US2585057A - Electron discharge apparatus - Google Patents

Electron discharge apparatus Download PDF

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Publication number
US2585057A
US2585057A US767019A US76701947A US2585057A US 2585057 A US2585057 A US 2585057A US 767019 A US767019 A US 767019A US 76701947 A US76701947 A US 76701947A US 2585057 A US2585057 A US 2585057A
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US
United States
Prior art keywords
electrode
electrons
electron discharge
source
discharge apparatus
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
US767019A
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English (en)
Inventor
Vangeen Abraham Isidore
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope

Definitions

  • FIG. 1 A first figure.
  • This electrode is normally the output electrode (i. e. the anode). As this electrode also provides the electric field to draw the secondary electrons away from the secondary emission electrode, it is necessary for it to cover the whole active surface. On the other hand, it must produce as small an obstruction as possible to the primary current stream.
  • Fig. 1 illustrates one embodiment of the invention wherein the collector electrode comprises grid-like wires
  • Fig. 2 illustrates a modification wherein the grid wires of Fig. l are replaced by strip members.
  • the secondary emission electrode SE instead of presenting a flat surface is fluted or otherwise shaped to form a number of parallel channels, each channel being part of a circular cylinder.
  • a wire A On the centre line of each channel section, but not necessarily at the centre of curvature, is positioned a wire A extending along the channel. The wires A are connected together to form the collecting electrode. It has been found that such a structure focuses the secondary electrons on to the Wire if the dimensions are suitably chosen.
  • an envelope EN is provided within which a source of a stream of electrons such as for example a cathode K is arranged towards one end of the envelope and provides a primary stream of electrons.
  • the secondary emissive electrode SE is spaced from said source K and has a secondary emissive surface facing said source in the shape of a continuous curve which likewise faces said source.
  • the shape of this surface is such as to focus the secondary electrons at a predetermined point and the collectors A and Al are mounted in the path of said secondary electrons at said predetermined point.
  • said concave surface forms one wall of a recess and the imaginary plane IL (Fig. 1) across the open end of said surface forms the other wall of said recess.
  • the collector electrode is mounted outside said recess.
  • the construction illustrated makes it possible to use fewer wires on the anode-grid and thus decrease the number of primary electrons which are collected by the anode. This number may be still further reduced if the wires are replaced by strips Al as shown in Fig. 2 of the drawing, these strips being disposed with their width dimension preferably normal to the general plane of the emissive plate, and parallel to the assumed direction of the incident primary electrons.
  • An electron discharge device comprising a source of electrons, a secondary emissive electrode spaced from said source and having a secondary emissive surface facing said source in the shape of a continuous curve whereby secondary electrons emitted by said electrode are focussed at a predetermined point and a collector electrode mounted in the path of said secondary electrons at said predetermined point.
  • An electron discharge device comprising a source of electrons, a secondary emissive electrode spaced from said source and having a. concave secondary emissive surface in the shape of a continuous curve facing said source whereby secondaryrelectrons emitted by said electrode are focussed at a predetermined point, said concave surface forming one wall of a recess and an imaginary plane across the open end of said surface forming the other wall of said recess. and a collector electrode mounted in the path of said secondary electrons at a point outside or said recess.

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  • Microwave Tubes (AREA)
  • Electrostatic Separation (AREA)
US767019A 1939-07-28 1947-08-07 Electron discharge apparatus Expired - Lifetime US2585057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21988/39A GB532717A (en) 1939-07-28 1939-07-28 Improvements in or relating to electron discharge apparatus using secondary emission

Publications (1)

Publication Number Publication Date
US2585057A true US2585057A (en) 1952-02-12

Family

ID=10172112

Family Applications (1)

Application Number Title Priority Date Filing Date
US767019A Expired - Lifetime US2585057A (en) 1939-07-28 1947-08-07 Electron discharge apparatus

Country Status (4)

Country Link
US (1) US2585057A (en(2012))
BE (1) BE477662A (en(2012))
FR (1) FR867295A (en(2012))
GB (1) GB532717A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899577A (en) * 1957-03-27 1959-08-11 Electron discharge device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704155A (en) * 1923-07-27 1929-03-05 Albert G Thomas Vacuum tube
US2037352A (en) * 1929-01-12 1936-04-14 Rca Corp Electronic vacuum tube
US2164892A (en) * 1938-02-17 1939-07-04 Rca Corp Secondary emission tube
US2340631A (en) * 1939-06-06 1944-02-01 Adrianus J W M Van Overbeek Secondary electron amplifier
US2358542A (en) * 1940-07-26 1944-09-19 Rca Corp Currentless grid tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704155A (en) * 1923-07-27 1929-03-05 Albert G Thomas Vacuum tube
US2037352A (en) * 1929-01-12 1936-04-14 Rca Corp Electronic vacuum tube
US2164892A (en) * 1938-02-17 1939-07-04 Rca Corp Secondary emission tube
US2340631A (en) * 1939-06-06 1944-02-01 Adrianus J W M Van Overbeek Secondary electron amplifier
US2358542A (en) * 1940-07-26 1944-09-19 Rca Corp Currentless grid tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899577A (en) * 1957-03-27 1959-08-11 Electron discharge device

Also Published As

Publication number Publication date
FR867295A (fr) 1941-10-10
BE477662A (en(2012))
GB532717A (en) 1941-01-29

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