GB1467935A - Corona current measurement and control arrangement - Google Patents

Corona current measurement and control arrangement

Info

Publication number
GB1467935A
GB1467935A GB2204475A GB2204475A GB1467935A GB 1467935 A GB1467935 A GB 1467935A GB 2204475 A GB2204475 A GB 2204475A GB 2204475 A GB2204475 A GB 2204475A GB 1467935 A GB1467935 A GB 1467935A
Authority
GB
United Kingdom
Prior art keywords
voltage
bridge
measuring
discharge
prior
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
GB2204475A
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
Publication of GB1467935A publication Critical patent/GB1467935A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24—Arrangements for measuring quantities 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
    • G03G15/0266—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)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Elimination Of Static Electricity (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

1467935 Measuring current XEROX CORP 22 May 1975 [3 Oct 1974] 22044/75 Heading G1U [Also in Division G3] Errors that arise in the prior art method of measuring a corona discharge current between an electrode 3 and a plate 2, Fig. 3, by measuring the voltage across a resistor R 2 in series with the discharge device, the errors arising because of a capacitance C3 that appears parasitically across the discharge device 2, 3 are eliminated by arranging the device X, Fig. 4, which shows the equivalent circuit R 1 , CR 1 , CR 2 , C 1 of the device in full lines, by applying a reduced supply voltage across the bridge of insufficient amplitude to cause a discharge to occur, by balancing the bridge, and then by measuring the diagonal voltage across the bridge when the full supply voltage is applied. In the circuit shown the diagonal voltage is amplified and used retroactively to control the voltage applied across the bridge so that the discharge current remains constant. As described the plate 2 forms part of a photoreceptor in a xerographic printing apparatus and the refinements of the invention over the prior art are especially desirable because of the tendency to use supply voltages in the range 400 to 600 Hz rather than mains frequency, to eliminate the production of strobed charge patterns.
GB2204475A 1974-10-03 1975-05-22 Corona current measurement and control arrangement Expired GB1467935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US511831A US3908164A (en) 1974-10-03 1974-10-03 Corona current measurement and control arrangement

Publications (1)

Publication Number Publication Date
GB1467935A true GB1467935A (en) 1977-03-23

Family

ID=24036629

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2204475A Expired GB1467935A (en) 1974-10-03 1975-05-22 Corona current measurement and control arrangement

Country Status (7)

Country Link
US (1) US3908164A (en)
JP (1) JPS5163662A (en)
CA (1) CA1033805A (en)
DE (1) DE2539400A1 (en)
FR (1) FR2287045A1 (en)
GB (1) GB1467935A (en)
NL (1) NL7510460A (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028596A (en) * 1974-12-13 1977-06-07 Coulter Information Systems, Inc. Corona power supply circuit
FR2353085A1 (en) * 1976-05-26 1977-12-23 Canon Kk PROCESS AND DEVICE FOR CHARGING AN ELECTROPHOTOGRAPHIC REPRODUCING ORGAN BY FLUID DISCHARGE
DE3142325C2 (en) * 1981-10-24 1983-08-25 Hewlett-Packard GmbH, 7030 Böblingen Bridge circuit for measuring purposes
JPS59500879A (en) * 1982-05-20 1984-05-17 ピ−エイ　コンサルテイング　サ−ビシ−ズ　リミテツド Charge status indicator
US5055269A (en) * 1989-03-06 1991-10-08 Bacharach, Inc Temperature limited catalytic gas detector apparatus
KR970005219B1 (en) * 1990-09-14 1997-04-14 캐논 가부시끼가이샤 Image forming apparatus
US5359393A (en) * 1992-12-22 1994-10-25 Xerox Corporation Method and apparatus for measuring photoreceptor voltage potential using a charging device
US6034368A (en) * 1998-07-06 2000-03-07 Xerox Corporation AC corona current regulation
US6777959B2 (en) * 2001-06-21 2004-08-17 Xerox Corporation Method of determining a resistive current
US7030600B2 (en) * 2003-11-04 2006-04-18 Raytheon Company Broadband microwave power sensor
US6991367B2 (en) * 2003-11-04 2006-01-31 Raytheon Company Integrated thermal sensor for microwave transistors
US7670045B2 (en) * 2004-06-18 2010-03-02 Raytheon Company Microstrip power sensor
US8159236B2 (en) * 2009-04-03 2012-04-17 Xerox Corporation Corona effluent sensing device
JP5909785B2 (en) * 2010-12-07 2016-04-27 デスコ インダストリーズ， インコーポレイテッド Ionization balance device with shielded capacitor circuit for ion balance measurement and adjustment
WO2013085952A1 (en) 2011-12-08 2013-06-13 3M Innovative Properties Company An ionization monitoring device and method
CN103048519B (en) * 2012-12-12 2015-01-07 华北电力大学 Measuring apparatus and method for corona initial current
CN112730929A (en) * 2021-03-30 2021-04-30 南京菲迈斯智能科技有限公司 Multifunctional electric power Internet of things measuring sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604925A (en) * 1968-12-03 1971-09-14 Zerox Corp Apparatus for controlling the amount of charge applied to a surface
US3763410A (en) * 1971-09-17 1973-10-02 Du Pont Method of treating material by electrical discharge

Also Published As

Publication number Publication date
NL7510460A (en) 1976-04-06
CA1033805A (en) 1978-06-27
FR2287045B1 (en) 1979-03-09
US3908164A (en) 1975-09-23
DE2539400A1 (en) 1976-05-13
FR2287045A1 (en) 1976-04-30
JPS5163662A (en) 1976-06-02
JPS6253779B2 (en) 1987-11-12

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930522