US3758204A - Developing device of the wet developing agent type for electrophotographic duplication - Google Patents

Developing device of the wet developing agent type for electrophotographic duplication Download PDF

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Publication number
US3758204A
US3758204A US00310154A US3758204DA US3758204A US 3758204 A US3758204 A US 3758204A US 00310154 A US00310154 A US 00310154A US 3758204D A US3758204D A US 3758204DA US 3758204 A US3758204 A US 3758204A
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United States
Prior art keywords
developing
developing agent
photosensitive
electrode plate
latent image
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Expired - Lifetime
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US00310154A
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English (en)
Inventor
N Mochizuki
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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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
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material

Definitions

  • ABSTRACT A device wherein a coat of a developing agent adhesion preventing material is applied to the surface of an opposed electrode plate disposed in juxtaposed relation to a photosensitive body.
  • a viscous developing liquid of high toner concentration is supplied to a space between the photo-sensitive body and the developing agent adhesion preventing material layer of this opposite electrode plate by a liquid circulating mechanism so as to convert an electrostatic latent image on the photosensitive body into a toner image capable of being transferred to copy sheets.
  • a developing liquid used comprises a pigment and a resin which are generally in a ratio 1:1 to 1:10. Developing liquids of this range of component ratios are low in transfer duplication efficiency. It has thus been usual practice to increase the component ratio of developing liquids to 1:5 to 1:300 so as to increase toner concentration and to use as the resin component a material showing high viscosity when transfer duplication is carried out whereby transfer duplication efficiency can be increased.
  • This invention has as its object the provision of a developing device of the wet developing agent type for electrophotographic duplication which permits a viscous developing liquid of high toner concentration to flow smoothly in a stream on the opposite electrode plate without stagnating in the passage for-liquid flow defined by such plate.
  • the invention contemplates the provision of a coat of a developing agent adhesion preventing-material, such for example as a silicone resin, tetrafluoroethylene or the like, on the surface of the opposite electrode plate on which a stream of a developing liquid of high toner concentration is forcedly supplied by liquid circulating means, such for example as a pump.
  • a developing agent adhesion preventing-material such for example as a silicone resin, tetrafluoroethylene or the like
  • FIG. 1 is a sectional view of a developing device of the wet developing agent type for electrophotographic duplication comprising one embodiment of this invention.
  • FIG. 2 is a perspective view of the opposite plate section of the device shown in FIG. 1.
  • a drum 2 supported by a shaft 1 is directly provided on its peripheral surface with a layer of a photosensitive material, such for example as selenium, cadmium sulfide, poly-N-vinyl carbazole or the like.
  • the drum 2 is adapted to be rotated in the direction of an arrow a and subjected to electric charging and exposing to an optical image of an original by known means (not shown).
  • the photosensitive material layer may be indirectly provided on the peripheral surface of the drum 2 as by applying to the drum a sheet-material on which the photosensitive layer is formed. Recording paper on which an electrostatic latent image is formed may be used in place of the sheet material.
  • a developing tray 4 supporting on its surface an op.- posite electrode plate 3 made of metal isdisposed downwardly rightwardly of the drum 2, the opposite electrode plate 3 being disposed along substantially one fourth the extent of the lower half of the peripheral surface of the drum 2 and adapted to face the photosensitive material layer on the peripheral surface of the drum with a very small clearance between them.
  • the photosensitive material layer on the peripheral surface of the drum formed thereon with the electrostatic latent image of the original by being subjected to electric charging and exposing to an optical image of the original is brought to a position in which it is juxtaposed to the surface of the opposite electrode plate 3 on which a developing liquid is supplied.
  • a developing agent adhesionv preventing material coat 3a of a very small thickness is formed on the surface of the opposite electrode plate 3 which faces the photosensitive material layer on the drum 2.
  • the coat thickness of the coat 3a being determined such that the function of the opposite electrode plate 3 is not interfered with.
  • the developing agent adhesion preventing material may be selected from the group consisting of a silicone resin, tetrafluoroethylene, polyurethane, polypropylene,'polyethylene, polyester, nylon, vinylidene chloride, vinyl chloride, polycarbonate and cellulose acetate.
  • a silicone resin tetrafluoroethylene, polyurethane, polypropylene,'polyethylene, polyester, nylon, vinylidene chloride, vinyl chloride, polycarbonate and cellulose acetate.
  • One of these materials is applied as a coat to the surface of the opposite electrode plate 3 by known means.
  • a voltage of a polarity commensurate with the polarity of the charge carried by the photosensitive material layer on, the drum is impressed on the opposite electrode plate 3.
  • the opposite electrode plate 3 may be grounded or electrically cut off.
  • a drain 5 is provided in a left .end of the bottom of the developing tray 4 as ,seen in FIG. 1, and a funnelshaped receiver 6 having a sharply inclined 'conical wall opens below the lower end of the drain 5, the receiver 6 being connected at its narrowed lower end to a bent pipe 7 connected to a pump 8 for moving a developing liquid in a circulating stream.
  • the conical wall of the receiver 6 is inclined at an angle no smaller than 30 C.
  • a developing liquid 9 (e.g. a viscous liquid of high toner concentration) in the receiver 6 is supplied under high pressure by the pump 8 through a pipe 10 to a nozzle 11 shown in FIG. 2 which is formed by pressing the front end of the pipe 10 into planar form.
  • the nozzle 11 includes a planar orifice 11a which opens above a space A between the peripheral surface of the drum 2 on which the photosensitive material layer is formed and the coated surface 3a of the opposite electrode plate 3 as shown in FIG. 1.,
  • the developing liquid 9 is caused to flow under high pressure into the space A by the action of the pump 8.
  • the stream of the developing liquid flows down in the space A as indicated by an arrow.
  • the provision of the layer 3a is effective to prevent adhesion of the developing agent to the opposite electrode plate 3 and enables to convert an electrostatic latent image on the peripheral surface of the drum 2 into a toner image satisfactorily.
  • the stream of the developing liquid can thus be moved smoothly in circulation into the receiver 6 through the developing tray 4.
  • a developing device of the wet developing agent type for electrophotographic duplication using a viscous developing liquid of high toner concentration comprising:
  • a. means including a photosensitive body, for forming an electrostatic latent image on the photosensitive body;
  • an opposite electrode plate disposed in close proximity to said photosensitive body in face-to-face relation thereto for developing the electrostatic latent image, said photosensitive body and said plate defining a space between them for flow of developing liquid;
  • developing liquid supply means for supplying the developing liquid into said space between said photosensitive body and said opposite electrode plate to develop said electrostatic latent image by the developing liquid
  • a pump adapted to cause a stream of the developing liquid to flow in circulation
  • a device as set forth in claim 1 wherein said developing liquid supply means is a nozzle having a flat orifice at its forward end.
  • said developing agent adhesion preventing material is selected from the group consisting of a silicone resin, tetrafluoroethylene, polyurethane, polypropylene, polyethylene, polyester, nylon, vinylidene chloride, vinyl chloride,polycarbo nate and cellulose acetate.
  • Apparatus for developing an electrotatic latent image comprising: A V
  • a. means including a photosensitive surface moveable along a defined path, for forming an electrostatic latent image on the photosensitive surface;
  • an electrode plate for cooperating with said photosensitive surface to develop the latent image by application of a developing agent, 'said plate having an extended surface disposed in facing, closely spaced relation to the path of movement of'said 1 photosensitive surface for defining therewith a space for developing liquid;

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Liquid Developers In Electrophotography (AREA)
US00310154A 1971-12-07 1972-11-28 Developing device of the wet developing agent type for electrophotographic duplication Expired - Lifetime US3758204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46099226A JPS526090B2 (enrdf_load_stackoverflow) 1971-12-07 1971-12-07

Publications (1)

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US3758204A true US3758204A (en) 1973-09-11

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US00310154A Expired - Lifetime US3758204A (en) 1971-12-07 1972-11-28 Developing device of the wet developing agent type for electrophotographic duplication

Country Status (4)

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US (1) US3758204A (enrdf_load_stackoverflow)
JP (1) JPS526090B2 (enrdf_load_stackoverflow)
DE (1) DE2259482C3 (enrdf_load_stackoverflow)
GB (1) GB1414335A (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878816A (en) * 1973-07-26 1975-04-22 Xerox Corp Imaging system
US4013356A (en) * 1974-04-11 1977-03-22 Agfa-Gevaert, A.G. Apparatus for developing electrostatic images with liquid toner
US4077711A (en) * 1974-05-28 1978-03-07 Ricoh Company, Ltd. Electrophotographic copying apparatus of wet developing type
US4110029A (en) * 1973-09-27 1978-08-29 Canon Kabushiki Kaisha Liquid developer for an electrostatic copying device
US4179210A (en) * 1976-09-30 1979-12-18 Agfa-Gevaert, A.G. Apparatus for developing latent electrostatic images
FR2567287A1 (fr) * 1984-07-06 1986-01-10 Savin Corp Copieur electrophotographique pour reproduction en couleurs differentes
US4623241A (en) * 1981-11-18 1986-11-18 Nashua Corporation Developing apparatus and method for a photocopier employing liquid development
EP0203720A1 (en) * 1985-05-06 1986-12-03 Photon Chroma Inc Toner Flow control system for an aperture card or microfiche film element
US5036365A (en) * 1988-11-21 1991-07-30 Benzion Landa Field assisted filter and electrophotographic copying machine using the same
US5220384A (en) * 1988-11-21 1993-06-15 Spectrum Sciences B.V. Liquid developer based imaging machine using a developing electrode
US5436706A (en) * 1991-07-09 1995-07-25 Indigo N.V. Latent image development apparatus
USRE37859E1 (en) 1991-07-09 2002-09-24 Indigo N.V. Development control system
WO2006090352A1 (en) * 2005-02-22 2006-08-31 Hewlett-Packard Development Company, L.P. Reverse flow binary image development
US20110074894A1 (en) * 2008-06-05 2011-03-31 David Sabo Reducing Ink Droplets Generated By Bursting Bubbles In An Ink Developer
US10816917B2 (en) * 2017-06-30 2020-10-27 Canon Kabushiki Kaisha Developing apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51152340U (enrdf_load_stackoverflow) * 1975-05-20 1976-12-04
DE3021050A1 (de) 1980-06-04 1981-12-10 Hoechst Ag, 6000 Frankfurt Vorrichtung zum abtragen von entwicklerfluessigkeit von einem aufzeichnungsmaterial

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253060A (en) * 1939-12-16 1941-08-19 Eastman Kodak Co Coating apparatus
US3284224A (en) * 1963-01-04 1966-11-08 Xerox Corp Controlled xerographic development
US3334613A (en) * 1964-10-28 1967-08-08 Xerox Corp Xerographic development apparatus
US3682542A (en) * 1970-08-14 1972-08-08 Dennison Mfg Co Development of electrostatic images

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253060A (en) * 1939-12-16 1941-08-19 Eastman Kodak Co Coating apparatus
US3284224A (en) * 1963-01-04 1966-11-08 Xerox Corp Controlled xerographic development
US3334613A (en) * 1964-10-28 1967-08-08 Xerox Corp Xerographic development apparatus
US3682542A (en) * 1970-08-14 1972-08-08 Dennison Mfg Co Development of electrostatic images

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878816A (en) * 1973-07-26 1975-04-22 Xerox Corp Imaging system
US4110029A (en) * 1973-09-27 1978-08-29 Canon Kabushiki Kaisha Liquid developer for an electrostatic copying device
US4013356A (en) * 1974-04-11 1977-03-22 Agfa-Gevaert, A.G. Apparatus for developing electrostatic images with liquid toner
US4077711A (en) * 1974-05-28 1978-03-07 Ricoh Company, Ltd. Electrophotographic copying apparatus of wet developing type
US4179210A (en) * 1976-09-30 1979-12-18 Agfa-Gevaert, A.G. Apparatus for developing latent electrostatic images
US4623241A (en) * 1981-11-18 1986-11-18 Nashua Corporation Developing apparatus and method for a photocopier employing liquid development
FR2567287A1 (fr) * 1984-07-06 1986-01-10 Savin Corp Copieur electrophotographique pour reproduction en couleurs differentes
EP0203720A1 (en) * 1985-05-06 1986-12-03 Photon Chroma Inc Toner Flow control system for an aperture card or microfiche film element
US5036365A (en) * 1988-11-21 1991-07-30 Benzion Landa Field assisted filter and electrophotographic copying machine using the same
US5220384A (en) * 1988-11-21 1993-06-15 Spectrum Sciences B.V. Liquid developer based imaging machine using a developing electrode
US5436706A (en) * 1991-07-09 1995-07-25 Indigo N.V. Latent image development apparatus
US5596396A (en) * 1991-07-09 1997-01-21 Indigo N.V. Latent image development apparatus
USRE37859E1 (en) 1991-07-09 2002-09-24 Indigo N.V. Development control system
WO2006090352A1 (en) * 2005-02-22 2006-08-31 Hewlett-Packard Development Company, L.P. Reverse flow binary image development
US20110074894A1 (en) * 2008-06-05 2011-03-31 David Sabo Reducing Ink Droplets Generated By Bursting Bubbles In An Ink Developer
US8523340B2 (en) * 2008-06-05 2013-09-03 Hewlett-Packard Development Company, L.P. Reducing ink droplets generated by bursting bubbles in an ink developer
US10816917B2 (en) * 2017-06-30 2020-10-27 Canon Kabushiki Kaisha Developing apparatus

Also Published As

Publication number Publication date
DE2259482C3 (de) 1979-10-31
JPS526090B2 (enrdf_load_stackoverflow) 1977-02-18
GB1414335A (en) 1975-11-19
DE2259482A1 (de) 1973-06-14
DE2259482B2 (de) 1979-03-08
JPS4864938A (enrdf_load_stackoverflow) 1973-09-07

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