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Publication numberUS3590307 A
Publication typeGrant
Publication dateJun 29, 1971
Filing dateDec 31, 1969
Priority dateJan 8, 1969
Publication numberUS 3590307 A, US 3590307A, US-A-3590307, US3590307 A, US3590307A
InventorsAlexander Dobrusskin, Achim Lange
Original AssigneePatra Patent Treuhand
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Additive-type high-pressure mercury-vapor discharge device having good ultraviolet output
US 3590307 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

United States Patent 72] Inventors Alexander Dobrusskin Tauikirchen;

Achim Lange, Munich, both of, Germany 889,600

Dec. 31, l969 June 29, 1971 Patent-Treuhand-Gesellschaft Fur Elektrische (iluhlampen m.b.H.

[2l 1 Appl. No [22] Filed [45] Patented [73] Assignee Munich, Germany [32] Priority Jan. 8, 1969 [33] Germany [31] P19 00765.9

[54] ADDlTlVE-TYPE HIGH-PRESSURE MERCURY- VAPOR DISCHARGE DEVICE HAVING GOOD ULTRAVIOLET OUTPUT 4 Claims, 1 Drawing Fig.

[52] U.S.Cl. 313/184, 3 l 3/225, 313/229 Primary Examiner- Roy Lake Assistant Examiner- Palmer C. Demeo Attorneys-A. T. Stratton, W. D. Palmer and D. S. Buleza ABSTRACT: A high-pressure mercury-vapor discharge device having improved ultraviolet output and maintenance of initial output during operation comprise a radiation-transmitting are tube having a fill consisting of inert ionizable starting gas, a predetermined charge of mercury, iron, halogen (preferably iodine) as required to react with the iron to form ferrous halide, and stannic halide (preferably the iodide).

ADDITlVE-TYPE HIGH-PRESSURE MERCURY-VAPOR DISCHARGE DEVICE HAVING GOOD ULTRAVIOLET OUTPUT BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION In accordance with the present invention in addition to the usual inert starting gas and mercury, the arc tube contains an additive of Fe and Sn-halide. Operation of the device is particularly good when the additive is composed of an amount of from 0.01 to l mgr./cc., preferably 0.03 mgr./cc. of metallic Fe, an amount of halogen equivalent to the Fe-(lI)-halide, and from 0.006 to 0.06 mgr./cc., preferably 0.06 mgr./cc. of Sn- (lV)-halide, preferably Sn-iodide.

BRIEF DESCRIPTION OF THE DRAWING Referring to the drawing which shows an exemplary embodiment of the present invention, the sole FIG. illustrates a discharge device fabricated in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT The FIG. shows an embodiment of the radiator according to the invention. Each end of the discharge tube 8 of quartz glass is provided with a vacuum-tight foil seal 3, 4 whereby the mandrel wires of electrodes 9, 10 of well-known activated refractory material are connected to the lead-in wires 5,6. The ends of radiation transmitting tube 8 are provided with a reflecting coating 11 of ZrO The discharge tube 8 has an inner diameter of mm., the electrode spacing is 48 mm., and the volume is about 16 cc. The discharge tube 8 is filled with about 30 mgrs., of Hg., 0.5 mgr. of metallic Fe and an amount of iodine equivalent to the Fe-(lI)-halide, l mgr. of Sn-(IV)- iodide, and with 20 Torr of argon as the basic inert ionizable starting gas. The are tube is operated from 3.5 amps. and 125 v. and a loading of 400 w. The mercury is present in predetermined amount and completely vaporizes during operation of the device.

The spectrum of a radiator with an arc tube filled with Hg. and Fe-halide is hardly affected by the present addition of Sniodide. However, the substantial advantage resulting from the Sn-iodide is that the inevitable decrease of UV-radiation output during operational life of the radiator is considerably reduced. Thus the UV-radiation output is, for example, still constant after more than 100 hours of operation. Compared to a similar conventional mercury lamp without any halide additive, the overall output is increased and, moreover, the relative proportion of ultraviolet radiation in the range of wavelengths from 315 nm. and 380 nm. to the range of wavelengths from 280 nm. to 315 nm. is increased.

We claim as our invention:

1. A high-pressure mercury-vapor discharge lamp of the additive type and having improved ultraviolet output and improved maintenance, said device comprising a radiation-transmitting arc tube of predetermined volume and electrodes operatively disposed proximate the ends thereof, said arc tube having a fill consisting of inert ionizable starting gas, a charge of mercury in predetermined amount which is completely vaporized during operation of said device, a predetermined amount of iron, a predetermined amount of halogen as required to form ferrous halide with said iron, and a predetermined amount of stannic halide.

2. The device as specified in claim 1, wherein said iron is present in amount of from 0.01 to l milligram per cc. of arc tube volume, said halogen is present in amount as required to form ferrous halide with said iron, and said stannic halide is present in amount offrom 0.006 to 0.6 milligram per cc. of arc tube volume.

3. The device as specified in claim 2, wherein said halogen is iodine and said stannic halide is stannic iodide.

4. The device as specified in claim 3, wherein said iron is present in amount of about 0.03 milligram per cc. of arc tube volume, said iodine is present in amount as required to form ferrous iodide with said iron, and said stannic iodide is present in amount of about 0.06 milligram per cc. ofarc tube volume.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3234421 *Jan 23, 1961Feb 8, 1966Gen ElectricMetallic halide electric discharge lamps
US3521110 *Sep 25, 1967Jul 21, 1970Gen ElectricMercury-metallic halide vapor lamp with regenerative cycle
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3896326 *Jul 19, 1973Jul 22, 1975Gte Sylvania IncMetal halide discharge lamp having expanded section arc tube
US4074164 *Mar 24, 1977Feb 14, 1978Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen MbhSun lamp
US4155025 *Apr 24, 1978May 15, 1979Patent-Treuhand-GesellschaftHigh-pressure mercury-vapor discharge ultraviolet radiant energy lamp
US4243906 *Jun 22, 1978Jan 6, 1981U.S. Philips CorporationHigh pressure mercury vapor discharge lamp
US4298005 *Jul 5, 1979Nov 3, 1981Mutzhas Maximilian FRadiation apparatus
US4929869 *Nov 10, 1988May 29, 1990Kabushiki Kaisha ToshibaHigh intensity discharge lamp containing iron and silver in the arc tube filling
US5416383 *May 11, 1994May 16, 1995Patent-Treuhand Gesellschaft Fuer Elektrische Gleuhlampen MbhHigh-pressure discharge lamp and low-noise lamp operating system
US5594302 *Aug 22, 1995Jan 14, 1997Lamptech Ltd.Metal halide lamp including iron and molybdenum
US8749138 *Jan 2, 2012Jun 10, 2014Iwasaki Electric Co., Ltd.Metal halide lamp
US20040031675 *Aug 12, 2003Feb 19, 2004Exciton, Inc.Process of quadricyclane production
US20130285535 *Jan 2, 2012Oct 31, 2013Iwasaki Electric Co., Ltd.Metal halide lamp
DE3838322A1 *Nov 11, 1988May 24, 1989Toshiba Kawasaki KkHochleistungs-entladungslampe
EP0063441A1 *Apr 2, 1982Oct 27, 1982Mitsubishi Denki Kabushiki KaishaElectrodeless discharge lamp
Classifications
U.S. Classification313/144, 313/642
International ClassificationH01J61/18, A61N5/06
Cooperative ClassificationA61N5/06, H01J61/18
European ClassificationA61N5/06, H01J61/18