US2978607A - Electrostatic writing tube - Google Patents

Electrostatic writing tube Download PDF

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Publication number
US2978607A
US2978607A US713866A US71386658A US2978607A US 2978607 A US2978607 A US 2978607A US 713866 A US713866 A US 713866A US 71386658 A US71386658 A US 71386658A US 2978607 A US2978607 A US 2978607A
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US
United States
Prior art keywords
writing
wire
tube
wires
resistance
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
US713866A
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English (en)
Inventor
Howard C Borden
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
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US713866A priority Critical patent/US2978607A/en
Priority claimed from US713831A external-priority patent/US2879422A/en
Priority to BE575458A priority patent/BE575458A/fr
Application granted granted Critical
Publication of US2978607A publication Critical patent/US2978607A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • the discharge occursV through it and results in a spot of charge under the wire onl the dielectric writing material which can be developed out to become visible'.
  • Means are providedfor repetitively sweeping the electron beam across the wires, as well as controllingits intensity so that, as the dielectric writingmedium is moved, charges are deposited thereon which, uponv subsequent development, produce visible characters corresponding to the ⁇ ones dictated by the deflection and intensity control signals.
  • the writing array consists of a' number of isolated wires which have no' direct current return path to the cathode to complete the circuit, except by the electrical discharge which does the writing. This. has two .disadvantages. First, there is no method of controlling thev electrical dischargegthat is, the discharge will continue until the wire capacitance' is discharged.”
  • an object of this invention is to provide an improved target structure' in an electrostatic writing tube for shortening the decay time of an electrical discharge occurring atl a wire end.
  • Another' object of ⁇ this invention is to provide an arrangement for increasing' the sensitivityof an'electrostatic writing tube by providing a target structure whereby a bias may be applied to the writing wires.
  • Still another. object of the present invention is to provide a structure for an electrostaticwritingtubeto improve itsV writing performance.
  • Yet another objectofthe presenti invention is'to' provid novel and-unique target--strucfuefor an electrosta e@writ-i-rigtube.m f
  • Figure 1 is a cross-sectional view of an electrostatic writing tube, including. a target in accordance with this invention
  • Figures 2 and 3 are electrical circuitrepresentations ofv Figures 4 and 5 are plan and side views of a targetv construction in accordance with this invention.
  • the electrostatic writing tu-be is a conventional cathode-ray tube, except for its target.
  • the cathode 12 is connected to a negative potential in the operating potential supply 212.
  • Signals are applied to the intensity control grid Vfrom a signal source 24.
  • Deflection signals are applied to the deflection coil ⁇ ⁇ from a deflection signal source 26.
  • a volt'- age-dropping resistor 28 the required more-positive operating potential is applied to the anode 16 and to the focus coilk 18.
  • the target may include a face plate 30, which is at anode potential. Insulatingly supported within a slot in the face plate are 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 linished in at fashion so that the dielectric Writing medium 34, such as paper, may be passed extremely close to the wire ends which are arrayed in a column, to receive electro static charges.
  • An external plane, or conductor, 36 is connected to the anodes and extends along the column of wire points, and is spaced therefrom. This plane may be considered a ground plane.
  • the cathode-ray beam which emanates from the cathode is deected by the deflection signal source to sweep across the portions of the wire 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.
  • thev deflect-ion signals and the intensity-control signals are being received from a suitable scanning mechanism, such as a facsimile scanner or television camera, and rif the writing paper 34 ismoved at a synchronized vertical scanning speed, a pattern of charges will be deposited on the writing paper, which, when subsequently developed, Yusing wellknown e1ec trostatic developing techniques', will producev a' Visible ⁇ image ofthe original copy.
  • a suitable scanning mechanism such as a facsimile scanner or television camera
  • the writing array of wires consists of a number of iso- It will -be appreciated-tha't-Y lated wires which have no direct current return to the cathode, except by a means of the electrical discharge which does the writing.
  • the wires are substantially parallel to one another and insulated from one another, the wire-tolwire capacity is high. Thus, an electrical discharge will continue until it has discharged the wire capacitance. Because of this, a Wire will sometimes continue to write longer than it should. Since the dielectric writing medium is always in motion, this can result -in smeared letters.
  • an improvement in writing quality is obtained by connecting each writing wire to a common electrode 38 through a high resistance.
  • Figures 4 and 5 show side and end views of a preferred arrangement for making the Writing wires for an improved target in accordance with this invention.
  • an insulator 46 which, as may -be observed from the end view, has a semicylindrical shape, there are spaced a plurality of resistance wires 50.
  • This is mounted in the face of the tube as shown in Figure 1, so that the writing points extending at one end of the semicylinder are external to the tube, and the remainder of the resistance wire is within the tube.
  • the common ground return electrode 38 is positioned to be in contact with the end of these writing wires 50, which are within the tube.
  • This type of structure may lbereadily fabricated by taking a glass-rod insulator, wrapping the resistance wire in a spiral around the insulator, cementing the Wire to the insulator, and then grinding away one-half to leave the semicylindrical shape shown in the end view of Figure 4.
  • the electron beam impinges the center section of the wire array, as may be seen in Figure 5.
  • resistancewire is meant, for example, Nichrome wire or any other wire made of a material having a resistance which is high when compared to the resistance of a conductor such as copper wire.
  • Still another method for making the array shown in Figures 4 and 5 would be to lay down a resistance film using well-known techniques in the -form of a writing array on an insulating rod and thereafter contacting one end of the resistance lnrwith the common return elec trode.
  • an electrostatic writing tube of the type having a target including a column of points at a writing surface outside said tube, an electron beam means to elevate the potential of selected ones of said points until a discharge occurs from these points to an adjacent ground plane, of a plurality of writing wires made of a material having a resistance which is high when compared to the resistance of copper wire, each of said wires extending from within said tube to a dierent one of said points, and a common electrode connected to all said writing wires and brought out from within said tube.
  • an electron beam means to elevate the potential of selected ones of said points until a discharge occurs from these points to an adjacent ground plane, of a plurality of writing wires made of a material having a resistance which is high when compared to the resistance of copper wire, each of said wires extending from within said tube to a different one of said points, a common electrode connected to all said writing wires at their end portions opposite to said points, and means to apply a bias voltage through said common electrode to all said writing Wires which is less than the point discharge potentials but above that of the adjacent ground plane.
  • an electrostatic writing tube of an improved target comprising a plurality of writing wires made of a material having a resistance which is high when compared to the resistance of copper wire, means for insulatingly supporting said writing wires spaced apart with one of their ends extending outside of said tube in a column, a common conductive electrode connecting all the other ends of said writing wires within said tube and extending outside of said tube.
  • writing wires comprise a resistive film deposited on said means for insulatingly supporting said writing wires.

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  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US713866A 1958-02-07 1958-02-07 Electrostatic writing tube Expired - Lifetime US2978607A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US713866A US2978607A (en) 1958-02-07 1958-02-07 Electrostatic writing tube
BE575458A BE575458A (fr) 1958-02-07 1959-02-06 Tube d'impression électrostatique.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US713831A US2879422A (en) 1958-02-07 1958-02-07 Electrostatic writing tube
US713866A US2978607A (en) 1958-02-07 1958-02-07 Electrostatic writing tube

Publications (1)

Publication Number Publication Date
US2978607A true US2978607A (en) 1961-04-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US713866A Expired - Lifetime US2978607A (en) 1958-02-07 1958-02-07 Electrostatic writing tube

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US (1) US2978607A (fr)
BE (1) BE575458A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3173049A (en) * 1961-08-14 1965-03-09 Burroughs Corp Printing head in cathode ray tube face
US3193907A (en) * 1960-03-22 1965-07-13 Litton Prec Products Inc High speed cathode-ray direct writing tube
US3195219A (en) * 1961-02-16 1965-07-20 American Optical Corp Energy conducting device
US3458752A (en) * 1965-04-02 1969-07-29 Burroughs Corp Method and apparatus for improving the performance of electrostatic printing tubes
US3764839A (en) * 1970-12-23 1973-10-09 Fuji Photo Film Co Ltd Thermal recording tube
US20050212868A1 (en) * 2004-03-26 2005-09-29 Radominski George Z Fluid-ejection device and methods of forming same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2273793A (en) * 1940-04-10 1942-02-17 Bell Telephone Labor Inc Cathode ray tube
US2283148A (en) * 1941-02-14 1942-05-12 Bell Telephone Labor Inc Modulation of cathode ray devices
US2829025A (en) * 1952-04-18 1958-04-01 John E Clemens High speed apparatus for recording intelligence

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2273793A (en) * 1940-04-10 1942-02-17 Bell Telephone Labor Inc Cathode ray tube
US2283148A (en) * 1941-02-14 1942-05-12 Bell Telephone Labor Inc Modulation of cathode ray devices
US2829025A (en) * 1952-04-18 1958-04-01 John E Clemens High speed apparatus for recording intelligence

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3193907A (en) * 1960-03-22 1965-07-13 Litton Prec Products Inc High speed cathode-ray direct writing tube
US3195219A (en) * 1961-02-16 1965-07-20 American Optical Corp Energy conducting device
US3173049A (en) * 1961-08-14 1965-03-09 Burroughs Corp Printing head in cathode ray tube face
US3458752A (en) * 1965-04-02 1969-07-29 Burroughs Corp Method and apparatus for improving the performance of electrostatic printing tubes
US3764839A (en) * 1970-12-23 1973-10-09 Fuji Photo Film Co Ltd Thermal recording tube
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
BE575458A (fr) 1959-05-29

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