US3136917A - Electrostatic writing means - Google Patents
Electrostatic writing means Download PDFInfo
- 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
Links
- 238000000576 coating method Methods 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 8
- 238000010894 electron beam technology Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
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)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL262100D NL262100A (lm) | 1960-03-14 | ||
BE637933D BE637933A (lm) | 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 (lm) |
BE (1) | BE637933A (lm) |
DE (1) | DE1190588B (lm) |
GB (1) | GB942213A (lm) |
NL (1) | NL262100A (lm) |
Cited By (2)
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)
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)
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 (lm) * | 1947-10-31 | 1951-01-15 |
-
0
- BE BE637933D patent/BE637933A/xx unknown
- NL NL262100D patent/NL262100A/xx unknown
-
1960
- 1960-03-14 US US14687A patent/US3136917A/en not_active Expired - Lifetime
-
1961
- 1961-03-03 GB GB7890/61A patent/GB942213A/en not_active Expired
- 1961-03-11 DE DED35631A patent/DE1190588B/de active Pending
Patent Citations (5)
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)
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 (lm) | |
GB942213A (en) | 1963-11-20 |
NL262100A (lm) |
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