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| Number | Title | Issue Date |
| 8107839 | Image forming apparatus with bias applying device for applying a charging bias to a charging roller and with a bias corrector A bias corrector conducts a first bias correction calculation by performing first through third calculations. The first calculation compares a stored target charging current value to a first charging current value detected when a first charging bias was applied by a... | 01/31/2012 |
| 8103181 | Image forming apparatus and method of adjusting charge bias An image forming apparatus includes an image carrier configured to carry an image and a charger to which a direct current voltage overlapped with an AC voltage is applied as a charging bias to charge the image carrier. The charger is positioned in contact or contact... | 01/24/2012 |
| 8050581 | Image forming apparatus and control method thereof An image forming apparatus and a control method thereof are disclosed. A charge unit charges a surface of an organic photo conductor (OPC) to a predetermined electric potential. A developing unit develops an electrostatic latent image formed on the surface of the OP... | 11/01/2011 |
| 8023845 | Image forming apparatus with a control unit that controls a charging bias voltage An image forming apparatus includes a movable image bearing member; charging means for electrically charging the image bearing member; voltage applying means for applying to the charging means an oscillating voltage including an oscillating component and a constant ... | 09/20/2011 |
| 8005380 | Image forming apparatus An image forming apparatus includes a photosensitive member; a charging device; an exposure device device; a developing device; a transfer charger; a pre-exposure device; a current detector; a calculating device; and a correcting device. The calculating device deter... | 08/23/2011 |
| 7991311 | Image forming apparatus and method for controlling developing bias voltage The present invention provides a method and apparatus for forming an image. A controller manages a charger and a developing bias voltage to increase an absolute value of the charging voltage to an image-bearing member and an absolute value of a developing bias volta... | 08/02/2011 |
| 7991312 | Image forming apparatus for controlling a potential of an image bearing member An image forming apparatus includes a charging device, an image bearing member, an electrostatic image forming device, a development device including a developer bearing member, a transfer device, and a controller. The controller controls a potential of the image be... | 08/02/2011 |
| 7970303 | Image forming apparatus An image forming apparatus includes: an image bearing body on which surface a solid lubricant is supplied, forming and bearing an image on the surface; a charging member to which a voltage is applied, being in contact with the image bearing body to impart a charge; ... | 06/28/2011 |
| 7885561 | Electric charging device, image forming apparatus, electric charging method, and manufacturing method of electric charging device A needle electrode having a pointed section is provided so as to face a charge-target object, and a voltage to be applied to the needle electrode is set so that 2≦(E2·S2)/(E1·S1)≦5 is satisfied, where an ionization area A1 in... | 02/08/2011 |
| 7873291 | Image forming apparatus and process cartridge including charging bias adjustment control An image forming apparatus includes an image bearing member, a charging device to apply a charging bias, a developing device to develop a latent electrostatic image with toner, a transfer device to transfer the toner image to a recording medium, a fixing device to f... | 01/18/2011 |
| 7869725 | Method and device for measuring surface potential distribution, method and device for measuring insulation resistance, electrostatic latent image measurement device, and charging device A surface potential distribution measurement method and device including setting a sample having a surface with a surface potential distribution in a sample installation unit wherein both an electric field intensity formed on the sample surface and a potential bias ... | 01/11/2011 |
| 7865097 | Image forming apparatus and control method The present invention provides an image forming apparatus comprising an image forming unit configured to form an image on an image carrier, a transfer unit configured to transfer the image formed on the image carrier onto a transfer medium, a voltage applying unit c... | 01/04/2011 |
| 7856188 | Developing method in imaging-forming device A developing method in an image-forming device is provided. The developing method includes the steps of charging a photoreceptor; exposing the photoreceptor to form a first latent image on the photoreceptor; developing the first latent image by a first developing un... | 12/21/2010 |
| 7835655 | Charger, image forming apparatus, and charge control method A charger includes: a first charging member that contacts an image carrier and a second charging member that contacts the image carrier downstream from the first charging member. At the time of image formation, a voltage higher than the discharge start voltage of th... | 11/16/2010 |
| 7831162 | Image forming apparatus with surface potential adjustment based on idle time The present invention is an image forming apparatus containing an image holding body, a developer holding body for holding developer that forms a developer image by being affixed to the electrostatic latent image formed on the image holding body, a transfer unit for... | 11/09/2010 |
| 7805089 | Image forming apparatus An image forming apparatus performs a control sequence in which an AC voltage having a peak-to-peak voltage is applied to a charging member so that a relationship between an absolute value of a surface potential of an image bearing member at a portion under a transf... | 09/28/2010 |
| 7796903 | Charging apparatus with a discharge electrode having a plurality of sharp-pointed portions A charging apparatus which is excellent in charging uniformity and thus allows a to-be-charged body to be charged uniformly and in which the generation of discharge products can be reduced, is provided. In the charging apparatus, ions are generated under the differe... | 09/14/2010 |
| 7792443 | Image forming apparatus controlling the voltage applied to the developing member An image forming apparatus includes: an image carrier; a charging member; a developing member; a supplying member; an electrostatic removing unit; a developing member voltage application unit applying a voltage to the developing member; a supplying member voltage ap... | 09/07/2010 |
| 7778560 | Image forming apparatus and method of adjusting charge bias An image forming apparatus includes an image carrier configured to carry an image and a charger to which a direct current voltage overlapped with an AC voltage is applied as a charging bias to charge the image carrier. The charger is positioned in contact or contact... | 08/17/2010 |
| 7778561 | Charging device for charging charge receiving material, image forming apparatus including the same, control method of the charging device and computer-readable storage medium recording control program for the charging device In a charging device of the present invention, with reference to a state (movement speed of a charging receiving material, operating period of charging device) in which the charging device is used which state is obtained by an image formation controlling section, a ... | 08/17/2010 |
| 7773900 | Image forming apparatus and controlling feature for deviating toner stripes transferred to an intermediate transfer medium The image forming apparatus includes image forming parts, a developing device and a cleaner to clean at least the intermediate transfer material or the transfer device, wherein at the image forming operation starting time, in each image forming part, after starting ... | 08/10/2010 |
| 7756431 | Image formation apparatus with controlled discharge current An image formation apparatus that includes a photoconductor, a charging section that applies a bias voltage having an AC voltage superposed on a DC voltage and charges the photoconductor, a controller that controls at least one of the AC voltage and an AC current ap... | 07/13/2010 |
| 7756430 | Apparatus and method for charging an imaging member A method of charging an imaging member having an outer surface with an imaging region and a seam region. A charge device is provided adjacent the imaging member. An electrical charge is provided to the imaging region of the imaging member using a voltage on the char... | 07/13/2010 |
| 7751737 | Image forming apparatus which corrects charge potential on an image carrier An image forming apparatus is provided in which on-surface potential unevenness of an image carrier can be suppressed, and with which an output image having excellent on-surface uniformity of color or the like can be obtained. The image forming apparatus includes: a... | 07/06/2010 |
| 7738803 | Image forming method and apparatus for effectively charging an image carrier An image forming apparatus, performing a corresponding method of image forming, includes an image carrier, a writing unit, a developing unit, a charging member configured to rotate continuously with the image carrier at a portion contacting the image carrier and uni... | 06/15/2010 |
| 7734204 | System and methods for reducing ghosting The presently disclosed embodiments are directed to imaging members useful in electrostatography. More particularly, the embodiments pertain to an improved development systems for electrophotographic imaging and printing apparatuses and machines in which ghosting pr... | 06/08/2010 |
| 7715743 | Charger with a probe and controller This is a charging assembly that is useful in marking processes with an electrostatically charged surface. The assembly includes, besides the charger, a controller and an electric field probe. Charge and current flows can be detected by the probe and corrected immed... | 05/11/2010 |
| 7715742 | Photoconductor life through active control of charger settings Xerographic photoreceptor life is improved while maintaining output print quality by adjusting the AC charging actuator of a xerographic machine to a point at which photoconductor life is optimized while maintaining output print quality. Where the actuator is voltag... | 05/11/2010 |
| 7711278 | Image forming apparatus In an image forming apparatus in which a DC bias is applied to charge a photosensitive drum, when a charge eliminating device is in deterioration or failure, there are some cases where a proper charging is not made, and thus poor imaging occurs. A DC bias is applied... | 05/04/2010 |
| 7711279 | Image forming apparatus with a predetermined potential difference between regions of an image bearing member An image forming apparatus includes a rotatable image bearing member on which an electrostatic latent image is formed; a charging member for being supplied with a charging voltage which is a DC voltage not having an AC voltage component and for contacting the bearin... | 05/04/2010 |
| 7684719 | Charging apparatus and image forming apparatus An image forming apparatus includes an image bearing member; a charging member for electrically charging the image bearing member through electric discharge by applying, to the charging member, a DC voltage biased with an AC voltage; and voltage condition determinat... | 03/23/2010 |
| 7657197 | Image forming apparatus employing a cleaner-less system An image forming apparatus performs a control sequence in which an AC voltage having a peak-to-peak voltage is applied to a charging member so that a relationship between an absolute value of a surface potential of an image bearing member at a portion under a transf... | 02/02/2010 |
| 7643765 | Image forming apparatus that charges the surface of a photosensitive member to a predetermined potential An image forming apparatus charges the surface of a photosensitive member to a predetermined potential. A current detector detects a charging current when the charging bias is applied. A storage stores a target charging current value when the photosensitive member i... | 01/05/2010 |
| 7639960 | Charger, image forming apparatus, and charge control method A charger includes: a charging brush which is rotatably provided and is brought into contact with an image carrier to charge the surface of the image carrier; a charging roller which is brought into contact with the image carrier at a portion on the downstream side ... | 12/29/2009 |
| 7630659 | Method and apparatus for image forming capable of effectively performing a charging process A method and an apparatus of controlling a charge voltage including the steps of applying, charging, detecting, and determining. The applying step applies an application voltage having a direct-current voltage and an alternating-current voltage superimposed onto the... | 12/08/2009 |
| 7596331 | Image forming apparatus An image forming apparatus includes an auxiliary charging member contacting an image bearing member and for being supplied with a bias of an identical polarity to a normal charge polarity of toner at a position downstream from a transfer portion where a transfer mem... | 09/29/2009 |
| 7590365 | Image forming apparatus with charging bias correcting portion for correcting a charging bias of a charging roller An image forming apparatus uses a charging roller to charge the surface of a photosensitive member to a predetermined potential. A current detector detects charging current when the charging bias is applied. A bias corrector corrects the charging bias and a storage ... | 09/15/2009 |
| 7542689 | Charging device, image forming apparatus, computer readable medium storing charging control program and method for charging control A charging device includes a charging member that charges a body to be charged; a detector that detects an AC component of a current flowing through the charging member; an integration section that integrates the AC component of the current detected by the detector;... | 06/02/2009 |
| 7532831 | Image formation apparatus provided with photoconductor and charging device An image formation apparatus is provided and includes: a photoconductor; a charging section that applies a bias voltage having an AC voltage superposed on a DC voltage to the photoconductor so as to charge the photoconductor; a controller that controls at least one ... | 05/12/2009 |
| 7532832 | Image forming apparatus and charge control method An image forming apparatus includes a photoreceptor having on a surface thereof a photosensitive layer, in which an electrostatic latent image is formed, a contact charging roll applied with a bias containing a direct current component having superimposed thereon an... | 05/12/2009 |
