US2153009A - Electric discharge lamp - Google Patents
Electric discharge lamp Download PDFInfo
- Publication number
- US2153009A US2153009A US98380A US9838036A US2153009A US 2153009 A US2153009 A US 2153009A US 98380 A US98380 A US 98380A US 9838036 A US9838036 A US 9838036A US 2153009 A US2153009 A US 2153009A
- Authority
- US
- United States
- Prior art keywords
- electrode
- electric discharge
- tungsten
- discharge lamp
- apex
- 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
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 9
- 229910052721 tungsten Inorganic materials 0.000 description 9
- 239000010937 tungsten Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010943 off-gassing Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/43—Charge-storage screens using photo-emissive mosaic, e.g. for orthicon, for iconoscope
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2231/00—Cathode ray tubes or electron beam tubes
- H01J2231/50—Imaging and conversion tubes
- H01J2231/50005—Imaging and conversion tubes characterised by form of illumination
- H01J2231/5001—Photons
- H01J2231/50015—Light
- H01J2231/50026—Infrared
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2231/00—Cathode ray tubes or electron beam tubes
- H01J2231/50—Imaging and conversion tubes
- H01J2231/50057—Imaging and conversion tubes characterised by form of output stage
- H01J2231/50063—Optical
Definitions
- This invention relates to electric discharge lamps and more particularly to lamps having a filling of a metal vapor and a rare gas. In such lamps at high pressure the anode and cathode functions can with advantage be fulfilled by different parts of the electrode. Good electrodes for such lamps consist of a block porous fritted metal, such as molybdenum or tungsten, impregnated with electron emitting material.
- a block of porous metal however is not easily outgassed when eddy current heating is employed.
- the object of this invention is to provide an improved electrode for the above type of lamp and to that end it consists in making the electrode of a coned disc preferably of porous fritted tungsten fixed or moulded around an axial tungsten wire or bundle of wires which project through the apex of the cone into the are.
- the larger cross-section of the cone encloses many more lines of force than a block such as hitherto used and as the walls of the disc are thin, the distance from the centre of the material to the surface is much less than in a block so that out gassing can be carried out much more easily and thoroughly.
- the large area of the cone is further advantageous in that during the running up period the whole of the surface may act as the anode.
- Fig. 1 showing one form of electrode in section secured in the end of an envelope and Fig. 2 showing an alternative form in cross section.
- l represents an envelope of glass or other suitable material in the end of which is mounted an electrode consisting of a cone ll of porous fritted metal such as molybdenum or tungsten impregnated with an electron emitting material.
- This cone II is fixed to or moulded round a tungsten wire l2 which projects through the apex of the cone.
- the single wire l2 may be replaced by a twisted bundle of small wires if desired.
- the end of the wire l2 may be made smooth or it may be enlarged by securing thereto appropriate half cycle.
- the end of the tungsten wire or wires may be are welded and rounded over as shown at I 4 in Fig. 2.
- the disc is wholly or partly anysuitable way and may-be heat treated for instance, by firing in hydrogen before sealing it into the lamp.
- the axial wire I! is either sealed directly through the envelope in, or is joined to the inlead or to a heatinsulating wire loop joined to the sealed inlead, when desired. Impregnation and outgassing are facilitated by making the disc thin and by using a minimum weight of electrode material.
- the conical shape assures accurate centering of the are at the electrode.
- Athigh pressures the projecting tungsten wire or wires l3 fulfils the anode function and the outer cone surface the cathode function. At low pressures and on starting practically the whole electrode fulfils both functions thus minimizing electrode disintegration.
- the tungsten may have a minute percentage of a metal such as nickel added to it. This can be done, for example, by adding the nickel as a powder, as a solution of one of its compounds, as a colloidal, suspension, or by ball milling the tungsten powder in a nickel container before moulding, when desired. It is important that the quantity of nickel be kept low as otherwise it is apt to evaporate and blacken the tube walls.
- nickel can under certain conditions serve to improve the electrode electron emission.
- part of the inner cone surface may be covered with a layer of nickel l5 shown in Fig. 1 which is in turn coated with electron emitting material.
- This nickel may be a sheet or gauze washer or may be sprayed on to the tungsten.
- An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc of porous tungsten secured at its apex to a tungsten electrode lead on which said coned disc is axially mounted, the apex of said coned disc being'in closer proximity to the opposite electrode than the base thereof, said lead extending through said coned disc and projecting through the apex thereof, the end of said wire forming a rounded projection.
- An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc of porous, fritted tungsten having an admixture of nickel therein and a material of high electron emissivity characteristics associated therewith,
- An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc oi.
- porous, fritted tungsten having an admixture of nickel therein and being secured at its apex to an electrode lead, the apex of said coned disc being in closer proximity to the opposite electrode than the base thereof, said lead extending through said coned disc and projecting through the apex thereof.
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
- Discharge Lamp (AREA)
Description
April 4, 1939 w SCOTT 2,153,009
ELECTRIC DISCHARGE LAMP Filed Aug. 28, 1956 INVENTOR WiHiam Joseph Scott Patented Apr. .4, 1939 I PATENT. OFFICE ELECTRIC DISCHARGE LAMP Williani Scott, Rugby, England, assignor to General Electric Company, a corporation of New York 7 Application August 28, 1936, Serial No. 98,380 I Great Britain September 10, 1935 l 3Claims. (01.176-126) This invention relates to electric discharge lamps and more particularly to lamps having a filling of a metal vapor and a rare gas. In such lamps at high pressure the anode and cathode functions can with advantage be fulfilled by different parts of the electrode. Good electrodes for such lamps consist of a block porous fritted metal, such as molybdenum or tungsten, impregnated with electron emitting material.
A block of porous metal however is not easily outgassed when eddy current heating is employed.
The object of this invention is to provide an improved electrode for the above type of lamp and to that end it consists in making the electrode of a coned disc preferably of porous fritted tungsten fixed or moulded around an axial tungsten wire or bundle of wires which project through the apex of the cone into the are. When out gassing an electrode of such a shape by induction heating, the larger cross-section of the cone encloses many more lines of force than a block such as hitherto used and as the walls of the disc are thin, the distance from the centre of the material to the surface is much less than in a block so that out gassing can be carried out much more easily and thoroughly. The large area of the cone is further advantageous in that during the running up period the whole of the surface may act as the anode.
The accompanying drawing illustrates this invention Fig. 1 showing one form of electrode in section secured in the end of an envelope and Fig. 2 showing an alternative form in cross section. In Fig. 1, l represents an envelope of glass or other suitable material in the end of which is mounted an electrode consisting of a cone ll of porous fritted metal such as molybdenum or tungsten impregnated with an electron emitting material. This cone II is fixed to or moulded round a tungsten wire l2 which projects through the apex of the cone. The single wire l2 may be replaced by a twisted bundle of small wires if desired. The end of the wire l2 may be made smooth or it may be enlarged by securing thereto appropriate half cycle.
operation of the lamp and provide visible light.
Alternatively the end of the tungsten wire or wires may be are welded and rounded over as shown at I 4 in Fig. 2. The disc is wholly or partly anysuitable way and may-be heat treated for instance, by firing in hydrogen before sealing it into the lamp. The axial wire I! is either sealed directly through the envelope in, or is joined to the inlead or to a heatinsulating wire loop joined to the sealed inlead, when desired. Impregnation and outgassing are facilitated by making the disc thin and by using a minimum weight of electrode material. The conical shape assures accurate centering of the are at the electrode. Athigh pressures the projecting tungsten wire or wires l3 fulfils the anode function and the outer cone surface the cathode function. At low pressures and on starting practically the whole electrode fulfils both functions thus minimizing electrode disintegration.
In order to improve the mechanical strength of the fritted mass and its adhesion to the axial wire or wires the tungsten may have a minute percentage of a metal such as nickel added to it. This can be done, for example, by adding the nickel as a powder, as a solution of one of its compounds, as a colloidal, suspension, or by ball milling the tungsten powder in a nickel container before moulding, when desired. It is important that the quantity of nickel be kept low as otherwise it is apt to evaporate and blacken the tube walls.
This addition of nickel can under certain conditions serve to improve the electrode electron emission. For starting purposes part of the inner cone surface may be covered with a layer of nickel l5 shown in Fig. 1 which is in turn coated with electron emitting material. This nickel may be a sheet or gauze washer or may be sprayed on to the tungsten.
What I claim as new and desire to secure by Letters Patent of the United States, is:
1. An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc of porous tungsten secured at its apex to a tungsten electrode lead on which said coned disc is axially mounted, the apex of said coned disc being'in closer proximity to the opposite electrode than the base thereof, said lead extending through said coned disc and projecting through the apex thereof, the end of said wire forming a rounded projection.
2. An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc of porous, fritted tungsten having an admixture of nickel therein and a material of high electron emissivity characteristics associated therewith,
said coned disc and projecting through the apex thereof,
3. An electrode for an electric discharge lamp device having electrodes and electrode leads sealed therein, said electrode comprising a coned disc oi.
porous, fritted tungsten having an admixture of nickel therein and being secured at its apex to an electrode lead, the apex of said coned disc being in closer proximity to the opposite electrode than the base thereof, said lead extending through said coned disc and projecting through the apex thereof.
WILLIAM J. SCO'II.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2153009X | 1935-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2153009A true US2153009A (en) | 1939-04-04 |
Family
ID=10899901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US98380A Expired - Lifetime US2153009A (en) | 1935-09-10 | 1936-08-28 | Electric discharge lamp |
Country Status (3)
Country | Link |
---|---|
US (1) | US2153009A (en) |
DE (1) | DE887668C (en) |
FR (1) | FR810516A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562887A (en) * | 1945-01-04 | 1951-08-07 | Westinghouse Electric Corp | Vapor lamp and system |
US2622409A (en) * | 1946-07-26 | 1952-12-23 | Inst Divi Thomae Foundation | Ultraviolet light source and circuit for refrigerator cabinets |
US2670451A (en) * | 1950-01-12 | 1954-02-23 | Westinghouse Electric Corp | Short arc high-pressure vapor discharge lamp |
US2716713A (en) * | 1950-03-22 | 1955-08-30 | Gen Electric | Cold electrode pulse lamp structure |
US2720474A (en) * | 1952-09-13 | 1955-10-11 | Raytheon Mfg Co | Coated electrodes for electron discharge devices |
US2725495A (en) * | 1951-06-04 | 1955-11-29 | Westinghouse Electric Corp | Discharge lamp |
DE1088612B (en) * | 1957-12-13 | 1960-09-08 | British Thomson Houston Co Ltd | Process for the production of a raw electrode for electrodes of high pressure discharge lamps |
EP0441387A2 (en) * | 1990-02-08 | 1991-08-14 | Toshiba Lighting & Technology Corporation | Low pressure gas discharge lamp |
EP0473164A2 (en) * | 1990-08-30 | 1992-03-04 | Toshiba Lighting & Technology Corporation | Low pressure mercury vapor discharge lamp having cold cathode |
-
1936
- 1936-08-28 US US98380A patent/US2153009A/en not_active Expired - Lifetime
- 1936-09-09 FR FR810516D patent/FR810516A/en not_active Expired
- 1936-09-11 DE DEE2318A patent/DE887668C/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562887A (en) * | 1945-01-04 | 1951-08-07 | Westinghouse Electric Corp | Vapor lamp and system |
US2622409A (en) * | 1946-07-26 | 1952-12-23 | Inst Divi Thomae Foundation | Ultraviolet light source and circuit for refrigerator cabinets |
US2670451A (en) * | 1950-01-12 | 1954-02-23 | Westinghouse Electric Corp | Short arc high-pressure vapor discharge lamp |
US2716713A (en) * | 1950-03-22 | 1955-08-30 | Gen Electric | Cold electrode pulse lamp structure |
US2725495A (en) * | 1951-06-04 | 1955-11-29 | Westinghouse Electric Corp | Discharge lamp |
US2720474A (en) * | 1952-09-13 | 1955-10-11 | Raytheon Mfg Co | Coated electrodes for electron discharge devices |
DE1088612B (en) * | 1957-12-13 | 1960-09-08 | British Thomson Houston Co Ltd | Process for the production of a raw electrode for electrodes of high pressure discharge lamps |
EP0441387A2 (en) * | 1990-02-08 | 1991-08-14 | Toshiba Lighting & Technology Corporation | Low pressure gas discharge lamp |
EP0441387A3 (en) * | 1990-02-08 | 1992-04-15 | Toshiba Lighting & Technology Corporation | Low pressure gas discharge lamp |
EP0473164A2 (en) * | 1990-08-30 | 1992-03-04 | Toshiba Lighting & Technology Corporation | Low pressure mercury vapor discharge lamp having cold cathode |
EP0473164A3 (en) * | 1990-08-30 | 1992-04-22 | Toshiba Lighting & Technology Corporation | Low pressure mercury vapor discharge lamp having cold cathode |
US5256935A (en) * | 1990-08-30 | 1993-10-26 | Toshiba Lighting & Technology Corporation | Low pressure mercury vapor discharge lamp having cold cathode |
Also Published As
Publication number | Publication date |
---|---|
FR810516A (en) | 1937-03-23 |
DE887668C (en) | 1953-08-24 |
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