US1748386A - Electric discharge tube - Google Patents
Electric discharge tube Download PDFInfo
- Publication number
- US1748386A US1748386A US146186A US14618626A US1748386A US 1748386 A US1748386 A US 1748386A US 146186 A US146186 A US 146186A US 14618626 A US14618626 A US 14618626A US 1748386 A US1748386 A US 1748386A
- Authority
- US
- United States
- Prior art keywords
- cathode
- electrons
- electric discharge
- discharge tube
- primary
- 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
Links
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000941 radioactive substance Substances 0.000 description 3
- 241000282320 Panthera leo Species 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes
-
- 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
- H01J1/30—Cold cathodes, e.g. field-emissive cathode
Definitions
- This invention relates to a cathode and more particularly to a cathode for use in a vacuum tube.
- Figure 1 represents such a device wherein electrons leave a secondary cathode at an obtuse angle
- Figure 2 shows another form of the device wherein electrons leave the secondary cathode at right angles
- Figure 3 shows still another form of the device wherein a multiple electron flow from a secondary cathode is obtained.
- a cylindrical metallic tube 1 ( Figure l) is covered with an oxide film, for example, barium oxide, and if in the axis of this tube, say, below the same, a small quantity of a radio-active substance 2 is arranged, the primary electrons emitted from 2 at a high rate of velocity will strike the inner surface of the said tube, and cause the emission of an abundant number of secondary electrons from 1, which are conveyed to a cylindrical anode 3 which is kept at a higher potential than the cathode 1.
- the oxide coated cathode 1 should be at a positive potential with relation to the primary electron source 2.
- the said slight quantity of radioactive substance may be confined within a metal cup, made, for example, of aluminum.
- Anode 3 proper is connected with cathode l by a still higher potential and the consumer V. It is evident that control grids having the shape of a sieve or a network or the like, as indicated at 4, may be used.
- An envelope for the thermionic device is shown schematically at 10.
- 2 indicates a feeble primary electron source
- 3 is a thin aluminum plate, or foil, e. g., of circular form which at the side furthest away from the primary cathode 2 is coated with an oxide 8.
- the anode is indicated in Figure 2 by 5.
- the cathoderays ejected from the primary cathode 2 enetrate the thin aluminum layer 3 an are shot into the oxide mixture 8, releasing from the latter a large number of secondary electrons of lower speed so that the resultant co electron current has an order of magnitude required for practical purposes.
- radio-active substances which by virtue of atomic decomposition emit primary electrons at a high rate of velocity, are used as cathode-ray sources 2, battery B shown in Figures 1 and 2 may be dispensed with.
- the anode is here arranged as a neutral cylinder 6, while the secondary cathode consists of a row of plates connected in parallel and coated with a layer of oxide 8.
- the primary cathode 2 has the shape of an annular disk. Primary electrons are radiated off in all directions, but principally in an upward direction. They impact upon the parts of the secondary cathodes, simultaneously and consecutively, in other words, they partly pass clear that these systems may be enclosed in 95 vacuum tubes, 'or in tubes containing a rarefied gaseous atmosphere, as is done in certam electron tubes.
Landscapes
- Electron Sources, Ion Sources (AREA)
Description
This invention relates to a cathode and more particularly to a cathode for use in a vacuum tube.
It is an object of this invention to provide a device for emitting electrOns in a sutficiently copious quantity for various purposes.
In the accompanying drawing Figure 1 represents such a device wherein electrons leave a secondary cathode at an obtuse angle; Figure 2 shows another form of the device wherein electrons leave the secondary cathode at right angles; and Figure 3 shows still another form of the device wherein a multiple electron flow from a secondary cathode is obtained.
When the interior surface of a cylindrical metallic tube 1 (Figure l) is covered with an oxide film, for example, barium oxide, and if in the axis of this tube, say, below the same, a small quantity of a radio-active substance 2 is arranged, the primary electrons emitted from 2 at a high rate of velocity will strike the inner surface of the said tube, and cause the emission of an abundant number of secondary electrons from 1, which are conveyed to a cylindrical anode 3 which is kept at a higher potential than the cathode 1. Of course, it is necessary that the oxide coated cathode 1 should be at a positive potential with relation to the primary electron source 2. The said slight quantity of radioactive substance may be confined within a metal cup, made, for example, of aluminum. It is connected with the secondary cathode 1 by way of a certain potential (battery B) preferably above 10 volts. Anode 3 proper is connected with cathode l by a still higher potential and the consumer V. It is evident that control grids having the shape of a sieve or a network or the like, as indicated at 4, may be used. An envelope for the thermionic device is shown schematically at 10.
In Figure 1 the primary electrons impact upon the oxide surface from which they pull out secondary electrons at an obtuse angle, but this angle, as shown in Figure 2, can also be made of 90 degrees so that the impacting will occur perpendicularly.
In Figure 2, 2 indicates a feeble primary electron source, 3 is a thin aluminum plate, or foil, e. g., of circular form which at the side furthest away from the primary cathode 2 is coated with an oxide 8. The anode is indicated in Figure 2 by 5. The cathoderays ejected from the primary cathode 2 enetrate the thin aluminum layer 3 an are shot into the oxide mixture 8, releasing from the latter a large number of secondary electrons of lower speed so that the resultant co electron current has an order of magnitude required for practical purposes.
If radio-active substances, which by virtue of atomic decomposition emit primary electrons at a high rate of velocity, are used as cathode-ray sources 2, battery B shown in Figures 1 and 2 may be dispensed with.
In the arrangement shown in Figure 3, the release of secondary cathode-rays is produced in a multiple manner. The anode is here arranged as a neutral cylinder 6, while the secondary cathode consists of a row of plates connected in parallel and coated with a layer of oxide 8. The primary cathode 2 has the shape of an annular disk. Primary electrons are radiated off in all directions, but principally in an upward direction. They impact upon the parts of the secondary cathodes, simultaneously and consecutively, in other words, they partly pass clear that these systems may be enclosed in 95 vacuum tubes, 'or in tubes containing a rarefied gaseous atmosphere, as is done in certam electron tubes.
Having thus described my invention, I ma claim The individual electrons pass It is In combination a cylindrical anode, an annular cold cathode coated with a, radio active material emitting primary electrons and a, series of oxide coated plates connected in parallel and mounted in the path of the primary electrons emitted from said annular cathode, and designed to have secondary electrons flow therefrom to said cylindri al anode.
SIEGMUND
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1748386X | 1925-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1748386A true US1748386A (en) | 1930-02-25 |
Family
ID=7741650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US146186A Expired - Lifetime US1748386A (en) | 1925-10-21 | 1926-11-04 | Electric discharge tube |
Country Status (1)
Country | Link |
---|---|
US (1) | US1748386A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2527945A (en) * | 1946-06-25 | 1950-10-31 | Rca Corp | Method of and apparatus for generation of electrical energy from nuclear reactions |
US2537150A (en) * | 1949-02-25 | 1951-01-09 | Nat Union Radio Corp | Electron multiplier tube |
US2598925A (en) * | 1946-06-25 | 1952-06-03 | Rca Corp | Method and means for generating electrical energy from a radioactive source |
US2610302A (en) * | 1950-09-14 | 1952-09-09 | Rca Corp | Radiation intensity metering system |
DE767499C (en) * | 1936-03-21 | 1952-09-15 | Cfcmug | Television reception arrangement |
US2633542A (en) * | 1948-06-30 | 1953-03-31 | Rca Corp | High efficiency nuclear electrostatic generator |
US2669609A (en) * | 1948-10-30 | 1954-02-16 | Rca Corp | Electron discharge device |
DE764272C (en) * | 1935-01-08 | 1954-09-27 | Fernseh Gmbh | Secondary electron multiplier |
US2892964A (en) * | 1956-11-30 | 1959-06-30 | Ct D Etudes Et De Dev De L Ele | Ionic discharge devices |
-
1926
- 1926-11-04 US US146186A patent/US1748386A/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE764272C (en) * | 1935-01-08 | 1954-09-27 | Fernseh Gmbh | Secondary electron multiplier |
DE767499C (en) * | 1936-03-21 | 1952-09-15 | Cfcmug | Television reception arrangement |
US2527945A (en) * | 1946-06-25 | 1950-10-31 | Rca Corp | Method of and apparatus for generation of electrical energy from nuclear reactions |
US2598925A (en) * | 1946-06-25 | 1952-06-03 | Rca Corp | Method and means for generating electrical energy from a radioactive source |
US2633542A (en) * | 1948-06-30 | 1953-03-31 | Rca Corp | High efficiency nuclear electrostatic generator |
US2669609A (en) * | 1948-10-30 | 1954-02-16 | Rca Corp | Electron discharge device |
US2537150A (en) * | 1949-02-25 | 1951-01-09 | Nat Union Radio Corp | Electron multiplier tube |
US2610302A (en) * | 1950-09-14 | 1952-09-09 | Rca Corp | Radiation intensity metering system |
US2892964A (en) * | 1956-11-30 | 1959-06-30 | Ct D Etudes Et De Dev De L Ele | Ionic discharge devices |
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