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Mercury vapour discharge lamp

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Publication number
US3484637A
US3484637A US3484637DA US3484637A US 3484637 A US3484637 A US 3484637A US 3484637D A US3484637D A US 3484637DA US 3484637 A US3484637 A US 3484637A
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US
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Prior art keywords
tube
discharge
approximately
lamp
material
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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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Henricus Johannes Joseph Boort
Cornelis Adrianus Joann Jacobs
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North American Philips Lighting Corp
Philips Corp
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Philips Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas- or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/30Vessels; Containers
    • H01J61/34Double-wall vessels or containers

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

US3484637A 1967-03-03 1968-02-26 Mercury vapour discharge lamp Expired - Lifetime US3484637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL6703447A NL6703447A (en) 1967-03-03 1967-03-03

Publications (1)

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US3484637A true US3484637A (en) 1969-12-16

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US3484637A Expired - Lifetime US3484637A (en) 1967-03-03 1968-02-26 Mercury vapour discharge lamp

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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)

* Cited by examiner, † Cited by third party
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 metal halide as an additive-containing metal halide 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
DE3735523A1 (en) * 1986-10-20 1988-04-28 Tungsram Reszvenytarsasag Alkali metal halide as an additive-containing metal halide discharge lamp
US4843266A (en) * 1986-10-20 1989-06-27 Tungsram Reszvenytarsasag Metal-halogen discharge lamp with conically shaped insulating elements in outer envelope
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 Type
GB1186632A (en) 1970-04-02 application
NL6703447A (en) 1968-09-04 application
FR1555294A (en) 1969-01-24 grant
DE1639084A1 (en) 1970-05-27 application
DE1639084B2 (en) 1976-07-22 application
BE711585A (en) 1968-09-02 grant

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