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| Number | Title | Issue Date |
| 8099011 | Image forming apparatus Embodiments of the present invention include an image bearing member arranged to bear an electrostatic latent image, a charging member contacting the image bearing member to charge a surface of the image bearing member with application of a DC voltage to the chargin... | 01/17/2012 |
| 8055149 | Charging device for using scorotron charging mechanism and image forming device comprising the charging device A charging device is provided. The charging device includes a shield, a discharging part disposed inside the shield, a grid formed at an open end of the shield. The charging device further includes a power supply unit supplying charging power while maintaining the v... | 11/08/2011 |
| 7945183 | Image forming device An image forming device includes: a high voltage generating circuit for applying an oscillating voltage to a charging member disposed in contact with or proximity to an image carrier, the oscillating voltage having a DC voltage Vdc and an AC voltage Vac superimposed... | 05/17/2011 |
| 7903993 | Image forming apparatus An image forming apparatus capable of maintaining cleaning performance of a cleaning brush and downsizing the apparatus main body. Transfer residual toner accumulated on the cleaning brush is transferred onto a photoreceptor by an electrostatic force, hence the clea... | 03/08/2011 |
| 7899352 | Image forming apparatus An aspect of the invention provides a charging control device of a color image forming apparatus, and the charging control device can properly control a charging potential of an image bearing body such that fog and uneven density are not generated even in a low-temp... | 03/01/2011 |
| 7809302 | Charging device and image forming apparatus using the same A charging apparatus includes a charging member to charge a surface of a photoconductive medium, a power unit to supply an electric power as a bias voltage to the charging member, and a resistor unit to reduce a ripple on the surface of the charging member. Accordin... | 10/05/2010 |
| 7783224 | Image forming apparatus to adjust a supplied charge to improve printing quality and image forming method thereof An image forming apparatus includes a photosensitive body to be developed by a conductive toner, a charger which charges a surface of the photosensitive body with a surface potential, a power supply which supplies one of a normal charging power to perform a normal c... | 08/24/2010 |
| 7447461 | Method for charging a photoreceptor to extend the life of a charge receptor in a xerographic printer A method of operating an electrostatographic printing apparatus, the apparatus including a charge-retentive member defining an imaging surface and a charging device for placing a charge on the imaging surface, including the steps of: providing a power supply to appl... | 11/04/2008 |
| 7437089 | Image forming device having an alternating current frequency regulating apparatus The size of a resonance noise due to a signal of an alternating voltage applied to a charging member (charging roller) is detected by a piezoelectric device (PZ), and in cases in which the size of the detected resonance noise (detection signal level) exceeds a prede... | 10/14/2008 |
| 7403741 | Exhaust system of image forming device A low-voltage power source circuit board is provided downstream in relation to the flow of air introduced through an intake hole and exhausted by a power source fan. Heat sinks are provided on the low-voltage power source circuit board on electronic parts that gener... | 07/22/2008 |
| 7398405 | Output system, printing system, printing device management device and printing device, print instruction program, printing device management program and printing device control program, and printing method An output system having an output device that performs output based on output data so that the output device performs the output after having acquired authentication. In the system, an operating state controlling unit outputs a power-save-cancel command for causing ... | 07/08/2008 |
| 7369788 | Image forming apparatus having high voltage circuit board and driving unit An image forming apparatus (1) according to the present invention includes a high voltage circuit board (14) and a driving unit (10). A frame (4B) is provided in the apparatus (1) to support an image forming unit (2). The fr... | 05/06/2008 |
| 7324776 | Image forming apparatus, charge controlling apparatus, and image forming method A color printer including, a conductive brush roller to contact a photosensitive drum at a position downstream of a transferring apparatus and upstream of a charging apparatus, wherein at least part of residual toner is collected after temporarily transferring on th... | 01/29/2008 |
| 7324772 | Point-of-load design for high voltage AC power supplies An electrophotographic document production device having a transformerless high voltage power supply located distal to its load and a transformer at the point of load. ... | 01/29/2008 |
| 7302200 | Image forming apparatus An image forming apparatus of the present invention includes a pair of support plates supporting the rotary shaft of a photoconductive drum at axially opposite ends of the drum. One of the support plates is openable away from the body of the apparatus and loaded wit... | 11/27/2007 |
| 7288924 | Digital input current control for switch mode power supplies A method and apparatus for digitally controlling the average input current of a switch mode power supply are disclosed. In preferred embodiments, the switch mode power supplies are DC-DC converters. One aspect of the invention relates to a method for controlling the... | 10/30/2007 |
| 7260340 | System and method for transfer of an electrical voltage to/from a rotating roller In order to be able to supply a rotating transfer roller in a transfer printing station of an electrophotographic printing device with a high voltage, a system and method is proposed that comprises a voltage transfer device with an elastically borne brush, a compens... | 08/21/2007 |
| 7239823 | Electrophotographic image forming apparatus, process cartridge and discharge preventing mechanism An electrophotographic image forming apparatus on which a process cartridge is detachably mountable forms an image on a recording medium, and has a main body electrical contact electrically connected to a cartridge electrical contact when the cartridge is mounted on... | 07/03/2007 |
| 7224920 | Sheet processing apparatus and control method thereof In a sheet processing apparatus, which is connected to an image forming apparatus, applies a predetermined process to a plurality of sheets that have undergone image formation as a unit, and has power storage means capable of storing electric power required to execu... | 05/29/2007 |
| 7215901 | Process cartridge and electrophotographic image forming apparatus A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The main assembly includes an output contact movable between electrical connecting and retracted positions, a displaceable member for moving the output ... | 05/08/2007 |
| 7215908 | Non-contact bias charge roll biased with burst modulation waveform A method of operating an electrostatographic printing apparatus, the apparatus including a charge-retentive member defining an imaging surface and a charging device for placing a charge on the imaging surface, a gap existing between the imaging surface and the charg... | 05/08/2007 |
| 7190917 | Image forming apparatus with divided output of DC high voltage source An output of a DC high voltage source is supplied as a bias to a heat fixing apparatus. An output of the DC high voltage source is divided by resistors, and a divided output is supplied as a DC bias to a charging apparatus. A feedback circuit generates a feedback si... | 03/13/2007 |
| 7173720 | Image forming apparatus with power saving characteristics An image forming device that uses a power transformer (T) such that no action delay and performance degradation/malfunction occur even in a power save mode, thereby achieving high energy efficiency. Circuits (2, 3, 4) of the image forming device are divided i... | 02/06/2007 |
| 7158245 | Printer and power save control method for the same Disclosed is a printer which performs efficient power save control by keeping track of the condition of each client of the printer without having to send wasteful packets, that is, without affecting the network environment. The printer includes: a unit for monitorin... | 01/02/2007 |
| 7149447 | Image forming device having an electrifying member in contact with an image carrier An image forming device is provided that is capable of easily preventing occurrence of stripe-like image noise that may be caused by intimate contact between a contact electrifying member and an image carrier even when an image forming operation is stopped for a whi... | 12/12/2006 |
| 7139501 | Charge voltage control circuit and image forming apparatus which controls a charge voltage based on a discharge current An image forming apparatus includes a control voltage generation circuit which inputs a primary AC voltage to the primary side of a voltage transformer, generates a control voltage corresponding to a current generated on the secondary side of the voltage transformer... | 11/21/2006 |
| 7130557 | Process cartridge and electrographic image forming apparatus A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The main assembly includes an output contact movable between electrical connecting and retracted positions, a displaceable member for moving the output ... | 10/31/2006 |
| 7058333 | Color image forming apparatus A color image forming apparatus which, in a sequential order for each of plural colors of a composite color image, charges plural photosensitive bodies, exposes electrostatic latent images on the plural photosensitive bodies, develops latent images on the photosensi... | 06/06/2006 |
| 7054574 | Method for charging a photoreceptor to extend the life of a charge receptor in a xerographic printer A method of operating an electrostatographic printing apparatus, the apparatus including a charge-retentive member defining an imaging surface and a charging device for placing a charge on the imaging surface, including the steps of: providing a power supply to appl... | 05/30/2006 |
| 7050732 | Electrophotographic image-forming apparatus and charging voltage control method thereof An electrophotographic image-forming apparatus and a charging voltage control method therefor. The electrophotographic image-forming apparatus has a charging roller applying a predetermined voltage to a photosensitive medium, a developing roller for developing with ... | 05/23/2006 |
| 7022445 | Imaging member A charge transport layer for an imaging member comprising a charge transport layer wherein the charge transport layer is coated in two passes and wherein the second pass comprises the application of a charge transport component and a hindered phenol covalently bonde... | 04/04/2006 |
| 7024125 | Charging device and image forming apparatus The present invention is a charging device that electrically charges an object that is charged while being moved in a predetermined direction and an image forming device having such a charging device. The charging device has: a charging member that electrically char... | 04/04/2006 |
| 6954600 | Electric contact member applying voltage to charger, process cartridge, and image forming apparatus The present invention relates to an electric contact member applying a voltage from a voltage applying device to a charger reciprocally moving in a longitudinal direction of an image carrier. The member includes a securing portion electrically connected to a side of... | 10/11/2005 |
| 6933089 | Imaging member A charge transport layer for an imaging member comprising a dual charge transport layer and wherein the charge transport layers comprise a photogenerating layer; (1) a first charge transport layer comprised of a charge transport component and a resin binder; and the... | 08/23/2005 |
| 6920297 | Image forming apparatus that cleans a wire of a charger An image forming apparatus wherein a wire of a charger is cleaned while a process unit is attached to or removed from a casing. A cleaning unit pinches the wire of the charger therein slidably, and reciprocates to clean the wire when the process unit is attached to ... | 07/19/2005 |
| 6845222 | IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS FOR SUPPRESSING MOVEMENT OF DEVELOPER ONTO THE ELECTROSTATIC LATENT IMAGE CARRIER WHEN THE VOLTAGES APPLIED TO THE CHARGING AND DEVELOPING DEVICES ARE RAISED OR LOWERED An electrophotographic image forming apparatus having a photosensitive member 1, a charging roller 2 and a developing roller 31, and including an output variable power source 8 common to the charging and the developing rollers 2 an... | 01/18/2005 |
| 6842591 | Method of controlling charging potential of conductive roller in printer and apparatus therefor A method of controlling a charging potential of an organic photoconductive cell (OPC) includes a first operation of applying two charging voltages Vc1 and Vc2 having respective duties D1 and D2 established in an engine controller unit (EC... | 01/11/2005 |
| 6842594 | Intermittent DC bias charge roll AC cleaning cycle An apparatus for applying an electrical charge to a charge retentive surface, wherein a bias charge roll member is situated proximately to a surface to be charged such as, a photoreceptor. The bias contact roll member is supplied with an electrical bias including an... | 01/11/2005 |
| 6807389 | Bias charge roller with optimally induced AC corona An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of a member to be charged such as a photoreceptor. The bias charge roll member is supplied wit... | 10/19/2004 |
| 6763207 | Intermittent DC bias charge roll with DC offset voltage An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of member to be charged such as a photoreceptor. The bias charge roll member is supplied with ... | 07/13/2004 |
