US2716204A - Electron discharge device with deflection electrode system - Google Patents

Electron discharge device with deflection electrode system Download PDF

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Publication number
US2716204A
US2716204A US257717A US25771751A US2716204A US 2716204 A US2716204 A US 2716204A US 257717 A US257717 A US 257717A US 25771751 A US25771751 A US 25771751A US 2716204 A US2716204 A US 2716204A
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United States
Prior art keywords
deflection
potential
plate
discharge device
electrons
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Expired - Lifetime
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US257717A
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English (en)
Inventor
Rodenhuis Klaas
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • H01J31/04—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 only one or two output electrodes with only two electrically independant groups or electrodes

Definitions

  • This invention relates to electric discharge tubes in which the electron beam is deflected by at least one deflection system, more particularly to tubes wherein tha beam is band-shaped and the deflection system comprises deflection plates whose ends are bent away from each other, the deflection system being followed by an electrode maintained at a low potential or zero potential.
  • Deflection systems notably those whose deflection plate ends remote from the cathode are bent away from each other and which are followed by an electrode which is maintained at a low potential or zero potential, suffer from the disadvantage that the primary electrons of the beam partly change their direction in front of the said electrode maintained on a low or zero potential and find their way to the deflection plates which then tend to carry current. This is particularly undesirable for a controlling deflection plate, since such a plate is connected to a control circuit so that the operation of the device is adversely affected.
  • the aforesaid phenomenon occurs more particularly at instants at which the controlling deflection plate is strongly positive so that the beam passes closely by it, and this phenomenon is still promoted by the fact that in this manner more stray electrons from the beam will find their way to the deflection plate.
  • a device comprising an electric discharge tube whose electron beam is deflected to one or more collecting electrodes by means of at least two oppositely arranged deflection plates, of which at least one is supplied with the deflection control voltage and, viewed in the direction of travel of the electrons, an electrode maintained at a low or zero potential follows the said deflection system, at least one controlling defiection plate is subdivided into several parts by one or more slits extending at right angles to the direction of travel of the electrons, of which parts at least that nearest the said electrode maintained at a low or Zero potential is supplied with a fixed positive voltage exceeding the highest positive voltage attained by the controlling parts of this deflection plate.
  • FIG. 1 designates an electron gun producing a band-shaped beam which emerges from the acceleration anode 2 and passes between the deflection plates 3 and 4, 5.
  • the deflection plate 3 a fixed positive voltage of, say, 150 volts is applied.
  • the other deflection plate consists of two parts, of which part 4 is connected to the controlling deflection voltage which may, for example, vary between and +220 volts.
  • the deflection system is followed by a grid 6 maintained at a low or zero potential, a perforated positive electrode 7, a collecting grid 8 and an anode 9.
  • the invention is particularly effective if the deflection plates are bent away from each other at the end remote from the cathode, since then the part 5, maintained at a fixed high potential, of the controlling deflection plate has little influence on the direction of the beam.
  • the influence of the part maintained at a fixed positive voltage may reach an undue value so that undesirable deviations of the beam may occur.
  • the part maintained at a fixed positive potential will then be made as narrow as possible.
  • This has, in turn, the disadvantage that the action of attraction of the returning electrons is reduced.
  • the position and construction may, however, be made such that the returning electrons are substantially directed or focussed onto the said positive part of the control electrode.
  • the deflection plates arranged opposite each other need not be of equal length.
  • the parts maintained at a fixed potential may be considered to belong to a deflection plate if these parts practically constitute a natural extension of this deflection plate.
  • the deflection plate 4, 5 may be subdivided into several parts and these parts may alternately be connected to the controlling voltage and a fixed positive voltage. If control voltages are applied to both deflection plates, both of them may advantageously be subdivided.
  • An electron discharge device comprising means at one end to produce and project a flat ribbon-shaped electron beam along a given path, an anode disposed at the other end for receiving said beam, a grid electrode disposed on the side of said anode facing said beam producing means and in the path of said beam, a pair of similar outwardly flaring deflecting plates disposed between the grid electrode and the beam producing means and symmetrically arranged on opposite sides of the path of the electron beam, at least one of said deflecting plates comprising at least two electrically-insulated portions spaced apart by a slit-shaped aperture extending in a direction perpendicular to the path of the beam including one portion adjacent the grid electrode and another portion remote from the grid electrode, means to apply a relatively low potential to said grid electrode, means to apply a relatively high potential to said anode, means to apply a beam control potential including a maximum potential to at least said other portion of said one deflecting plate, and means to apply a fixed potential exceeding said maximum potential to said one portion of said deflecting plate, whereby
  • An electron discharge device comprising means at one end to produce and project a flat ribbon-shaped electron beam along a given path, an anode disposed at the other end for receiving said beam, a grid electrode disposed on the side of said anode facing said beam producing means and in the path of said beam, a pair of similar outwardly flaring deflecting plates disposed between the grid electrode and the beam producing means and symmetrically arranged on opposite sides of the path of the electron beam, one of said deflecting plates comprising at least two electrically-insulated portions spaced apart by a slit-shaped aperture extending in a direction perpendicular to the path of the beam including one portion adjacent the grid electrode and another portion remote from the grid electrode, said one portion having a dimension parallel to the path of said beam substantially shorter than the corresponding dimension of said other portion, means to apply a relatively low potential to said grid electrode, means to apply a relatively high potential to said anode, means to apply a fixed potential to the other half of said deflecting plates, means to apply a beam control potential including
  • An electron discharge device comprising means at one end to produce and project a flat ribbon-shaped electron beam along a given path, an anode disposed at the other end for receiving said beam, a grid electrode disposed on the side of said anode facing said beam producing means and in the path of said beam, a pair of similarly outwardly flaring deflecting plates disposed between the grid electrode and the beam producing means and symmetrically arranged on opposite sides of the path of the electron beam, one of said deflecting plates comprising two electrically-insulated portions spaced apart by a slit-shaped aperture extending in a direction perpendicular to the path of the beam including one portion adjacent the grid electrode and another portion remote from the grid electrode, said two portions of said one deflecting plate constituting jointly the counterpart of the other of said deflecting plates, means to apply a zero potential to said grid electrode, means to apply a relatively high potential to said anode, means to apply a fixed potential to said other deflecting plate, means to apply a varying beam control potenial including a maximum potential

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Microwave Tubes (AREA)
  • Electron Beam Exposure (AREA)
US257717A 1950-11-27 1951-11-23 Electron discharge device with deflection electrode system Expired - Lifetime US2716204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL157562 1950-11-27

Publications (1)

Publication Number Publication Date
US2716204A true US2716204A (en) 1955-08-23

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US257717A Expired - Lifetime US2716204A (en) 1950-11-27 1951-11-23 Electron discharge device with deflection electrode system

Country Status (7)

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US (1) US2716204A (no)
BE (1) BE507380A (no)
CH (1) CH297599A (no)
DE (1) DE865765C (no)
FR (1) FR1045480A (no)
GB (1) GB714440A (no)
NL (1) NL86332C (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125699A (en) * 1964-03-17 vacuum tube with linear dynamic
US3946268A (en) * 1974-10-21 1976-03-23 American Optical Corporation Field emission gun improvement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069460A (en) * 1933-09-30 1937-02-02 Vladimir K Zworykin Cathode ray tube
US2076086A (en) * 1933-01-26 1937-04-06 Rca Corp Cathode ray tube
US2139854A (en) * 1934-12-04 1938-12-13 Firm Of Fernsch Ag Deflection system for braun tubes
US2159818A (en) * 1936-11-30 1939-05-23 Rca Corp Oscillator
US2236860A (en) * 1938-05-13 1941-04-01 Philips Nv Electron discharge device
US2273546A (en) * 1939-10-10 1942-02-17 Rca Corp Receiving system
US2553735A (en) * 1950-01-21 1951-05-22 Zenith Radio Corp Push-pull output tube

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2076086A (en) * 1933-01-26 1937-04-06 Rca Corp Cathode ray tube
US2069460A (en) * 1933-09-30 1937-02-02 Vladimir K Zworykin Cathode ray tube
US2139854A (en) * 1934-12-04 1938-12-13 Firm Of Fernsch Ag Deflection system for braun tubes
US2159818A (en) * 1936-11-30 1939-05-23 Rca Corp Oscillator
US2236860A (en) * 1938-05-13 1941-04-01 Philips Nv Electron discharge device
US2273546A (en) * 1939-10-10 1942-02-17 Rca Corp Receiving system
US2553735A (en) * 1950-01-21 1951-05-22 Zenith Radio Corp Push-pull output tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125699A (en) * 1964-03-17 vacuum tube with linear dynamic
US3946268A (en) * 1974-10-21 1976-03-23 American Optical Corporation Field emission gun improvement

Also Published As

Publication number Publication date
DE865765C (de) 1953-02-05
FR1045480A (fr) 1953-11-26
BE507380A (no)
CH297599A (de) 1954-03-31
NL86332C (no)
GB714440A (en) 1954-08-25

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