US3169886A - Apparatus for the electrophotographic production of images - Google Patents

Apparatus for the electrophotographic production of images Download PDF

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Publication number
US3169886A
US3169886A US69402A US6940260A US3169886A US 3169886 A US3169886 A US 3169886A US 69402 A US69402 A US 69402A US 6940260 A US6940260 A US 6940260A US 3169886 A US3169886 A US 3169886A
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United States
Prior art keywords
electrode
discharge
semi
electrode means
conductor layer
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Expired - Lifetime
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US69402A
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English (en)
Inventor
Simm Walter
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Bayer AG
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Bayer AG
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Publication date
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Publication of US3169886A publication Critical patent/US3169886A/en
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    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing

Definitions

  • FIG. 4 AMQW w ATTORNEYS United States Patent Ofifice 3,159,886 Patented Feb. 16, 1965 AFPARA'EUS Walter Simrn, 8 fahrilren rpo;
  • the invention relates to an apparatus for the electrophotographic production of images on light-sensitive semiconductor layers, in which first of all a latent conductivity image is produced by exposure to light, which image is developed by transfer of a coloured aerosol in the stationary electrical field of a corona discharge.
  • an electrode arrangement consisting of a pointed electrode on which the corona discharge occurs and an opposed plate-like electrode, on which the semiconductor layer or a support with the semi-conductor layer is located, it is only possible to develop an image of a certain size, as the intensity of the electrical field over the plate decreases very rapidly with increasing distance away from the point directly opposite the pointed electrode. Owing to the decreasing field intensity, the colouring also becomes proportionately Weaker away from this point.
  • the said difficulties are obviated according to the invention by positioning the discharge electrode on a movable holder device and guiding it at constant speed over that surface of the semi-conductor layer which is to be developed.
  • each spot of the surface can come at least once into very close proximity to the discharge elec trode.
  • the discharge field can be extended to a large area with a relatively small electrode distance so that the development of images on large surfaces becomes possible.
  • a considerable advantage associated with the use of a moving electrode arrangement is that a plurality of discharge points, each with a corona discharge, can be simultaneously employed, since lattice formation does not occur with the development of the image because of the movement.
  • the use of a plurality of such electrode points enables the ion stream to be substantially strengthened and the development time shortened.
  • an arrangement which has proved to be practicable is for the electrode points to be arranged in a row and to be moved along this row at a constant speed, the semi-conductor layer being advanced also at a constant speed. at righ-an ies to the direction of movement of the points, in order to obtain a uniform development of the image over the entire surface.
  • FIG. 1 is an elevation view of apparatus according to the invention, showing the discharge electrodes mounted on an endless belt, in side elevation;
  • FIG. 2 is an elevation view of apparatus according to the invention, including the equipment shown in FIG. 1, and showing the discharge electrode endless belt in FIG. 1 as the same is seen along line 2-2 in FIG. 1;
  • FIG. 3 is a showing of an alternative construction for the endless belt discharge electrode, the showing in this figure corresponding to the showing of the endless belt discharge electrode in FIG. 2;
  • FIG. 4 is a top plan view of a portion of the endless belt discharge electrode shown in FIG. 3.
  • a continuous metal chain a fitted with metal points is, for example, used as discharge electrode (FIG. 1), the said chain being guided over two sprocket wheels [2, b.
  • the sprocket wheel 12 is provided with a gear k and the gear is driven by drive gear I, to impart motion in the direction indicated by the arrows in to the endless discharge electrode a.
  • the extended portion of the chain lies parallel to the semi-conductor layer 0.
  • the points d extend outwardly and upon voltage being applied each separately produces a corona discharge.
  • the chain is set in motion by means of electric motor driving one of the sprocket wheels through the gearing l, k, so that the electrode points may move at a velocity of a few centimetres per second to a few metres per second relative to the semi-conductor layer.
  • the points can also be staggered relatively to one another.
  • FIG. 3 and FIG. 4 A staggered arrangement for the electrodes is indicated in FIG. 3 and FIG. 4, wherein the electrodes 0! of the discharge electrode endless belt or chain a are staggered as is indicated in these figures.
  • the aerosol is injected into the discharge field from a slotted nozzle e as is indicated by the arrow p (FIG. 2) parallel to the semi-conductor layer or at a slight inclination to the plane of the layer and is taken up again by a second slotted nozzle 1, which is connected to a suction device which draws oif aerosol in the direction indicated by the arrow r.
  • the nozzles are positioned opposite each other at a distance of a few millimetres to a few centimetres (for example 1 cm.) so that an aerosol mist of a few millimetres, in thickness for example of 5 mm. is formed between them, the width of the aerosol mist corresponding to the Width of the slot in the nozzle.
  • Power is supplied to the discharge electrodes 0! from the supply s which is in electrical connection with the sprocket wheel 5, and metal roller g for the semi-conductor layer is grounded by connection t.
  • the support with the semi-conducting layer for example paper with zinc oxide
  • a rotating, earthed metal roller g which serves as counter-electrode.
  • the semi-conducting layer is moved through the path of the discharge from the corona discharge electrode.
  • a surface is developed which can cover an unlimited length of the paper strip over the selected width (slot length).
  • the development zone is confined to a narrow space which is very advantageous from the point of view of equipment and because of the short electrode distance made possible by the arrangement it is possible to work with relatively low voltages of a few kilovolts so that insulation is substantially simplified.
  • the aerosol stream is advantageously so guided that the dyestuff particles stream past the semi-conductor layer just above the surface thereof when the discharge electrode is without voltage and are directed on to the layer and produce the colouring of the exposed areas by the stream of ions and the electric field only when the voltage is switched on.
  • said aerosol injecting means comprises an aerosol discharge nozzle disposed on one side of the path of discharge from the electrode means, and an aerosol suction nozzle spaced from the discharge nozzle and disposed on the other side of said path, said shielding means comprising a slotted diaphragm having the slot thereof disposed for passage of the discharge therethrough along said path, the slot being narrowed than the spacing of the nozzles and portions of the diaphragm adjacent the slot overlying the nozzles.
  • said means for passing said semi-conductor layer includes a grounded roller for the passage of said layer thereover positioned opposite said electrode means and in which said electrode means are movable parallel to said roller axis.
  • said electrode means includes a multiple number of pointed electrodes positioned in an endlessly moving conveyor.
  • Improvement according to claim 1 and including a semi-conductor bearing a later conductivity image mounted on said means for passing such layer past the electrode means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Dry Development In Electrophotography (AREA)
US69402A 1959-11-18 1960-11-15 Apparatus for the electrophotographic production of images Expired - Lifetime US3169886A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF29879A DE1128293B (de) 1959-11-18 1959-11-18 Vorrichtung zur elektrophotographischen Herstellung von Bildern

Publications (1)

Publication Number Publication Date
US3169886A true US3169886A (en) 1965-02-16

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ID=7093498

Family Applications (1)

Application Number Title Priority Date Filing Date
US69402A Expired - Lifetime US3169886A (en) 1959-11-18 1960-11-15 Apparatus for the electrophotographic production of images

Country Status (6)

Country Link
US (1) US3169886A (fr)
BE (1) BE597028A (fr)
CH (1) CH390054A (fr)
DE (1) DE1128293B (fr)
FR (1) FR1273337A (fr)
GB (1) GB932855A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254215A (en) * 1965-01-18 1966-05-31 Australia Res Lab Corona discharge apparatus with a rotatable roller electrode having a multiplicity of corona discharge spikes mounted thereon
US3417734A (en) * 1964-04-07 1968-12-24 Bayer Ag Apparatus for developing a latent electrostatic image with a liquid aerosol
US3476935A (en) * 1965-08-30 1969-11-04 Commw Of Australia Control of xerographic images by charging the photoconductor with only an outer band of a corona discharge
US3608821A (en) * 1965-10-15 1971-09-28 Agfa Gevaert Ag Electrostatic atomization of liquids
US3783826A (en) * 1971-08-20 1974-01-08 Xerox Corp Ion film regulating device
US3887809A (en) * 1972-06-22 1975-06-03 Hoechst Ag Corona discharge device
US3974796A (en) * 1974-11-21 1976-08-17 Xerox Corporation Dual mode apparatus for developing latent electrostatic images
US4033292A (en) * 1974-11-21 1977-07-05 Xerox Corporation Apparatus for developing latent electrostatic images
US4098227A (en) * 1977-07-27 1978-07-04 Xerox Corporation Biased flexible electrode transfer
US5483324A (en) * 1993-07-06 1996-01-09 Nec Corporation Charging device for an image forming apparatus

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1549875A (en) * 1921-11-23 1925-08-18 Int Precipitation Co Method of separating poorly-conducting fibrous and granular materials
US2545354A (en) * 1950-03-16 1951-03-13 Gen Electric Electrostatic generator
US2614901A (en) * 1949-08-04 1952-10-21 Carlyle W Jacob Recording head for facsimile reproduction and the like
US2626865A (en) * 1951-05-08 1953-01-27 Haloid Co Portable electrophotographic powder-image transfer mechanism
US2684902A (en) * 1951-11-23 1954-07-27 Haloid Co Image transfer mechanism for electrostatically adhering images
US2764500A (en) * 1951-10-04 1956-09-25 Huebner Company Method and apparatus for reproducing images
US2771336A (en) * 1952-02-14 1956-11-20 Jack E Macgriff Image control tube and method of printing
US2777745A (en) * 1952-10-04 1957-01-15 Gen Dynamics Corp Electrostatic recording apparatus
US2868989A (en) * 1956-01-03 1959-01-13 Haloid Xerox Inc Electrostatic charging method and device
US2914221A (en) * 1955-08-16 1959-11-24 Haloid Xerox Inc Aerosol bomb development
US2932690A (en) * 1956-09-21 1960-04-12 Addressograph Multigraph Apparatus for image reproduction
US2932548A (en) * 1956-09-21 1960-04-12 Addressograph Multigraph Apparatus for reproduction of images
US2934650A (en) * 1957-04-10 1960-04-26 Haloid Xerox Inc Charging apparatus
US2942573A (en) * 1958-04-01 1960-06-28 Haloid Xerox Inc Xerographic developing apparatus
US2965481A (en) * 1955-08-01 1960-12-20 Haloid Xerox Inc Electrostatic charging and image formation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777957A (en) * 1950-04-06 1957-01-15 Haloid Co Corona discharge device

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1549875A (en) * 1921-11-23 1925-08-18 Int Precipitation Co Method of separating poorly-conducting fibrous and granular materials
US2614901A (en) * 1949-08-04 1952-10-21 Carlyle W Jacob Recording head for facsimile reproduction and the like
US2545354A (en) * 1950-03-16 1951-03-13 Gen Electric Electrostatic generator
US2626865A (en) * 1951-05-08 1953-01-27 Haloid Co Portable electrophotographic powder-image transfer mechanism
US2764500A (en) * 1951-10-04 1956-09-25 Huebner Company Method and apparatus for reproducing images
US2684902A (en) * 1951-11-23 1954-07-27 Haloid Co Image transfer mechanism for electrostatically adhering images
US2771336A (en) * 1952-02-14 1956-11-20 Jack E Macgriff Image control tube and method of printing
US2777745A (en) * 1952-10-04 1957-01-15 Gen Dynamics Corp Electrostatic recording apparatus
US2965481A (en) * 1955-08-01 1960-12-20 Haloid Xerox Inc Electrostatic charging and image formation
US2914221A (en) * 1955-08-16 1959-11-24 Haloid Xerox Inc Aerosol bomb development
US2868989A (en) * 1956-01-03 1959-01-13 Haloid Xerox Inc Electrostatic charging method and device
US2932690A (en) * 1956-09-21 1960-04-12 Addressograph Multigraph Apparatus for image reproduction
US2932548A (en) * 1956-09-21 1960-04-12 Addressograph Multigraph Apparatus for reproduction of images
US2934650A (en) * 1957-04-10 1960-04-26 Haloid Xerox Inc Charging apparatus
US2942573A (en) * 1958-04-01 1960-06-28 Haloid Xerox Inc Xerographic developing apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417734A (en) * 1964-04-07 1968-12-24 Bayer Ag Apparatus for developing a latent electrostatic image with a liquid aerosol
US3254215A (en) * 1965-01-18 1966-05-31 Australia Res Lab Corona discharge apparatus with a rotatable roller electrode having a multiplicity of corona discharge spikes mounted thereon
US3476935A (en) * 1965-08-30 1969-11-04 Commw Of Australia Control of xerographic images by charging the photoconductor with only an outer band of a corona discharge
US3608821A (en) * 1965-10-15 1971-09-28 Agfa Gevaert Ag Electrostatic atomization of liquids
US3783826A (en) * 1971-08-20 1974-01-08 Xerox Corp Ion film regulating device
US3887809A (en) * 1972-06-22 1975-06-03 Hoechst Ag Corona discharge device
US3974796A (en) * 1974-11-21 1976-08-17 Xerox Corporation Dual mode apparatus for developing latent electrostatic images
US4033292A (en) * 1974-11-21 1977-07-05 Xerox Corporation Apparatus for developing latent electrostatic images
US4098227A (en) * 1977-07-27 1978-07-04 Xerox Corporation Biased flexible electrode transfer
US5483324A (en) * 1993-07-06 1996-01-09 Nec Corporation Charging device for an image forming apparatus

Also Published As

Publication number Publication date
CH390054A (de) 1965-03-31
GB932855A (en) 1963-07-31
BE597028A (fr) 1961-03-01
FR1273337A (fr) 1961-10-06
DE1128293B (de) 1962-04-19

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