US3921180A - Device for direct electrostatic recording using a spray electrode - Google Patents

Device for direct electrostatic recording using a spray electrode Download PDF

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Publication number
US3921180A
US3921180A US473772A US47377274A US3921180A US 3921180 A US3921180 A US 3921180A US 473772 A US473772 A US 473772A US 47377274 A US47377274 A US 47377274A US 3921180 A US3921180 A US 3921180A
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US
United States
Prior art keywords
toner material
record carrier
electrode
toner
spray electrode
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
US473772A
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English (en)
Inventor
Hans-Dieter Hinz
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.)
US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3921180A publication Critical patent/US3921180A/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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—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 powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/342—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 powder image is formed directly on the recording material, e.g. by using a liquid toner by forming a uniform powder layer and then removing the non-image areas

Definitions

  • ABSTRACT A device for direct electrostatic recording in which [30] Foreign Application Pri ity D t conductive toner material is removed from a record June 9, 1973 Germany; 2329595 Carrier by Way of electric Voltage applied to Spray 7 electrodes.
  • the spray electrode has a tip which almost 52 US. Cl. 346/74 ES 346/74 TP touches the toner material and the voltage applied to [51] Int. 2 G11B 11/02.
  • the electrode is chosen such that the force of adhesion [58] Field of Search 346/74 74 S 74 SB of the toner material is overcome only directly under- 346/74 *i- 1713/66 neath the tip. The charged toner material is attracted by the electrode and is subsequently deposited adja- [56] References Cited cent the location on the record carrier from which the UNITED STATES PATENTS toner material has been removed.
  • the recorded information will be visible in a properly recognizable form, for example, in black (color of the record carrier) on white (color of the toner).
  • the record carrier is situated between a coloring member and an electrode array.
  • an electric field is applied between the color member and the electrode array, the conductive toner material is transported to the record carrier arranged therebetween.
  • Electrodes shaped as characters in combination with a layer of toner supplied by the coloring member are Electrodes shaped as characters in combination with a layer of toner supplied by the coloring member.
  • the invention has for its object to dispense with the supply of toner on the coloring member and to reduce the cost of snychronizing the two recording actions such as the choice of the characters and of the recording. location.
  • the spray electrode comprises a pointed or wedgeshaped part which is adapted to operate in very close proximity to the toner material, the voltages applied to the electrode being chosen such that the adhesion of the toner material to the record carrier is overcome only directly underneath the tip or the top of the wedge, the charged toner material attacked by the electrode being subsequently deposited adjacent the location on the record carrier from which the tone material has been removed.
  • FIG. 1 is a diagrammatic sectional view of a spray electrode and a record carrier in a device according to the invention
  • FIG. 2 is a diagrammatic plan view of the arrangement shown in FIG. 1,
  • FIG. 3 is a diagrammatic side elevation of the device according to the invention.
  • FIG. 4 shows a spray electrode shaped as a character.
  • FIG. I shows a record carrier consisting of a strip of, for example, normal paper 1 a well known electrical insulation, (record carrier substrate) which is uniformly covered by a thin loose layer of toner 2.
  • the toner particles of an electrically conductive material have a diameter of a few microns and a suitable power of adhesion and cohesion.
  • the record carrier 1, 2 thus prepared is transported in the position shown between a counter-electrode plate 4 (at earth potential) and a recording spray electrode 3.
  • the spray electrode 3 is moved by way ofa holder 5 in accordance with the analog signal to be recorded.
  • the tip 3 of the spray electrode 3 just fails to touch the toner layer (not shown). In an extreme case this tip may even touch the record carrier.
  • the controlled voltage application to the spray electrode 3 and the coordinated recording movements thus release toner material from small pointshaped and arbitrarily long line segments on the record carrier substrate, the said toner material being transported to the spray electrode 3 and back again to the edge regions of the points or lines.
  • the partly exposed record carrier substrate displays the information through the color contrast between substrate and toner layer.
  • the record carrier substrate 1 can be provided with a toner layer for example:
  • the record carrier 9, for example, normal paper is covered with toner 2 in a loop 10. This is successively effected during transport. Recording is effected on the record carrier 9' thus covered by means of a spray electrode device 3, 4, S as shown in FIG. 1.
  • the toner layer is durably bonded to the paper substrate by means of a known fixation device 11.
  • the method using spray electrodes can also be applied for writing digital characters.
  • the spray electrodes for, for example, normal writing should then be shaped as a wedge 12 instead of being round and pointed.
  • FIG. 4 shows this for the character H by way of example. This character can be provided on known type faces.
  • the simplifications offered by the recording method and the device using spray electrodes for performing this method are suitable for application in compact apparatus, for example, hard-copy printers, printers for desk computers, etc..
  • the transparent record carrier substrate prepared with toner acts as a (constant) intermediate record carrier (for example, in the form of an endless loop).
  • This carrier can be printed at option with alpha- 4 numerical text by means of a spray electrode device.
  • the text is then optically transferred (for example, according to the transparency method) to a selenium drum on which it is stored in the form of charge images.
  • the text can be printed on normal paper in a subsequent phase of a xerographic process. Erasing is effected, in as far as necessary, by covering the toner layer carrying the information again, for example, as in the device shown in FIG. 3.
  • a device for direct electrostatic recording of the type using conductive toner material uniformly deposited on an electrically insulating record carrier comprising a pointed spray electrode means facing said toner material and in very close proximity thereto for attracting the toner material only directly underneath the tip of thespray electrode means and for subsequently depositing the attracted toner material adjacent the location on the record carrier from which the toner material has been removed in response to an electrical voltage, and means for applying to said electrode an electrical voltage modulated by information to be recorded.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
US473772A 1973-06-09 1974-05-28 Device for direct electrostatic recording using a spray electrode Expired - Lifetime US3921180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2329595A DE2329595C3 (de) 1973-06-09 1973-06-09 Anordnung für direkte elektrostatische Aufzeichnung mit Versprüh-Elektrode

Publications (1)

Publication Number Publication Date
US3921180A true US3921180A (en) 1975-11-18

Family

ID=5883617

Family Applications (1)

Application Number Title Priority Date Filing Date
US473772A Expired - Lifetime US3921180A (en) 1973-06-09 1974-05-28 Device for direct electrostatic recording using a spray electrode

Country Status (5)

Country Link
US (1) US3921180A (enrdf_load_stackoverflow)
JP (1) JPS5023712A (enrdf_load_stackoverflow)
DE (1) DE2329595C3 (enrdf_load_stackoverflow)
FR (1) FR2232814B1 (enrdf_load_stackoverflow)
GB (1) GB1474947A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS536043A (en) * 1976-07-07 1978-01-20 Nippon Telegr & Teleph Corp <Ntt> Recording device
JPS57116950U (enrdf_load_stackoverflow) * 1981-12-25 1982-07-20

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294149A (en) * 1940-05-03 1942-08-25 Western Union Telegraph Co Method of and means for recording signals
US3257222A (en) * 1962-07-02 1966-06-21 Xerox Corp Electrostatic recording method and apparatus using shaped electrodes
US3450831A (en) * 1966-02-11 1969-06-17 Gen Electric Information recording and display with particle migration in an electric field
US3472687A (en) * 1965-03-24 1969-10-14 Denki Onkyo Co Ltd Transparent electrostatic recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294149A (en) * 1940-05-03 1942-08-25 Western Union Telegraph Co Method of and means for recording signals
US3257222A (en) * 1962-07-02 1966-06-21 Xerox Corp Electrostatic recording method and apparatus using shaped electrodes
US3472687A (en) * 1965-03-24 1969-10-14 Denki Onkyo Co Ltd Transparent electrostatic recording medium
US3450831A (en) * 1966-02-11 1969-06-17 Gen Electric Information recording and display with particle migration in an electric field

Also Published As

Publication number Publication date
DE2329595C3 (de) 1981-12-03
GB1474947A (en) 1977-05-25
DE2329595B2 (de) 1981-04-09
JPS5023712A (enrdf_load_stackoverflow) 1975-03-14
FR2232814A1 (enrdf_load_stackoverflow) 1975-01-03
DE2329595A1 (de) 1975-01-02
FR2232814B1 (enrdf_load_stackoverflow) 1979-08-03

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