US3656021A - Corona discharge device - Google Patents

Corona discharge device Download PDF

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Publication number
US3656021A
US3656021A US110697A US3656021DA US3656021A US 3656021 A US3656021 A US 3656021A US 110697 A US110697 A US 110697A US 3656021D A US3656021D A US 3656021DA US 3656021 A US3656021 A US 3656021A
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US
United States
Prior art keywords
corona discharge
electrode
electrodes
vibration
discharge device
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 - Lifetime
Application number
US110697A
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English (en)
Inventor
Masayoshi Furuichi
Seiichi Miyakawa
Nobuchika Masuda
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.)
Katsuragawa Electric Co Ltd
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Katsuragawa Electric Co Ltd
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 Katsuragawa Electric Co Ltd filed Critical Katsuragawa Electric Co Ltd
Application granted granted Critical
Publication of US3656021A publication Critical patent/US3656021A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices
    • 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

Definitions

  • This invention relates to a corona discharge device.
  • Corona discharge devices are widely used in various industrial fields such as electrophotographic machines, printing machines, paper manufacturing machines or the like for depositing or neutralizing electrostatic charges.
  • the corona discharge device utilized for these purposes generally comprises a corona discharge electrode in the form of fine metal wires or rods and a counter electrode confronting the corona discharge electrode with an air gap.
  • the width of the air gap is made generally small, a few millimeters, for the purpose of efficiently depositing the charge with relatively low voltage so that if the length of discharge electrode is long, say about one meter, the electrode tends to vibrate due to electrostatic attraction or mechanical vibration thus resulting in spark discharge or short circuiting between the corona discharge electrode and the counter electrode.
  • spark discharge or short circuiting causes breakage of the corona discharge electrode. For this reason it is necessary to provide some means for preventing such vibration of the corona discharge electrode.
  • a fine corona discharge electrode and a counter electrode for establishing corona discharge between said corona discharge electrode and said counter electrode characterized in that a vibration suppression member is positioned between said corona discharge electrode and said counter electrode and substantially parallel thereto for preventing transverse vibration of said corona discharge electrode by electrostatic force.
  • FIG. 1 shows a side view of one embodiment of this invention
  • FIG. 2 shows a cross-sectional view of the corona discharge device shown in FIG. 1;
  • FIG. 3 to FIG. 8 diagrammatically show modified embodiments of this invention.
  • the corona discharge device thus far described is of the conventional type.
  • vibration suppressing members 7 made of insulating material or metal wires coated with electric insulative material are disposed between corona discharge electrodes 3 and corresponding counter electrodes 2 in parallel therewith, with the opposite ends of the suppressing members mechanically secured to side frames 1.
  • This arrangement of the suppressing members effectively limits transverse vibration of the corona discharge electrodes 3 thus preventing spark discharge or short circuiting mentioned above between the corona discharge electrodes and the counter electrode.
  • the potential gradients near the corona discharge electrodes are substantially identical whether the vibration suppression members 7 are used or not provided that the corona discharge electrodes are held stationary. In the absence of the vibration suppressing members, however, when the corona discharge electrode are moved transversely, the potential gradients near the corona discharge electrodes increase on one side on which the distance between the corona discharge electrodes and the counter electrodes has decreased whereas the potential gradients decrease on the opposite side on which the distance between these electrodes has increased, thus attracting the corona discharge electrodes towards the counter electrodes on said first mentioned side.
  • the vibration suppression members are not made of an electric insulator having sufficiently high mechanical strength such as nylon, for example, it is necessary to use reinforcing metal cores.
  • the number and position of the vibration suppressing members are not limited to those illustrated hereinabove.
  • the relative arrangements of the corona discharge electrode 3 and vibration suppression members 7 shown in FIGS. 3, 4 and 5 are effective to prevent vibrations of the corona discharge electrode in both vertical and horizontal directions.
  • vibration suppressing members 7 are provided between each corona discharge electrode and a counter electrode cooperating therewith.
  • a transparent conductive glass plate 11 such as Nesa glass is used as the counter electrode as shown in FIG. 7
  • corona discharge electrodes 3 and vibration suppressing members 7 may be arranged in two staggered parallel rows.
  • the counter electrode 2 may take the form of an inverted cup shape as shown in FIG. 8 in which vibration suppressing members 7 are disposed between one corona discharge electrode 3 and three sides of the counter electrode. It will be clear that in this invention it is not always necessary to dispose the corona discharge electrode at the geometrical center of the vibration suppressing members as shown in FIGS. 3 and 4 but may be displaced slightly therefrom.
  • this invention provides an improved corona discharge device capable of efficiently preventing the vibration of the corona discharge electrode by simple means.
  • the invention has been shown and described in terms of corona discharge devices for use in electrophotography, it is evident that the novel corona discharge device can also be used in many other fields where it is necessary to deposit or neutralize electrostatic charges.
  • a corona discharge device of the class comprising a fine corona discharge electrode and a counter electrode for establishing corona discharge between said corona discharge electrode and said counter electrode
  • the improvement which comprises a vibration suppression member positioned between said corona discharge electrode and said counter electrode and substantially parallel thereto for preventing transverse vibration of said corona discharge electrode by electrostatic force.
  • vibration suppressing members comprise metal wires coated with insulating films.
  • corona discharge device comprises a plurality of spaced apart vertical metal electrodes, said corona discharge electrode is positioned intermediate each pair of adjacent metal electrodes and said suppressing members are disposed between said corona discharge electrode and said pair of metal electrodes.
  • corona discharge device comprises a flat sheet of conductive glass and said vibration suppressing members and a plurality of corona discharge electrodes are disposed in two parallel rows on one side of said conductive glass, said vibration suppressing members and said corona discharge electrodes being staggered with respect to each other.
  • corona discharge device takes the form of an inverted cup and said corona discharge electrode and said vibration suppressing members are disposed in said inverted cup.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
US110697A 1970-01-29 1971-01-28 Corona discharge device Expired - Lifetime US3656021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45007856A JPS4829182B1 (de) 1970-01-29 1970-01-29

Publications (1)

Publication Number Publication Date
US3656021A true US3656021A (en) 1972-04-11

Family

ID=11677259

Family Applications (1)

Application Number Title Priority Date Filing Date
US110697A Expired - Lifetime US3656021A (en) 1970-01-29 1971-01-28 Corona discharge device

Country Status (5)

Country Link
US (1) US3656021A (de)
JP (1) JPS4829182B1 (de)
DE (1) DE2103956C3 (de)
FR (1) FR2077085A5 (de)
GB (1) GB1331339A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729649A (en) * 1972-05-25 1973-04-24 Eastman Kodak Co Corona charging apparatus
US3916269A (en) * 1973-02-09 1975-10-28 Turlabor Ag Charging device
US4141648A (en) * 1976-12-15 1979-02-27 International Business Machines Corporation Photoconductor charging technique
US4335420A (en) * 1978-07-11 1982-06-15 Ricoh Co., Ltd. Corona discharge device
US4549244A (en) * 1983-12-08 1985-10-22 Xerox Corporation Corona generating device
US4652754A (en) * 1985-12-23 1987-03-24 Eastman Kodak Company Corona generating apparatus
US4656356A (en) * 1982-10-30 1987-04-07 Fuji Photo Film Co., Ltd. Device for charging electrophotographic apparatus
US7043176B1 (en) 2002-09-26 2006-05-09 Eastman Kodak Company Apparatus and method for damping a corona wire in an electrographic printer
CN107601091A (zh) * 2017-08-29 2018-01-19 北京普惠实华科技有限公司 一种气力输送中用振动消除静电的装置及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58135752U (ja) * 1982-03-05 1983-09-12 ティーディーケイ株式会社 静電式複写機用帯電装置
JPH0614261B2 (ja) * 1987-03-20 1994-02-23 双葉電子工業株式会社 表示装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470417A (en) * 1966-10-03 1969-09-30 Eastman Kodak Co Method of altering electrostatic charge on an insulating material
US3581149A (en) * 1967-07-14 1971-05-25 Canon Camera Co Corona discharging device for electrophotographic process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470417A (en) * 1966-10-03 1969-09-30 Eastman Kodak Co Method of altering electrostatic charge on an insulating material
US3581149A (en) * 1967-07-14 1971-05-25 Canon Camera Co Corona discharging device for electrophotographic process

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729649A (en) * 1972-05-25 1973-04-24 Eastman Kodak Co Corona charging apparatus
US3916269A (en) * 1973-02-09 1975-10-28 Turlabor Ag Charging device
US4141648A (en) * 1976-12-15 1979-02-27 International Business Machines Corporation Photoconductor charging technique
US4335420A (en) * 1978-07-11 1982-06-15 Ricoh Co., Ltd. Corona discharge device
US4656356A (en) * 1982-10-30 1987-04-07 Fuji Photo Film Co., Ltd. Device for charging electrophotographic apparatus
US4549244A (en) * 1983-12-08 1985-10-22 Xerox Corporation Corona generating device
US4652754A (en) * 1985-12-23 1987-03-24 Eastman Kodak Company Corona generating apparatus
US7043176B1 (en) 2002-09-26 2006-05-09 Eastman Kodak Company Apparatus and method for damping a corona wire in an electrographic printer
CN107601091A (zh) * 2017-08-29 2018-01-19 北京普惠实华科技有限公司 一种气力输送中用振动消除静电的装置及方法

Also Published As

Publication number Publication date
GB1331339A (en) 1973-09-26
JPS4829182B1 (de) 1973-09-07
DE2103956B2 (de) 1974-03-07
DE2103956A1 (de) 1971-08-12
FR2077085A5 (de) 1971-10-15
DE2103956C3 (de) 1974-09-26

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