US2207133A - Electric discharge lamp - Google Patents
Electric discharge lamp Download PDFInfo
- Publication number
- US2207133A US2207133A US238650A US23865038A US2207133A US 2207133 A US2207133 A US 2207133A US 238650 A US238650 A US 238650A US 23865038 A US23865038 A US 23865038A US 2207133 A US2207133 A US 2207133A
- Authority
- US
- United States
- Prior art keywords
- envelope
- electric discharge
- discharge lamp
- sleeve
- electrode
- 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
Images
Classifications
-
- 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
- H01J61/10—Shields, screens, or guides for influencing the discharge
Definitions
- This invention relates to electric discharge lamps and more particularly to lamps of the high vapor pressure type similar to those disclosed in the United States Patent 2,094,694 issued October 5, 1937.
- Such lamps are usually made with envelopes of quartz or high melting point glass, and we have observed that, the material in the neighborhood of the electrodes is frequently attacked and devitrified.
- the object of this invention is to provide means for preventing this devitriflcation, and to that end it consists in providing means for protecting the wall of the envelope in the vicinity of the cathode from sputtering which may cause devitriflcation and from heat radiation from the cathode.
- This means may consist .of a shield between the cathode and the wall of the lamp such as a cylinder or sleeve of refractory material, for example, of tungsten, molybdenum or The material forming ti e. wall of the quartz. envelope will then be protected from sputtered material from the cathode, and the devitrification will be reduced owing to the temperature of the wall being reduced, and owing to the shielding from the discharge and the sputtered material.
- Fig. 1 is a side elevational, partly sectional view of one embodiment of the invention
- Fig. 2 is a similar view of another embodiment I of the invention.
- Fig. 3- is a similar view of stint-another embodiment'of the invention.
- the gaseous electric discharge device comprises a-tubular: envelopel of quartz, into which an electrode 2 is sealed.
- The-electrodes are preferably thermionic, activated electrodes which serve alternately as anode and as cathode when the device is operated on alternating current;
- the sealed. envelope I. has a starting gas therein, such as argon, and a quantity oi-metal, such as mercury, the vapor of which .is luminosity producing during the operation-of the device.
- a sleeve 4 of tungsten or molybdenum is inserted in the envelope 1, so that it surrounds the electrode-2.
- the sleeve is made of metal, as in this case, it may be utilized as a starting or auxiliary electrode by providing a current lead therefor.
- a thin sleeve of molybdenum or other suitable refrac-'- tory metal 4 is sealed between an inner quartz sleeve Sand the outer envelope I so that it forms II a barrier which will prevent devitriflcation from spreading from the inner quartz shield to the outer envelope.
- the metal sleeve may be utilized as an electrode.
- An electric discharge lamp of the highpressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizablematerial-therein, and I a sleeve of refractory metal fused into the end of said envelope and surrounding one of said electrodes, part of the vitreous material of said envelope beinginterposedbetween said electrode and saidmetal sleeve and covering'the major I portion of the-inner surface of said sleeve, said sleeve preventing devitriflcation of said envelope in the region of said electrode.
- An electric discharge lamp of the-high pressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizable material therein, and
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
y 9,- 1940- w. J. sc TT El AL 7,133
ELECTRIC DISCHARGE LAMP vFiled Nov. 3, 1938 INVENTORS" WiHiam Joseph ScoHt Harry Kebbell Bourne Patented July 9, 1940 UNITED STATES PATENT oFF cE ELECTRIC mscnanen LAMP WilliamJ. Scott and Harry K. Bourne, Rugby,
England, assignors to General Electric .Company, a corporation of New York Application November 3, 1938, Serial No. 238,659
In Great Britain November 3, 1937 2 Claims. "(01. 176 -126) This invention relates to electric discharge lamps and more particularly to lamps of the high vapor pressure type similar to those disclosed in the United States Patent 2,094,694 issued October 5, 1937. Such lamps are usually made with envelopes of quartz or high melting point glass, and we have observed that, the material in the neighborhood of the electrodes is frequently attacked and devitrified.
The object of this invention is to provide means for preventing this devitriflcation, and to that end it consists in providing means for protecting the wall of the envelope in the vicinity of the cathode from sputtering which may cause devitriflcation and from heat radiation from the cathode. This means may consist .of a shield between the cathode and the wall of the lamp such as a cylinder or sleeve of refractory material, for example, of tungsten, molybdenum or The material forming ti e. wall of the quartz. envelope will then be protected from sputtered material from the cathode, and the devitrification will be reduced owing to the temperature of the wall being reduced, and owing to the shielding from the discharge and the sputtered material.
. In the drawing accompanying and forming part of this specification three embodiments o the invention are shown inwhich Fig. 1 is a side elevational, partly sectional view of one embodiment of the invention,
. Fig. 2 is a similar view of another embodiment I of the invention, and
' Fig. 3- is a similar view of stint-another embodiment'of the invention. I
' Referring to the drawing the gaseous electric discharge device comprises a-tubular: envelopel of quartz, into which an electrode 2 is sealed.
Before sealing the electrode into the envelope it is flrstsealed into a cylinder 3 of quartz, which is then sealed into the envelope I in such maner that the walls of the cylinder are infclose proximity to but not in actual contact with, the walls of the envelope I. It willbe understood, of course, that the other end of the device is similar in structure to the end shown in the. drawing. The-electrodes are preferably thermionic, activated electrodes which serve alternately as anode and as cathode when the device is operated on alternating current; The sealed. envelope I. has a starting gas therein, such as argon, and a quantity oi-metal, such as mercury, the vapor of which .is luminosity producing during the operation-of the device. I
.In Fig. 2 a sleeve 4 of tungsten or molybdenum is inserted in the envelope 1, so that it surrounds the electrode-2. When'the sleeve is made of metal, as in this case, it may be utilized as a starting or auxiliary electrode by providing a current lead therefor. Y
. l i 'Inthe construction illustrated in Fig. 3 a thin sleeve of molybdenum or other suitable refrac-'- tory metal 4 is sealed between an inner quartz sleeve Sand the outer envelope I so that it forms II a barrier which will prevent devitriflcation from spreading from the inner quartz shield to the outer envelope. In this case the metal sleeve may be utilized as an electrode. t What we claim as new and desire to secure by M letters Patent of the United States, is:
1. An electric discharge lamp of the highpressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizablematerial-therein, and I a sleeve of refractory metal fused into the end of said envelope and surrounding one of said electrodes, part of the vitreous material of said envelope beinginterposedbetween said electrode and saidmetal sleeve and covering'the major I portion of the-inner surface of said sleeve, said sleeve preventing devitriflcation of said envelope in the region of said electrode.
2. An electric discharge lamp of the-high pressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizable material therein, and
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2207133X | 1937-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2207133A true US2207133A (en) | 1940-07-09 |
Family
ID=10901207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US238650A Expired - Lifetime US2207133A (en) | 1937-11-03 | 1938-11-03 | Electric discharge lamp |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2207133A (en) |
| FR (1) | FR845552A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464762A (en) * | 1945-09-15 | 1949-03-15 | Sylvania Electric Prod | Pulser tube |
| US2567491A (en) * | 1943-12-29 | 1951-09-11 | Mitchell John Wesley | Luminous discharge tube |
| US2727187A (en) * | 1950-03-03 | 1955-12-13 | Gen Electric | Electric discharge lamp |
| US3767957A (en) * | 1972-03-17 | 1973-10-23 | Ott J Labor Inc | Fluorescent lamp with shielded electrodes |
| US5751111A (en) * | 1994-04-13 | 1998-05-12 | U.S. Philips Corporation | High-pressure metal halide lamp |
-
1938
- 1938-11-03 US US238650A patent/US2207133A/en not_active Expired - Lifetime
- 1938-11-03 FR FR845552D patent/FR845552A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2567491A (en) * | 1943-12-29 | 1951-09-11 | Mitchell John Wesley | Luminous discharge tube |
| US2464762A (en) * | 1945-09-15 | 1949-03-15 | Sylvania Electric Prod | Pulser tube |
| US2727187A (en) * | 1950-03-03 | 1955-12-13 | Gen Electric | Electric discharge lamp |
| US3767957A (en) * | 1972-03-17 | 1973-10-23 | Ott J Labor Inc | Fluorescent lamp with shielded electrodes |
| US5751111A (en) * | 1994-04-13 | 1998-05-12 | U.S. Philips Corporation | High-pressure metal halide lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| FR845552A (en) | 1939-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3121184A (en) | Discharge lamp with cathode shields | |
| US2135661A (en) | Gaseous electric discharge device | |
| US2207133A (en) | Electric discharge lamp | |
| US2064369A (en) | Electric discharge tube | |
| US2241362A (en) | Electron emissive cathode | |
| US3422300A (en) | Ceramic arc tube and closure member construction | |
| US2438181A (en) | Fluorescent and/or cathode glow lamp and method | |
| US1961719A (en) | Gaseous electric discharge device | |
| US2488716A (en) | Electric high-pressure discharge tube | |
| US2177710A (en) | Fluorescent sign lamp | |
| US2009839A (en) | Thermionic cathode | |
| US2172839A (en) | High-pressure metal-vapor electric discharge device | |
| US3013175A (en) | High output discharge lamp | |
| US2273450A (en) | High pressure metal vapor lamp | |
| US2056926A (en) | Electric gaseous discharge device | |
| CN204792683U (en) | Long -life fluorescence lamp | |
| US2241345A (en) | Electron emissive cathode | |
| GB2080020A (en) | Electrical Light Source with a Metal Halide Discharge Tube and a Tungsten Filament Connected in Series with the Discharge Tube | |
| US2561898A (en) | Electric discharge lamp | |
| US2670399A (en) | High-pressure gaseous discharge lamp | |
| US2164183A (en) | Electric lamp | |
| US2076286A (en) | Electric gaseous discharge device | |
| US2236289A (en) | Thermionic device | |
| US2030437A (en) | Electric discharge device | |
| US2080914A (en) | Gaseous electric discharge lamp |