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Publication numberUS1698691 A
Publication typeGrant
Publication dateJan 8, 1929
Filing dateJul 1, 1926
Priority dateJul 1, 1926
Publication numberUS 1698691 A, US 1698691A, US-A-1698691, US1698691 A, US1698691A
InventorsButtolph Leroy J
Original AssigneeCooper Hewitt Electric Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
High-intensity induction lamp
US 1698691 A
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Description  (OCR text may contain errors)

Jan. 8, 1929. 1,698,691 U L. 'J. BUTTOLPH HIGH INTENSITY INDUCTION LAMP Filed July 1, 1926 HIS ATTORNEY Patented Ja.-8,1929.


The present invention relates to electric lamps in which a gas or vapor is brought to luminescence'by inducing therein the flow of a high frequency alternating current. The invention relates more particularly to lamps of this type in which a high intensity dis charge is produced." It further relates to meansfor aiding in the starting of a lamp of this type. The invention also relates to an induction lamp for producing ultra violet light of high intensity and concentrations adapted for easy manipulation and for the application of high intensity light to localized areas for use in the therapeutic field and 15, in the arts generally.

to be as generic in their applicationto similar parts as'the art will permit.

In the accompanying drawings I have shown for purposes of illustration one form of apparatus with certain I modifications thereof embodying the invention, in which Fig. 1 is an elevation view in part section of a vapor lamp having a gas enclosing envelope in the form of a pair of bulbs connected by a constricted tube about which is mounted a high frequency induction coil of comparatively small diameter; and a light ap-- 4 plicator in operative relation to a particular window portion of the lamp, Fig. 2 is-an elevation view of a similar device with a water cooled applicator, I Fig. '3 is a sectional view taken along the line 33 ofFig.2, e

Fig. 4 is a diagrammatic view in elevation showing a single bulb lamp. I

i In Figs. 1, 2 and 3 of the drawings the en velope 1 which is of glass, quartz or the like 4' is in the form of two bulbs 3 and 4 whichare connected by the short tube 6.- Positioned transversely in tube 6 is the broken ring 8 which is held in position by the lugs or annular corrugations 9 formed on theinner sur- HIGH-INTENSITY INDUCTION LAMP.

1926. Serial No. 119,921.-

' the tube 6 is the re-entrant tube 10 which carriesat its inner end the window 12. This unit 12 is formed of glass, quartz or the like in accordance with the nature of the light desired to be transmitted therethrough. In the envelope is a quantity of mercury 13. The high frequency coil 15 has connected in series therewith the condenser 16 and across the tube isthe spark gap 18, the leads 20'serving for connection to a suitable source of high voltage alternating current not shown. The rod 21 of quartz or glass serves as a light apphcator in that it transmits light rays from the inner or receiving end to the other or dispensing end, as is now well known in therapy, and is movable into tube 10 and into close proxim ty to window 12 in accordance with operating conditions and with the intensity of light desired to be applied. In Fig. 2 is shown; diagrammatically a water cooled light filter 22 of the well known type mounted to the light applicator 21". The tubes 23 and 24 serve to carry cooling fluid to and from the cell of the filter to remove heat absorbed from the light by the fluid of the filter.

The modification shown in Fig. 4 has an envelope which comprises a bulb 30 which" carriesa short tube 31 which connects there- .with and which in turn carries at its outer end a window 33 of quartz or other light trans- 'mitting material. In the envelope near the inner end of the tube 31 is mounted the broken ring 35 similar to ring 8 of Figs. 1 to 3. The

" high frequency coil 36' positioned about tube 31 is connected to a high frequency circuit comprising a high voltage generator 38, the spark gap 39 and the condenser 40. A filling of a gas or vapor is supplied in the en velope such as neon, argon, mercury or any other suitable gas or mixtures of gases.

In the use of the apparatus of this invention the high frequency coils, 15 or 36 are energized in a manner well known in the art to induce a current flow in the gas or vapor of the lamp envelope to bring about a radiant discharge therefrom. The broken ring 8 .or 35 serves to. aid in the starting-ofthe discharge by having induced therein a current flow which passes from one end of the. ring to the other and jumps the space between the tively energizes the gas or vapor and brings it up tain sufiicient acceleration to brlng aboutradiation producing conditions and to provide' cooling area for. the lamp1 for securthe'ring 8 or ing proper operatingpressures t rein. The

' windowsl2 and 33 are positioned close to the high intensity light produced within or at the ,t'ubesb or'31to secure an efiicient light transmission from the high intensity space. This cld'se' positioning to the high intensity spot. in thelamp has the further advantage )5 avoiding clouding of'thewindow by conden's'ation of vaporthereon when material such as mercury is used because thehigh temeratureat this point will prevent such con ensation. .7

It is to lie-understood that when desired 35 is dispensed with and starting'and operating ofthe lamp attainedsolely through the direct effect of the magnetic currents upon the vapor or gas in the envelope.

It is further to be understood that instead of a broken ring a closed coil of one or more turns maybe used in accordance with the invention set forth in my copending application Serial Number 105,951 filed May 1, 1926.

While I have shown and described and have pointed out infthe annexed claims cernovel features of.v the invention, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation may be made b those skilled in the art without departing om the spirit of the-invention.

' stricte I claim- 1 ,1. In a vapor electric lamp of the induction type, a sealed envelope having a dischar e supporting gas orvapor therein, said .enve ope having a constricted portion adapted for the application of the high frequency induction coil, and a ring of'electrically conducting material sitioned within the conportion 0 the envelope. 2. In a vapor electric lamp of the induction type, a sealed envelope having a transparent window apd a discharge supporting tion type, in combination a sealed envelope gas or vapor therein, said envelope having a constricted portion adapted for the. application of a high frequency induction coil, said window being located in the high temperature area and adjacent said constricted opening.

3. In a vapor electric lam of the induction type, a sealed envelope aving a transparent window,

or vapor therein, said envelope having a constricted portion adapted for the application I of the high freqpency'induction coil, and a ring of electrical y conducting material ositioned within the constricted portion 10 the envelope. v 4. In a vapor electric lam of the induction type, a sealed envelope having a transparent reentrant window and a discharge supporting gas or vapor therein, s'aid envelope having a constricted ortion adapted for the application of a big frequency induction coil, said transparent window being positioned in closeproximity portion ofthe envelope.

5. In a vapor'electric lamp of the inducto said constrlcted comprising two enlarged portions joined by a constricted passage, a transparent reentrant window formed in the wallof the envelope having said constricted passageway, and a filling of a discharge sup-porting gas or vapor in the envelope.

6. In a vapor electric 1am of the induction type,'a sealed envelope 0 vitreous mat'erial in the form of two bulbs joined by a constricted passageway, a re-entrant tube extending inwardly from the wall of one of said bulbs to within a short distance of said constricted passageway and carrying at its inner end a transparent window, a discharge supporting gas or vapor in the envelope, and a coil of electrically conducting materia-l'positioned in said constricted passageway and haying its ends terminating close to each 0 er.

tion type, a sealed envelope of quartz like material in the form of two connecting bulbs joined by a strictured passageway, a broken ring positioned in said strictured passageway transversely thereof, and having its ends ter-.

minating Within a short distance of each other, said envelope having a portiontrans- Q a quantity of 116 parent to ultra violet light, and mercury in said envelope.

Signed at Hoboken in the county of End-- son and State of. NewJersey this 25th day of June, A. D. 1926.


a discharge sup-porting gas +0- 7. In a vapor electric lamp of the induc-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2449880 *May 16, 1945Sep 21, 1948Durotest CorpLight source
US2484332 *Sep 9, 1944Oct 11, 1949Capita Emil RUltraviolet light apparatus
US2919370 *Oct 28, 1958Dec 29, 1959Plasmadyne CorpElectrodeless plasma torch and method
US2939049 *May 29, 1958May 31, 1960Plasmadyne CorpApparatus for generating high temperatures
US2953718 *May 1, 1958Sep 20, 1960Plasmadyne CorpApparatus and method for generating high temperatures
US3055262 *Feb 24, 1959Sep 25, 1962Plasmadyne CorpSpectroscopic light source and method
US3138739 *Dec 26, 1961Jun 23, 1964Gen Technology CorpElectrodeless lamp having a sheathed probe
US3311775 *Aug 27, 1963Mar 28, 1967Gtc KkGaseous discharge lamp with stabilizing arrangement
US3693044 *Dec 24, 1970Sep 19, 1972Honeywell IncFiring means for discharge tubes
US4504768 *Jun 30, 1982Mar 12, 1985Fusion Systems CorporationElectrodeless lamp using a single magnetron and improved lamp envelope therefor
U.S. Classification313/161, 315/57, 315/248, 313/608, 313/565, 250/503.1, 315/344
International ClassificationH01J65/04
Cooperative ClassificationH01J65/048
European ClassificationH01J65/04A3