US2227046A - Electron valve - Google Patents

Electron valve Download PDF

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Publication number
US2227046A
US2227046A US50760A US5076035A US2227046A US 2227046 A US2227046 A US 2227046A US 50760 A US50760 A US 50760A US 5076035 A US5076035 A US 5076035A US 2227046 A US2227046 A US 2227046A
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United States
Prior art keywords
insulating tube
equipotential surface
tube member
equipotential
metallic
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Expired - Lifetime
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US50760A
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Waldschmidt Ernst
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LOEWE RADIO Inc
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LOEWE RADIO Inc
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Publication date
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Priority to US50760A priority Critical patent/US2227046A/en
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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

  • an equipotential layer provided onthe insulating member, and an emissive coating provided on the equipotential layer, which coating may consist, for example, of an alkaline earth exide or of oxidized tungsten, and be activated or made capable of emission by the application, by atomization, of barium.
  • the subject matter of the invention is a cathode, in which these disturbances are avoided.
  • the cathode is formed in such fashion that the coating of atomized activating material formed outside of the actual emissive area is unable to act in disturbing fashlOIl.
  • the equipotential surface consists of two tubes fitted one within the other, one of the tubes being longer than the other.
  • the equipotential surface consists of two tubes fitted one within the other.
  • the outer tube 2 is longer than the inner tube 6.
  • l is the highly emissive coating
  • 3 the insulating tube and 4 the filaments with the current leads 5, 9 and Ill two electrodes, e. g. grid and anode.
  • a metallic coating formed on the ends of the insulating tube is unable to cause shunts, because no emissive layer will be deposited on the part I of the insulating tube between the ends of the tubes 2 and 6.
  • said cathode comprising an elongated heater element, an insulating tube member completely surrounding the heater element, a first metallic equipotential surface surrounding the insulating tube member having a length materially less than the length of the insulating tube member, the ends of said first metallic surface being spaced substantially equidistant from the ends of the insulating tube member, a second metallic equipotential surface surrounding the first metallic equipotential surface having a length greater than the length of said, first equipotential surface and less than the length of the insulating tube member, the ends of said second metallic equipotential surface being spaced substantially equidistant from the ends of the insulatin tube member and from the ends of the first equipotential surface, and a layer of electron emissive material deposited on the outer surface of said second equipotential surface whereby a portion of said insulating tube member extending beyond the ends of said first equipotential surface will be shielded by said second equipot
  • An electron valve containing an indirectly heated cathode, control electrode and output electrode, said cathode comprising an elongated heater element, an insulating tube member completely surrounding the heater element, a first metallic equipotential surface surrounding the insulating tube member having a length materially less than the length of the insulating tube member, the ends of said first metallicsurface being spaced substantially equidistant from the ends of the insulating tube member, a sec-" ach other, and a layer of electron emissive ma- I terial deposited on the outer surface of said second equipotential surface whereby a portion of said insulating tube member extending beyond the ends of said first equipotential surface will be shielded by said second equipotential surface.

Description

Dec. 31, 1940. N A m I 2,227,046
ELECTRON VALVE Original Filed Jan. 31, 1933 Patented Dec. 31, 1940 ELECTRON VALVE Ernst Waldschmidt, Berlin, Germany, assignor, by mesne assignments, to Loewe Radio, Inc., a corporation of New York Original application January 31, 1933, Serial No.
654,378. Divided and this application November 20, 1935, Serial No. 50,760.
February 2, 1932 2 Claims.
sulating member surrounding the heating element, an equipotential layer provided onthe insulating member, and an emissive coating provided on the equipotential layer, which coating may consist, for example, of an alkaline earth exide or of oxidized tungsten, and be activated or made capable of emission by the application, by atomization, of barium.
It has been found that cathodes of this nature are frequently accompanied by acoustical disturbances, such as humming noises and the like. Thorough investigations have shown these disturbances to be created by the fact that in the course of production of the cathodes above referred to the metallic vapor is deposited not only on the highly emissive layer to be activated, but on the insulating member as well. By reason of this deposit located outside of the actual highly emissive layer shunts are produced, and there is caused a detrimental subsidiary emission. The present application is a divisional application of application Ser. No. 654,378 filed January 31, 1933, describing the same matter.
The subject matter of the invention is a cathode, in which these disturbances are avoided. According to the invention, the cathode is formed in such fashion that the coating of atomized activating material formed outside of the actual emissive area is unable to act in disturbing fashlOIl.
It has been found that these sources of error may be avoided, if the equipotential layer is so formed and arranged, that the coating produced at the ends of the insulating tube are unable to cause shunts.
According to the invention the equipotential surface consists of two tubes fitted one within the other, one of the tubes being longer than the other.
An embodiment of the invention is illustrated in the drawing.
In the drawing the equipotential surface consists of two tubes fitted one within the other.
' The outer tube 2 is longer than the inner tube 6.
l is the highly emissive coating, 3 the insulating tube and 4 the filaments with the current leads 5, 9 and Ill two electrodes, e. g. grid and anode. Owing to this particular form of the equipotential layer a metallic coating formed on the ends of the insulating tube is unable to cause shunts, because no emissive layer will be deposited on the part I of the insulating tube between the ends of the tubes 2 and 6.
I claim:
In Germany 1. An electron valve containing an indirectly.
heated cathode, control electrode and output electrode, said cathode comprising an elongated heater element, an insulating tube member completely surrounding the heater element, a first metallic equipotential surface surrounding the insulating tube member having a length materially less than the length of the insulating tube member, the ends of said first metallic surface being spaced substantially equidistant from the ends of the insulating tube member, a second metallic equipotential surface surrounding the first metallic equipotential surface having a length greater than the length of said, first equipotential surface and less than the length of the insulating tube member, the ends of said second metallic equipotential surface being spaced substantially equidistant from the ends of the insulatin tube member and from the ends of the first equipotential surface, and a layer of electron emissive material deposited on the outer surface of said second equipotential surface whereby a portion of said insulating tube member extending beyond the ends of said first equipotential surface will be shielded by said second equipotential surface.
2. An electron valve containing an indirectly heated cathode, control electrode and output electrode, said cathode comprising an elongated heater element, an insulating tube member completely surrounding the heater element, a first metallic equipotential surface surrounding the insulating tube member having a length materially less than the length of the insulating tube member, the ends of said first metallicsurface being spaced substantially equidistant from the ends of the insulating tube member, a sec-" ach other, and a layer of electron emissive ma- I terial deposited on the outer surface of said second equipotential surface whereby a portion of said insulating tube member extending beyond the ends of said first equipotential surface will be shielded by said second equipotential surface.
ERNST WAIDSCHMIDT.
US50760A 1933-01-31 1935-11-20 Electron valve Expired - Lifetime US2227046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US50760A US2227046A (en) 1933-01-31 1935-11-20 Electron valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65437833A 1933-01-31 1933-01-31
US50760A US2227046A (en) 1933-01-31 1935-11-20 Electron valve

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577239A (en) * 1949-09-12 1951-12-04 Eitel Mccullough Inc Cathode and heater structure for electron tubes
US2753480A (en) * 1952-10-11 1956-07-03 Rca Corp Indirectly heated cathode structure and method of assembly
US4100449A (en) * 1976-04-05 1978-07-11 Rca Corporation Uniform filament and method of making the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577239A (en) * 1949-09-12 1951-12-04 Eitel Mccullough Inc Cathode and heater structure for electron tubes
US2753480A (en) * 1952-10-11 1956-07-03 Rca Corp Indirectly heated cathode structure and method of assembly
US4100449A (en) * 1976-04-05 1978-07-11 Rca Corporation Uniform filament and method of making the same

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