26/10 , B23K26/082 , B41M5/025
Abstract: In an optical scanning device including a vibration mirror part, elastically deformable resin portions are respectively provided at both end portions in a main scanning direction on a surface of the vibration mirror part, which is an opposite surface of a reflective surface, a collision member, which has a collision surface and can collide with each of the resin portion, is provided at a side opposite to a side of the reflective surface of the vibration mirror part, and a control unit allows the vibration mirror part to swing such that each of the resin portion collides with the collision surface at least once before light beam for image data writing is deflected and scanned by the vibration mirror part, and then allows the vibration mirror part to swing in a range in which each of the resin portion does not collide with the collision surface.
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公开(公告)号：US09917971B2
公开(公告)日：2018-03-13
申请号：US15331683
申请日：2016-10-21
Applicant: KYOCERA Document Solutions Inc.
Inventor： Hideki Ishida , Yuji Toyota , Hideji Mizutani
CPC classification number: H04N1/053 , H04N1/02409 , H04N1/0283 , H04N1/113 , H04N1/29 , H04N2201/0081 , H04N2201/0094
Abstract: A laser scanning device includes a light source, a deflection portion, an image forming lens, and a light source control portion. The light source emits a light beam. The deflection portion causes the light beam emitted from the light source to scan a scanned surface by deflecting the light beam at a predetermined deflection angle. The image forming lens condenses the deflected light beam on the scanned surface, and causes the light beam to be scanned on the scanned surface in a scanning direction at an equal speed. The light source control portion controls the light source to irradiate the light beam to at least one section area among a plurality of section areas sectioned from each other in the scanning direction on the scanned surface, at a plurality of irradiation timings determined based on a position of the at least one section area in the scanning direction.
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Patent Agency Ranking
公开(公告)号：US20170118368A1
公开(公告)日：2017-04-27
申请号：US15331689
申请日：2016-10-21
Applicant: KYOCERA Document Solutions Inc.
Inventor： Hideki Ishida , Yuji Toyota
CPC classification number: H04N1/0283 , H04N1/0281 , H04N1/03 , H04N1/295 , H04N2201/0094
Abstract: A laser scanning device includes light source, deflection portion, image forming lens, a block position setting portion, and a light source control portion. The image forming lens condenses a light beam deflected by the deflection portion on a scanned surface, and causes the light beam to be scanned on the scanned surface in a scanning direction at an equal speed. The block position setting portion sets one or more block areas which each include a plurality of section areas sectioned from each other on the scanned surface in the scanning direction. The light source control portion controls the light source to irradiate the light beam to the plurality of section areas at a plurality of irradiation timings that are determined for each of the block areas. The block position setting portion shifts set positions of the block areas along the scanning direction for each scan of at least one line.
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公开(公告)号：US20210302867A1
公开(公告)日：2021-09-30
申请号：US17206261
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, in order, a first direct current voltage determination mode (first DC calibration) for determining a provisional reference direct current voltage that is a provisional reference for a direct current voltage of a developing bias applied to a developing roller, 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 an image forming operation, and a second direct current voltage determination mode (second DC calibration) for determining a reference direct current voltage that is a reference for the direct current voltage of the developing bias applied to the developing roller in the image forming operation.
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公开(公告)号：US11112722B1
公开(公告)日：2021-09-07
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：US11048192B1
公开(公告)日：2021-06-29
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 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, a control unit derives a carrier resistance based on the developing current detected by a current detecting unit, and controls an AC amplitude of an AC voltage of the developing voltage based on the carrier resistance.
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公开(公告)号：US20170118369A1
公开(公告)日：2017-04-27
申请号：US15331683
申请日：2016-10-21
Applicant: KYOCERA Document Solutions Inc.
Inventor： Hideki Ishida , Yuji Toyota , Hideji Mizutani
CPC classification number: H04N1/053 , H04N1/02409 , H04N1/0283 , H04N1/113 , H04N1/29 , H04N2201/0081 , H04N2201/0094
Abstract: A laser scanning device includes a light source, a deflection portion, an image forming lens, and a light source control portion. The light source emits a light beam. The deflection portion causes the light beam emitted from the light source to scan a scanned surface by deflecting the light beam at a predetermined deflection angle. The image forming lens condenses the deflected light beam on the scanned surface, and causes the light beam to be scanned on the scanned surface in a scanning direction at an equal speed. The light source control portion controls the light source to irradiate the light beam to at least one section area among a plurality of section areas sectioned from each other in the scanning direction on the scanned surface, at a plurality of irradiation timings determined based on a position of the at least one section area in the scanning direction.
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