Charging Patents (Class 399/168)
  • Patent number: 10627760
    Abstract: In an example, a method includes charging a photoconductive surface in a print apparatus and monitoring an electrical parameter associated with a proximity of a print apparatus component to the photoconductive surface. A relative spacing between the print apparatus component and the photoconductive surface may be changed and a contact between the print apparatus component and the photoconductive surface may be detected when the electrical parameter meets predetermined criteria.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: April 21, 2020
    Assignee: HP Indigo B.V.
    Inventors: Meir Grinstein, Asaf Shoshani, Sharon Elbaz
  • Patent number: 10606202
    Abstract: An image forming apparatus includes a photoconductor, a charging roller to charge the photoconductor, a power source to apply a charging bias to the charging roller, a current sensor to generate a feedback signal representing an output current flowing from the charging roller to the photoconductor, a memory, and circuitry. The circuitry calculates film thicknesses of a photoconductor film of the photoconductor at a plurality of points of time based on a voltage of the charging bias and the output current, calculates travel distances of the photoconductor charged at the plurality of points of time, associates the film thicknesses with the travel distances, stores the film thicknesses and the travel distances in the memory, calculates a present estimated film thickness based on the film thicknesses and the travel distances, and calculates an estimated film thickness range corresponding to a present travel distance based on the present estimated film thickness.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: March 31, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yasuhide Matsuno, Takahiro Yoshimi, Shinji Minami
  • Patent number: 10437169
    Abstract: Examples of charging a photoconductive layer in an image forming apparatus are described. In one example, a method includes applying a charging voltage to the photoconductive layer and measuring surface voltages of the photoconductive layer at a plurality of positions on the photoconductive layer. Based on the measured surface voltages, a correction voltage profile is determined. The determined correction voltage profile includes at least a first correction voltage associated with a first position on the photoconductive layer and a second correction voltage associated with a second position, different to the first position, on the photoconductive layer. The method includes applying the first correction voltage to the photoconductive layer and applying the second correction voltage to the photoconductive layer.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: October 8, 2019
    Assignee: HP Indigo B.V.
    Inventors: Ran Waidman, Sasi Moalem, Kobi Shkuri
  • Patent number: 10185266
    Abstract: After a predetermined period elapses since the start of use of a photosensitive member, if a calculated value calculated from a detection current between a charging unit and a photosensitive member is out of a predetermined range, a determining unit does not perform determination using a currently calculated value and, if the calculated value is within the predetermined range, the determining unit performs determination using the currently calculated value.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: January 22, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shingo Hirota
  • Patent number: 10156805
    Abstract: In one example, a device includes a flexible roller and an actuator to flex the roller while it is rotating to change the gap between the roller and a surface opposite the roller.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: December 18, 2018
    Assignee: HP Indigo B.V.
    Inventors: Avichay Mor-Yosef, Ami Halfon
  • Patent number: 10114308
    Abstract: In one example, a method for calibrating a position of a charge roller is described. The method may include a processor positioning a first end of a charge roller to a first plurality of index positions, determining a capacitance between the charge roller and a photoconductor imaging plate at each of the first plurality of index positions, determining a first index position of the first plurality of index positions with a greatest change in capacitance, and calibrating a position of the charge roller based upon the first index position.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: October 30, 2018
    Assignee: HP Indigo B.V.
    Inventors: Shmuel Borenstain, Ami Halfon, Henryk Birecki, Seongsik Chang
  • Patent number: 9904199
    Abstract: Provided a charging member including an electro-conductive support and a surface layer, the surface layer having in an outer surface thereof, concave portions and holding an elastic particle in each of the concave portions, the elastic particle being exposed at a surface of the charging member to form a convex portion in the surface of the charging member, and a part of a wall of each of the concave portions constituting a part of the surface of the charging member.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: February 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenya Terada, Takumi Furukawa, Hiroaki Watanabe, Yuya Tomomizu, Toshiro Suzuki, Kenichi Yazawa, Kazuhiro Gesho
  • Patent number: 9846383
    Abstract: An image formation device in which an image carrier is charged by a charging member includes: a power source configured to supply a charge voltage to the charging member, the charge voltage being formed such that an AC voltage is superimposed on a DC voltage; a detection unit configured to detect an alternating current value flowing through the charging member; and a control unit configured to control a peak-to-peak voltage value of the AC voltage, wherein the control unit executes: first processing of sequentially supplying a plurality of charge voltages from the power source to the charging member in non-image formation; second processing of obtaining, from an alternating current value detection result, a third approximate function indicating a difference value between a first approximate function and a second approximate function; and third processing of determining one of different predetermined ranges and determining a peak-to-peak voltage value in image formation.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: December 19, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventor: Hisashi Murata
  • Patent number: 9696661
    Abstract: A method of operating an imaging device is disclosed. The imaging device is designed to start the imaging process before picking a sheet. During a pick retry, the device waits to start the imaging process until after the sheet is picked successfully. This method improves pick reliability and reduces wasted toner. Other systems and methods are disclosed.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: July 4, 2017
    Assignee: Lexmark International, Inc.
    Inventors: Benjamin Charles DeVore, Delbert Lester Elliott, James Marion Nimmo, David Anthony Schneider
  • Patent number: 9568851
    Abstract: An image forming apparatus that forms an image on a medium includes: an image carrying member; a charging unit disposed in proximity to the image carrying member; a power supply unit configured to sequentially apply a plurality of charging voltages to the charging unit when the medium is not fed through; a current detecting unit configured to detect an AC value flowing through the charging unit; a processing unit configured to perform first charging voltage determination control to derive a peak-to-peak voltage value to be used in a process; and a storage unit configured to pre-store a reference peak-to-peak voltage value for each wastage level of the image carrying member, wherein the processing unit: prohibits execution of the first charging voltage determination control and performs second charging voltage determination control; and obtains a reference peak-to-peak voltage value and derives a peak-to-peak voltage value to be used in the process.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: February 14, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hisashi Murata, Kazuki Kobori, Hirohisa Shirai, Masato Kimura
  • Patent number: 9414475
    Abstract: A discharge device includes a body including a plurality of dielectric layers stacked one above another, a discharge electrode disposed in the body, an induction electrode disposed in the body to face the discharge electrode with at least one of the dielectric layers interposed therebetween, and a heater electrode disposed in a layer different from a layer in which the discharge electrode is disposed, and different from a layer in which the induction electrode is disposed.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: August 9, 2016
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yasuhiko Shimanaka
  • Patent number: 9335650
    Abstract: There are provided an image forming apparatus in which the generation of lateral streak images due to a decrease in the in-nip discharge intensity is suppressed while at the same time the generation of spot-like images due to abnormal discharge caused by smudges on the surface of a charging member is suppressed, and a process cartridge. The image forming apparatus and the process cartridge each has: a charging member containing a resin particle having a plurality of pores inside thereof; and a toner in which the coverage ratio X1 of a surface of the toner with silica fine particles is 50.0 area % or more and 75.0 area % or less, and when a theoretical coverage ratio with the silica fine particles is X2, a diffusion index represented by formula 1 satisfies formula 2. diffusion index=X1/X2??(formula 1) diffusion index??0.0042×X1+0.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: May 10, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takehiko Aoyama, Tomohito Taniguchi, Noboru Miyagawa, Taichi Sato, Atsushi Uematsu, Masahiro Watanabe, Yoshitaka Suzumura
  • Patent number: 9201332
    Abstract: A charger to apply a charge to an object is provided. The charger includes an electron emitter including an electroconductive substrate; and a layer of n-type hexagonal boron nitride codoped with magnesium and oxygen atoms, which is located on the electroconductive substrate, wherein the concentration of oxygen atoms in the layer of n-type hexagonal boron nitride codoped with magnesium and oxygen atoms is higher than the concentration of magnesium atoms in the layer.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: December 1, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Satomi Sabu, Shinji Ohtani
  • Patent number: 9182714
    Abstract: A fixing member used for fixing toner includes a base, an elastic layer provided on an outer circumference of the base, and a release layer provided on an outer circumference of the elastic layer. The elastic layer includes silicone rubber, carbon fibers, saturated hydrocarbon having a liquid form at room temperature, and hole portions.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: November 10, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuko Arizumi, Tomoaki Sugawara, Tsuneaki Kondoh, Junichiro Natori
  • Patent number: 9141037
    Abstract: A transfer assist member comprising a plurality of layers, one of the layers being a check film layer comprised of a crosslinked mixture of aminoplast resins, and polyester polyols present on a support polymer layer.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: September 22, 2015
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Kyle B. Tallman, Qi Ying Li, Jonathan H. Herko, Michael S. Roetker, Terry L. Street
  • Patent number: 9129775
    Abstract: The present invention has an object to perform specimen charge measurement or focusing at a high speed and with high precision also for a specimen in which fixed charge and induced charge may be mixedly present. As one mode to achieve the object, there are proposed a specimen potential measuring method and a device to implement the method characterized in that when specimen potential information obtained by a first specimen potential measuring device disposed outside a specimen chamber or specimen potential information beforehand obtained is equal to or more than a predetermined threshold value or is more than the threshold value, measurement of specimen potential is selectively conducted by use of a second specimen potential measuring device in the specimen chamber.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: September 8, 2015
    Assignee: HITACHI HIGH-TECHNOLOGIES CORPORATION
    Inventors: Tatsuaki Ishijima, Osamu Nasu, Muneyuki Fukuda, Takeyoshi Ohashi, Takuji Miyamoto, Kei Sakai
  • Patent number: 9063452
    Abstract: An image forming apparatus includes a charging roller including elastic and surface layers and a photoconductor drum. Initially, the surface layer has a surface roughness Rz of 3-6 ?m, and the layers have an impedance ratio of 0.81 or less in absolute value at a frequency of 800-3000 Hz. After a predetermined time, the surface roughness Rz is reduced by a decrement ?Rz of 0.1-4 ?m. The drum has a film thickness D initially ranging from 20-40 ?m and reduced by a decrement ?D of 5-25 ?m after the predetermined time. Herein, 0.005??Rz/?D?0.8 holds. The impedance ratio is represented as ZE/(ZE+ZS) wherein ZE and ZS represent the respective impedances of the elastic layer and the surface layer, and 100k A4-size recording media recorded with images with an area coverage of 7% are printed in the predetermined time.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: June 23, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takuro Hagiwara, Yoshiki Shimodaira, Yuko Kawase, Satoru Tsuto, Minoru Rokutan, Satoya Sugiura
  • Patent number: 9046826
    Abstract: A belt unit includes rolls being rotatably supported and a belt to be conveyed by the rolls. In a dynamic viscoelasticity test with conditions of tensile load set in a frequency range of 0.01 to 100 [Hz], the belt unit satisfies 1?G10/G70?3.1, and L70?10 [MPa]. A storage elastic modulus of the belt at a temperature of 10[° C.] is indicated by G10. A storage elastic modulus of the belt at a temperature of 70[° C.] is indicated by G70. A loss elastic modulus of the belt at a temperature of 70[° C.] is indicated by L70.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: June 2, 2015
    Assignee: Oki Data Corporation
    Inventor: Michiaki Ito
  • Patent number: 9041953
    Abstract: Disclosed is an image forming apparatus, including: a job input unit; a job execution unit; a job storing unit; a start-up cost calculation unit to calculate a start-up cost which is a cost for start-up of the image forming apparatus, when the job is input from the job input unit; a total sum calculation unit to calculate a total sum of investable amount of the input job and the stored jobs; a job control unit to instruct the job storing unit to store the input job in case that the total sum is less than the start-up cost, and instruct the job execution unit to collectively execute the input job and the stored jobs in case that the total sum is not less than the start-up cost; and a charging unit configured to allocate the start-up cost to the jobs, and charge the allocated start-up cost for each executed job.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: May 26, 2015
    Assignee: KONICA MINOLTA, INC.
    Inventor: Masaki Nakata
  • Publication number: 20150139695
    Abstract: Embodiments pertain to a novel imaging member, namely, an electrostatic latent image generating member, and methods for using the same, that can generate an electrostatic latent image through charge acceptance control and without the need for conventional post charging photo discharge, eliminating process steps and avoiding limitations in system speed due to the transit time of charge carriers after light exposure.
    Type: Application
    Filed: January 29, 2015
    Publication date: May 21, 2015
    Inventors: Gregory McGuire, Yu Liu, Richard A. Klenkler
  • Publication number: 20150016842
    Abstract: A charger to apply a charge to an object is provided. The charger includes an electron emitter including an electroconductive substrate; and a layer of n-type hexagonal boron nitride codoped with magnesium and oxygen atoms, which is located on the electroconductive substrate, wherein the concentration of oxygen atoms in the layer of n-type hexagonal boron nitride codoped with magnesium and oxygen atoms is higher than the concentration of magnesium atoms in the layer.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 15, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Satomi SABU, Shinji OHTANI
  • Patent number: 8934796
    Abstract: An image-forming apparatus includes a first image-forming portion; a second image-forming portion; an executing portion for executing an operation in a first mode in which an image is formed on a recording material by the first and second image-forming portions or a second mode in which an image is formed by the second image-forming portion; an AC-voltage source; a first DC-voltage source; a second DC-voltage source; and a controller for controlling the first and second DC-voltage sources and the AC-voltage source. In the first mode, application of the AC voltage by the AC-voltage source and the DC voltages by the first and second DC-voltage sources are performed, and in the second mode, application of the DC voltage by the second DC-voltage source is performed, and application of the AC voltage by the AC-voltage source and the DC voltage by the first DC-voltage source are stopped.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: January 13, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Ikeda
  • Publication number: 20140376964
    Abstract: An electrophotographic imaging device includes a charging device, a cleaning device, and a fuser member that each include hydrophobic carbon nanotubes. The use of hydrophobic carbon nanotubes can increases the charging device's, the cleaning device's, and the fuser member's durability, conductivity, and contaminants deposition.
    Type: Application
    Filed: September 8, 2014
    Publication date: December 25, 2014
    Inventors: Liang-Bih Lin, David H Pan, Daniel Levy, Jin Wu
  • Patent number: 8903272
    Abstract: An image forming apparatus includes a latent-image forming member including a latent-image carrier and support members disposed at both ends of the latent-image carrier to support the latent-image carrier, a charging member including a discharge electrode that supplies an electric charge to the latent-image carrier and a control electrode that is disposed between the discharge electrode and the latent-image carrier and controls a potential of the latent-image carrier, a first connecting portion and a second connecting portion that are respectively formed on the latent-image forming member and the charging member and that are connected to each other to connect the latent-image forming member and the charging member to each other, and an urging member that is disposed between the latent-image forming member and the charging member to urge them away from each other.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: December 2, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Arichika Tanaka, Kuniaki Tanaka
  • Patent number: 8886065
    Abstract: A reference value of an electric current flowing through each charging member is determined and recorded in a memory unit at a predetermined time by a reference value recording unit. A voltage application unit is caused to start applying a voltage to the charging members upon startup of an image forming apparatus, and a measurement value of an electric current flowing through each charging member is determined by a measurement unit. A charging member of which the measurement value is such that an absolute value of a difference between the reference value and the measurement value is not smaller than a predetermined value is marked by a determination unit. If there is at least one marked charging member and at least one not-marked charging member, a notification produced by a messaging unit is given through a notification unit.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: November 11, 2014
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Kunihiko Kondo
  • Patent number: 8852743
    Abstract: An electro-conductive member for electrophotography, including an electro-conductive mandrel and an electro-conductive layer; and a process cartridge and an electrophotographic apparatus using the same. The layer contains a binder resin having a sulfo or a quaternary ammonium group as an ion exchange group, and an ion opposite in polarity to the ion exchange group. The resin has any one of structures represented by formulas (1)-1 and (1)-2, and any one of structures represented by formulas (2)-1 to (2)-3; and the resin has a molecular structure preventing occurrence of a matrix-domain structure. M represents an integer of 2-20, n represents an integer of 5-50, p represents an integer of 1-25, q represents an integer of 1-15, and r represents an integer of 1-12.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: October 7, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuichi Kikuchi, Kazuhiro Yamauchi, Satoru Nishioka, Norifumi Muranaka, Satoru Yamada, Masahiro Watanabe
  • Patent number: 8824928
    Abstract: A charging apparatus includes a latent image bearing member having a charge generating layer for generating an electric charge by receiving light energy; a light source for emitting light energy for generating the electric charge in the charge generating layer; an electrode; a bias voltage applying portion for applying a bias voltage to the electrode; and an elastic member, which is insulative and transparent, for contacting the electrode to a surface of the latent image bearing member. The electric charge is generated in the charge generating layer by reception of the light energy emitted from the light source, and the surface of the latent image bearing member is electrically charged by applying the bias voltage from the bias voltage applying portion to the electrode. The electrode is provided on the elastic member and is contacted to the surface of the latent image bearing member in a contact area and does not extend to an outside of the contact area.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: September 2, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeshi Kawamura
  • Publication number: 20140219679
    Abstract: There is described an image forming apparatus that includes an imaging member having a charge retentive-surface for developing an electrostatic latent image thereon. The imaging member includes a substrate and photoconductive member disposed on the substrate. The image forming apparatus includes a charging unit for applying an electrostatic charge on the imaging member to a predetermined electric potential wherein the charging unit is spaced from the photoconductive member a distance of from about 3 ?m to about 300 ?m. The image forming apparatus includes a delivery member in contact with the surface of the photoconductive member. The delivery member includes an elastomeric matrix impregnated with a liquid lubricant wherein the delivery member applies a layer of liquid lubricant to the surface of the photoconductor wherein in the layer has a thickness of from about 1 nm to about 15 nm during steady state operation.
    Type: Application
    Filed: February 1, 2013
    Publication date: August 7, 2014
    Applicant: XEROX CORPORATION
    Inventors: Yu Liu, Nan-Xing Hu, Sarah J. Vella
  • Patent number: 8765343
    Abstract: An electrostatic latent image developing toner contains a binder resin, a colorant, europium, and bismuth.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: July 1, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuki Takamiya, Eisuke Iwazaki, Satoshi Yoshida, Satoshi Inoue
  • Patent number: 8755714
    Abstract: A charging member is provided with a surface layer that can not easily wear even due to its contact with a photosensitive member and also has an appropriate elasticity contributing to the formation of an appropriate nip between it and the photosensitive member.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: June 17, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriko Nagamine, Noriaki Kuroda, Yuya Tomomizu
  • Patent number: 8750770
    Abstract: Provided is an image forming method in which a foil image exhibiting excellent finish without any wrinkle and strong adhesive strength is formed on a foil transferring face made of toner. The image forming method for transferring the transfer foil on the foil transferring face is conducted by contacting the transfer foil to the foil transferring face formed by using toner having a glass transition temperature of not more than 60° C., and by passing through a nip portion formed between a driving roller and a follower roller.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: June 10, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Michiyo Fujita, Tatsuya Nagase, Asao Matsushima, Yasuko Uchino, Aya Shirai, Ryuichi Hiramoto
  • Patent number: 8736922
    Abstract: An image reading apparatus includes a reading unit, a controlling unit and a changing unit. The reading unit receives a reflected light from a sheet onto which a light is irradiated from a light source, converts the received light into an image signal, and accumulates a charge corresponding to the image signal in accordance with a reading time of the sheet. The controlling unit controls the light source to be turned off in accordance with a reading mode of the sheet so that an amount of the accumulated charge does not reach a saturated amount. The changing unit changes an amplification factor of an amplifying unit in accordance with a turn-off time of the light source to amplify the image signal to a predetermined level when the controlling unit controls the light source to be turned off. The amplifying unit amplifies the image signal at a predetermined amplification factor.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: May 27, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Kensuke Ohara
  • Patent number: 8731441
    Abstract: A charging roller has a conductive shaft, a charge emission member provided to the shaft, and a gap securing member provided to the shaft. The gap securing member (i) protrudes toward the photoreceptor drum so as to be closer to the photoreceptor drum than the charge emission member is to the photoreceptor drum and (ii) is in contact with the photoreceptor drum so as to secure a gap between the charge emission member and the photoreceptor drum. A conductive part of the gap securing member and the shaft are bonded to each other by electrically releasing adhesive, so that the gap securing member is provided to the shaft.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: May 20, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yasuyuki Ishiguro, Hitoshi Nagahama
  • Patent number: 8715830
    Abstract: To provide an electrically conducting member for electrophotography which can not easily come to change in electrical resistance value even upon application of direct current and also has made any ion conducting agent kept from bleeding. The electrically conducting member has an electrically conducting substrate and an electrically conducting layer; the electrically conducting layer containing an epichlorohydrin rubber having in the molecular structure at least an alkylene oxide (AO) unit, an epichlorohydrin (ECH) unit and a unit having a sulfonate ion; the AO unit being at least one unit of an ethylene oxide unit, a propylene oxide unit and a butylene oxide unit; and the AO unit(s) in the rubber being in a content of 5 to 60% by mass in total and the ECH unit in the rubber being in a content of 30% by mass or more.
    Type: Grant
    Filed: June 13, 2013
    Date of Patent: May 6, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoru Yamada, Norifumi Muranaka, Kazuhiro Yamauchi, Satoru Nishioka
  • Patent number: 8718505
    Abstract: The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: May 6, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
  • Patent number: 8706007
    Abstract: An image forming apparatus includes a positively-charged single layer type electrophotographic photoreceptor, a charging device with a contact charging roller for charging a surface of the photoreceptor and an exposure device for exposing the charged surface of the photoreceptor to light to form an electrostatic latent image thereon. A developing device develops the electrostatic latent image into a toner image and a transfer device transfers the toner image to a transferred body. The charging roller is made of electrically conductive rubber having an Asker-C rubber hardness of 62 to 81°. A roller surface roughness of the charging roller has an average distance (Sm) between asperity peaks on a cross-sectional curve of 55 to 130 ?m and that a ten-point average roughness (Rz) is 9 to 19 ?m. The image forming apparatus is capable of preventing carrier trapping, film peeling and uneven charging in the photoreceptor.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: April 22, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Shinki Miyaji, Masaki Kadota, Yoshitaka Imanaka, Hiroka Itani, Masahito Ishino
  • Patent number: 8682186
    Abstract: An image forming device has: an image forming body on which an image is formed in a state in which the image forming body is charged; a charging device having plural discharge portions, and charging the image forming body by discharging of plural discharge portions; and a control section that, when forming the image on the image forming body, operates the plural discharge portions, and when not forming the image on the image forming body, switches between a state of operating some of the plural discharge portions and decreasing output of or stopping the discharge portions other than the some discharge portions, and a state of operating some other of the plural discharge portions and decreasing output of or stopping the discharge portions other than the some other discharge portions.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: March 25, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Tomoya Ichikawa, Akiko Kimura
  • Publication number: 20140079437
    Abstract: An image forming apparatus employing an illuminator configured to irradiate light to a photosensitive body to change a level of electrical potential of the photosensitive body. The illuminator includes at least one light source configured to generate light and a light guide configured to guide the light received from the light source toward the photosensitive body. The light guide includes at least one incidence face and an emission face. The at least one incidence face faces the light source in a main scanning direction to receive the light from the light source into the light guide. The light exits from the light guide through the emission face toward the photosensitive body. The emission face includes a diffusion pattern having a plurality of semi-cylindrical structures along a width direction of the light guide. A radius of curvature of the semi-cylindrical structures increases away from the at least one light source.
    Type: Application
    Filed: November 22, 2013
    Publication date: March 20, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Kyung Rok KIM
  • Patent number: 8668987
    Abstract: The present invention provides an electrophotographic electrically conductive member in which conductivity needed for a charging member is secured, and defects in an image attributed to uneven discharging can be minimized independently of a long-term use and an environment of use. An electrophotographic electrically conductive member comprising an electrically conductive support and an electrically conductive layer, wherein the electrically conductive layer includes an ion conductive resin having a quaternary ammonium ion in a molecule structure as a binder resin, and a carrier molecule represented by the following formula (1) or (2): (wherein n1 and n2 each independently represent an integer of 1 to 4).
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: March 11, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Yamauchi, Norifumi Muranaka, Satoru Nishioka, Yuichi Kikuchi
  • Patent number: 8642148
    Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): (CH2)m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: February 4, 2014
    Assignee: Bridgestone Corporation
    Inventors: Izumi Egashira, Hirotaka Tagawa, Junichi Takano, Daijirou Sirakura
  • Patent number: 8644731
    Abstract: A charging device includes a charger facing a rotatably supported image carrier and configured to charge the image carrier on which an electrostatic latent image is to be formed, and a movement mechanism configured to move the charger between a charging position at which the charger is close to the image carrier and a retracted position at which the charger is retracted away from the image carrier. The movement mechanism includes a support member supporting the charger that has been moved to the retracted position by the movement mechanism, and a movable member configured to move when a driving force from a drive source is transmitted thereto. The movable member moves to the charging position or the retracted position when the movable member is moved in a direction of a rotational axis of the image carrier while being in contact with the support member.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: February 4, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Kuniaki Tanaka
  • Patent number: 8643910
    Abstract: An image forming apparatus includes an acquiring unit that acquires image data expressing an image region included in an image with a first value and a background region included in the image with a second value; a segmenting unit that segments the image region into multiple segments arranged in a fast scanning direction; a converting unit that converts a value of at least one of the segments into the second value; an output unit that generates an image signal on the basis of the image data and outputs the image signal; an exposure unit that exposes a charged image bearing member to light according to the output image signal by scanning the light thereto in the fast scanning direction so as to form a latent image; and a developing unit that forms the image by developing the latent image using an invisible toner that absorbs infrared light or ultraviolet light.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: February 4, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Junichi Ichikawa
  • Patent number: 8628854
    Abstract: To suppress an excessive reduction in resistance of an electro-conductive roller under an H/H environment and reduce a resistance value thereof under an L/L environment, provided is an electro-conductive member for electrophotography, comprising: an electro-conductive mandrel; and an electro-conductive layer provided on a periphery of the mandrel, wherein the electro-conductive layer contains a binder resin having an alkylene oxide structure, and a sulfo or a quaternary ammonium group as an ion exchange group, and an ion having polarity opposite to polarity of the ion exchange group, a water content of the electro-conductive layer under a temperature of 30° C. and a relative humidity of 80% is 10 mass % or less, and a spin-spin relaxation time of the electro-conductive layer, which is determined by pulse NMR measurement with a hydrogen core being a measurement core under a temperature of 15° C. and a relative humidity of 10%, is 200 ?sec or more.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: January 14, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Yamauchi, Satoru Nishioka, Masahiro Watanabe, Yuichi Kikuchi, Satoru Yamada, Norifumi Muranaka
  • Patent number: 8620187
    Abstract: Various embodiments provide materials and methods for bias charging members including an outer surface coating overlaying an outer base layer, wherein the outer surface coating can include conductive fillers combined with one or more polymers to provide desirable surface, electrical, and/or mechanical properties.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: December 31, 2013
    Assignee: Xerox Corporation
    Inventors: Brian P. Gilmartin, Jin Wu, April M. Mattox, Aaron M. Stuckey
  • Patent number: 8620184
    Abstract: An image forming apparatus has: a positively-charged single layer type electrophotographic photoreceptor; a charging device with a contact charging roller for charging a surface of the photoreceptor; an exposure device for exposing the charged surface to light to form an electrostatic latent image on the surface of the photoreceptor; a developing device for developing the electrostatic latent image into a toner image; and a transfer device for transferring the toner image to a transferred body. The photoreceptor has a conductive substrate and a photosensitive layer that contains a charge generating agent, a charge transport agent and a binder resin. The binder resin has a yield point strain of 9 to 29%, and the contact charging roller has a conductive layer with a thickness of 1 mm to 3 mm. The image forming apparatus is environmentally responsive and having a long-lasting positively-charged single layer type photoreceptor and charging roller.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: December 31, 2013
    Assignee: Kyocera Mita Corporation
    Inventors: Shinki Miyaji, Masaki Kadota, Masahito Ishino, Yoshitaka Imanaka, Hiroka Itani
  • Patent number: 8594521
    Abstract: An image forming apparatus including: a plurality of photosensitive drums; a plurality of scorotron chargers provided for the plurality of photosensitive drums, respectively, a voltage application circuit commonly connected to the plurality of scorotron chargers, a plurality of wires provided for the plurality of scorotron chargers, respectively; a plurality of grid electrodes provided for the plurality of scorotron chargers, respectively; at least one of current detecting units provided for at least one of the plurality of grid electrodes, respectively, and at least one of the current detecting units detecting grid current which flows into at least one of the grid electrodes, respectively; and a control device configured to control the voltage application circuit such that at least one of the grid currents detected by at least one of the current detecting units become equal to or higher than a reference value.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: November 26, 2013
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Tsuyoshi Maruyama, Masahito Hamaya, Katsumi Inukai
  • Patent number: 8588652
    Abstract: A charged particle generator includes a first electrode, a second electrode, and an insulating material that is provided between the first electrode and the second electrode. The second electrode has an opening that opens in a first direction in which the first electrode, the insulating material, and the second electrode are arranged. The insulating material has a region limiting space. The region limiting space corresponds to the opening. The region limiting space is continuous with the opening. The region limiting space is a space that opens in a direction in which the region limiting space is oriented toward the opening and that is limited in a second direction perpendicular to the first direction. The first electrode has an anisotropic resistance portion in which a resistance component in the first direction is smaller than a resistance component in the second direction.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: November 19, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masao Ohmori, Takanori Morino, Chikaho Ikeda
  • Patent number: 8583011
    Abstract: An image forming apparatus includes a positively-charged single layer type electrophotographic photoreceptor, a charging device with a contact charging roller for charging a surface of the photoreceptor and an exposure device for exposing the charged surface of the photoreceptor to light to form an electrostatic latent image thereon. A developing device develops the electrostatic latent image into a toner image and a transfer device transfers the toner image to a transferred body. The charging roller is made of electrically conductive rubber having an Asker-C rubber hardness of 62 to 81°. A roller surface roughness of the charging roller has an average distance (Sm) between asperity peaks on a cross-sectional curve of 55 to 130 ?m and that a ten-point average roughness (Rz) is 9 to 19 ?m. The image forming apparatus is capable of preventing carrier trapping, film peeling and uneven charging in the photoreceptor.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: November 12, 2013
    Assignee: Kyocera Mita Corporation
    Inventors: Shinki Miyaji, Masaki Kadota, Yoshitaka Imanaka, Hiroka Itani, Masahito Ishino
  • Patent number: 8577262
    Abstract: A charging device includes: a first electrode; a second electrode; an insulating body that is provided between the first electrode and the second electrode; wherein either the first electrode or the second electrode includes an opening portion that is formed so as to open toward a first direction in which the first electrode, the insulating body, and the second electrode are laminated, and the insulating body includes a region limiting portion which is a space that communicates with the opening portion, and opens toward a direction in which the region limiting portion communicates with the opening portion, and is limited in a second direction vertical to the first direction.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: November 5, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masao Ohmori, Hidehiko Yamaguchi, Takanori Morino
  • Patent number: 8565648
    Abstract: A charge element includes an element body in parallel to a photoreceptor element and biased to the photoreceptor element by an elastic element, and a gap retainer unit provided on the element body, contacting with an outer face of the photoreceptor element to constantly retain a gap between an outer face of the element body and the outer face of the photoreceptor element, and comprising a first gap retainer element provided on the element body and a second gap retainer element provided on the first gap retainer element and made of a material softer than that of the first gap retainer element and that of the outer face of the photoreceptor element.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: October 22, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroki Furubayashi, Tadayuki Oshima