US3786515A - Latent image recording method and electric recording apparatus - Google Patents

Latent image recording method and electric recording apparatus Download PDF

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Publication number
US3786515A
US3786515A US00264378A US3786515DA US3786515A US 3786515 A US3786515 A US 3786515A US 00264378 A US00264378 A US 00264378A US 3786515D A US3786515D A US 3786515DA US 3786515 A US3786515 A US 3786515A
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United States
Prior art keywords
stylus
recording
recording medium
latent image
liquid
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Expired - Lifetime
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US00264378A
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English (en)
Inventor
R Walker
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Horizons Inc
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Horizons Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements
    • H04N1/29—Reproducing arrangements involving production of an electrostatic intermediate picture
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/321—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image
    • G03G15/325—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image using a stylus or a multi-styli array

Definitions

  • ABSTRACT 1 PP 264,378 An improvement in the method and apparatus for generating imagery in which information from either an 52 U.S. c1 346/74 E Original document or an electronic input is Placed on [51] Int. Cl G03g 13/00 Paper or other suitable record medium by the use of 58 Field of Search 346/74 E, 74 ES control element) which establish an electric field jacent to the record medium; the recording element(s) [56] References Cited being immersed in liquid, described in U.S. Pat.
  • Facsimile recorders employing special papers are in wide use. Such images may be formed either through the electrolytic development of a color or through the use of an electrical discharge to vaporize (blast-off) an overlayer.
  • the present invention is an improvement upon the invention described in U.S. Pat. No. 3,623,122 which describes a method and apparatus for generating imagery in which information from either an original document or an electronic input is placed on paper or other suitable record medium by the use of control element(s) which establish an electric field adjacent to the record medium, the recording element(s) being immersed in a liquid, such liquid being an electrostatic liquid toner, as is commercially available or can be made.
  • the recording and development steps are separate and distinct with a highly insulating liquid surrounding the junction between the recording element(s) and the recording medium and covering the recording medium for the recording step and the resulting latent image being exposed to a liquid developer at a later time.
  • the recording and development steps can be separated for up to several minutes under ideal conditions, allowing any background noise or triboelectric charging produced by the recording element(s) rubbing on the recording medium to decay to a low or nonexistent level for the development step;
  • the latent image can be given a short development time to minimize background toner pickup, heretofore experienced with simultaneous recording and development;
  • An array of closely spaced recording elements may be used since the absence of electrostatic toner eliminates element to element shorting.
  • FIG. 1 is a schematic view of one kind of recorder which may be used in the practice of the invention and FIGS. 2-5 show modifications of the invention and of the apparatus of FIG. 1.
  • Example 1 is best understood with reference to FIG. 1.
  • the recorder shown in FIG. 1 includes a medium 10 upon which the record is made.
  • This recording sheet 10 may consist of a web of a clear plastic film base or any type of paper.
  • a means 8, comprising a warm air supply or heat lamps, is provided for drying the sheet so that, if the recording medium is paper, it may be thoroughly dried.
  • the recording medium 10 is guided through a compartmented trough 12, the compartment 2 at the entry end containing a highly insulating liquid 3 and the compartment at the exit end containing a liquid developer l4, rollers 16 guide the recording medium through the liquid baths.
  • Any conventional means may be utilized for advancing the recording medium through the highly insulating liquid 3 and liquid developer 14 contained in the trough 12.
  • the recording medium may be continuously drawn through the recording system or the drive may be intermittent; for example, if a single frame at a time is to be recorded. Excess developer solvent remaining on the web is removed by squeegee rollers 18 and residual developer solvent remaining on the web is removed by a warm air plenum 20.
  • the recording stylus 22 includes a stylus tip 25 which may consist of a coarse wire sharpened to a tip width of 2 to 3 mils or the tip 25 may be spherical with a radius of about 5 to 20 mils.
  • the recording stylus is moved over the surface of the recording sheet, the stylus tip contacting the recording surface, by an electromechanical drive 26.
  • a modulated source of electrical potential 30 establishes an electric field between the stylus 22 and a conducting counterelectrode 28, thereby producing a latent image on the recording medium, which image is made visible when the recording medium 10 passes into the developer bath 14.
  • the electromechanical drive which positions the stylus on the recording medium may be any one of a variety of drives well known to the art, for example, an X-Y recorder or servo drive to position the stylus in two directions or a high-speed recording pen motor or any other suitable known mechanism.
  • the electrode structure 22 may consist of a linear array of stylii extending across the recording medium in a direction perpendicular to the direction of web travel.
  • This array may be formed of printed circuit stripes upon a circuit board, the strips spaced to the inch, for example.
  • the recording potential at each stylii may be controlled by individual high voltage transistors or, for an optical input, by the use of photoconductor or photoemissive elements as described in U.S. Pat. Nos. 3,121,373 or 3,623,122.
  • FIG. 1 instead of a single trough with a divider as shown in FIG. 1 other means could be used to separate the recording and developing liquids.
  • two separate troughs 12 could be used with rollers 16 as shown in FIG. 2 or other means for guiding the recording medium from one trough to the second trough.
  • rollers 16 as shown in FIG. 2 or other means for guiding the recording medium from one trough to the second trough.
  • FIG. 3 a single trough 12 with two compartments connected by a narrow slit 17 through which the recording medium passes could be used to achieve separation. Rollers 16 might also be used instead of the slit, as shown in FIG. 4. Developer could be kept out of the insulating liquid compartment in FIGS. 3 and 4 by means of a positive pressure on the insulating liquid side, due to a difference in hydrostatic head, for example.
  • FIG. 5 shows a transfer method of copying as described in U.S. Pat. No. 3,623,122 with the modification of the copying and development steps.
  • Trough 2 contains the highly insulating liquid 3 and trough 12 contains the liquid electrostatic toner 14.
  • the image is formed on the insulating surface of a transfer roller 74.
  • This roller is uniformly coated with an insulating film 76 having a thickness in the range of l to 10 mils.
  • a preferred coating material is a vitreous enamel because of its high strength, high abrasion resistance, and ease of cleaning.
  • the latent image placed on this insulating surface 76 by the control recording head 72 which may consist of any of the previously shown types of recording head is developed in toner l4 and then transferred to the copy paper 10 by a transfer roller 78.
  • a high electrical potential may be connected between rollers 78 and 74 to aid in electrostatically transferring the image from the drum to the paper. Residual image is removed from insulating surface 76 by a cleaning brush 80.
  • the highly insulating liquid was a petroleum solvent, (Isopar G manufactured by Humble Oil and Refining Company), but any high flash point, high resistance liquid could be used such as other members of the Isopar series, or Stoddard solvent.
  • the high resistance, highly insulating liquid should preferably be one which is compatible with the developer.
  • the developer used comprised a black pigment dispersed in a hydrocarbon mixture (Hunt 25-49) diluted to 1/8 percent by volume developer in Isopar G.
  • the development step should be timed so that background noise will decay and its de' veloped densitybe very low or nonexistent. If too long a time factor is involved, the paper recording medium (not being a very good insulator) will allow the image also to decay to a point where adequate density is not obtainable upon development.
  • a recording apparatus including:
  • the apparatus of claim 1 including at least one electro-optical transducer provided for controlling the potential between said stylus and said counterelectrode, and including optics for imaging an optical signal on said electro-optical transducer.
  • the stylus comprises an array of recording elements which extend across the width of the recording medium, the signal fed to each of said elements being generated individually by electronic or photoconductor means.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Color Electrophotography (AREA)
US00264378A 1972-06-19 1972-06-19 Latent image recording method and electric recording apparatus Expired - Lifetime US3786515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26437872A 1972-06-19 1972-06-19

Publications (1)

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US3786515A true US3786515A (en) 1974-01-15

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US00264378A Expired - Lifetime US3786515A (en) 1972-06-19 1972-06-19 Latent image recording method and electric recording apparatus

Country Status (5)

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US (1) US3786515A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4953042A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA992130A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2330681A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1408505A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914771A (en) * 1973-11-14 1975-10-21 Minnesota Mining & Mfg Electrographic recording process and apparatus employing synchronized recording pulses
US4251827A (en) * 1977-12-15 1981-02-17 Ricoh Company, Ltd. Wet type direct recording method
US4368669A (en) * 1981-01-02 1983-01-18 Milliken Research Corporation Method and apparatus for non-impact printing on barrier coated substrate

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531029A (en) * 1976-06-25 1978-01-07 Oki Electric Ind Co Ltd High speed printer
US4161141A (en) * 1977-10-05 1979-07-17 Lakhani Kishor M Two side multi roller toner station for electrographic non-impact printer
DE2908446C2 (de) * 1979-03-05 1984-01-12 Philips Patentverwaltung Gmbh, 2000 Hamburg Druckeinrichtung zur elektrophoretischen Aufzeichnung
US4232555A (en) * 1979-04-18 1980-11-11 Eastman Kodak Company Ultrasonographic exposure apparatus
US5406356A (en) * 1993-08-09 1995-04-11 Lexmark International, Inc. Liquid toner imaging with contact charging

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623122A (en) * 1970-06-04 1971-11-23 Horizons Research Inc Electric recording apparatus employing liquid developer
US3622468A (en) * 1969-11-21 1971-11-23 Bell Telephone Labor Inc High-speed electrolytic printing including image intensification
US3644930A (en) * 1969-06-02 1972-02-22 Xerox Corp Multistylus recorder
US3654095A (en) * 1970-08-06 1972-04-04 Bell Telephone Labor Inc Electrolytic production of multicolored prints
US3681527A (en) * 1968-03-15 1972-08-01 Hitachi Ltd Facsimile reading and recording device
US3694574A (en) * 1969-09-16 1972-09-26 Phonocopy Inc Electrostatic facsimile printer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681527A (en) * 1968-03-15 1972-08-01 Hitachi Ltd Facsimile reading and recording device
US3644930A (en) * 1969-06-02 1972-02-22 Xerox Corp Multistylus recorder
US3694574A (en) * 1969-09-16 1972-09-26 Phonocopy Inc Electrostatic facsimile printer
US3622468A (en) * 1969-11-21 1971-11-23 Bell Telephone Labor Inc High-speed electrolytic printing including image intensification
US3623122A (en) * 1970-06-04 1971-11-23 Horizons Research Inc Electric recording apparatus employing liquid developer
US3654095A (en) * 1970-08-06 1972-04-04 Bell Telephone Labor Inc Electrolytic production of multicolored prints

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914771A (en) * 1973-11-14 1975-10-21 Minnesota Mining & Mfg Electrographic recording process and apparatus employing synchronized recording pulses
US4251827A (en) * 1977-12-15 1981-02-17 Ricoh Company, Ltd. Wet type direct recording method
US4368669A (en) * 1981-01-02 1983-01-18 Milliken Research Corporation Method and apparatus for non-impact printing on barrier coated substrate

Also Published As

Publication number Publication date
CA992130A (en) 1976-06-29
GB1408505A (en) 1975-10-01
JPS4953042A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-23
DE2330681A1 (de) 1974-01-17

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