US2271985A - Electron discharge device - Google Patents

Electron discharge device Download PDF

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Publication number
US2271985A
US2271985A US292971A US29297139A US2271985A US 2271985 A US2271985 A US 2271985A US 292971 A US292971 A US 292971A US 29297139 A US29297139 A US 29297139A US 2271985 A US2271985 A US 2271985A
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US
United States
Prior art keywords
electrons
electron
mirror
electrode
velocities
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
US292971A
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English (en)
Inventor
Morton George Ashmun
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.)
RCA Corp
Original Assignee
RCA Corp
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 NL58884D priority Critical patent/NL58884C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US292971A priority patent/US2271985A/en
Priority to CH236657D priority patent/CH236657A/de
Application granted granted Critical
Publication of US2271985A publication Critical patent/US2271985A/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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/04—Electron multipliers
    • H01J43/06—Electrode arrangements
    • H01J43/08—Cathode arrangements

Definitions

  • This invention relates to electron discharge devices and to methods of operating the same and has for its principal object to provide an electron tube the operation of which is characterized by a high ratio of transconductance to current.
  • Another and important object of the present invention is to provide a grid controlled electron discharge tube incorporating a simplified ltering device which is operable without the use of an auxiliary magnet.
  • Figure 1 is a longitudinal sectional View oi a three element electron mirror which will be referred to in explaining the principle of the invention
  • Figures 2, 3 and 4 are curves illustrative of the electron filtering action of the device of Fig. l.
  • Figure 5 is a sectional View of a grid controlled electron multiplier device incorporating an electron mirror which is constructed and arranged in accordance with the principle o the invention.
  • FIG. 1 in the form of three cylinders, I, 2 and 3, respectively, which are arranged in spaced relation along a common axis.
  • the terminal cylinders l and 3 are each maintained at a potential higher than that of the central cylinder 2 an electrostatic iield having equipotential surfaces similar to those indicated by the dotted lines will be generated.
  • the device of Fig. 1 may be said to have a dual function, i. e., it serves as an electron mirror for the low velocity electrons B and as an electron lens for passing and focusing the higher velocity electrons C to and upon the collecting surface 3a.
  • one or more electron multiplier stages may be provided intermediate the control stage and the output electrode.
  • Fig. 5 shows the invention as embodied in an electron multiplier of the electrostatic type disclosed in copending application to Rajchman and Pike, Serial No. 171,916, namelyd October 30, 1937 (now U. S. Patent 2,231,682, issued February 11, 1941).
  • an evacuated tube having a body portion I and dependent Mounted at the knee of the tube to one side of the central axis of the dependent neck Illa is a thermionic cathode 4I partially surrounded by a shield 5 which has an exit aperture 5a directed downwardly toward the open .end of the electron mirror elements I, 2 and 3.
  • the electron multiplier device which is mounted in the body section of the tube comprises two sets (i. e., upper and 1ower) of substantially L- shape multiplying electrodes II to I1, inclusive, g
  • the cathode shield 5 and the apertured electrode 'I should ordinarily be maintained at approximately the same potential, say, three volts positive with respect to the cath-ode.
  • the first (I) and the last (3) of the mirror cylinders may be main- A tained at a potential a few Volts, say two volts, positive with respect to the cathode, in which case the middle cylinder 2 should be adjusted to a potential which is slightly (say 0.1 volt) negative with respect to the cathode.
  • the multiplying stages may be operated in the usual manner, that is to say, the potential applied to each of the electrodes II to I8, inclusive, should be higher than that of the next preceding electrode.
  • the potential applied to electrode II is 100 volts positive with respect to the cathode
  • the potential applied to electrode I2 may be 200 volts and that applied to the electrode I3y 300 volts, and so on for as many stages as desired.
  • the path of the high velocity electrons extends along the path C from the cathode 4 through the mirror to the closure 3a on the last mirror cylinder where they are effectively llost.
  • the path of the low velocity electrons which are reflected from the mirror is indicated by the dotted une B.
  • the grid electrode may be dispensed with and the mirror itself used as the control element.
  • the mirror itself used as the control element.
  • controlling Voltage is preferably applied to the central mirror electrode 2.
  • Method of operating an electron discharge device which comprises generating a stream of electrons having various velocities, generating an electrostatic eld comprising equipotential surfaces adapted to reflect electrons of certain of said velocities and to pass the electrons of other velocities, directing said electron stream toward said electrostatic eld, separately collecting the reflected and the passed of ⁇ said electrons and subjecting the reected electrons to a controlling potential prior to their collection.
  • Method of operating an electron discharge device which comprises generating a stream of electrons having various velocities, generating an electrostatic eld capable of reflecting back, in the direction of their origin, the electrons of lower velocities and to pass the higher velocity electrons, directing said electron stream upon said electrostatic field, collecting the passed electrons, subjecting the reected electrons to a control potential and then collecting said reected electrons.
  • An electron discharge device comprising a cathode adapted to release electrons having various velocities, an electron mirror accessible to all of said electrons, said mirror being adapted to reflect electrons having certain velocities and to pass electrons having other velocities, and a control electrode mounted in the path of said reflected electrons.
  • An electron discharge device comprising a cathode adapted to release electrons having various velocities, an electron mirror accessible to all of said electrons, said mirror being adapted to reflect electrons having certain velocities and to pass electrons having other velocities, a control electrode mounted in the path of said reflected electrons and an electrode surface upon which said other electrons impinge.
  • An electron discharge device comprising a cathode adapted to release electrons having various velocities, an electron mirror comprising a plurality of electrodes mounted in spaced relation in the path of said electrons and provided with electrode leads for establishing an electrostatic eld among said electrodes capable of reflecting back, in the direction of their origin, the electrons of lower velocities and of passing the higher velocity electrons, an electron multiplying electrode and means for directing said reilected electrons to said multiplying electrode.
  • one of said mirror electrodes comprises a control electrode.

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US292971A 1939-09-01 1939-09-01 Electron discharge device Expired - Lifetime US2271985A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL58884D NL58884C (US06262066-20010717-C00424.png) 1939-09-01
US292971A US2271985A (en) 1939-09-01 1939-09-01 Electron discharge device
CH236657D CH236657A (de) 1939-09-01 1941-04-02 Vorrichtung mit einer elektrischen Entladungsröhre, in welcher eine Geschwindigkeitsaussortierung der Elektronen erfolgt.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US292971A US2271985A (en) 1939-09-01 1939-09-01 Electron discharge device

Publications (1)

Publication Number Publication Date
US2271985A true US2271985A (en) 1942-02-03

Family

ID=23127039

Family Applications (1)

Application Number Title Priority Date Filing Date
US292971A Expired - Lifetime US2271985A (en) 1939-09-01 1939-09-01 Electron discharge device

Country Status (3)

Country Link
US (1) US2271985A (US06262066-20010717-C00424.png)
CH (1) CH236657A (US06262066-20010717-C00424.png)
NL (1) NL58884C (US06262066-20010717-C00424.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442848A (en) * 1942-03-09 1948-06-08 Farnsworth Res Corp Electron control tube
US2465342A (en) * 1941-07-28 1949-03-29 Int Standard Electric Corp Electronic discharge device
US2762916A (en) * 1950-07-13 1956-09-11 Hartford Nat Bank & Trust Co Device comprising an electric discharge tube having a concentrated electron beam
US3080500A (en) * 1959-06-22 1963-03-05 Philco Corp Cathode ray system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465342A (en) * 1941-07-28 1949-03-29 Int Standard Electric Corp Electronic discharge device
US2442848A (en) * 1942-03-09 1948-06-08 Farnsworth Res Corp Electron control tube
US2762916A (en) * 1950-07-13 1956-09-11 Hartford Nat Bank & Trust Co Device comprising an electric discharge tube having a concentrated electron beam
US3080500A (en) * 1959-06-22 1963-03-05 Philco Corp Cathode ray system

Also Published As

Publication number Publication date
NL58884C (US06262066-20010717-C00424.png)
CH236657A (de) 1945-02-28

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