US3660656A - Light lock for corona device - Google Patents

Light lock for corona device Download PDF

Info

Publication number
US3660656A
US3660656A US66947A US3660656DA US3660656A US 3660656 A US3660656 A US 3660656A US 66947 A US66947 A US 66947A US 3660656D A US3660656D A US 3660656DA US 3660656 A US3660656 A US 3660656A
Authority
US
United States
Prior art keywords
opening
corona discharge
flow
housing
discharge means
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
US66947A
Other languages
English (en)
Inventor
Lee F Frank
George W Alley
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3660656A publication Critical patent/US3660656A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • ABSTRACT A device having corona discharge means for generating a flow of ions arranged within a chamber that is part of a dielectric housing and is provided with an elongated opening extending to the side of the housing positionable adjacent the surface of a moving sheet or web of dielectric or photosensitive material to be treated.
  • the opening is covered with a metal screen or a small diameter rod can be arranged relative to the opening.
  • the chamber is lined with an electrically conductive shield.
  • the opening is of sufficient length so that it will extend across and beyond the side edges of the sheet or web that will be moved with respect thereto.
  • an electrically conductive and biased steering rod is arranged to direct the flow of ions from said corona discharge means through said opening.
  • An electrically conductive and biased plate is arranged between the corona discharge means and the steering rod to shape the electrical field established relative to the surface of the material to focus the flow of ions toward the screen and to prevent irradiation from said corona discharge means from passing through said opening and damaging the material being treated.
  • the device can be used with either an AC or DC source of potential applied to the corona discharge means depending upon the type of material being treated.
  • the present invention relates to. a device for treating the surfaces of a sheet or web of dielectric material, such as a photosensitive material and, more particularly, to a device which generates a flow of ions that is directed to a surface of the material for altering or neutralizing any electrostatic charge thereon, the device including a corona discharge means and means for shielding the surface of the material from any irradiation generated by the corona discharge means.
  • any corona irradiation incident on the material causes fogging streaks which results in portions of the material so exposed being rendered unusable. Consequently, in treating photosensitive materials, any device that is used to alter the electrostatic charge on the material must be one which does not fog the material and one whose efficiency is not substantially reduced by the addition of any means that might be used to shield the photosensitive material from such irradiation.
  • One object of the present invention is to provide an efiicient light lock for corona discharging means which shields a moving sheet or web of photosensitive material being treated thereby from the irradiation generated by the corona discharge device.
  • Another object of the invention is to provide a device which can be used as part of a corona discharge means, when treating or altering the electrostatic condition of a surface of a moving sheet or web of a photosensitive material, to prevent irradiation from damaging the material.
  • Another object of the invention is to provide a device for treating or altering the electrostatic condition of a surface of a moving sheet or web of dielectric material that is capable of being used with high efficiency, which is simple in construction, and is more highly efficient than devices currently in use.
  • a device having corona discharge means for generating a flow of ions arranged within a chamber that is part of a dielectric housing and is provided with an elongated opening extending to the side of the housing positionable adjacent the surface of a moving sheet or web of dielectric or photosensitive material to be treated.
  • the opening is covered with a metal screen or a small diameter rod can be arranged relative to the opening.
  • the chamber is lined with an electrically conductive shield.
  • the opening is of sufficient length so that it will extend across and beyond the side edges of the sheet or web that will be moved with respect thereto.
  • an electrically conductive and biased steering rod is arranged to direct the flow of ions from said corona discharge means through said opening.
  • An electrically conductive and biased plate is arranged between the corona discharge means and the steering rod to shape the I electrical field established relative to the surface of the materialto focus the flow of ions toward the screen and to prevent irradiation from said corona discharge means from passing through said opening and damaging the material being treated.
  • the device can be used with either an AC or DC source of potential applied to the corona discharge means depending upon the type of material being treated.
  • the device is described hereinafter as being used for removing or substantially altering electrostatic charges on a sheet or web of photographic material, it is to be understood that it can also be used with any sheet or web of dielectric material to alter the charge on a surface thereof, that is, to change the charge from one that is negative to one that is positive, or vice versa, to change the level of the charge on the surface of the web, that is, to increase or decrease the charge whether it is negative or positive, or to place a negative or a positive charge on a surface of an uncharged sheet or web.
  • the term, alter, or altering as used in this specification and in the claims is intended to include any one of the aforementioned conditions.
  • corona discharge device or means is intended to define a selfsustaining electrical discharge device for generating positive and/or negative ions in accordance with the applied voltage; that is, with alternating current applied to the corona discharge device, positive ions willbe generated on thepositive half of the cycle, whereas negative ions will be generated on the negative half, and with direct current positive or negative ions will be regenerated in accordance with the direction of current flow.
  • FIG. 1 is a schematic perspective view of a device in accordance with the invention and showing the relation of the device to a surface of a moving sheet or web of dielectric material;
  • FIG. 2 is a schematic vertical cross-sectional view of the device shown in FIG. 1 in conjunction with a simplified circuit for generating a corona discharge with a DC source of poten-
  • FIG. 3 is a vertical cross-sectional view of the device shown in FIG. 1 in which some field lines are shown together with the line of current flow;
  • FIG. 4 is a schematic vertical cross-sectional view of the device shown in FIG. 1 in conjunction with a simplified circuit for generating a corona discharge with an AC source of potential.
  • the device 10 comprises an elongated hollow housing I 11 including a generally cylindrical chamber 12 and which is fabricated of an insulating or dielectric material, such as plastic.
  • the chamber 12 is connected to a side 13 by an elongated opening 14 and is lined with a sleeve 15 fabricated of a conducting material, such as stainless steel.
  • the sleeve 15 is also provided with an opening 16 that is aligned with and, preferably, smaller in width than opening 14.
  • the chamber 12 is enclosed when each of the ends is covered by an end plate 17 which can be fabricated of an insulating material the same as that used for housing 11.
  • Attached to the side 13 of housing 11 is a pair of plates 18 which are fabricated of an electrically conductive material, such as stainless steel.
  • Each of the plates 18 is arranged along an edge of opening 14 with the edges 19 thereof forming an exit slot 20 that is aligned with openings 14 and 16.
  • Attached to plates 18 is a screen 21 of an electrically conductive material, such as stainless steel, which effectively overlies or covers the exit slot 20.
  • a single small diameter rod or a plurality of rods ex tending parallel to edges 19 can be used, the rod or rods being electrically interconnected with plates 18 in the same manner as screen 21.
  • the plates 18 and screen 21 or the rods comprise grid means for controlling a flow of ions through the exit slot 20.
  • the length of the housing 11 is such that exit slot 20 extends across and beyond the edges 22 of a moving sheet or web of a dielectric material W.
  • Web W can be any dielectric material although the invention is directed primarily to treatment of a photosensitive material because of the problem of irradiation.
  • the web W can be moved by any suitable means not shown past slot 20 and is supported in the vicinity of the device by a plate 23 which is also fabricated of an electrically conductive material, such as stainless steel.
  • a corona wire 24, which extends the length of housing 11 and is attached at it's ends in any suitable manner to the end plates 17 is arranged so as to be generally coincident with the axis of sleeve 15.
  • a steering rod 25 Positioned just above slot is a steering rod 25, which is fabricated of an electrically conductive material, such as stainless steel. Rod is generally aligned with openings 14 and 16 and slot 20 and, when biased, serves to directionally control the flow of ions from corona wire 24in chamber 12 through slot 20 and into contact with web W.
  • Steering rod 25 extends the length of housing 11 and. is attached. at its ends by any suitable means to the end plates 17.
  • an arcuate plate 26 is arranged such that it curves away from corona wire 24 and is of an electrically conductive material, such as stainless steel. Plate 26 also extends the length of housing 11 and is attached by any suitable means to end blocks 17.
  • a DC source of potential 30 is connected by line 31 to corona wire 24, and to ground via line 32.
  • Sleeve 15 and plate 26 are serially connected through an adjustable resistor 33 to ground to provide a passively generated bias for these elements.
  • the current source for resistor 33 is corona wire 24.
  • Steering rod 25, plates 18 and screen 21 are also connected to ground.
  • the embodiment shown in FIG. 2 can be used either to neutralize a charge existing on the surface of web W, or to alter an existing charge depending upon the position of switch S. If switch S is in position A, plate 23 will then be connected to ground. With switch S in position A, plate 23, plates 18 and screen 21 will be at the same level of potential, thus causing the charge present on web W to be neutralized.
  • switch S If switch S is in position B, then a bias voltage is applied to support 23 through a DC source of potential 34. Plate 23 is therefore at a different potential than plates 18 and screen 21, thus permitting a flow of ions to web W, that alters the charge on web W.
  • the polarity of the corona voltage and of the bias voltages can I be changed in accordance with the polarity of the charge to be removed or added.
  • an AC source of potential 40 is connected to the primary side of transformer 41.
  • the secondary of transformer 41 is connected by line 42 to corona wire 24 and to ground via line 43.
  • Sleeve 15 and plate 26 are serially connected byline 44 to a variable tap on the secondary of transformer 41, so that the phase and voltage of sleeve 15 and plate 26 can be controlled with respect to the phase and voltage of corona element 24.
  • Steering rod 25, plates 18 and screen 21 are also connected to ground.
  • the embodiment shown in FIG. 4 can be used to either neutralize a charge existing on web W, or to alter the existing charge on web W, depending upon the position of switch S. If switch S is in position A, then support 23 is connected to ground.
  • switch S causes support 23, plates 18 and screen 21 to be at the same potential, thus causing the charge present on the surface of the web W to be neutralized. If switch S is in position B, then a bias voltage is applied to support 23 through a DC source of potential 45. Support 23 is therefore at a different potential than plates 18 and screen 21, thus permitting a flow of ions to web W that alters the charge on the surface of web W.
  • Equal potential lines PL are formed about corona wire 24. Normally, these lines are concentric provided the wire 24 is completely confined within a tube. However, the combination of an open shield or sleeve 15 and an arcuate plate 26, which are arranged as shown, causes these equal potential lines PL to shape themselves around the plate 26 as indicated by PLl. Charged ions are known to travel in the same direction asthe field lines FL which are at right angles to the equal potential lines PL. The field lines FL are bent or formed around the plate 26 toward the control grid or screen 21. The steering rod 25 performs the final alignment of the field lines to the exit slot 20.
  • plate 26, steering rod 25, plates 18 and screen 21 comprise means for shaping the electric field to focus and directionally control the flow of ions toward the surface of the material.
  • Such means is carried by housing 11 and aligned with openings 14 and 16 between wire 24 and the surface of the material.
  • All surfaces located within chamber 12 are blackened to as sure that the light irradiating from corona wire 24 undergoes multiple reflections from black surfaces so the light is dissipated in intensity to a very low level prior to any passage thereof through exit slot 20.
  • the blackening of all surfaces within chamber 12 reduces the emitted light to between about one to four orders of magnitude.
  • Arcuate plate 26 can be about Va inch thick with approximately the same radius of curvature as sleeve 15 and is positioned so as to curve away from the ion source, namely, wire 24. Plate 26 shapes the lines of the electrical field that vis established between corona wire 24 and the surface of web W. In addition, plate 26 prevents essentially any light generated by corona wire 24 from escaping through exit slot 20 while not adding to the bulkiness of device 10. Consequently, the angle formed by corona wire 24 and the edges of plate 26 must be greater than that formed by wire 24 and the edges of opening 16in shield 15.
  • Housing 11 is made of an insulating material, preferably polymethyl methacrylate, silicone rubber or a material having similar electrical properties.
  • housing 11 should have a volume resistivity of at least 10 to 10 ohms/cm and a dielectric strength of between 400 to 4,000 volts/mil.
  • Corona wire 24 can be any one of the series normally used in the art, but preferably should be tungsten alloy having a diameter of between about 0.010 inch to 0.00025 inch.
  • Steering rod 25, plate 26, plates 18 and the rod or rods that can be used in place of screen 21 are preferably made of stainless steel, as indicated hereinabove, but could be made of an electrically conductive plastic material, electrically conductive black glass, many metals and their alloys, and the like, providing they are electrically conductive, corrosion resistant, and fall in the area of resistance of 0 to 10 ohms/cm?
  • the steering rod 25, for example, can have a diameter of about one-quarter inch.
  • corona wire 24 is maintained at a potential of approximately 15 KV, and plate 26 and sleeve 15 are maintained at approximately 4.65 KV.
  • corona wire 24 is maintained at 15 KV AC peak, while sleeve 15 and steering rod 25 are maintained at approximately 4.65 KV AC peak.
  • device 10 can be supplemented by means for measuring the amount and polarity of any electrostatic charge on web W prior to its being moved past exit slot 20, in orderthat the voltage can be varied to provide the required ionized flow of air to alter or change the electrostatic charge on web W.
  • a suitable gas under pressure can be introduced into chamber 12 to further enhance ion current output through exit slot 20.
  • a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface;
  • an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing;
  • corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface;
  • electrically biased means comprising grid means mounted on said housing relative to said opening therein and between said corona discharge means and said surface and generally in alignment with said opening in said shield for directionally controlling said flow of ions toward said surface and means arranged within said housing between said corona discharge means and grid means for shaping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said openings of any direct irradiation from said corona discharge means.
  • a device for generating and directing a flow of ions toward a surface of a dielectric material for altering the electrostatic condition thereof comprising:
  • a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface;
  • an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing;
  • corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface;
  • grid means mounted on said side in overlying relationship to said opening in said housing and providing an exit slot generally in alignment with said openings and positionable adjacent said surface, said grid means being electrically biased for controlling said flow of ions;
  • blocking means arranged within said chamber intermediate said corona discharge means and said grid means and electrically biased serially with said shield for shaping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said exit slot of any direct irradiation from said corona discharge means;
  • steering means arranged within said chamber intermediate said blocking means and said grid means and electrically biased for directionally controlling said flow of ions relative to said grid means and said surface.
  • a device in accordance with claim 2 wherein said shield is generally cylindrical and provided with an axial opening generally aligned with said opening in said housing and said exit slot.
  • said grid means comprises an electrically conductive member secured to said side adjacent each edge of said opening, the facing edges of said members forming said exit slot, and a metal screen overlying said exit slot and electrically connected to each of said members.
  • said grid means comprises an electrically conductive member secured to said side adjacent each edge of said opening, the facing edges of said members forming said exit slot and at least one metallic member extending longitudinally of said slot and electrically connected to each of said members.
  • a evrce in accordance with claim 2 wherein said 9.
  • the curvature of said plate corresponds generally to that of said shield and is positioned so as to curve away from said corona discharge means and the width of said plate is greater than that of said exit slot.
  • said steering means comprises a metal rod axially aligned with said openings and said exit slot.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Elimination Of Static Electricity (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US66947A 1970-08-26 1970-08-26 Light lock for corona device Expired - Lifetime US3660656A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6694770A 1970-08-26 1970-08-26

Publications (1)

Publication Number Publication Date
US3660656A true US3660656A (en) 1972-05-02

Family

ID=22072751

Family Applications (1)

Application Number Title Priority Date Filing Date
US66947A Expired - Lifetime US3660656A (en) 1970-08-26 1970-08-26 Light lock for corona device

Country Status (6)

Country Link
US (1) US3660656A (enrdf_load_stackoverflow)
AU (1) AU471325B2 (enrdf_load_stackoverflow)
BR (1) BR7105434D0 (enrdf_load_stackoverflow)
CA (1) CA930012A (enrdf_load_stackoverflow)
FR (1) FR2106056A5 (enrdf_load_stackoverflow)
GB (1) GB1366715A (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2359331A1 (de) * 1973-01-12 1974-07-18 Xerox Corp Bilduebertragungsvorrichtung, insbesondere zum elektrischen uebertragen xerographischer tonerbilder von einer xerographischen trommel auf ein kopierblatt
US3880514A (en) * 1973-09-14 1975-04-29 Coulter Information Systems Ion producing source for electrostatic recording apparatus
US3896310A (en) * 1971-06-30 1975-07-22 Diagnostic Instr Inc Field control in imaging systems
US3942079A (en) * 1970-10-29 1976-03-02 Brock Alan J Charging of electrophotographic surfaces
US4050377A (en) * 1974-10-30 1977-09-27 Oki Electric Industry Company, Ltd. High speed printer with heated aperture board
US4060382A (en) * 1975-07-02 1977-11-29 Stork Brabant B.V. Method and device for dye transfer printing
US4068585A (en) * 1973-05-11 1978-01-17 Electroprint, Inc. Electrostatic printer support with controlled electrostatic surface voltage
DE2850116A1 (de) * 1977-11-21 1979-06-07 Exxon Research Engineering Co Elektrostatische aufladungs- und zerstaeubungsvorrichtung und verfahren zur elektrostatischen aufladung eines nicht leitenden mediums
US4174170A (en) * 1976-12-16 1979-11-13 Minolta Camera Kabushiki Kaisha Conductive toner transfer photocopying machine
US4197568A (en) * 1977-06-20 1980-04-08 Konishiroku Photo Industry Co., Ltd. Corona generating apparatus
US4227233A (en) * 1976-10-01 1980-10-07 Olympus Optical Company Limited Corona discharge device for electrographic apparatus
US4415947A (en) * 1978-11-13 1983-11-15 Hoechst Aktiengesellschaft Method and apparatus for electrostatically charging a dielectric layer
US4564282A (en) * 1982-11-15 1986-01-14 Xerox Corporation Corona charging device
US4702248A (en) * 1986-01-29 1987-10-27 Technomed International Apparatus for generating high frequency shock waves provided with a screen which reduces the electric leakages
US4762997A (en) * 1983-11-30 1988-08-09 Xerox Corporation Fluid jet assisted ion projection charging method
US4775915A (en) * 1987-10-05 1988-10-04 Eastman Kodak Company Focussed corona charger
US4910400A (en) * 1987-10-23 1990-03-20 Eastman Kodak Company Programmable focussed corona charger
FR2690302A1 (fr) * 1992-04-17 1993-10-22 Kodak Pathe Dispositif de nettoyage pour bande de produit photosensible non exposé.
EP0671870A3 (en) * 1994-03-10 1996-06-26 Eastman Kodak Co Device and method for controlling the free load on running tracks.
US6624413B1 (en) * 2002-11-12 2003-09-23 Qc Electronics, Inc. Corona treatment apparatus with segmented electrode
US20050063130A1 (en) * 2003-09-22 2005-03-24 Christopher Francis Electrical ionizer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH626706A5 (en) * 1977-03-10 1981-11-30 Fleck Carl M Device for producing ions
AT354617B (de) * 1978-07-06 1980-01-25 Fleck Carl M Dr Vorrichtung zur erzeugung von ionen
GB8416715D0 (en) * 1984-06-30 1984-08-01 Merriman M Agricultural chemical mixing tank

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879395A (en) * 1955-06-08 1959-03-24 Haloid Xerox Inc Charging device
US3038073A (en) * 1959-03-13 1962-06-05 Rca Corp Electrostatic charging
US3409768A (en) * 1967-04-03 1968-11-05 Eastman Kodak Co Light lock for air ionizer to shield photosensitive material
US3557367A (en) * 1967-09-01 1971-01-19 Xerox Corp Method and apparatus for increasing the efficiency of corona charging of a photoconductor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879395A (en) * 1955-06-08 1959-03-24 Haloid Xerox Inc Charging device
US3038073A (en) * 1959-03-13 1962-06-05 Rca Corp Electrostatic charging
US3409768A (en) * 1967-04-03 1968-11-05 Eastman Kodak Co Light lock for air ionizer to shield photosensitive material
US3557367A (en) * 1967-09-01 1971-01-19 Xerox Corp Method and apparatus for increasing the efficiency of corona charging of a photoconductor

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942079A (en) * 1970-10-29 1976-03-02 Brock Alan J Charging of electrophotographic surfaces
US3896310A (en) * 1971-06-30 1975-07-22 Diagnostic Instr Inc Field control in imaging systems
US3850519A (en) * 1973-01-12 1974-11-26 Xerox Corp Xerographic image transfer apparatus
DE2359331A1 (de) * 1973-01-12 1974-07-18 Xerox Corp Bilduebertragungsvorrichtung, insbesondere zum elektrischen uebertragen xerographischer tonerbilder von einer xerographischen trommel auf ein kopierblatt
US4068585A (en) * 1973-05-11 1978-01-17 Electroprint, Inc. Electrostatic printer support with controlled electrostatic surface voltage
US3880514A (en) * 1973-09-14 1975-04-29 Coulter Information Systems Ion producing source for electrostatic recording apparatus
US4050377A (en) * 1974-10-30 1977-09-27 Oki Electric Industry Company, Ltd. High speed printer with heated aperture board
US4060382A (en) * 1975-07-02 1977-11-29 Stork Brabant B.V. Method and device for dye transfer printing
US4227233A (en) * 1976-10-01 1980-10-07 Olympus Optical Company Limited Corona discharge device for electrographic apparatus
US4174170A (en) * 1976-12-16 1979-11-13 Minolta Camera Kabushiki Kaisha Conductive toner transfer photocopying machine
US4197568A (en) * 1977-06-20 1980-04-08 Konishiroku Photo Industry Co., Ltd. Corona generating apparatus
US4255777A (en) * 1977-11-21 1981-03-10 Exxon Research & Engineering Co. Electrostatic atomizing device
DE2850116A1 (de) * 1977-11-21 1979-06-07 Exxon Research Engineering Co Elektrostatische aufladungs- und zerstaeubungsvorrichtung und verfahren zur elektrostatischen aufladung eines nicht leitenden mediums
US4415947A (en) * 1978-11-13 1983-11-15 Hoechst Aktiengesellschaft Method and apparatus for electrostatically charging a dielectric layer
US4564282A (en) * 1982-11-15 1986-01-14 Xerox Corporation Corona charging device
US4762997A (en) * 1983-11-30 1988-08-09 Xerox Corporation Fluid jet assisted ion projection charging method
US4702248A (en) * 1986-01-29 1987-10-27 Technomed International Apparatus for generating high frequency shock waves provided with a screen which reduces the electric leakages
US4775915A (en) * 1987-10-05 1988-10-04 Eastman Kodak Company Focussed corona charger
US4910400A (en) * 1987-10-23 1990-03-20 Eastman Kodak Company Programmable focussed corona charger
FR2690302A1 (fr) * 1992-04-17 1993-10-22 Kodak Pathe Dispositif de nettoyage pour bande de produit photosensible non exposé.
WO1993021747A1 (en) * 1992-04-17 1993-10-28 Kodak-Pathe Apparatus for cleaning a strip of unexposed photosensitive product
US5479014A (en) * 1992-04-17 1995-12-26 Eastman Kodak Company Apparatus for cleaning a strip of unexposed photosensitive product
EP0671870A3 (en) * 1994-03-10 1996-06-26 Eastman Kodak Co Device and method for controlling the free load on running tracks.
US6624413B1 (en) * 2002-11-12 2003-09-23 Qc Electronics, Inc. Corona treatment apparatus with segmented electrode
US20050063130A1 (en) * 2003-09-22 2005-03-24 Christopher Francis Electrical ionizer

Also Published As

Publication number Publication date
AU3270871A (en) 1973-03-01
CA930012A (en) 1973-07-10
AU471325B2 (en) 1976-04-15
BR7105434D0 (pt) 1973-04-10
FR2106056A5 (enrdf_load_stackoverflow) 1972-04-28
GB1366715A (en) 1974-09-11

Similar Documents

Publication Publication Date Title
US3660656A (en) Light lock for corona device
DE69726535T2 (de) Röntgenstrahlerzeuger und Vorrichtung zum Entfernen von elektrostatischen Ladungen
US2868989A (en) Electrostatic charging method and device
US6881971B2 (en) Arrangement for the suppression of particle emission in the generation of radiation based on hot plasma
DE2027336C3 (de) Vorrichtung zum Entfernen von auf einer Fläche durch elektrische Ladung gebundenen elektroskopischen TeUchen
WO1981003104A1 (en) Device for irradiating objects with electron beams
US3390266A (en) Apparatus for charging the surface of photoelectric layers using corona discharge
US4841146A (en) Self-cleaning scorotron with focused ion beam
US3529129A (en) Reflection type flash fuser
US3744898A (en) Corona discharge apparatus
US4725448A (en) Application of electrically-charged light-absorbing particles to a lenticular screen
US3456109A (en) Method and means for photoelectrostatic charging
US3937960A (en) Charging device for electrophotography
KR100842851B1 (ko) 에어로졸 입자 하전장치
US3783283A (en) Corona charging device with semiconductive shield
US4763141A (en) Printing apparatus with improved ion focus
US4040731A (en) Electrophotographic apparatus having a screen-type photoconductive drum
DE1912278C3 (de) Verfahren und Vorrichtung zum gleichförmigen Aufladen einer Fläche mittels einer Koronaentladung
DE2339458B2 (de) Elektrophotographische Kopiereinrichtung mit einer mehrschichtigen Aufzeichnungseinheit
US3742237A (en) A. c. corona charging apparatus
US4908513A (en) Charging apparatus
US3624392A (en) Electrophotographic charging apparatus comprising needle point discharge electrodes and concave shield electrodes
US2675485A (en) Lead pellet absorptive shield for betatrons
US5655186A (en) Light blocking ion charging apparatus
US4021709A (en) Method and device for charging an electrophotographic photosensitive material