US3136917A - Electrostatic writing means - Google Patents

Electrostatic writing means Download PDF

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Publication number
US3136917A
US3136917A US14687A US1468760A US3136917A US 3136917 A US3136917 A US 3136917A US 14687 A US14687 A US 14687A US 1468760 A US1468760 A US 1468760A US 3136917 A US3136917 A US 3136917A
Authority
US
United States
Prior art keywords
dielectric
tube
interior
wires
conductors
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
US14687A
Other languages
English (en)
Inventor
Jr Joseph James Stone
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 NL262100D priority Critical patent/NL262100A/xx
Priority to BE637933D priority patent/BE637933A/xx
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US14687A priority patent/US3136917A/en
Priority to GB7890/61A priority patent/GB942213A/en
Priority to DED35631A priority patent/DE1190588B/de
Priority to FR855331A priority patent/FR1283588A/fr
Priority to US227500A priority patent/US3247517A/en
Priority to FR948570A priority patent/FR1369883A/fr
Application granted granted Critical
Publication of US3136917A publication Critical patent/US3136917A/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

  • This invention relates in general to an improved electrostatic printing arrangement, and more particularly to an arrangement for improving the resolution of images secured by means of electrostatic printing tubes.
  • a conventional cathode ray tube is modified by the provision of an array of wires in its face, which extend from the interior surface of the face to the exterior surface.
  • a high voltage beam of electrons is varied in accordance with a desired image and traverses the interior terminations of the array of wires embedded in the non-conductive face of the tube to cause a discharge through a dielectric or printing paper passing adjacent to the exterior wire terminations at a desired speed.
  • This arrangement although producing satisfactory images does give rise to some difiiculties in resolution due to the capacitive effect of the wires in the matrix.
  • the dielectric is located between the Wires and an exterior electrode maintained at ground or anode potential, while the respective wires are charged toward the cathode potential. This creates a charged condition therebetween which is satisfied only by discharge through the dielectric, and on initiation of the discharge, it continues until complete. If the discharge period is extended, it may result in poor definition of the discharge area marked on the dielectric.
  • the features of this invention include the coating of the inner surface of the face plate with a dielectric which is only penetrated by high beam current and the provision of a biased conductive layer on the coating to dissipate the secondary emission effects caused by the beam passage.
  • FIG. 1 is a standard cathode ray tube of the type used in electrostatic printing modified in accordance with the invention.
  • FIG. 2 is a partial sectional view showing the manner in which the coatings are related to a wire conductor in the electrostatic printing tube.
  • the tube indicated at 10 is similar to a conventional cathode ray tube. It includes an evacuated envelope 12, which carries a cathode 14, a control. grid 13 connected to a suitable signal source 15, an anode or accelerating electrode 16, a focus coil 18, and a deflection coil 20.
  • the cathode is cimnected to the negative terminal of high voltage supp y 22.
  • the deflection coil 20 is controlled from a suitable deflection signal source 28, for controlling the beam produced at the cathode 14 while the beam is modulated by the signals from source 15 for reproducing an image represented by those signals.
  • the tube includes any well known type of face plate 32 of dielectric material in which the wires 34 are carried or embedded. Adjacent the terminations of the wires, exterior of the tube, a suitable dielectric material 36 is provided for recording the image. It is moved in the direction indicated by the arrow and has associated on its other side a conductor 38, at ground potential whereby discharge from the wires through the dielectric is accomplished.
  • a dielectric coating 40 is provided on the inside of the tube 10 and adjacent the interior terminations of the wires 34 along the face plate 32 .
  • the coating 40 may be formed by a deposit of aluminum which is fired in a properly controlled atmosphere to form an oxide.
  • a thin conductive coating 44 is then deposited on the coating 40 and is extended to a suitable bias source such as ground. The selection of the bias is of course dependent on desired characteristics.
  • the primary beam is of course directed to the various wires 34, in accordance with the desired scanning rate, while the image reproducing dielectric 36 passes adjacent the external terminations of the wires.
  • the control grid 13 is controlled in accordance with the signals introduced thereto from signal source 15. These signals represent the object to be reproduced and modulate the beam emitted by 14 accordingly.
  • the potential source 22 furnishes a voltage of sufficient magnitude to provide a primary beam which penetrates the layers or coatings 40 and 44 to charge the Wires 34 in accordance with the modulations introduced from signal source 15.
  • Stray electrons which are being emitted from the various components of the tube 10 are prevented from penetrating the layer 40 and therefore cannot affect image resolution.
  • the secondary or stray electrons emitted as a result of the beam striking the interior terminations of wires 34 and the face plate 32 are collected along dielectric and conducted away by layer 44 to prevent a harmful charging effect of these electrons.
  • the effect of stray and secondary electrons on image resolution is reduced to provide improved image resolution.
  • An electrostatic printing tube in which a pluraltiy of conductive elements are successively scanned by a primary electron beam for recording on a dielectric, the improvement comprising a dielectric face plate in which said elements are carried in parallel and insulated one from the other, and a dielectric coating covering one surface of said face plate and which is penetrated only by said electron beam to charge said elements, in accordance with desired input signals.
  • An electrostatic printing tube in'which a plurality of conductors extend from the interiorto the exterior surface of the dielectric face of the tube and are charged successively by a primary electron beam for enabling a discharge through a dielectric recording material for re-; producing an image, the improvement comprising an alu:
  • minum oxide coating over the interior surface'of said face and the interior terminations of said conductors and penetrable only by'said beam, ahd a thin'condiictivecoating over said oxide coating and connected to a suitable bias source for collecting secondary electrons emitted by; said a i beam striking saidplate and conductors.

Landscapes

  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US14687A 1960-03-14 1960-03-14 Electrostatic writing means Expired - Lifetime US3136917A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL262100D NL262100A (US08063081-20111122-C00044.png) 1960-03-14
BE637933D BE637933A (US08063081-20111122-C00044.png) 1960-03-14
US14687A US3136917A (en) 1960-03-14 1960-03-14 Electrostatic writing means
GB7890/61A GB942213A (en) 1960-03-14 1961-03-03 Electrostatic printing tube
DED35631A DE1190588B (de) 1960-03-14 1961-03-11 Elektrostatische Kathodenstrahlschreibroehre
FR855331A FR1283588A (fr) 1960-03-14 1961-03-11 Dispositif d'écriture électrostatique
US227500A US3247517A (en) 1960-03-14 1962-10-01 Electrostatic printing system utilizing a. c. and d. c. bias
FR948570A FR1369883A (fr) 1960-03-14 1963-09-25 Procédé et dispositif d'impression électrostatique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14687A US3136917A (en) 1960-03-14 1960-03-14 Electrostatic writing means

Publications (1)

Publication Number Publication Date
US3136917A true US3136917A (en) 1964-06-09

Family

ID=21767044

Family Applications (1)

Application Number Title Priority Date Filing Date
US14687A Expired - Lifetime US3136917A (en) 1960-03-14 1960-03-14 Electrostatic writing means

Country Status (5)

Country Link
US (1) US3136917A (US08063081-20111122-C00044.png)
BE (1) BE637933A (US08063081-20111122-C00044.png)
DE (1) DE1190588B (US08063081-20111122-C00044.png)
GB (1) GB942213A (US08063081-20111122-C00044.png)
NL (1) NL262100A (US08063081-20111122-C00044.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264912A (en) * 1979-04-30 1981-04-28 Kcr, Inc. Image formation and development apparatus
US20050212868A1 (en) * 2004-03-26 2005-09-29 Radominski George Z Fluid-ejection device and methods of forming same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544690A (en) * 1946-12-26 1951-03-13 Du Mont Allen B Lab Inc Color television
US2829025A (en) * 1952-04-18 1958-04-01 John E Clemens High speed apparatus for recording intelligence
US2879422A (en) * 1958-02-07 1959-03-24 Dick Co Ab Electrostatic writing tube
US2958002A (en) * 1952-11-13 1960-10-25 Gen Electric Production of colored images
US2978607A (en) * 1958-02-07 1961-04-04 Dick Co Ab Electrostatic writing tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE923864C (de) * 1944-03-25 1955-02-21 Telefunken Gmbh Kathodenstrahlschalter, dessen einzelnen Schaltkontakten Signalstroeme zugefuehrt werden
FR971152A (US08063081-20111122-C00044.png) * 1947-10-31 1951-01-15

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544690A (en) * 1946-12-26 1951-03-13 Du Mont Allen B Lab Inc Color television
US2829025A (en) * 1952-04-18 1958-04-01 John E Clemens High speed apparatus for recording intelligence
US2958002A (en) * 1952-11-13 1960-10-25 Gen Electric Production of colored images
US2879422A (en) * 1958-02-07 1959-03-24 Dick Co Ab Electrostatic writing tube
US2978607A (en) * 1958-02-07 1961-04-04 Dick Co Ab Electrostatic writing tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264912A (en) * 1979-04-30 1981-04-28 Kcr, Inc. Image formation and development apparatus
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
DE1190588B (de) 1965-04-08
BE637933A (US08063081-20111122-C00044.png)
GB942213A (en) 1963-11-20
NL262100A (US08063081-20111122-C00044.png)

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