Roller Patents (Class 399/176)
  • Patent number: 10866552
    Abstract: An image forming apparatus includes a developing cartridge, a drum cartridge, a casing, a connector, and a controller. The drum cartridge includes a photosensitive drum, a drum cartridge memory, a charger, and a cleaner. The charger is configured to charge the photosensitive drum and including a wire and a grid electrode. The cleaner is configured to clean the wire. The connector is configured to be electrically connected to the drum cartridge memory. Information is writable to the drum memory through the connector. The detection circuit board is configured to detect a state of discharge of the charger. The controller is configured to perform: determining whether or not the state of discharge detected by the detection circuit board is abnormal; and writing, in the drum cartridge memory, information representing occurrence of the abnormal discharge through the connector in a case where occurrence of the abnormal discharge is determined.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: December 15, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Fumitake Tajiri
  • Patent number: 10824087
    Abstract: A charging member includes a conductive substrate, an elastic layer disposed on the conductive substrate, and a surface layer disposed on the elastic layer. Regarding the surface of the surface layer, in the axial direction, the ratio of the mean spacing of profile irregularities Sm to the ten-point mean roughness Rz and the reduced peak height Spk respectively satisfy 15?Sm/Rz?35 and Spk?5 ?m.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: November 3, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiko Kinuta, Shogo Tomari, Hiroko Kobayashi, Kosuke Narita
  • Patent number: 10684582
    Abstract: A pressing member for fixing includes: an axial section; a cylindrical body that includes the axial section internally inserted, rotates following rotation of the axial section, and is extendable in an axial direction relative to the axial section; and an elastic layer that is stacked on an outer circumference of the cylindrical body.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: June 16, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Issei Fujihara
  • Patent number: 10571838
    Abstract: A controller of an image forming apparatus executes acquisition processing of acquiring an area of an image which exists in a predetermined region of a first page where a developer image is first to be formed, heating processing of heating a heating member such that a temperature of the heating member reaches a fixing temperature, and feeding processing of starting feed of a sheet to a process unit after a predetermined period of time elapses from a predetermined timing after a start of print processing. The predetermined region is laid at both end portions in a width direction of the first page. In a case where the area of the image is equal to or smaller than a predetermined value, the controller sets the predetermined period of time in the feeding processing shorter as compared with a case where the area of the image is larger than the predetermined value.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: February 25, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Fumitake Tajiri, Yusuke Mizuno, Tatsuya Koyama, Hisashi Tsukawaki
  • Patent number: 10571822
    Abstract: An object of the present invention is to provide a charging roller in which detachment of particles from a surface layer as well as abrasion and scraping of the particles, which are caused by contact and the like with other member such as a photoreceptor during the use, are unlikely to occur. The charging roller includes: a shaft 1; and an elastic layer 2 and a surface layer 3, which are sequentially formed on the outer circumference of the shaft 1. The surface layer 3 is composed of a mixture of a surface layer resin composition and particles, the surface layer resin composition has a tensile elongation at break of 51% or greater, and the particles have a reaction force of 1.0 to 10.3 mN under 1-?m compression.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: February 25, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takehiro Sano
  • Patent number: 10558149
    Abstract: A roller for electrophotography that has a low electric resistance value and that is still further reduced in contaminating property of other member is provided. The roller includes an electro-conductive mandrel and a surface layer having an electro-conductive foam. The electro-conductive foam includes a vulcanized product of an unvulcanized rubber composition including an acrylonitrile-butadiene rubber and a hydrin rubber. The vulcanized product has a matrix-domain structure having a sea phase and an island phase, contains ethylene oxide of 8.0% by mass or more and 20.0% by mass or less based on a total amount of the vulcanized product, and has a spin-spin relaxation time T2 of 750 ?s<T2<930 ?s.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hirobumi Takahashi, Yoshimasa Sawada, Shoji Inoue
  • Patent number: 10558136
    Abstract: A charging member including an electro-conductive support; and an elastic layer, the elastic layer is a surface layer thereof and is constituted by a mono layer, the elastic layer includes domains and a matrix, an outer surface of the charging member is constituted by a surface of the matrix and surfaces of the domains, and the charging member has concave portions on the outer surface, the domains exist at bottom portions of the respective concave portions and are exposed to the outer surface of the charging member only at the bottom portions of the respective concave portions, the elastic layer has a volume resistivity of 1×105 ?cm or more and 1×108 ?cm or less, and A2 is 20 times or more of A1, wherein A1 and A2 are current values obtained by a prescribed method.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 10551763
    Abstract: An image forming apparatus includes a photosensitive member, a charging roller, a cleaning roller, an urging member and an image forming portion. The charging roller has an outermost surface layer including an electroconductive resin material, first surface particles having an average particle size of more than 7 ?m and less than 30 ?m and second surface particles having an average particle size of more than 2 ?m and less than 6 ?m. The first and second surface particles are dispersed in the electroconductive resin material so as to form first projections and second projections, respectively. The cleaning roller cleaning roller includes a shaft portion and an elastic cleaning portion extending helically around the shaft portion and having a rectangular cross-section perpendicular to an extending direction thereof.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: February 4, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Michihiro Yoshida, Takeshi Fujino, Kota Mori, Yuya Nagatomo, Jiro Kinokuni
  • Patent number: 10538109
    Abstract: A scanning path of light includes a synchronization detection area A where a synchronization detection sensor 47 detects scanning light and an image writing area B where writing of the image data to a photosensitive drum 11 is performed by the scanning light, and a light amount change unit 100 is configured to reduce a change amount of a light amount in the synchronization detection area A as compared with the image writing area B.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: January 21, 2020
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Issei Nakano
  • Patent number: 10520845
    Abstract: Provided are a charging member coupleable to an electrophotographic imaging apparatus. The charging member includes an electrically-conductive support body, an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body, and an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer. The electrically-conductive resin layer includes a binder resin and particles comprising at least one type of particles selected from resin particles and inorganic particles, wherein a relative dielectric constant (?r1) of the binder resin is greater than or about equal to a relative dielectric constant (?r2) of at least one type of particles.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: December 31, 2019
    Assignee: HP PRINTING KOREA CO., LTD.
    Inventor: Noriaki Kuroda
  • Patent number: 10488790
    Abstract: A control unit can execute regulation control referred to as active transfer voltage control (ATVC) for setting a transfer voltage output from a second voltage unit to a transfer member so as to transfer a toner image from a photosensitive member to a transfer material based on an electric current value detected by a detection unit and a voltage value output from a voltage output unit. When changing a voltage value output from the voltage output unit during execution of the ATVC, the control unit interrupts execution of a predetermined operation of the ATVC in a predetermined time period including a point of time including when the voltage output from the voltage output unit is changed.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shimpei Ishikawa
  • Patent number: 10488780
    Abstract: An imaging device includes a photoconductive drum charged by a charge roll and opposed by a transfer roll to transfer an image from the drum. The drum becomes biased to a negative voltage by setting charges of negative voltage on both the charge roll and transfer roll. A controller switches the bias of the transfer roll to a positive voltage from the negative voltage and a delta or difference in a charge of the drum is determined from before and after the switching. Based on the delta, the voltage on the charge roll is boosted by a boost voltage to improve the charge on the drum. In this way, deteriorating or defective charge rolls can be still used to charge the drum to a proper voltage for imaging. Techniques for determining the delta, the boost and the magnitude of voltage charges are further embodiments.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: November 26, 2019
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Michael Brian Bacelieri, Douglas Anthony Able, Andrew Pryse Dale, Jared Kuohui Lin, Robert Watson McAlpine, Matthew Russell Smither
  • Patent number: 10466611
    Abstract: An object of the present invention is to provide a charging roller in which detachment of particles from a surface layer as well as abrasion and scraping of the particles, which are caused by contact and the like with other member such as a photoreceptor during the use, are unlikely to occur. The charging roller includes: a shaft 1; and an elastic layer 2 and a surface layer 3, which are sequentially formed on the outer circumference of the shaft 1. The surface layer 3 is composed of a mixture of a surface layer resin composition and particles, the surface layer resin composition has a tensile elongation at break of 51% or greater, and the particles have a reaction force of 1.0 to 10.3 mN under 1-?m compression.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: November 5, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takehiro Sano
  • Patent number: 10423120
    Abstract: A cartridge includes a photosensitive member, a roller including a core metal shaft and a coating layer, roller supporting portions, and a regulating portion for regulating a position of the roller with respect to a longitudinal direction of the roller. The roller supporting portions are provided so as to support one end portion and an other end potion of the core metal shaft, respectively, with respect to a direction of a rotational axis of the roller. The roller is further provided with cylindrical holes disposed at respective ends of the core metal shaft with respect to the direction of the rotational axis and extending in the direction of the rotational axis with the rotational axis as a center. The roller is supported by the roller supporting portions at inner peripheral surfaces of the holes.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: September 24, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamaguchi, Hiroomi Matsuzaki
  • Patent number: 10401779
    Abstract: A charge roller includes, in a surface thereof, recesses that have sizes that are equivalent to or larger than a volume average particle diameter of a toner accommodated in a developing unit and that are capable of collecting the toner retransferred to a photosensitive drum.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: September 3, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Katagiri, Tsuguhiro Yoshida, Shuichi Tetsuno, Takayuki Tanaka, Takahiro Ikeda, Satoru Motohashi, Takumi Furukawa
  • Patent number: 10365575
    Abstract: A charging member includes a cylindrical, hollow or solid, electroconductive base member, and an elastic layer device disposed on the electroconductive base member. When a surface profile of the charging member is subjected to a periodicity analysis in a circumferential direction, the surface profile has a maximum amplitude, in a period region of smaller than 5 mm, within a range of higher than or equal to 0.20 ?m and smaller than or equal to 0.90 ?m.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: July 30, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiko Kinuta, Takuya Yamamoto, Yuki Tagawa
  • Patent number: 10365574
    Abstract: An image carrying member unit has an image carrying member, a charging member, a pair of first bearing members, a biasing member, and a supporting frame. The image carrying member is rotatable, and an electrostatic latent image is formed on it. The charging member is arranged in contact or close to the image carrying member, and electrostatically charges the image carrying member. The first bearing members support the charging member movably in directions to and away from the image carrying member. The biasing member biases the charging member toward the image carrying member. The supporting frame supports the image carrying member and the first bearing members. The first bearing members each have a fulcrum rotatably supported on the supporting frame, an arm extending radially from the fulcrum, and a bearing portion formed at a tip end of the arm and supporting axially either end of the charging member.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: July 30, 2019
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Hiroki Morishita
  • Patent number: 10338493
    Abstract: A developing roller (1) is provided, which includes a tubular porous inner layer (2) of a foamed product of a semiconductive rubber composition containing an ethylene propylene rubber and a paraffin oil, and an outer layer (4) of a seamless tube of a semiconductive thermoplastic polyamide elastomer provided on an outer peripheral surface (3) of the inner layer (2), and has an overall Asker-C hardness of not less than 30 degrees and not greater than 60 degrees. A production method is also provided, which includes the steps of: preparing a tube having a thickness T of 100 to 400 ?m and having an inner diameter D2 for an outer layer; preparing a tubular inner layer having an outer diameter D1; and press-inserting the inner layer into the tube; wherein an interference represented by a difference D1- D2 between the outer diameter D1 of the inner layer and the inner diameter D2 of the tube is 100 to 400 ?m.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: July 2, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Yuta Imase
  • Patent number: 10310402
    Abstract: An image forming apparatus includes a photosensitive member having a surface having elastic deformation power of 47% or more, a charging roller forming a nip between itself and the photosensitive member, and an image forming portion. When a nip region corresponding to the nip is formed and then an area of independent contact portions between the charging member and a measuring contact member is measured, the following relationship is satisfied: (contact width X)×(Contact area ratio ?)?0.1, where a length from a position of one end to a position of the other end of the nip region with respect to a direction perpendicular to a longitudinal direction of the charging roller is the contact width X, and a ratio of a sum of areas of the independent contact portions to an entire area of a measuring region is the contact area ratio ?.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: June 4, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Kinokuni, Kota Mori, Yuya Nagatomo, Michihiro Yoshida, Takeshi Fujino
  • Patent number: 10289019
    Abstract: An image forming apparatus configured to, in a case where a difference between a charging current flowing through a first charging roller and a charging current flowing through a second charging roller is larger than a first threshold value, perform first cleaning processing in which a cleaning ability of one cleaner of a first cleaner and a second cleaner, which corresponds to one of the first charging roller and the second charging roller, is lower than a cleaning ability of another cleaner of the first cleaner and the second cleaner, which corresponds to another of the first charging roller and the second charging roller, a charging current flowing through the one charging roller being larger than a charging current flowing through the other charging roller.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: May 14, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Hotaka Kakutani, Kazutoshi Kotama, Chieko Mimura, Kengo Yada, Shota Iriyama
  • Patent number: 10268132
    Abstract: A charging roller includes a surface layer containing first and second surface particles and satisfying the following: 6.0 (?m)?Rz?18.8 (?m),??i where Rz is a ten-point average roughness (?m) of a charging roller surface, 7 (?m)?d?20 (?m),??ii where d is a thickness (?m) of the surface layer, 9.8 (?m)?D1?15.8 (?m) and 2.8 (?m)?D2?5.2 (?m),??iii where D1 and D2 are average particle size (?m) of the first surface particles, and the second surface particles, respectively, 3.0?D1/D2?5.6, and??iv 0.10?M1/(M1+M2)?0.32,??v where M1 is a total weight (mg) of the first surface particles per unit area of the charging roller surface, and M2 is a total weight (mg) of the second surface particles per unit area of the charging roller surface.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: April 23, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Fujino, Kota Mori, Yuya Nagatomo, Michihiro Yoshida, Jiro Kinokuni
  • Patent number: 10268133
    Abstract: This conductive roll includes: at least one elastic layer 12 including primarily a conductive rubber body and provided along the outer periphery of a core 11; and a coating layer 14 provided along the outer periphery of the elastic layer 12. The conductive roll satisfies the following expressions: circumference Sm1?135 ?m and circumference Sm1<circumference Sm2 wherein circumference Sm1 represents an average interval Sm of irregularities along the circumferential direction of the elastic layer 12, and circumference Sm2 represents an average interval Sm of irregularities along the circumferential direction of the coating layer 14.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: April 23, 2019
    Assignees: NOK CORPORATION, SYNZTEC CO., LTD., NOK KLUEBER CO., LTD.
    Inventors: Kousuke Oura, Hiroshi Ogura, Masaki Tahara
  • Patent number: 10248042
    Abstract: The electrophotographic roller has a surface layer comprising an electro-conductive elastic layer on an electro-conductive substrate. The opening of a bowl-shaped resin particle is exposed on the surface of the electrophotographic roller. The number of contact portions of the convex portion with the glass plate in a square region where a length of a nip in a direction along the circumferential direction of the electrophotographic roller of a nip formed by pressing the roller on the glass plate with a specific load applied as the length of one side and is located at any position in the nip is 8 or more. The average value of the areas of the contact portions is 10 ?m2 to 111 ?m2. The variation coefficient of the areas of the contact portions and the variation coefficient D of the areas of a plurality of Voronoi regions each including a contact portion satisfy specific relationships.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: April 2, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Atsushi Uematsu, Mototeru Goto, Masataka Kodama
  • Patent number: 10209642
    Abstract: A charge roller in an image-forming apparatus of a DC electrification mode mitigates occurrence of black lines and prevents fogging. The charge roller has a core, an elastic layer on the core, and a surface treatment layer on the surface of the elastic layer. The elastic layer is a vulcanized rubber composition containing a rubber base mainly containing an epichlorohydrin-based rubber, and additives including a conductivity-imparting agent, an inorganic filler, a vulcanization accelerator, and a vulcanizing agent. The ratio of the conductivity-imparting agent and the inorganic filler, to the entire rubber composition, is 11 mass % or less. The surface treatment layer is formed by impregnating the elastic layer with a surface treatment liquid prepared by dissolving an isocyanate compound in an organic solvent. The roller has a roller surface roughness Rz of 10 ?m or less.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: February 19, 2019
    Assignee: SYNZTEC CO., LTD.
    Inventors: Yuka Moriyasu, Hiroshi Ogura, Tomohiro Murata
  • Patent number: 10191404
    Abstract: A charging member is provided having an electroconductive substrate, and a resin layer on the substrate, in which the charging member has an area on the surface of the charging member, the area including a compound represented by the following formula (1),
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: January 29, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Yamauchi, Masataka Kodama, Noriko Suzumura
  • Patent number: 10191405
    Abstract: The present teachings describe a bias charging member. The charging member includes a conductive core and an outer surface layer disposed on the conductive core. The outer surface layer includes a crosslinked hydroxyl terminated poly(oxetane) based fluorinated polyether and an aminoplast resin.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: January 29, 2019
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Lin Ma
  • Patent number: 10162284
    Abstract: A developing device includes a container that contains developer; a rotating body that rotates while carrying the developer and supplies the developer to a latent image formed on an image carrier; a channel through which air in the container is discharged out of the container; a first member that is positioned downstream of a position at which the developer is separated from the rotating body in a rotation direction of the rotating body and with which the developer separated from the rotating body comes into contact; and a second member that is positioned downstream of the first member in the rotation direction of the rotating body and with which the developer separated from the rotating body comes into contact.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: December 25, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinichi Kuramoto, Yoshitaka Nakajima, Ayumi Noguchi
  • Patent number: 10125236
    Abstract: To provide an elastic roll for an electro-photographic apparatus that includes an elastic body layer having a low hardness and being excellent in fatigue resistance, and thus is resistant to fatigue, and to provide a method for manufacturing the same. An elastic roll 10 for an electrophotographic apparatus includes a shaft body 12, and a foamed elastic body layer 14 provided on an outer periphery of the shaft body 12, wherein the foamed elastic body layer 14 consists of a silicone rubber foamed body including a plurality of air bubbles 18 in its base material containing cross-linked silicone rubber and a reinforcement material, and wherein the foamed elastic body layer has a communication degree of 40% or more. It is preferable that the elastic roll 10 should further include a skin layer 14a in the foamed elastic body layer 14 on an outer peripheral side.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: November 13, 2018
    Assignee: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Ryosuke Yamaoka, Yasunori Nimura, Takahiro Morita, Satoshi Tatsumi, Kousuke Minematsu, Junichiro Suenaga
  • Patent number: 10101690
    Abstract: An image forming apparatus includes an image bearer including a first image portion to bear a first toner image, a second image portion to bear a second toner image, and a non-image portion to bear an adjustment pattern. A transferor forms a transfer nip with the image bearer. A controller controls the power source to output an image bias as a transfer bias to transfer the first toner image and the second toner image onto a first recording medium and a second recording medium, respectively, in the transfer nip when the first image portion and the second image portion pass through the transfer nip and output a non-image bias as the transfer bias when the non-image portion passes through the transfer nip. The controller performs a constant current control on the image bias and performs a constant voltage control when the image bias switches to the non-image bias.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 16, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Sugiura, Naohiro Kumagai, Seiichi Kogure, Junpei Fujita, Kazuki Yogosawa, Yuuji Wada, Jyunya Sakuraba
  • Patent number: 10078287
    Abstract: Provided is an image forming apparatus capable of appropriately setting a range of a charging voltage for electrically charging an image bearing member. A charging roller (2) and a charging power source (S1) are configured to apply a voltage between the charging roller (2) and a photosensitive drum (1) to electrically charge the photosensitive drum (1). A control circuit (13) is configured to set a voltage for obtaining a predetermined discharge current by the charging roller (2) with the photosensitive drum (1). The control circuit (13) is configured to determine, depending on a state of a resistance acting on an electric current flowing between the charging roller (2) and the photosensitive drum (1), at least one of an upper limit or a lower limit of the voltage set by the control circuit (13).
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: September 18, 2018
    Assignee: CANON FINETECH NISCA INC.
    Inventor: Yuki Nagahashi
  • Patent number: 10025215
    Abstract: A charging member includes a support member, and a surface layer which is provided on the support member and contains a non-conductive porous filler particle and a conductive material present in pores of the non-conductive porous filler particle. The charging member may be included in a process cartridge that is detachable from an image forming apparatus.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: July 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takuya Morishige
  • Patent number: 10025216
    Abstract: Provided is a charging member capable of suppressing the occurrence of an image defect due to the non-uniform abrasion of a photosensitive member and a stain, in a long-term use. The charging member includes an electro-conductive elastic layer as a surface layer. The electro-conductive elastic layer contains a binder and a bowl-shaped resin particle having an opening. The surface of the charging member has a concavity and a protrusion derived from the bowl-shaped resin particle. The relations represented by the following formulae are satisfied, 0.2 ? S = ? S ? ? 5 - S ? ? 1 ? S ? ? 1 ? 0.5 0.15 ? d = ? d ? ? 5 - d ? ? 1 ? d ? ? 1 ? 0.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: July 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama
  • Patent number: 9989879
    Abstract: A charging member is provided which can prevent electrostatic adhesion of a toner and/or an external additive of the toner to the surface of the charging member, and exhibits stable charging performance during long-term use. The charging member comprises a support, and a surface layer on the support, and the surface layer comprises a polymetalloxane containing at least one metal atom selected from the group consisting of aluminum, titanium, zirconium and tantalum, and a specific group which is bonded to the at least one metal atom in the polymetalloxane.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: June 5, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Noriyuki Doi, Masataka Kodama, Kineo Takeno
  • Patent number: 9983516
    Abstract: A roller for electrophotography that has a low electric resistance value and that is still further reduced in contaminating property of other member is provided. The roller includes an electro-conductive mandrel and a surface layer having an electro-conductive foam. The electro-conductive foam includes a vulcanized product of an unvulcanized rubber composition including an acrylonitrile-butadiene rubber and a hydrin rubber. The vulcanized product has a matrix-domain structure having a sea phase and an island phase, contains ethylene oxide of 8.0% by mass or more and 20.0% by mass or less based on a total amount of the vulcanized product, and has a spin-spin relaxation time T2 of 750 ?s<T2<930 ?s.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: May 29, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hirobumi Takahashi, Yoshimasa Sawada, Shoji Inoue
  • Patent number: 9958802
    Abstract: Provided is an electroconductive member for electrophotography capable of charging an electrically chargeable body stably over a long period of time. The electroconductive member includes an electroconductive support and a surface layer on the electroconductive support. The surface layer has a skeleton that is three-dimensionally continuous and a pore that communicates in a thickness direction, and when any region measuring 150 ?m per side of a surface of the surface layer is photographed and equally divided into 60 parts in a vertical direction and 60 parts in a horizontal direction to form 3,600 squares, the number of squares including through holes is 100 or less. The skeleton is non-electroconductive and includes a plurality of particles connected to each other through a neck, and an average value D1 of circle-equivalent diameters of the particles is 0.1 ?m or more and 20 ?m or less.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: May 1, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuichi Kikuchi, Kazuhiro Yamauchi, Norifumi Muranaka, Tetsuo Hino, Satoru Nishioka
  • Patent number: 9904203
    Abstract: This image forming apparatus includes an image carrier, a charging member, a capacitor, a voltage control portion, and a current conduction control portion. The charging member is configured to charge the image carrier. The capacitor is connected on a current conduction path connecting the charging member and a ground. The voltage control portion is configured to control whether or not to apply DC voltage to the charging member. The current conduction control portion is configured to make the current conduction path conductive after DC voltage is applied by the voltage control portion, and to disconnect the current conduction path before application of DC voltage by the voltage control portion is stopped.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: February 27, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Kohei Moriguchi
  • Patent number: 9897946
    Abstract: A roller member includes a cored bar, an elastic layer, a first high resistance member, and a second high resistance member. The elastic layer is disposed on an outer circumferential face of the cored bar. The cored bar has a projecting portion projecting beyond a range in which the elastic layer is disposed, toward an axial end of the cored bar. The first high resistance member is made of a high-resistance material having a higher electrical resistance than an electrical resistance of the cored bar. The first high resistance member is fitted to the projecting portion. The second high resistance member is made of a high-resistance material having a higher electrical resistance than an electrical resistance of the cored bar. The second high resistance member fills a space between the first high resistance member and the elastic layer.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: February 20, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masakazu Imai, Masaharu Furuya, Tsutomu Kato, Katsuhito Haruno, Osamu Ichihashi, Tatsuya Ohsugi
  • Patent number: 9880490
    Abstract: A nonporous semiconductive roller is provided, which constantly ensures proper image formation substantially without image density unevenness attributable to the roughness of an outer peripheral extrusion surface thereof when being used as a developing roller. The semiconductive roller (1) is made of a nonporous crosslinking product of a rubber composition which contains a rubber component including only four types of rubbers including an epichlorohydrin rubber, a chloroprene rubber, a butadiene rubber and an acrylonitrile butadiene rubber.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: January 30, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi Kuroda, Kei Tajima
  • Patent number: 9857734
    Abstract: An image forming apparatus includes a plurality of image bearers, a plurality of developing devices, a plurality of first transfer devices disposed opposite the plurality of image bearers, a second transfer device, a cleaning device to remove toner remaining on the intermediate transferor after a secondary transfer process, and a processor to control the plurality of developing devices to perform a refresh process to discharge toner from the plurality of developing devices to the plurality of image bearers. Among toner of the colors, toner having a first circularity first reaches the cleaning device and toner having a second circularity higher than the first circularity subsequently reaches the cleaning device in the refresh process.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: January 2, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Sakashita, Kenji Nakamura, Masanari Fujita, Yuuji Meguro, Takahiro Seki, Naoki Takai, Takuya Akiyama
  • Patent number: 9846381
    Abstract: A resistive film is applied to a conductive substrate. Ductile particles are disposed substantially uniformly throughout the resistive film. Brittleness of the resistive film is thereby reduced.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: December 19, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Thomas Anthony, Seongsik Chang
  • Patent number: 9823598
    Abstract: A conductive member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer contains a resin and insulating particles. The insulating particles account for 50% or more and 70% or less of an area of a cross-section of the surface layer taken in a thickness direction.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: November 21, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukiko Kamijo, Taketoshi Hoshizaki
  • Patent number: 9817328
    Abstract: A charging member includes a support member, a conductive elastic layer disposed on the support member, and a front surface layer disposed on the conductive elastic layer. Irregularities with a cycle of shorter than 0.1 mm and irregularities with a cycle of 0.1 mm or longer are distributed on an entirety of an outer circumferential surface of the charging member, and satisfy the following conditions of (1) and (2): (1) the irregularities with the cycle of shorter than 0.1 mm have an average height of greater than 0 ?m and 4 ?m or less; and (2) the irregularities with the cycle of 0.1 mm or longer have an average height of from 5 ?m to 30 ?m. A half-value width of a maximum frequency value of height distribution on the outer circumferential surface is from 1 ?m to 3 ?m.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: November 14, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hiroyuki Miura, Kosuke Narita, Yoshiyuki Hayashi
  • Patent number: 9753391
    Abstract: A charging member includes a support member, a conductive elastic layer disposed on the support member, and a front surface layer disposed on the conductive elastic layer. Irregularities with a cycle of shorter than 0.1 mm and irregularities with a cycle of 0.1 mm or longer are distributed on an entirety of an outer circumferential surface of the charging member, and satisfy the following conditions of (1) and (2): (1) the irregularities with the cycle of shorter than 0.1 mm have an average height of from 8 ?m to 11 ?m; and (2) the irregularities with the cycle of 0.1 mm or longer have an average height of from 2 ?m to 5 ?m. A half-value width of the maximum frequency value of height distribution on the outer circumferential surface is from 1 ?m to 3 ?m.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: September 5, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kosuke Narita, Hiroyuki Miura, Yoshiyuki Hayashi
  • Patent number: 9746793
    Abstract: An image formation apparatus includes: a first image formation unit including a first image carrier and a first charging member that charges the first image carrier, the first image formation unit using a first developer and; a second image formation unit including a second image carrier and a second charging member that charges the second image carrier, the second image formation unit using a second developer; and a controller that determines a first charging voltage correction amount for correcting a charging voltage to be applied to the first charging member according to an amount of usage of the first image carrier, and determines a second charging voltage correction amount for correcting a charging voltage to be applied to the second charging member according to an amount of usage of the second image carrier. The second charging voltage correction amount is larger than the first charging voltage correction amount.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: August 29, 2017
    Assignee: Oki Data Corporation
    Inventor: Hidetaka Mitsunobu
  • Patent number: 9746792
    Abstract: A charging member includes a support member, a conductive elastic layer disposed on the support member, and a front surface layer disposed on the conductive elastic layer. Irregularities with a cycle of shorter than 0.1 mm and irregularities with a cycle of 0.1 mm or longer are distributed on an entirety of an outer circumferential surface of the charging member, and satisfy the following conditions of (1) and (2): (1) The irregularities with the cycle of shorter than 0.1 mm have an average height of 5 ?m to 8 ?m; and (2) The irregularities with the cycle of 0.1 mm or longer have an average height of 6 ?m to 30 ?m. A half-value width of a maximum frequency value of a height distribution on the outer circumferential surface is 1 ?m to 3 ?m.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: August 29, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshiyuki Hayashi, Hiroyuki Miura, Kosuke Narita
  • Patent number: 9740133
    Abstract: An electrophotographic charging member in which the adhesion of contamination is more suppressed is provided. The electrophotographic charging member includes an electro-conductive support and an electro-conductive elastic layer on the electro-conductive support, the electro-conductive elastic layer includes 10% by mass or more and 50% by mass or less of an aggregate of crosslinked rubber particles, the aggregate of the crosslinked rubber particles has a circle-equivalent diameter of 10 ?m or more and 50 ?m or less, the crosslinked rubber particles have one of an acrylic resin and a styrene acrylic resin chemically bonded to a surface thereof, the charging member has a protrusion derived from the aggregate of the crosslinked rubber particles on a surface thereof, and the protrusion has an average height of 50 nm or more and 200 nm or less.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: August 22, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Yamauchi, Kazuhiro Yamauchi, Satoru Nishioka, Hiroki Masu, Noriko Suzumura
  • Patent number: 9720344
    Abstract: An image forming apparatus includes a charger, a charge eliminator, and a controller. The charger charges a surface of an image carrier. The charge eliminator eliminates residual charge from the surface of the image carrier charged by the charger. The controller performs control to reduce a level of charge elimination performed by the charge eliminator during a third period compared to a level of charge elimination performed by the charge eliminator during a second period in which an image for determining an image-forming condition is formed. The third period is a period other than the second period within a first period that is a period, other than a period of normal image formation, during which the surface of the image carrier is charged by the charger.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: August 1, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Hirofumi Hamada
  • Patent number: 9720343
    Abstract: A conductive member includes a substrate, an elastic layer formed on the substrate, and a surface layer formed on the elastic layer, wherein the surface layer has a sea-island structure that includes a sea portion at least containing a first resin and a conductive agent and island portions at least containing a second resin, the island portions have an average diameter of approximately at least 100 nm and not greater than 1/10 of the thickness of the surface layer, and the conductive agent contained in the sea portion is unevenly distributed in the vicinity of the interface of the sea portion with the island portions.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: August 1, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukiko Kamijo, Taketoshi Hoshizaki, Hidemi Nukada
  • Patent number: 9703226
    Abstract: A charging member, one embodiment of which includes a conductive support; a conductive elastomer layer stacked on the conductive support; and a conductive resin layer stacked on the conductive elastomer layer, wherein the conductive resin layer includes: a matrix material; and a plurality of particles dispersed in the matrix material, wherein the particles include first particles, and when a thickness of a portion formed of the matrix material alone of the conductive resin layer is referred to as A [?m], an average particle size of the first particles is referred to as B1 [?m], and an interparticle distance of the particles is referred to as Sm [?m], then A is in a range of 1.0 ?m to 7.0 ?m, B1/A is in a range of 5.0 to 30.0, and Sm is in a range of 50 ?m to 400 ?m.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: July 11, 2017
    Assignee: S-PRINTING SOLUTION CO., LTD.
    Inventor: Noriaki Kuroda
  • Patent number: 9658544
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, a photosensitive layer provided on the electroconductive substrate, and an inorganic surface layer provided on the photosensitive layer, wherein a layer constituting an outermost surface of the photosensitive layer contains from 30% by weight to 70% by weight of silica particles and contains a biphenyl copolymerization type polycarbonate resin including a structural unit represented by the formula (PCA) and a structural unit represented by the formula (PCB) at a copolymerization ratio (PCA:PCB (molar ratio)) of 10:90 to 50:50: wherein, RP1, RP2, RP3, and RP4 each represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and XP1 represents a phenylene group, a biphenylene group, a naphthylene group, an alkylene group, or a cycloalkylene group.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: May 23, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideya Katsuhara, Takashi Imai, Takeshi Iwanaga, Masaki Hirakata, Tatsuki Sano