US2619614A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2619614A
US2619614A US107286A US10728649A US2619614A US 2619614 A US2619614 A US 2619614A US 107286 A US107286 A US 107286A US 10728649 A US10728649 A US 10728649A US 2619614 A US2619614 A US 2619614A
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US
United States
Prior art keywords
spiral
cathode
tube
discharge tube
electric discharge
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
US107286A
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English (en)
Inventor
Diemer Gesinus
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust 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
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2619614A publication Critical patent/US2619614A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
    • H01J25/38—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the forward travelling wave being utilised

Definitions

  • This invention relates to electric discharge tubes of the travelling wave type for generating, amplifying or modulating waves of wave length several decimeters or less, also and to apparatus embodying such discharge tubes.
  • Known travelling wave tubes comprise a cylindrical helix within which travels an electron beam. They have a limitation in that the linear electron beam can carry little current only,
  • the invention provides a travelling wave tube of different type which is capable of operating with high current and which has additional advantages.
  • this tube comprises a cylindrical cathode, one or more cylindrical controlor screen-grids and surrounding them a gridshaped electrode, the section of which at right angles to the axis of the cathode is a spiral, the whole electrode system being surrounded by an anode.
  • the ratio between circumference and the pitch of the spiral must have a constant value.
  • the spiral electrode is therefore preferably made as a logarithmic spiral, the apertures in the spiral grid-electrode are also arranged so that when viewed from the cathode the apertures in the various turns line one behind the other and in line with the apertures in the controlor screen-grids.
  • the starting pitch of the spiral is preferably chosen to be small compared with the starting radius, whilst the optimum ratio between internal radius and external radius is equal to e, the base of the natural logarithms.
  • Fig. 1 is a sectional view of the tube, taken at right angles to the axis of the electrode system, and
  • Fig. 2 a vertical sectional View, partly in elevation, taken through the axis of the tube. The tube is shown at twice its full size.
  • l designates the glass wall of the tube, in the axis of which is arranged a cylindrical hot cathode 2 of 5 mms. diameter.
  • the hot cathode is surrounded by a control-grid 3 and a screen-grid 4.
  • the spiral electrode 5 is made of six narrow molybdenum strips 1 which are wound about eight series of stay rods to form a logarithmic spiral.
  • the stay rods for the spiral electrode lie behind the stays of the controland screen-grids, which are provided with circular rings corresponding with the strips 1.
  • the starting radius of the spiral is'9 mms. and the starting pitch 1.1 mm.
  • the spiral electrode is given a voltage of V relatively to the cathode and the anode 6 a voltage of 100V also.
  • the anode G is formed by a cylindrical metal ring.
  • the tube is intended for use in producing oscillations of about 30 cms. wavelength.
  • An electron discharge tube of the traveling wave type comprising a cathode, a grid located in the path of the electron emission from said cathode, a, traveling wave conductor encircling said grid with a pluralityof turns and having a spiral section at right angle to the axis of the cathode, and an anode surrounding said conductor, the radius Tn for the n turn of the spiral conductor being equal to ill? flue n in which a is the starting pitch and n is the starting radius.
  • An electron discharge tube of the traveling Wave type comprising a cathode, a grid located in the path of the electron emission from said cathode, a traveling wave conductor encircling said grid and having a spiral section at right angle to the axis of the cathode, the ratio between the largest radius and the smallest radius of the spiral conductor being equal to e, the base of the natural logarithms, and an anode surrounding said conductor.

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  • Microwave Tubes (AREA)
US107286A 1948-08-19 1949-07-28 Electric discharge tube Expired - Lifetime US2619614A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL277503X 1948-08-19

Publications (1)

Publication Number Publication Date
US2619614A true US2619614A (en) 1952-11-25

Family

ID=19782178

Family Applications (1)

Application Number Title Priority Date Filing Date
US107286A Expired - Lifetime US2619614A (en) 1948-08-19 1949-07-28 Electric discharge tube

Country Status (6)

Country Link
US (1) US2619614A (en, 2012)
BE (1) BE490688A (en, 2012)
CH (1) CH277503A (en, 2012)
FR (1) FR993364A (en, 2012)
GB (1) GB671422A (en, 2012)
NL (2) NL72289C (en, 2012)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1792219A (en) * 1926-02-27 1931-02-10 Siemens Ag Method of securing grid wires
DE550314C (de) * 1932-05-07 Sueddeutsche Telefon App Kabel Kathodenroehre, bei welcher Gitter oder Anode oder beide derart in der Elektronenbahn angeordnet sind, dass, von der Kathode aus gesehen, Teile des Gitters und der Anode miteinander abwechseln
US2075202A (en) * 1934-12-12 1937-03-30 Philips Nv Electron discharge tube
US2460062A (en) * 1945-11-23 1949-01-25 Philco Corp Grid controlled electron tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE550314C (de) * 1932-05-07 Sueddeutsche Telefon App Kabel Kathodenroehre, bei welcher Gitter oder Anode oder beide derart in der Elektronenbahn angeordnet sind, dass, von der Kathode aus gesehen, Teile des Gitters und der Anode miteinander abwechseln
US1792219A (en) * 1926-02-27 1931-02-10 Siemens Ag Method of securing grid wires
US2075202A (en) * 1934-12-12 1937-03-30 Philips Nv Electron discharge tube
US2460062A (en) * 1945-11-23 1949-01-25 Philco Corp Grid controlled electron tube

Also Published As

Publication number Publication date
GB671422A (en) 1952-05-07
NL141983B (nl)
BE490688A (en, 2012)
NL72289C (en, 2012)
FR993364A (fr) 1951-10-30
CH277503A (de) 1951-08-31

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