US3555378A - Charging xerographic images - Google Patents

Charging xerographic images Download PDF

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Publication number
US3555378A
US3555378A US729094A US3555378DA US3555378A US 3555378 A US3555378 A US 3555378A US 729094 A US729094 A US 729094A US 3555378D A US3555378D A US 3555378DA US 3555378 A US3555378 A US 3555378A
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US
United States
Prior art keywords
corona
charging
point
charge
area
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
US729094A
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English (en)
Inventor
Ian E Smith
Kenneth A Metcalfe
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.)
Australian Government
SEC DEP OF SUPPLY
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Australian Government
SEC DEP OF SUPPLY
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 Australian Government, SEC DEP OF SUPPLY filed Critical Australian Government
Application granted granted Critical
Publication of US3555378A publication Critical patent/US3555378A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/0291—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 apparatus for charging surfaces, such as xerographic surfaces or insulating membranes, and in particular it relates to the charging of surfaces by means of a corona.
  • each corona pattern spreads outwards from the point at which it is generated, with a maximum field density effect at the center of the discharge and a gradually decreasing intensity outwards therefrom, and for this reason,
  • the primary object of this invention therefore is to allow a more uniform charge to be obtained than was heretofore possible, and secondly to achieve this in a simpler manner.
  • the objects of the invetion are achieved by moving a. single corona point relative to the work piece being charged in such a manner that the required band selectively sweeps the surface about a radius to produce a relatively uniform charge acceptance.
  • FIG. 1 is a side elevation view of the apparatus
  • FIG. 2 is a plan view of same, indicating the corona field density
  • FIG. 3 is a graph showing the charge density effect at different corona distances from a workpiece.
  • FIG. 4 shows a modified apparatus
  • the sheet 1 to be charged is placed on a rotating disc 2 with a charging point 3 positioned outside the periphery of the disc 2, and a high voltage is applied between the charging point 3 and the disc 2.
  • a high voltage is applied between the charging point 3 and the disc 2.
  • the present invention however, produces a uniform charge density over a large area, this charge being limited to a maximum just below the critical value which causes the central zone type of charging.
  • the disc charging device referred to above when the disc or baseplate rotates, the rate of charge acceptance is reduced at the center of the corona and increased in the outer zone of the corona.
  • the corona envelope, of charge density decreasing from the pattern center outwards, is matched to the moving electroradiographic member in such a manner that the charge acceptance increases from the corona center outwards.
  • Charge uniformity and charging time for a particular size of electrophotographic member is adjusted experimentally by varying the height and the distance of the corona point from the center of the disc for a given applied voltage as stated.
  • the invention can be variously applied but in each case there will be a relative motion between the corona producing device and the surface on which the charge is being developed and this will be so arranged that there is a scanning of the whole of the area by a part of the corona discharge which will produce a relatively uniform charge over the required area.
  • the high voltage generator 13 and the driving motor 14 for the disc 2 are housed in the base 8, voltage controls 9 being provided, the point 3 being adjustable up and down on the stem 10, by means of collar 11 with locking knob 12 of conventional construction and if required the point 3 may be axially adjustable in collar 11 to allow a required pattern to be achieved.
  • the point 3 is adjustable up and down on the stem 10 by means of collar 11 with locking knob 12 of conventional construction and if required the point 3 may be axially adjustable in collar 11 to allow a required pattern to be achieved.
  • FIG. 4 Such an embodiment is shown in FIG. 4 where 15 represents a disc rotating about the axis 16 and carrying a series of work pieces 17 which pass through the corona zones 18 generated from the points 19.
  • the work pieces 17 can be placed into position at S on the disc 15 and are then carried through the charge zones 18 to be finally removed at F.
  • the corona or a series of coronas, are directed to charge a xerographic surface which has relative rotation to the point about an axis perpendicular to the surface, and when an area of charge is required which is longer than the radius of the corona at the xerographic surface the point, or one of the points only, is arranged to have its field extended from an area outside of the xerographic surface inwards to beyond the axis of rotation, with the center of the corona. preferably just outside of the edge of the area being charged.
  • Apparatus for charging surfaces comprising: a disc on which a member having an insulating layer can be carried, at least one corona discharge point disposed above said disc, said disc being rotatable about an axis perpendicular to the plane of the disc, means to rotate the disc, and means to apply a voltage between the discharge point and the said disc, said point being so disposed in relation to the said rotational axis that the center of the corona is disposed near the outer edge of the area being charged with part of the corona extending inward toward the axis of rotation, whereby a relatively uniform charging per incremental area is attained during rotation.
  • Apparatus according to claim 1 wherein a single point is used which is disposed approximately over the edge of the said disc and faces generally toward the said disc.
  • Apparatus according to claim 1 comprising a shield disposed rearwardly of the said point to assist control of the corona pattern.
  • Apparatus for charging surfaces comprising: a support on which a member having an insulating layer can be carried, said support being planar and having an edge, a single corona discharge point disposed above the said support approximately at the edge thereof and facing said support, said discharge point and support being arranged to allow relative rotational motion about an axis perpendicular to the plane of the support, means to cause the relative motion, and means to apply a voltage between the discharge point and the said support, said point being so disposed in relation to the said rotational axis that the center of the corona is disposed near the outer edge of the area being charged with part of the corona extending inward toward the axis of rotation, whereby a relatively uniform charging per incremental area is attained during rotation.
  • Apparatus for charging surfaces comprising: a sup port on which a member having an insulating layer can be carried, at least one corona discharge point disposed above the said support arranged to allow relative rotational motion about an axis perpendicular to the plane of the support, means to cause the relative motion, and means to apply a voltage between the discharge point and the said support, said point being so disposed in relation to the said rotational axis that the center of the corona is disposed near the outer edge of the area being charged with part of the corona extending inward toward the axis of rotation and said discharge point being so positioned in relation to the edge of the area being charged that the center part of the corona is outside of the charging area whereby a relatively uniform charging per incremental area is attained during rotation.

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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)
  • Elimination Of Static Electricity (AREA)
US729094A 1967-05-15 1968-05-14 Charging xerographic images Expired - Lifetime US3555378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU21718/67A AU412176B2 (en) 1967-05-15 1967-05-15 Charging xerographic images

Publications (1)

Publication Number Publication Date
US3555378A true US3555378A (en) 1971-01-12

Family

ID=3710958

Family Applications (1)

Application Number Title Priority Date Filing Date
US729094A Expired - Lifetime US3555378A (en) 1967-05-15 1968-05-14 Charging xerographic images

Country Status (7)

Country Link
US (1) US3555378A (forum.php)
AU (1) AU412176B2 (forum.php)
BE (1) BE715208A (forum.php)
DE (1) DE1772432C3 (forum.php)
FR (1) FR1578969A (forum.php)
GB (1) GB1211422A (forum.php)
NL (1) NL145686B (forum.php)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711710A (en) * 1969-11-07 1973-01-16 Australia Res Lab Method of and means for controlling corona emission
US3729649A (en) * 1972-05-25 1973-04-24 Eastman Kodak Co Corona charging apparatus
US3866096A (en) * 1972-09-28 1975-02-11 Commw Of Australia Charging photoconductive membranes
WO1979000603A1 (en) * 1978-02-08 1979-08-23 Milty Prod Ltd Alleviating the effects of static charge on gramophone records
DE10323777B4 (de) * 2002-05-29 2005-09-22 Visteon Global Technologies, Inc., Van Buren Township Corona-Gerät mit zwei Elektroden und zur Oberflächenbehandlung von Drosselklappen-Körpern aus Kunststoff
EP2384096A2 (de) 2010-04-30 2011-11-02 tantec Oberflächenbehandlung GmbH Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen
DE102010018922A1 (de) * 2010-04-30 2011-11-03 tantec Oberflächenbehandlung GmbH Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711710A (en) * 1969-11-07 1973-01-16 Australia Res Lab Method of and means for controlling corona emission
US3729649A (en) * 1972-05-25 1973-04-24 Eastman Kodak Co Corona charging apparatus
US3866096A (en) * 1972-09-28 1975-02-11 Commw Of Australia Charging photoconductive membranes
WO1979000603A1 (en) * 1978-02-08 1979-08-23 Milty Prod Ltd Alleviating the effects of static charge on gramophone records
DE10323777B4 (de) * 2002-05-29 2005-09-22 Visteon Global Technologies, Inc., Van Buren Township Corona-Gerät mit zwei Elektroden und zur Oberflächenbehandlung von Drosselklappen-Körpern aus Kunststoff
EP2384096A2 (de) 2010-04-30 2011-11-02 tantec Oberflächenbehandlung GmbH Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen
DE102010018922A1 (de) * 2010-04-30 2011-11-03 tantec Oberflächenbehandlung GmbH Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen
DE102010018922B4 (de) * 2010-04-30 2014-09-04 Tantec Deutschland GmbH Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen

Also Published As

Publication number Publication date
BE715208A (forum.php) 1968-09-30
DE1772432B2 (de) 1973-08-30
FR1578969A (forum.php) 1969-08-22
NL145686B (nl) 1975-04-15
NL6806873A (forum.php) 1968-11-18
GB1211422A (en) 1970-11-04
DE1772432C3 (de) 1974-03-28
AU412176B2 (en) 1971-04-06
AU2171867A (en) 1969-11-20
DE1772432A1 (de) 1971-12-09

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