US1893953A - Electron valve with centered heater - Google Patents

Electron valve with centered heater Download PDF

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Publication number
US1893953A
US1893953A US301965A US30196528A US1893953A US 1893953 A US1893953 A US 1893953A US 301965 A US301965 A US 301965A US 30196528 A US30196528 A US 30196528A US 1893953 A US1893953 A US 1893953A
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United States
Prior art keywords
cathode
heater
insulating
metallic
tube
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Expired - Lifetime
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US301965A
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English (en)
Inventor
Loewe Siegmund
Romhild Edgar
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Individual
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Individual
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    • 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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Definitions

  • the invention relates to a centering device, especially in electron valves, which. is of advantage under difficult conditions.
  • the heating wire is surrounded by so thin a cylindrical tube that a centering of the wire in the tube can only be effected with difficulty.
  • the heating wirein order to obtain a good heat inertia is selected of not toosmall a diameter. In this manner the margin between the surface of the heater and the inside of the cathode tube is only very small,
  • the diameter of the heater was 0.2 mm and the internal diameter of the surrounding tube (equipotential cathode) 0.6 mm.
  • the diameter of the heater was 0.2 mm and the internal diameter of the surrounding tube (equipotential cathode) 0.6 mm.
  • the conditions are similar with such narrow cathode tubes surrounding a heater which by electron bombardment are to be brought to a temperature even higher than the temperature of the heating wire.
  • an insulating ring is inserted at some places of the heating wire, especially at its two ends, which does in no manner impair either the heat radiation or the electron course over the main length of the heater which, however, with especially good centric finish may exercise at least the same centering effect as an insulating tube.
  • an insulating tube which is to be introduced into the inside of the cathode tube to be insulated and into the inside of which a wire is to be coaxially inserted, may in view of the inexactitudes in the cylinder symmetry not be executed of so firm a fit as the two insulating rings according to the invention which are to be arranged at the ends of the tubes.
  • a special advantage of the indirect heating may be achieved if it is possible to well insulate the heater from the cathode and in its manner to make the cathode independent of the variations in the a. c. voltages.
  • the insulator is not arranged in the immediate proximity of the hot elements, but taken to a distant point of such temperature with which the insulating resistance of the material concerned still possesses a sufficiently high value.
  • This is preferably eifected in the manner that the insulation material possesses a larger diameter than the cathode tube in order to increase the heat radiating off surface and for reducing the temperature of the insulation material.
  • Fig. 1 shows a section of an electron tube with the cathode according to the invention.
  • Fig. 2 illustrates another form of the centering device for the heater of an indirectly heated cathode.
  • Fig. 3 shows the face of the centering device on a larger scale.
  • Fig. 1 there is 1 the heating wire, 2 a cathode, 3 the above mentioned plugs of insulating material according to the first embodiment of the invention. T he other parts of the electron tube are drawn in a well known manner.
  • Fig. 2 a further embodiment of the invention is illustrated.
  • the heater 1 is provided with a ring 5 supported in the form of rays.
  • the cathode cylinder is provided with a ring 7 supported by similar spokes 6.
  • a mica disc 8 is clamped which is thus held by the rings 5 and 7 that its inner edge 9 does not touch the heater.
  • Fig. 3 discloses the execution of such centering device, looked upon from the side on a larger scale. It shows at the same time that the spokes 4 and 6 for the two holding rings do not lie opposite one another. The extensions of the spokes grip round the insulating wire and thus favour a good support.
  • a plate 4, 5 is welded on one side, say at the right side.
  • the plate 4, 5 may be made of the same material of which the cathodic cylinder is made.
  • the elongations of the spokes 4 of the ring 5 are turned in such a way as to fasten it to the insulating ring 8.
  • a plate 6, 7 is fastened on the right side of the cathode to the other side of the same insulating plate 8 in the" same manner.
  • the two metallic plates 4, 5 and 6, 7, the insulating plate 8, and a thorn 11 is introduced in the interior from the open side, that is to say from the left to the right. It is important that the diameter of the thorn 11 is as great as the interior diameter of the cathodio cylinder.
  • the thorn 11 has a small point to the right side of the same diameter as the hole shall have, which is to be made to the plate 7.
  • This hole is made by sticking or drilling the thorn 11 through the middle part of the ring 7 from the interior 2 until the thorn 11 has the situation as indicated at the right side of Fig.4: by means of dotted lines.
  • the whole inner surface of the cathodic cylinder is used as centering surface and therefore centering maybe made most exactly.
  • the temperature conditions with such embodiment of the invention may, for instance, be as follows:
  • the wire may be at a temperature of 2000, thecathode having a temperature of 700.
  • the main insulating task is entrusted to the outer portion 10 of the mica disc.
  • Such outer portion is from the side of wire 1 and of tube 2 connected only by the long paths of the spokes 4; and 6, respectively. It is therefore at so low a temperature that the insulating resistance is still agood one and that the crystalline properties of the mica also do not undergo any disturbing changes. Even if the inner edge 9 owing to the proximity of the heater should reach a higher temperature, the properties of this point do not impair the insulating power.
  • spokes 4 and 6 being displaced against one another, a further advantage of the arrangement is accomplished both regarding the heat transition and in electric respects.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element, a metallic body mounted on each end of the heater element, a metallic body mounted on each end of the cathode tube and two insulating bodies, each arranged between one of said first mentioned metallic bodies and one of said second mentioned metallic bodies.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element, a metallic body mounted on each end of the heater element, a metallic body mounted on each end of the cathode tube and two discs of insulating material, each arranged between one of said first mentioned metallic bodies and one of said second mentioned metallic bodies.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element a metallic disc mounted on each end of the heater element and being provided with a ring supported by radial spokes, a metallic body mounted on each end of the cathode tube and two insulating bodies, each arranged between one of said metallic discs and one of said metallic bodies.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element, a metallic disc mounted on each end of the heater element and being provided with a ring supported by radial spokes, a metallic disc member mounted on each end of the cathode tube and being provided with a ring supported by radial spokes and two insulating bodies, each arranged between one of said discs and one of said disc members.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element, a metallic disc mounted on each end of the heater element and being provided with a ring supported by radial spokes, a metallic disc member mounted on each end of the cathode tube and being provided with a ring supported by radial spokes, and two discs of insulating material, each disc being clamped between the spokes of one of said first mentioned discs and the spokes of one of said second mentioned discs.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube surrounding said heater element, a metallic disc mounted on each end of the heater element and being provided with a ring supported by radial spokes, a metallic disc member mounted on each end of the cathode tube and being provided with a ring supported by radial spokes, and two mica discs, each mica disc being clamped between the spokes of one of said first mentioned discs and the spokes of one of said second mentioned discs.
  • an indirectly heated cathode consisting of a heater element, a cylindrical metallic cathode tube signatures.

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  • Electron Sources, Ion Sources (AREA)
  • Microwave Tubes (AREA)
US301965A 1927-08-31 1928-08-25 Electron valve with centered heater Expired - Lifetime US1893953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE296415X 1927-08-31

Publications (1)

Publication Number Publication Date
US1893953A true US1893953A (en) 1933-01-10

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ID=6090372

Family Applications (1)

Application Number Title Priority Date Filing Date
US301965A Expired - Lifetime US1893953A (en) 1927-08-31 1928-08-25 Electron valve with centered heater

Country Status (4)

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US (1) US1893953A (enrdf_load_stackoverflow)
FR (1) FR659799A (enrdf_load_stackoverflow)
GB (1) GB296415A (enrdf_load_stackoverflow)
NL (1) NL26845C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB296415A (en) 1929-08-01
FR659799A (fr) 1929-07-03
NL26845C (enrdf_load_stackoverflow)

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