GB1481013A - Electrostatographic charging system - Google Patents

Electrostatographic charging system

Info

Publication number
GB1481013A
GB1481013A GB2370674A GB2370674A GB1481013A GB 1481013 A GB1481013 A GB 1481013A GB 2370674 A GB2370674 A GB 2370674A GB 2370674 A GB2370674 A GB 2370674A GB 1481013 A GB1481013 A GB 1481013A
Authority
GB
United Kingdom
Prior art keywords
receptor
photo
drum
current
charging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2370674A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to GB2370674A priority Critical patent/GB1481013A/en
Publication of GB1481013A publication Critical patent/GB1481013A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0266—Arrangements for controlling the amount of charge
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

1481013 Automatic control of electrostatic charging XEROX CORP 29 May 1974 23706/74 Heading G3R The electrostatic charge applied to a movable photo-receptor surface in a copying machine is controlled by regulating either the current received by the photo-receptor, or a current which is arranged to be equal to the photo-receptor current. As shown in Fig. 1, a coronode wire 12 with an earthed shield 13 is connected to a power supply 10 and produces a corona discharge which charges the surface of a photo-receptor drum 14. Current flows from the drum by way of slip rings 15 to a comparator 16 which receives a reference signal and produces a control signal for the power supply 10 to keep the current at the desired value. In an alternative embodiment, Fig. 2 (not shown), current flowing to the comparator 16 from the shield 13 and the supply is regulated, while the photo-receptor 14 is earthed. A device may be included for measuring the residual voltage on the drum 14 and inhibiting the charging process if the measured voltage exceeds say 10 volts. A further sensor may be used to prevent charging if illumination used to discharge the drum surface is not present. Two or more coronodes may be used for charging the drum.
GB2370674A 1974-05-29 1974-05-29 Electrostatographic charging system Expired GB1481013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2370674A GB1481013A (en) 1974-05-29 1974-05-29 Electrostatographic charging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2370674A GB1481013A (en) 1974-05-29 1974-05-29 Electrostatographic charging system

Publications (1)

Publication Number Publication Date
GB1481013A true GB1481013A (en) 1977-07-27

Family

ID=10199976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2370674A Expired GB1481013A (en) 1974-05-29 1974-05-29 Electrostatographic charging system

Country Status (1)

Country Link
GB (1) GB1481013A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644908A1 (en) * 1989-03-23 1990-09-28 Toshiba Kk APPARATUS FOR ADJUSTING THE OUTPUT VALUE OF CHARGING DEVICES FOR USE IN AN IMAGE FORMING APPARATUS
EP0758104A1 (en) * 1995-08-08 1997-02-12 Sharp Kabushiki Kaisha Charging device and design method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644908A1 (en) * 1989-03-23 1990-09-28 Toshiba Kk APPARATUS FOR ADJUSTING THE OUTPUT VALUE OF CHARGING DEVICES FOR USE IN AN IMAGE FORMING APPARATUS
EP0758104A1 (en) * 1995-08-08 1997-02-12 Sharp Kabushiki Kaisha Charging device and design method thereof
US5796103A (en) * 1995-08-08 1998-08-18 Sharp Kabushiki Kaisha Charging device and design method thereof
EP1164439A2 (en) * 1995-08-08 2001-12-19 Sharp Kabushiki Kaisha Charging device and design method thereof
EP1164439A3 (en) * 1995-08-08 2004-12-15 Sharp Kabushiki Kaisha Charging device having a plurality of discharging tips

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920529