US3484637A - Mercury vapour discharge lamp - Google Patents
Mercury vapour discharge lamp Download PDFInfo
- Publication number
- US3484637A US3484637A US708277A US3484637DA US3484637A US 3484637 A US3484637 A US 3484637A US 708277 A US708277 A US 708277A US 3484637D A US3484637D A US 3484637DA US 3484637 A US3484637 A US 3484637A
- Authority
- US
- United States
- Prior art keywords
- tube
- approximately
- discharge lamp
- mercury vapour
- vapour discharge
- 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
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title description 8
- 229910052753 mercury Inorganic materials 0.000 title description 5
- 239000004020 conductor Substances 0.000 description 8
- 230000005855 radiation Effects 0.000 description 7
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- CMJCEVKJYRZMIA-UHFFFAOYSA-M thallium(i) iodide Chemical compound [Tl]I CMJCEVKJYRZMIA-UHFFFAOYSA-M 0.000 description 1
- RMUKCGUDVKEQPL-UHFFFAOYSA-K triiodoindigane Chemical compound I[In](I)I RMUKCGUDVKEQPL-UHFFFAOYSA-K 0.000 description 1
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
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
Definitions
- the invention provides a more satisfactory solution for avoiding these disadvantages and consists in that the conductor extending along the discharge tube is screened by an electrically non-conducting material which is substantially impervious to ultraviolet radiation.
- tubular glass screen for this purpose, use is preferably made of tubular glass screen, ceramic material and the like.
- the wall thickness of such a tube is preferably at least 0.2 mm.
- a straight high-pressure mercury vapor discharge tube is provided with electrodes 2 and 3 of which electrode 2 P CC is connected in the usual manner via a long lead-in and supporting wire 4 with the aid of a bipolar screw cap 6 to oneiend in the drawing end of the evacuated outer envelope 7 surrounding the assembly.
- a short supporting and leadin wire Sis provided for electrode 3.
- the embodiment tube 1 is quartz glass and is provided with an ignition electrode 9 connected through a resistor 10 to the conductor 4.
- the distance between the electrodes 2 and 3 was approximately 50 mm. and the inner volume was approximately 15 cm.
- the tube 1 contained :60 mgs. of mercury which evaporated completely during normal operation and produced an operating voltage of approximately v. at a minimum wall temperature of approximately 580 C. (at a power of approximately 400 w.).
- the tube further contained approximately 3 mgs. of sodium iodide 10.3 mg. of thallium iodide and :0.06 mg. of indium iodide per cm.”
- the ignition gas used was argon at a pressure of approximately 20 mm.Hg.
- the nickel wire 4 extending along the discharge tube 1 at a distance of :10 mm. and having a thickness of :2 mm. was surrounded by a tube 8 of an electrically non-conducting ceramic material impervious to ultraviolet radiation.
- the wall thickness of the tube was aproximately 0.5 mm. and its length was approximately 100 mm.
- the ceramic material contained i94% by weight of A1 0 and '-6% by weight of SiO Initially, the lamp had a light output of approximately 80 lumens/w. and an ignition voltage of 250 v. After approximately 5000 operating hours, the ignition voltage had increased to 400 v. and the operating voltage to v.; the light output had decreased to 70 lumens/w.
- the improvement obtained using the ceramic tube 8 is probably due to the fact that the ultraviolet radiation of the tube 1 can no longer release any photo-electrons on the wire 4. Released electrons can reach the outer side of the discharge tube 1, which apparently results in sodium diffusing through the wall of the discharge tube 1 and hence in the occurence of the said disadvantageous phenomena.
- the same disadvantageous phenomena occur with the use of other alkali metals, for example lithium.
- a high-pressure mercury vapor discharge lamp comprising a discharge tube containing mercury and an alkali iodide, a pair of electrodes at opposite ends of said tube, an outer envelope surrounding and spaced from said tube, at least one conductor extending along the discharge tube and electrically connected tonne of the electrodes, and
- an electrically non-conducting screen consisting of a material substantially impervious to ultraviolet radiation surrounding said conductor.
Description
Dec. 16, 1969 J. Jf vAN BOORT ETAL 3,484,637
MERCURY VAPOUR DISCHARGE LAMP Filed Feb. 26. 1968 INVENTOR 5 HENRICUS J.J. v. BOORT CORNELIS A.J. JACOBS United States Patent MERCURY VAPOUR DISCHARGE LAMP Henricus Johannes Joseph van Boort, and Cornelis Adrianus Joannes Jacobs, Emmasingel, Eindhoven, Netherlands, assignors, by mesne assignments, to US. Philips Corporation, New York, N.Y., a corporation of Delaware Filed Feb. 26, 1968, Ser. No. 708,277 Claims priority, application Netherlands, Mar. 1, 1967, 6703447 Int. Cl. H011" 1/02, 7/24 US. Cl. 313-25 4 Claims ABSTRACT OF THE DISCLOSURE A high-pressure mercury vapor discharge lamp containing an alkali iodide in which a conductor parallel to the discharge path and connected to one of the electrodes is surrounded by a tube of material impervious to ultraviolet radiation to prevent discoloration of the glass envelope as well as an increase in the ignition and operating voltages of the lamp.
It has been proposed to eliminate these disadvantages in that the conductor extending along the lamp is arranged at a maximum distance from the lamp and in that an outer envelope surrounding the discharge tube is shaped so that the two ends of the discharge tube are mechanically supported in this envelope. Because of the large distance between the conductor and the tube it is no longer able to support the discharge tube.
This has the disadvantage that at least the central part of the outer envelope must be wide. A further disadvantage is that it had appeared to be necessary to provide the outer envelope with a gas filling, for example, of nitrogen, which resulted in an undesirable increase in heat dissipation of the light source.
The invention provides a more satisfactory solution for avoiding these disadvantages and consists in that the conductor extending along the discharge tube is screened by an electrically non-conducting material which is substantially impervious to ultraviolet radiation.
For this purpose, use is preferably made of tubular glass screen, ceramic material and the like. The wall thickness of such a tube is preferably at least 0.2 mm.
The invention will be described with reference to a drawing, the sole figure of which shows an embodiment of the invention.
A straight high-pressure mercury vapor discharge tube is provided with electrodes 2 and 3 of which electrode 2 P CC is connected in the usual manner via a long lead-in and supporting wire 4 with the aid of a bipolar screw cap 6 to oneiend in the drawing end of the evacuated outer envelope 7 surrounding the assembly. A short supporting and leadin wire Sis provided for electrode 3.
In. the embodiment tube 1 is quartz glass and is provided with an ignition electrode 9 connected through a resistor 10 to the conductor 4. The distance between the electrodes 2 and 3 was approximately 50 mm. and the inner volume was approximately 15 cm. The tube 1 contained :60 mgs. of mercury which evaporated completely during normal operation and produced an operating voltage of approximately v. at a minimum wall temperature of approximately 580 C. (at a power of approximately 400 w.). The tube further contained approximately 3 mgs. of sodium iodide 10.3 mg. of thallium iodide and :0.06 mg. of indium iodide per cm.". The ignition gas used was argon at a pressure of approximately 20 mm.Hg.
According to the invention, the nickel wire 4 extending along the discharge tube 1 at a distance of :10 mm. and having a thickness of :2 mm. was surrounded by a tube 8 of an electrically non-conducting ceramic material impervious to ultraviolet radiation. The wall thickness of the tube was aproximately 0.5 mm. and its length was approximately 100 mm. The ceramic material contained i94% by weight of A1 0 and '-6% by weight of SiO Initially, the lamp had a light output of approximately 80 lumens/w. and an ignition voltage of 250 v. After approximately 5000 operating hours, the ignition voltage had increased to 400 v. and the operating voltage to v.; the light output had decreased to 70 lumens/w.
In comparison, a lamp without the ceramic tube 8 but otherwise of the same construction, after an operating time of approximately 1000 hours the ignition voltage had already increased to approximately 500 v. and the operating voltage to approximately v.; the light output had decreased to 50 lumens/w. Brown crystals were found in the discharge tube 1, while the envelope 7 showed a brown discoloration.
The improvement obtained using the ceramic tube 8 is probably due to the fact that the ultraviolet radiation of the tube 1 can no longer release any photo-electrons on the wire 4. Released electrons can reach the outer side of the discharge tube 1, which apparently results in sodium diffusing through the wall of the discharge tube 1 and hence in the occurence of the said disadvantageous phenomena. The same disadvantageous phenomena occur with the use of other alkali metals, for example lithium.
While the invention has been described in connection with a specific embodiment and applications thereof, other modifications will be apparent to those skilled in the art without departing from the spirit and scope of the invention which is defined with greater particularity in the appended claims.
What is claimed is:
1. A high-pressure mercury vapor discharge lamp comprising a discharge tube containing mercury and an alkali iodide, a pair of electrodes at opposite ends of said tube, an outer envelope surrounding and spaced from said tube, at least one conductor extending along the discharge tube and electrically connected tonne of the electrodes, and
an electrically non-conducting screen consisting of a material substantially impervious to ultraviolet radiation surrounding said conductor.
2. A discharge lamp as claimed in claim 1, in which the screen impervious to ultraviolet radiation is a glass tube.
3. A discharge lamp as Claimed in claim 1, in which the screen impervious to ultraviolet radiation is a tube of ceramic material.
4. A discharge lamp as claimed in claim 3, in which the Wall thickness of the tube of ceramic material is at least 0.2 mm., while the material of the ceramic tube contains approximately 94% by weight of A1 0 and approximately 6% by Weight of SiO References Cited UNITED STATES PATENTS 3,424,935 1/1969 Gungle et a1 3l3184 X JAMES W. LAWRENCE, Primary Examiner 10 R. F. HOSSFELD, Assistant Examiner
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6703447A NL6703447A (en) | 1967-03-03 | 1967-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3484637A true US3484637A (en) | 1969-12-16 |
Family
ID=19799460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US708277A Expired - Lifetime US3484637A (en) | 1967-03-03 | 1968-02-26 | Mercury vapour discharge lamp |
Country Status (6)
Country | Link |
---|---|
US (1) | US3484637A (en) |
BE (1) | BE711585A (en) |
DE (1) | DE1639084B2 (en) |
FR (1) | FR1555294A (en) |
GB (1) | GB1186632A (en) |
NL (1) | NL6703447A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4976359A (en) * | 1972-09-22 | 1974-07-23 | ||
US3895248A (en) * | 1969-03-11 | 1975-07-15 | Philips Corp | Gas discharge device with glow discharge igniting structure |
US3996487A (en) * | 1975-05-14 | 1976-12-07 | Westinghouse Electric Corporation | Ceramic discharge lamp with reduced heat drain |
US4281274A (en) * | 1979-08-01 | 1981-07-28 | General Electric Co. | Discharge lamp having vitreous shield |
US4401916A (en) * | 1979-04-03 | 1983-08-30 | U.S. Philips Corporation | High-pressure discharge lamp |
EP0160972A2 (en) * | 1984-05-07 | 1985-11-13 | GTE Products Corporation | High intensity discharge lamp alkali metal loss reduction means |
US4633136A (en) * | 1982-04-20 | 1986-12-30 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | High-pressure discharge lamp with low power input |
DE3735523A1 (en) * | 1986-10-20 | 1988-04-28 | Tungsram Reszvenytarsasag | ALKALI HALOGENIDE AS AN ADDITIONAL METAL HALOGEN DISCHARGE LAMP |
US4866328A (en) * | 1988-04-15 | 1989-09-12 | North American Philips Corp. | Electric lamp with reduced internal photoelectron production |
US4942330A (en) * | 1988-09-30 | 1990-07-17 | Gte Products Corporation | Lamp assembly utilizing shield and ceramic fiber mesh for containment |
US5272407A (en) * | 1991-12-18 | 1993-12-21 | North American Philips Corporation | Electric lamp having screens for reducing photo electron emission |
US5339001A (en) * | 1992-10-15 | 1994-08-16 | North American Philips Corporation | Electric lamp having improved support straps for planar seals |
WO1995010120A1 (en) * | 1993-10-06 | 1995-04-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Metal halogenide discharge lamp |
US20090015162A1 (en) * | 2003-06-30 | 2009-01-15 | Koninklijke Philips Electronics N.V. | Electric Lamp Having Strapless Support Mount for Mh Arc Tubes |
US20100253219A1 (en) * | 2007-05-24 | 2010-10-07 | Auralight International Ab | High pressure sodium lamp |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3619068C2 (en) * | 1986-06-06 | 1996-08-22 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Compact metal halide discharge lamp |
DE9002959U1 (en) * | 1990-03-15 | 1990-05-17 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3424935A (en) * | 1965-04-19 | 1969-01-28 | Sylvania Electric Prod | Harness construction for metal arc type lamp |
-
1967
- 1967-03-03 NL NL6703447A patent/NL6703447A/xx unknown
-
1968
- 1968-02-06 DE DE1968N0032075 patent/DE1639084B2/en active Granted
- 1968-02-26 US US708277A patent/US3484637A/en not_active Expired - Lifetime
- 1968-02-29 GB GB9878/68A patent/GB1186632A/en not_active Expired
- 1968-03-01 BE BE711585D patent/BE711585A/xx not_active IP Right Cessation
- 1968-03-01 FR FR1555294D patent/FR1555294A/fr not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3424935A (en) * | 1965-04-19 | 1969-01-28 | Sylvania Electric Prod | Harness construction for metal arc type lamp |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3895248A (en) * | 1969-03-11 | 1975-07-15 | Philips Corp | Gas discharge device with glow discharge igniting structure |
JPS4976359A (en) * | 1972-09-22 | 1974-07-23 | ||
JPS5245431B2 (en) * | 1972-09-22 | 1977-11-16 | ||
US3996487A (en) * | 1975-05-14 | 1976-12-07 | Westinghouse Electric Corporation | Ceramic discharge lamp with reduced heat drain |
US4401916A (en) * | 1979-04-03 | 1983-08-30 | U.S. Philips Corporation | High-pressure discharge lamp |
US4281274A (en) * | 1979-08-01 | 1981-07-28 | General Electric Co. | Discharge lamp having vitreous shield |
US4633136A (en) * | 1982-04-20 | 1986-12-30 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | High-pressure discharge lamp with low power input |
EP0160972A2 (en) * | 1984-05-07 | 1985-11-13 | GTE Products Corporation | High intensity discharge lamp alkali metal loss reduction means |
EP0160972A3 (en) * | 1984-05-07 | 1987-11-04 | Gte Products Corporation | High intensity discharge lamp alkali metal loss reduction means |
US4843266A (en) * | 1986-10-20 | 1989-06-27 | Tungsram Reszvenytarsasag | Metal-halogen discharge lamp with conically shaped insulating elements in outer envelope |
DE3735523A1 (en) * | 1986-10-20 | 1988-04-28 | Tungsram Reszvenytarsasag | ALKALI HALOGENIDE AS AN ADDITIONAL METAL HALOGEN DISCHARGE LAMP |
US4866328A (en) * | 1988-04-15 | 1989-09-12 | North American Philips Corp. | Electric lamp with reduced internal photoelectron production |
US4942330A (en) * | 1988-09-30 | 1990-07-17 | Gte Products Corporation | Lamp assembly utilizing shield and ceramic fiber mesh for containment |
US5272407A (en) * | 1991-12-18 | 1993-12-21 | North American Philips Corporation | Electric lamp having screens for reducing photo electron emission |
US5339001A (en) * | 1992-10-15 | 1994-08-16 | North American Philips Corporation | Electric lamp having improved support straps for planar seals |
WO1995010120A1 (en) * | 1993-10-06 | 1995-04-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Metal halogenide discharge lamp |
US5729091A (en) * | 1993-10-06 | 1998-03-17 | Patent-Treuhand-Gesellschaft F. Electrische Gluehlampen Mbh | Metal halide discharge lamp |
US20090015162A1 (en) * | 2003-06-30 | 2009-01-15 | Koninklijke Philips Electronics N.V. | Electric Lamp Having Strapless Support Mount for Mh Arc Tubes |
US20100253219A1 (en) * | 2007-05-24 | 2010-10-07 | Auralight International Ab | High pressure sodium lamp |
US8198814B2 (en) * | 2007-05-24 | 2012-06-12 | Auralight International Ab | High pressure sodium lamp with a shielding member between two arc tubes |
Also Published As
Publication number | Publication date |
---|---|
DE1639084B2 (en) | 1976-07-22 |
FR1555294A (en) | 1969-01-24 |
GB1186632A (en) | 1970-04-02 |
BE711585A (en) | 1968-09-02 |
NL6703447A (en) | 1968-09-04 |
DE1639084A1 (en) | 1970-05-27 |
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