US2220089A - Gaseous discharge tube - Google Patents

Gaseous discharge tube Download PDF

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Publication number
US2220089A
US2220089A US188765A US18876538A US2220089A US 2220089 A US2220089 A US 2220089A US 188765 A US188765 A US 188765A US 18876538 A US18876538 A US 18876538A US 2220089 A US2220089 A US 2220089A
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US
United States
Prior art keywords
grid
cathode
discharge
tube
distance
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
US188765A
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English (en)
Inventor
Druyvesteyn Mari Johan
Warmoltz Nicolaas
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 US2220089A publication Critical patent/US2220089A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/50—Thermionic-cathode tubes
    • H01J17/52—Thermionic-cathode tubes with one cathode and one anode
    • H01J17/54—Thermionic-cathode tubes with one cathode and one anode having one or more control electrodes
    • H01J17/56—Thermionic-cathode tubes with one cathode and one anode having one or more control electrodes for preventing and then permitting ignition, but thereafter having no control

Definitions

  • This invention relates to gaseous discharge tubes, and more particularly to ionic relay tubes having a grid to control the discharge.
  • gaseous discharge tube means a tube whose filling comprises one or more gases or vapors, or a mixture thereof.
  • the electrodes are so proportioned and interspaced with respect to the pressure of the gaseous filling, that the discharge can be interrupted without reducing the anode voltage to zero or to a small value.
  • This effect is generally a function of the anode voltage applied to the tube and of the amount of anode current flowing at the time of interruption, and the tube is so designed that the positive ion sheaths occurring at adjacent portions of the negativelycharged control grid contact with each other and with the electrons of the discharge passing through the grid aperture in question. As a result, the passage of discharge current at this point is completely interrupted.
  • the above results may be obtained conveniently'by using a grid of wire mesh whose apertures have a maximum width of about 0.4 mm., andby using an argonfilling having a pressure during operation of not more than 0.7 mm. of mercury, or a filling of another rare gas, vapor or mixture thereof at such pressure that of the atoms isobtained.
  • a particularly advantageous electrode arrangement is obtained when using a grid-cathode distance of 2 to 4 mm.
  • the tube illustrated in the drawing comprises a glass envelope l havinga pinch 6.
  • a lead-support 8 Supported from the pinch 6 by a lead-support 8 is an indirectly-heated cathode body 2 whose outer surface is provided with a suitable electron-emissive substance, and a heating element 3 having leads 9 and I0.
  • Located at a relatively large distance from the grid 4 and supported from pinch 6 by lead supports l2 are two plate-shaped anodes 5.
  • a second D. C.-supply I 6 is connected, with its positive terminal to the oathode 2, its negative terminal being connected, through a limiting resistance 11, to a switching key 18, the condenser l9 being permanently kept at the potential of the D. C.-supply l6.
  • the condenser communicates a negative impulse to the grid 4, thus interrupting the main discharge from the anodes 5, against the full pressure of .the D. C.-supply I 3.
  • the lead-in conductor 9 of the heater 3 is directly connected to the cathode lead, whereas the lead-in conductor I0 is connected, through the limiting resistance 20, to the positive terminal of the D. C.-supply l3.
  • ode currents of 500 mA. can be interrupted in a reliable manner.
  • An ionic relay tube comprising an envelope, an anode and a cathode within said envelope and spaced apart to form a discharge space, a gaseous filling, and an apertured extinguishing grid adapted to be negatively charged between said anode and cathode and'disposed from the cathode a distance materially greater than the maximum 7 thickness dmax of the normal cathodic dark space, the distance dmax equaling 1.74X l0- i cms. in which i is the current density in amperes per sq. cm. of the discharge at the cathode surface, the cathodic dark space of the tube extending with its outer limits reaching the openings of said grid at the values of operating current density of the tube and completely filling the portion of the discharge space between said cathode and grid.
  • An ionic relay tube comprising an envelope, an anode and a cathode within said envelope and spaced apart to form a discharge space, a
  • An ionic relay tube comprising an envelope, an anode and a cathode within said envelope and spaced apart to form a' discharge space, a gaseous filling within said envelope, and an apertured extinguishing electrode adapted to be negatively charged and separating said anode and cathode and spaced from said cathode by a distance of from 2 to 4 mm., the cathodic dark space of the tube extending with its outer limit reaching the apertures of said grid at the values of current density for which said tube is designed.

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Lasers (AREA)
  • Catching Or Destruction (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US188765A 1937-02-09 1938-02-04 Gaseous discharge tube Expired - Lifetime US2220089A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN40353D DE730148C (de) 1937-02-09 1937-02-09 Ionenrelaisroehre

Publications (1)

Publication Number Publication Date
US2220089A true US2220089A (en) 1940-11-05

Family

ID=25759287

Family Applications (1)

Application Number Title Priority Date Filing Date
US188765A Expired - Lifetime US2220089A (en) 1937-02-09 1938-02-04 Gaseous discharge tube

Country Status (7)

Country Link
US (1) US2220089A (enrdf_load_stackoverflow)
BE (1) BE426216A (enrdf_load_stackoverflow)
CH (1) CH202955A (enrdf_load_stackoverflow)
DE (1) DE730148C (enrdf_load_stackoverflow)
FR (1) FR833343A (enrdf_load_stackoverflow)
GB (1) GB500459A (enrdf_load_stackoverflow)
NL (1) NL51718C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975319A (en) * 1951-03-06 1961-03-14 Tesla Np Tacttron

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975319A (en) * 1951-03-06 1961-03-14 Tesla Np Tacttron

Also Published As

Publication number Publication date
GB500459A (en) 1939-02-09
BE426216A (enrdf_load_stackoverflow) 1938-03-31
DE730148C (de) 1943-01-07
CH202955A (de) 1939-02-15
NL51718C (enrdf_load_stackoverflow) 1941-12-15
FR833343A (fr) 1938-10-19

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