US1897255A - Discharge tube - Google Patents

Discharge tube Download PDF

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Publication number
US1897255A
US1897255A US347505A US34750529A US1897255A US 1897255 A US1897255 A US 1897255A US 347505 A US347505 A US 347505A US 34750529 A US34750529 A US 34750529A US 1897255 A US1897255 A US 1897255A
Authority
US
United States
Prior art keywords
grid
cathode
wires
metal
disc
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
US347505A
Other languages
English (en)
Inventor
Heuvelink Dirk Jan
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
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1897255A publication Critical patent/US1897255A/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
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Definitions

  • the invention is concerned with electric discharge tubes, more particularly with those comprising an incandescent cathode and a grid provided with supporting wires.
  • supporting wires is to be understood to include not only thin but also thick wires, the latter being sometimes referred to as supporting rods.
  • the grid supporting wires are often assembled so as to form a rigid unit by being soldered together.
  • This may have certain disadvantages, however, for example, when grid supporting wires consisting of a metal of high melting-point are soldered together with the aid of a metal having a lower melting-point.
  • occluded gases are set free, the vacuum in the tube being deleteriously affected by these gases.
  • soldering metal volatilizes and settles on the wall of the tube, due to which the heat radiation is made diificult.
  • the invention has for its object to provide a sturdy grid construction whereby the said disadvantages are obviated.
  • an electric discharge tube comprising an incandescent cathode and a grid with supporting wires
  • At least two of the said Wires consist of a single bent wire.
  • the grid-supporting wires which do not consist of a single wire may be secured at their bent portions to each other with the aid of metal wire. Between the bent portions of the grid supporting wires may be provided an insulating member to which the cathode may be secured, preferably elastically.
  • Fig. 1 is a perspective view of part of the grid and the cathode of a discharge tube according to the invention and Fig. 2 is a longitudinal section in the plane of the rod 7.
  • a grid 1 is helically wound on supporting wires 2, 3, 4:, and 5 made of a metal of high melting-point, for example,
  • the wires 2 and 5 on the one hand and the wires 3 and 4 on the other hand constitute a single bent wire their bent portions being secured to each other with the aid or? metal wires 6, for example, tungsten and being in efii ect a projecting end of the grid support which extends beyond the upper end of the grid.
  • an insulating rod '7 which is in eiiect mounted on the projecting end of the grid support and which consists, for example, of glass and on which a filamentary cathode 9 is hung by means of a spring 8.
  • the grid 1 is covered by a metal disc 10, which is secured to the grid sup porting wires by reason of the fact that under and above the metal disc these wires are slightly pinched.
  • a small circular plate 12 is secured to the spring 8, being arranged over an aperture 11 of the disc 10 and spaced therefrom.
  • the metal disc 10 and plate 12 prevent escape of electrons from the filament through the top of the grid.
  • the plate 12 may be slightly larger than the aperture 11. The spacing between the disc 10 and tile plate 12 permits the heat due to the filament 9 to escape without injuring the filament support.
  • an electron discharge device the combination with a looped filamentary cathode, and a grid surrounding said cathode and comprising support rods and a helix of grid wire on said rods, of a metal disc supported on said rods in position to cover one end of said helix and having a central aperture, an insulating bar mounted on said rods adjacent said disc, a filament support extending through said aperture and secured at one end to said bar, and a metal plate larger than said aperture mounted on said filament support to be over said aperture but spaced away from said disc.
  • ductive disc secured to and covering said end of sand helical electrode and having a central aperture
  • an insulator carried by the binationwith a cathode and a helical grid surrounding and coaxial with said cathode and having a grid support projecting beyond one end of said grid, of a metal disc with a central aperture on said end of said grid, an insulator mounted on said grid support adjacent said end of said grid, a cathode j ecting thru the/central aperture of said meta l disc, and a plate larger than said aper tur'e mounted on said cathode support adjacent and spaced away from said metal disc and in registry With the aperture in said disc.

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  • Solid Thermionic Cathode (AREA)
US347505A 1928-03-30 1929-03-16 Discharge tube Expired - Lifetime US1897255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1897255X 1928-03-30

Publications (1)

Publication Number Publication Date
US1897255A true US1897255A (en) 1933-02-14

Family

ID=19873254

Family Applications (1)

Application Number Title Priority Date Filing Date
US347505A Expired - Lifetime US1897255A (en) 1928-03-30 1929-03-16 Discharge tube

Country Status (3)

Country Link
US (1) US1897255A (enrdf_load_stackoverflow)
FR (1) FR669389A (enrdf_load_stackoverflow)
NL (1) NL23841C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR669389A (fr) 1929-11-15
NL23841C (enrdf_load_stackoverflow)

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