US2879422A - Electrostatic writing tube - Google Patents

Electrostatic writing tube Download PDF

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Publication number
US2879422A
US2879422A US713831A US71383158A US2879422A US 2879422 A US2879422 A US 2879422A US 713831 A US713831 A US 713831A US 71383158 A US71383158 A US 71383158A US 2879422 A US2879422 A US 2879422A
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US
United States
Prior art keywords
writing
wire
wires
tube
target
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
US713831A
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English (en)
Inventor
Howard C Borden
Robert W Crews
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.)
AB Dick Co
Original Assignee
AB Dick 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
Priority to NL112816D priority Critical patent/NL112816C/xx
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US713866A priority patent/US2978607A/en
Priority to US713831A priority patent/US2879422A/en
Priority to DED33183A priority patent/DE1196303B/de
Priority to FR785876A priority patent/FR1220202A/fr
Priority to BE575458A priority patent/BE575458A/fr
Priority to GB34531/61A priority patent/GB894966A/en
Priority to GB4493/59A priority patent/GB894965A/en
Application granted granted Critical
Publication of US2879422A publication Critical patent/US2879422A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
    • H01J31/06—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with more than two output electrodes, e.g. for multiple switching or counting
    • H01J31/065—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with more than two output electrodes, e.g. for multiple switching or counting for electrography or electrophotography, for transferring a charge pattern through the faceplate

Definitions

  • an improved electrostatic printing tube which has as its target a wire array consisting of small-diameter, short, closely spaced, parallel and mutually insulated w rev segments which have one of their ends extending through the target wall to the outside of the tube.
  • a conductive plane at anode potential which can thus be termed an external anode, is positioned opposite the Wire ends which are outside the tube, and a dielectric writing medium is passed between the external anode plane and the wire ends.
  • Means are provided for sweeping the electron beam generated in the tube across the wires and maintaining the beam turned off, except when it traverses selected ones of the wires. These wires then charge up toward the cathode potential. When the potential of any wire reaches a critical value with respect to the external anode, a discharge takes place between that wire and the plane. If the writing medium is present, it is at anode potential and the discharge results in a spot of charge under the wire and on the dielectric writing material. Means are provided for repetitively sweeping the electron beam across the wires as well as controlling its intensity so that, as the dielectric writing medium is moved, charges are deposited thereon which, upon subsequent development, produce visible characters corresponding to the ones dictated by the deflection and intensity-control signals.
  • the wire-t0- wire capacity is high, whereas the wire-to-anode capacity is low.
  • the adjacent wire, and to a lesser degree, all succeeding wires also charge towards cathode potential because of the coupling capacity between them. This effect can result in loss of definition.
  • An object of this invention is to minimize detrimental wire-to-wire capacity in an electrostatic writing tube.
  • Another object of this invention is to provide a novel and improved target arrangement for an electrostatic writing tube.
  • Still another object of the present invention is to provide an improved electrostatic printing tube.
  • Yet another object of the present invention is to provide an electrostatic printing tube which has better definition than was obtainable heretofore.
  • Figure 1 is a cross section of an electrostatic tube including an improved target in accordance with this invention
  • Figure 2 is an enlarged cross section of a means for supporting a writing wire in accordance with this invention as shown in Figure 1;
  • Figure 3 is a cross section of another embodiment of an improved means for supporting a writing wire in accordance with this invention.
  • FIG. l where there may be seen a cross-sectional view of an electrostatic writing tube with an improved target in accordance with this invention.
  • the electrostatic writing tube is a conventional cathode-ray tube, except for its target.
  • an evacuated envelope 10 which has therein a cathode 12, a control electrode 14, an anode or accelerating electrode 16, a focus coil 18, and a deflection coil 20.
  • the cathode 12 is connected to a negative point of potential in the operating-potential supply 22. Signals are applied to the intensity-control grid from a signal source 24. Deflection signals are applied to the deflection coil from a deflection-signal source 26. By means of a voltage-dropping resistor 28, the required more-positive operating potential is applied to the anode 16 and to the focus coil 18.
  • the target includes a face plate 30, which is at anode potential. Insulatingly supported within a slot in the target is a plurality of wires 32. Each one of these wires is separated from the other by a material such as glass and is mounted so that one end extends through to the outside face of the tube, which is finished in fiat fashion so that a dielectric writing medium 34, such as paper, may be passed extremely close to the wire points which are arrayed in a column, to receive electrostatic charges.
  • An external plane or conductor 36 is connected to the anode and extends along the column of wire points, and is spaced therefrom.
  • the cathode-ray beam which emanatesv from the cathode is deflected by the deflection-signal source to sweep across the portions of the wires which are inside the tube. Whether or not a wire is energized is determined by the intensity-control signals received from the signal source 24 at the time the electron beam is directed upon it.
  • a suitable scanning mechanism such as a facsimile scanner or television camera
  • the writing paper 34 is moved at a synchronized vertical scanning speed, a pattern of charges will be deposited on the writing paper, which when subsequently developed, using well-known electrostatic developing techniques, will produce a visible image of the original copy.
  • each one of the wires 32 in the target was separated from the adjacent wire by the glass insulating medium within the target. Since the wires are substantially parallel to one another, the wire-to-wire capacity is high and the wire-to-ground capacity is low. Accordingly, when the electron beam strikes a given wire and causes it to charge toward cathode potential, which is necessary before the wire can discharge, to a lesser degree all succeeding wires also charge toward cathode potential because of the coupling capacity between them.
  • wire-to-wire capacity is minimized by reducing the parallel length of each writing wire to the shortest possible, and also by minimizing the solid dielectric enclosed length of the wire.
  • Figure 2 which is an enlarged cross section of the support 40 for a reading wire in the target shown in Figure 1
  • each one of the reading wires 32 is supported spaced from each other between two semicylinders 40A, 40B of glass.
  • These semicylinders are sealed together'to support the writing wire with the writing points 42 extending external to the tube.
  • the sides of the semicylinders are sealed at points 41A, 41B by means of a vacuum seal to the outside portion of the face plate 30.
  • An opening 43 is made in the interior portion of the faceplate to permit the electron beam to impinge upon a portion of the writing wire.
  • This portion of the writing wire extends outside of the semicylinders and is attached to a glass rod 44, which itself is'sealed to the glass semicylinder 40B.
  • FIG. 2 is an end view of the arrangement whereby the writing wires may be mounted.
  • the two semicylindrical halves will be in a slot in the target face plate and will extend over thatportion of the face of the target which it is desiredto use for writing.
  • Each one of the writing wires is mounted spaced apart from the adjacent writing wires. The length of writing wire parallel to an adjacent writing wire is reduced considerably and the amount of solid dielectric between writing wires is also reduced considerably over that which has been used previously.
  • Figure 3 shows an end View of an arrangement for supporting the writing wires which provides still less solid dielectric between the writing wires and still less length of writin wire parallel to an adjacent writing wire.
  • an arcuate sector of dielectric material 46 such as glass, is formed of two abutting arcuate sectors 46A, 463. These have one end of the writing wire 32 sealed between the abutting portions with the terminating end 32A substantially flush with the exterior periphery of the arcuate sector. The other end 3213 of the writing wire is attached to one end of the arcuate sector 46B, so that the writing wire effectively forms a chord with the arcuate sector.
  • the means for fastening the wire end 32B to the arcuate sector end 46B includes a glass rod 44 sealed between the arcuate sector 46B and the face plate 5t) ofthe target.
  • the target face plate is slotted over the writing wires to permit access thereto by the electron beam.
  • the length of the writing Wire required by this embodiment of the invention is made as short as possible, and its dielectric enclosed length is held to a minimum. Thereby, the wire-to-wire capacity is minimized, which reduces the wire-charging and discharging time for a given beam voltage in current.
  • an electrostatic writing tube of the type having a target including an array of separate writing wires insulatingly supported in the face plate of said tube with one of their ends external to said tube, and having electron bearn means for raising the potential of selected ones of said wires until a discharge occurs to an anode external to said tube
  • an improved arrangement for supporting each Writing wire comprising two adjacent arcuate portions of a hollow cylinder made of a dielectric material, means for supporting said two arcuate portions of a hollow cylinder to extend externally from said target face plate in an abutting relationship with the portion of each writing wire terminating in said one end extending therebetween, means for holding the end of each writing wire oppositesaid one end to extend a portion of each writing wire across one of said two adjacent arcuate portions of a hollow cylinder, a slot in said target face plate positioned over the portions of said writing wires extending across said one arcuate portion and through which said electron beams can raise the potential of selected ones of said wires.
  • an improved arrangement for supporting each writing wire comprising two halves of a hollow cylinder made of dielectric material, a slot in the side of said target face plate external to said tube, means for holding said two halves of a hollow cylinder in abutting relationship in saidface plate slot with the portion of each Writing wire terminating in said one end being held between said two halves, means for holding the end of said writing wire opposite to said one end to extend the adjacentportion of said writing Wire substantially in the plane of said target face plate, and a slot on the internal side of said target face .plate extending over said portion of said writing wires substantially in the plane of said target face plate through which said electron beams can raise the potential of selected ones of said Wires.
  • an electrostatic writing tube of the type having a target including an array of separate writing wires insulatingly supported in the face plate of said tube With one each writing wire comprising two adjacent sections of the wall of acylinder made of a dielectric material, first means for supporting one of said adjacent sections at one end from the external side of said target face plate, second means for supporting the other of said adjacent sections at one end from the external side of said face plate to abut with its other end the other end of said one of said adjacent sections with the portion of each writing wire terminating in said one end extending between said abutting ends, said second means including means for holding the end of said writing wires opposite to said one end, and a slot in said target face plate positioned over'said writing wires through which said electron beams can raise the potential of selected ones of said wires.
  • an improved target comprising an arcuate sector of a dielectric material, a plurality of separate writing wires having one end extending through said arcuate sector and terminating substantially flush with the external periphery of said arcuate sector, means for fastening the other end of said Writing wires to one side of said arcuate sector, a target face plate means for sealing said arcuate sector ends to said target faceplate, and an opening in said target face plate over said writing wires.
  • an improved target comprising a hollow dielectric cylinder, a plurality of separate writing wires extending through said hollow dielectric cylinder, separately spaced from oneanother in acommon plane, and with one end substantially flush withthe outer periphery of said cylinder and the other end extending beyond said cylinder, means for fastening said other end of said writing wire to bend the portion of said wire external to said cylinder away from the portion of said wire within said cylinder, at target face plate having internal and external sides, a slot in said target face plate external side to hold a portion of said cylinder,

Landscapes

  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US713831A 1958-02-07 1958-02-07 Electrostatic writing tube Expired - Lifetime US2879422A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL112816D NL112816C (is") 1958-02-07
US713866A US2978607A (en) 1958-02-07 1958-02-07 Electrostatic writing tube
US713831A US2879422A (en) 1958-02-07 1958-02-07 Electrostatic writing tube
DED33183A DE1196303B (de) 1958-02-07 1959-01-29 Elektrostatische Kathodenstrahl-Schreibroehre
FR785876A FR1220202A (fr) 1958-02-07 1959-02-05 Dispositif imprimeur électrostatique
BE575458A BE575458A (fr) 1958-02-07 1959-02-06 Tube d'impression électrostatique.
GB34531/61A GB894966A (en) 1958-02-07 1959-02-09 Improvements in or relating to electrostatic writing tubes
GB4493/59A GB894965A (en) 1958-02-07 1959-02-09 Improvements in or relating to electrostatic writing tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US713831A US2879422A (en) 1958-02-07 1958-02-07 Electrostatic writing tube

Publications (1)

Publication Number Publication Date
US2879422A true US2879422A (en) 1959-03-24

Family

ID=24867712

Family Applications (1)

Application Number Title Priority Date Filing Date
US713831A Expired - Lifetime US2879422A (en) 1958-02-07 1958-02-07 Electrostatic writing tube

Country Status (5)

Country Link
US (1) US2879422A (is")
DE (1) DE1196303B (is")
FR (1) FR1220202A (is")
GB (2) GB894965A (is")
NL (1) NL112816C (is")

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001849A (en) * 1958-07-15 1961-09-26 Xerox Corp Apparatus for electrostatic recording
DE1134708B (de) * 1960-05-11 1962-08-16 Zeiss Ikon Ag Verfahren und Vorrichtung zur Aufzeichnung und Wiedergabe von Nachrichten oder Fernsehbildern als Ladungsverteilung auf einem bewegten Aufzeichnungsmittel
US3075859A (en) * 1959-02-20 1963-01-29 Dick Co Ab Copy sheet for electrostatic printing
DE1154825B (de) * 1961-05-26 1963-09-26 Bosch Gmbh Robert Verfahren und Geraet zur Wiedergabe von auf Speichermedien aufgezeichneten Signalen, insbesondere von Bildsignalen, mit Hilfe von Elektronenstrahlen
US3136917A (en) * 1960-03-14 1964-06-09 Dick Co Ab Electrostatic writing means
US3157811A (en) * 1960-03-14 1964-11-17 Dick Co Ab Electrostatic printing tube having unique anode structure
US3157879A (en) * 1959-12-28 1964-11-17 Ibm Apparatus for printing by means of an electron beam
US3241934A (en) * 1961-03-20 1966-03-22 American Optical Corp Method for making electron image transfer device
US3321308A (en) * 1963-05-17 1967-05-23 Xerox Corp Xerographic induction recording
US20050212868A1 (en) * 2004-03-26 2005-09-29 Radominski George Z Fluid-ejection device and methods of forming same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1087951A (en) * 1964-04-09 1967-10-18 Borg Warner Information transfer system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567210A (is") 1957-05-10
NL112553C (is") 1957-05-13

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001849A (en) * 1958-07-15 1961-09-26 Xerox Corp Apparatus for electrostatic recording
US3075859A (en) * 1959-02-20 1963-01-29 Dick Co Ab Copy sheet for electrostatic printing
US3157879A (en) * 1959-12-28 1964-11-17 Ibm Apparatus for printing by means of an electron beam
US3136917A (en) * 1960-03-14 1964-06-09 Dick Co Ab Electrostatic writing means
US3157811A (en) * 1960-03-14 1964-11-17 Dick Co Ab Electrostatic printing tube having unique anode structure
DE1134708B (de) * 1960-05-11 1962-08-16 Zeiss Ikon Ag Verfahren und Vorrichtung zur Aufzeichnung und Wiedergabe von Nachrichten oder Fernsehbildern als Ladungsverteilung auf einem bewegten Aufzeichnungsmittel
US3241934A (en) * 1961-03-20 1966-03-22 American Optical Corp Method for making electron image transfer device
DE1154825B (de) * 1961-05-26 1963-09-26 Bosch Gmbh Robert Verfahren und Geraet zur Wiedergabe von auf Speichermedien aufgezeichneten Signalen, insbesondere von Bildsignalen, mit Hilfe von Elektronenstrahlen
US3321308A (en) * 1963-05-17 1967-05-23 Xerox Corp Xerographic induction recording
US20050212868A1 (en) * 2004-03-26 2005-09-29 Radominski George Z Fluid-ejection device and methods of forming same
US7334871B2 (en) 2004-03-26 2008-02-26 Hewlett-Packard Development Company, L.P. Fluid-ejection device and methods of forming same

Also Published As

Publication number Publication date
FR1220202A (fr) 1960-05-23
NL112816C (is")
GB894966A (en) 1962-04-26
GB894965A (en) 1962-04-26
DE1196303B (de) 1965-07-08

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