US1928370A - Rectifying discharge tube - Google Patents
Rectifying discharge tube Download PDFInfo
- Publication number
- US1928370A US1928370A US185044A US18504427A US1928370A US 1928370 A US1928370 A US 1928370A US 185044 A US185044 A US 185044A US 18504427 A US18504427 A US 18504427A US 1928370 A US1928370 A US 1928370A
- Authority
- US
- United States
- Prior art keywords
- anode
- core
- discharge tube
- carbon
- anodes
- 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
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0048—Tubes with a main cathode
- H01J2893/0051—Anode assemblies; screens for influencing the discharge
Definitions
- the invention relates to rectifying discharge tubes comprising anodes consisting of a metal core which is superficially coated with carbon.
- the core may consist of tungsten; in that case it may be arranged in the discharge tube in the shape of a helix and may be surrounded by a carbon cylinder.
- the great advantage arising from the use of carbon anodes in rectfying discharge tubes is, as known, due to the high inverse voltage obtained when such anodes are used.
- the term inverse voltage must be understood to mean the voltage at which the current starts to pass in the direction from the cathode to the anode. When using carbon anodes, this inverse voltage is considerably higher than when metal anodes are used. Carbon anodes have the disadvantage that they cannot easily be deprived of occluded gases.
- the invention has for its object to secure the high inverse voltage which favorably distinguishes carbon anodes from the metal anodes, and at the same time to retain the easy deprivation of occluded gases characteristic of metal anodes.
- the anode of a rectifying discharge tube consists of a metal core coated with a graphite solution which may or may not contain a binding agent; the anode can be deprived of occluded gases in any known manner, for example by arranging it in a high frequency field, in which case the anode is heated by the Foucault currents produced in it by the inducing field. With high frequency deprivation of occluded gases the volatile components are expelled and the carbon layer is baked together so as to form a thin coherent coating.
- the anode may also consist of a metal helix surrounded by a carbon cylinder. Such an anode can be deprived of occluded gases for example by galvanically heating the said helix.
- anode consisting of a. metal core (for example, a tungsten helix) on which a graphite solution is applied.
- a metal core for example, a tungsten helix
- Such an anode can be deprived of occluded gases by heating the core to incandescence in vacuum, a small coherent carbon block with a metal core being thus produced.
- Fig. 1 is a diagram representing a circuit arrangement comprising a rectifying tube
- Fig. 2 is a sectional view of an electrode according to the invention.
- a battery 3 to be charged.
- a transformer for energizing the circuit comprises the primary and secondary windings 4 and 5, respectively.
- the provision of an anode 1 consisting of a metal core coated with carbon has the advantage that the inverse voltage, that is, the voltage at which the current would pass in the direction from the cathode 2 to the anode 1 and at which the battery would be discharged, is increased.
- a preferred form of anode comprises a metal wire 5, for example of tungsten, wound in the form of a helix closely spaced from the central portion 6.
- the wire 5 is surrounded by a carbon cylinder 7.
- the upper end of thehelix 5 is connected to the conductor 6 while the lower end is secured to a conductor 9, so that the electrode is supported upon the conductors 8 and 9, these conductors also serving to conduct current to the anode.
- the latter is connected to a pump.
- a voltage is then applied to the conductors 8 and 9 whereby the helix 5 is galvanically heated to incandescence during the evacuation of the tube. In this manner the carbon cylinder '1 is readily freed of occluded gases.
- An anode for an electric discharge tube comprising a core consisting of a helically-wound metal wire and a hollow carbon body placed over said core and in direct heat-conducting and electrically-conducting relation with said core.
- An anode for an electrical discharge tube comprising a core consisting of a helically-wound metal wire and a hollow carbon body surrounding said core and in direct heat-conducting and electrically-conducting relation therewith, said core also forming the support for the anode.
- An electric discharge tube including an incandescent cathode and an anode having a core with a surface of carbon, said core comprising a metallic member of helical form adapted to heat said surface, said surface comprising a hollow cylinder of carbon positioned directly on said core.
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Description
Sept. 26, 1933. P. w. DOBBEN ET AL 1,928,370
RECTIFYING DISCHARGE TUBE Filed April 19. 1927 Patented Sept. 26, 1933 UNITED STATES PATENT OFFICE BECTIFYING DISCHARGE TUBE Gloellampeniabrieken,
Eindhoven, Net h er lands, a company of the Kingdom of the Netherlands Application April 19, 1927, Serial No. 185,044, and in the Netherlands May 20, 1926 3Claims.
The invention relates to rectifying discharge tubes comprising anodes consisting of a metal core which is superficially coated with carbon. The core may consist of tungsten; in that case it may be arranged in the discharge tube in the shape of a helix and may be surrounded by a carbon cylinder.
The great advantage arising from the use of carbon anodes in rectfying discharge tubes is, as known, due to the high inverse voltage obtained when such anodes are used. The term inverse voltage must be understood to mean the voltage at which the current starts to pass in the direction from the cathode to the anode. When using carbon anodes, this inverse voltage is considerably higher than when metal anodes are used. Carbon anodes have the disadvantage that they cannot easily be deprived of occluded gases. The invention has for its object to secure the high inverse voltage which favorably distinguishes carbon anodes from the metal anodes, and at the same time to retain the easy deprivation of occluded gases characteristic of metal anodes.
The anode of a rectifying discharge tube according to the invention consists of a metal core coated with a graphite solution which may or may not contain a binding agent; the anode can be deprived of occluded gases in any known manner, for example by arranging it in a high frequency field, in which case the anode is heated by the Foucault currents produced in it by the inducing field. With high frequency deprivation of occluded gases the volatile components are expelled and the carbon layer is baked together so as to form a thin coherent coating. The anode may also consist of a metal helix surrounded by a carbon cylinder. Such an anode can be deprived of occluded gases for example by galvanically heating the said helix.
It is also possible to use an anode consisting of a. metal core (for example, a tungsten helix) on which a graphite solution is applied. Such an anode can be deprived of occluded gases by heating the core to incandescence in vacuum, a small coherent carbon block with a metal core being thus produced.
The invention will be more clearly understood upon reference to the accompanying drawing illustrating a preferred embodiment thereof.
In the drawing,
Fig. 1 is a diagram representing a circuit arrangement comprising a rectifying tube, and
Fig. 2 is a sectional view of an electrode according to the invention.
InIdgJarectiflerisshowncompi-isingan anode 1 constructed in accordance with the invention and a cathode 2. In circuit with the rectifier is a battery 3 to be charged. A transformer for energizing the circuit comprises the primary and secondary windings 4 and 5, respectively. The provision of an anode 1 consisting of a metal core coated with carbon has the advantage that the inverse voltage, that is, the voltage at which the current would pass in the direction from the cathode 2 to the anode 1 and at which the battery would be discharged, is increased.
As shown in Fig. 2, a preferred form of anode comprises a metal wire 5, for example of tungsten, wound in the form of a helix closely spaced from the central portion 6. The wire 5 is surrounded by a carbon cylinder 7. The upper end of thehelix 5 is connected to the conductor 6 while the lower end is secured to a conductor 9, so that the electrode is supported upon the conductors 8 and 9, these conductors also serving to conduct current to the anode. After the electrodes are mounted in the tube, the latter is connected to a pump. A voltage is then applied to the conductors 8 and 9 whereby the helix 5 is galvanically heated to incandescence during the evacuation of the tube. In this manner the carbon cylinder '1 is readily freed of occluded gases.
What we claim is:
1. An anode for an electric discharge tube comprising a core consisting of a helically-wound metal wire and a hollow carbon body placed over said core and in direct heat-conducting and electrically-conducting relation with said core.
2. An anode for an electrical discharge tube comprising a core consisting of a helically-wound metal wire and a hollow carbon body surrounding said core and in direct heat-conducting and electrically-conducting relation therewith, said core also forming the support for the anode.
3. An electric discharge tube including an incandescent cathode and an anode having a core with a surface of carbon, said core comprising a metallic member of helical form adapted to heat said surface, said surface comprising a hollow cylinder of carbon positioned directly on said core.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1928370X | 1926-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1928370A true US1928370A (en) | 1933-09-26 |
Family
ID=19873316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US185044A Expired - Lifetime US1928370A (en) | 1926-05-20 | 1927-04-19 | Rectifying discharge tube |
Country Status (1)
Country | Link |
---|---|
US (1) | US1928370A (en) |
-
1927
- 1927-04-19 US US185044A patent/US1928370A/en not_active Expired - Lifetime
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