US2474211A - Electron discharge device - Google Patents

Electron discharge device Download PDF

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Publication number
US2474211A
US2474211A US749142A US74914247A US2474211A US 2474211 A US2474211 A US 2474211A US 749142 A US749142 A US 749142A US 74914247 A US74914247 A US 74914247A US 2474211 A US2474211 A US 2474211A
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United States
Prior art keywords
cathode
electron discharge
discharge device
shield
anode
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Expired - Lifetime
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US749142A
Inventor
Back Raymond Richard
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0002—Construction arrangements of electrode systems

Definitions

  • This invention relates to thermionic valves adapted to operate at high voltages for example as a rectifier for the supply voltage to a cathode ray tube of an oscillograph or television receiver.
  • the valve of the invention comprises an anode presenting an unbroken convex surface to a tubular indirectly heated lcathode which is disposed perpenducular t ⁇ o the axis of the anode.
  • the cathode is mounted upon a lead-in conductor sealed in the envelope opposite the stem.
  • the cathode may be supported in plates of metal or of insulating material such as mica upstanding from a disc shield supported upon the stem.
  • a further feature is the provision of end shields for the cathode lfor shielding the anode from the projecting parts of a heater passing through the cathode.
  • FIG. 1 A valve embodying the invention is shown in the accompanying drawing of which Figs. 1 and 2 are two views at right angles of the electrode structure, Fig. 1 being a sectional view.
  • I is a glass stem in which wires 2, 3 and 4 are sealed in the same way.
  • Wire 2 supports a flanged metal disc 5 on which are xed by welding a pair of arched metal end shields 6, 'I for a tubular indirectlyheated cathode 8.
  • the cathode is supported parallel to disc 5 by means of mica plates 9 which are in turn supported in slots in the end shields 6, 'I.
  • the cathode and one of the legs of the internal heater are connected to shield 6 by wires I0, II respectively and leading-in wire 2 serves for the external connection to these elements.
  • the other heater leg is connected to a wire I2 which passes freely through an aperture in the disc and is welded to leading-in wire 4.
  • the wire 3 sealed in the stem ⁇ carries a small metal plate I3 to which getter material is applied.
  • the stem I is mounted in a glass bulb in the usual way, means being provided for evacuation.
  • a leading-in Wire I4 is sealed in the closed end of the bulb.
  • This wire is provided with a sheath (Cl. Z-27.5)
  • An electron discharge device comprising an indirectly heated cathode mounted substantially transverse to the axis of said device, a heater passing through said cathode and projecting through the ends thereof, an anode having a transverse dimension substantially equal to a transverse dimension of said cathode mounted in spaced relation from one side of said cathode, and shield means mounted adjacent said cathode, said means including a base shield positioned from said cathode on a side remote from said one side and end shield means extending from said base shield and interposed between said anode and projecting parts of said heater.
  • An electron discharge device in which said base shield constitutes a metal disc and said end shield means comprises g1; least one arched metal shield secured to said 3.

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  • Discharge Lamp (AREA)

Description

June 28, 1949. l R.- R, BACK 2,474,211
ELECTRON DISCHARGE DEVICE vFild May '20, i947 S INVENToR 0' l v EN@ -ATT RNEY Patented June 2s, 1949 UNITED STATES PATENT OFFICE ELECTRON DISCHARGE DEVICE Delaware Application May 20, 1947, Serial No. 749,142 In Great Britain July 7, 1939 Section 1, Public Law 690, August 8, 1946 Patent expires July 7, 1959 3 Claims.
This invention relates to thermionic valves adapted to operate at high voltages for example as a rectifier for the supply voltage to a cathode ray tube of an oscillograph or television receiver.
The valve of the invention comprises an anode presenting an unbroken convex surface to a tubular indirectly heated lcathode which is disposed perpenducular t`o the axis of the anode. Preferalbly the cathode is mounted upon a lead-in conductor sealed in the envelope opposite the stem. The cathode may be supported in plates of metal or of insulating material such as mica upstanding from a disc shield supported upon the stem. A further feature is the provision of end shields for the cathode lfor shielding the anode from the projecting parts of a heater passing through the cathode.
A valve embodying the invention is shown in the accompanying drawing of which Figs. 1 and 2 are two views at right angles of the electrode structure, Fig. 1 being a sectional view.
Referring to the drawing, I is a glass stem in which wires 2, 3 and 4 are sealed in the same way. Wire 2 supports a flanged metal disc 5 on which are xed by welding a pair of arched metal end shields 6, 'I for a tubular indirectlyheated cathode 8. The cathode is supported parallel to disc 5 by means of mica plates 9 which are in turn supported in slots in the end shields 6, 'I. The cathode and one of the legs of the internal heater are connected to shield 6 by wires I0, II respectively and leading-in wire 2 serves for the external connection to these elements. The other heater leg is connected to a wire I2 which passes freely through an aperture in the disc and is welded to leading-in wire 4. The wire 3 sealed in the stem `carries a small metal plate I3 to which getter material is applied.
The stem I is mounted in a glass bulb in the usual way, means being provided for evacuation. In the closed end of the bulb a leading-in Wire I4 is sealed. This wire is provided with a sheath (Cl. Z-27.5)
2 I5 in the form of a glass tube, and carries a dished metal anode plate lr6. This anode plate is co-axial with the disc 5 and stem I and presents a smooth convex surface to the cathode 8. The heater for the cathode is effectively screened from the anode by the end shields 6, 1 and the stem is shielded from bombardment and overheating by the disc 5.
What is claimed is:
1. An electron discharge device comprising an indirectly heated cathode mounted substantially transverse to the axis of said device, a heater passing through said cathode and projecting through the ends thereof, an anode having a transverse dimension substantially equal to a transverse dimension of said cathode mounted in spaced relation from one side of said cathode, and shield means mounted adjacent said cathode, said means including a base shield positioned from said cathode on a side remote from said one side and end shield means extending from said base shield and interposed between said anode and projecting parts of said heater.
2. An electron discharge device according to claim 1 in which said base shield constitutes a metal disc and said end shield means comprises g1; least one arched metal shield secured to said 3. An electron discharge according to claim 1 in which said cathode is insulatingly supported on said base shield.
RAYMOND RICHARD BACK.
REFERENCES CITED The follorwing referenlces are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date 1,956,396 Moran Apr. 24, 1934 2,107,945 I-Iull et al Feb. 8, 1938 2,113,005 Smith Apr. 5, 1938
US749142A 1939-07-07 1947-05-20 Electron discharge device Expired - Lifetime US2474211A (en)

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GB2474211X 1939-07-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420945A (en) * 1967-03-31 1969-01-07 Nasa Electrode and insulator with shielded dielectric junction
US5451929A (en) * 1991-07-02 1995-09-19 Newtron Products Company Smoke alarm and air cleaning device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956396A (en) * 1933-04-29 1934-04-24 Westinghouse Lamp Co Trigger tube
US2107945A (en) * 1934-11-20 1938-02-08 Gen Electric Cathode structure
US2113005A (en) * 1936-07-31 1938-04-05 Rca Corp Mount for electron discharge devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956396A (en) * 1933-04-29 1934-04-24 Westinghouse Lamp Co Trigger tube
US2107945A (en) * 1934-11-20 1938-02-08 Gen Electric Cathode structure
US2113005A (en) * 1936-07-31 1938-04-05 Rca Corp Mount for electron discharge devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420945A (en) * 1967-03-31 1969-01-07 Nasa Electrode and insulator with shielded dielectric junction
US5451929A (en) * 1991-07-02 1995-09-19 Newtron Products Company Smoke alarm and air cleaning device

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