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Publication numberUS3180981 A
Publication typeGrant
Publication dateApr 27, 1965
Filing dateOct 5, 1962
Priority dateOct 12, 1961
Publication numberUS 3180981 A, US 3180981A, US-A-3180981, US3180981 A, US3180981A
InventorsUlffers Heinz
Original AssigneeZeiss Ikon Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Air cooled projection lamp
US 3180981 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

A ril 27, 1965 H. ULFFERS AIR COOLED PROJECTION LAMP Filed Oct. 5, 1962 United States Patent 2 Claims. (Cl. 240-47 The invention relates to improvements in projection lamps provided with air cooling means and particularly is directed to a projection lamp which employs as a source of light a high pressure gas discharge lamp whose ignition device is arranged in the lamp housing so as to be subjected to the cooling effect of an air current passing through the lamp housing.

It is an object of the invention to provide a novel method and novel means for effectively cooling not only the high pressure gas discharge lamp in the lamp housing, but also the ignition device and the connecting terminals on the lamp "and the ignition device. This is accomplished by providing means for directing a cooling air current over the ignition device-whereby this cooling air currrent preferably is concentrated upon the HF terminal of the ignition device-to the lamp bulb and the reflecting mirrors associated therewith and from there to a suction discharge opening or channel in the top of the lamp housing.

Another object of the invention is to produce a cooling air currrent by making use of the thermal ascension somewhat preheated which is very favorable for a cool-.

ing of the high pressure gas discharge lamp because the latter will not be hit by an excessively cool air current which would decrease the light capacity relatively to the electricity consumption.

With these and other objects in view the invention will now be described in greater detail with reference to the accompanying drawing, in which:

FIG. 1 illustrates diagrammatically in a side elevational view and with certain parts in section and other parts broken away, an air cooled projection lamp employing a high pressure gas discharge lamp and an ignition device therefor, and

FIG. 2 illustrates a tubular connecting terminal between the ignition device and the lamp and which may be employed in FIG. 1 in place of the connecting terminal provided with the cooling fins.

Referring to FIG. 1, a lamp housing 1 is provided in its rear wall 2 with air inlet apertures 3 and with a vertical partition wall 4 dividing the interior of the lamp housing 1 into a front compartment 5 and a rear compartment 6. The top of the lamp housing 1 is provided with an upwardly directed tubular air discharge channel '7 in which is arranged a suitable suction blower 8 for assisting in the exhaust of the air from the interior of aisassi Patented Apr. 27, 1965 ice the housing 1. In the rearcompartment 6 is arranged anignition device 9. The front compartment 5 has mounted therein the main reflecting mirror 10, the high pressure gas discharge lamp 11 and the auxiliary reflecting mirror 12 with their respective supporting accessories 13.

The ignition device 9 is connected with its HF ter- 7 minal 15 to a conductor 16 leading to the lower terminal 17 of the high pressure gas discharge lamp 11. This HF terminal 15 is provided with cooling fins 18 to facilitate the heat radiation. As illustrated in FIG. 2, a somewhat modified HF terminal may consist of a tubular member 150 provided with apertures 19 in its wall.

The lower portion of the partition 4 is provided with a cut-out 20 through which passes the conductor 16. This cut-out 20 is of sufiicient size that it also permits to pass therethrough the main portion of the air currrent which 1. This main portion of the air current passes overthe ignition device 9, is concentrated upon the HF terminal 15 before it passes through the cut-out 2t) and then passes upwardly along the reflecting mirrors 10 and 12 and the lamp 11 and finally is discharged from the lamp housing 1 by way of the channel 7 with the assistance of the suction blower 8.

A secondary air cooling currrent passes directly from the inlet apertures 3 through the upper portion of the compartment 6 and then through the discharge channel 7 and in this manner vents the compartment 6 containing the ignition device 9.

What I claim is:

l. The combination with a projection lamp housing having front, side and rear walls connected by a top wall, said front Wall being provided with a light emission opening, of a substantially vertical partition spaced between said front and rear walls separating said housing into a front compartment and a rear compartment, a high pressure gas discharge lamp in said front compartment, a reflector in front of said partition for projecting light rays through said light emission opening in said front wall, an ignition device with a HP terminal in said rear compartment connected to said lamp, said high frequency 7 terminal being arranged to extend through a cut-out in whereby a cooling circulatory air currrent is caused to pass first over said ignition device in said rear compartment and its HF terminal and then through said cut-out and upwardly over said high pressure gas discharge lamp and finally through said air exhaust channel.

'2. The combination with a projection lamp housing having front, side and rear walls connected by a top wall, a light emission opening in said front wall, of a substantially vertical partition between said front and rear walls separating said housing into a front compartment and a rear compartment, a high pressure gas discharge lamp in said front compartment, a reflector for directing light rays from said lamp through said light emission opening, an ignition device with a HP terminal in said rear compartment, the lower end of said partition havinga slot adjacent the lower portion of the housing for permitting the passage of an electric conductor from said HF termi- References flirted by the Examiner UNITED STATES PATENTS Dale 339112 Blohm 88-24 Greppin 240--1.4 Critoph et a1 24047 Streich 24047 Wilton 8824 13 NGRTON ANSHER, Primary Examiner.

I. SCHNALL, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1254210 *Apr 3, 1915Jan 22, 1918Dale Lighting Fixture CompanyElectric-light fixture.
US1831762 *Apr 2, 1927Nov 10, 1931Trans Lux Daylight PictureVentilating system for projectors
US2069950 *Nov 2, 1933Feb 9, 1937Ernest H GreppinSurgical lamp
US2278916 *Apr 13, 1940Apr 7, 1942Spencer Lens CoIlluminating device
US2431520 *Feb 20, 1945Nov 25, 1947Bruning Charles Co IncPhotoprinting machine
US3117489 *Oct 14, 1960Jan 14, 1964American Optical CorpImage projector with air circulating means
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3564231 *Sep 26, 1968Feb 16, 1971Poly OpticsIllumination device
US3703635 *Sep 8, 1970Nov 21, 1972E Systems IncZoom light
US3733481 *Jun 11, 1970May 15, 1973Bausch & LombFiber optics light source
US4092705 *Jul 29, 1975May 30, 1978Medical Products Octagon AbMethod of illuminating an object and a device for carrying out the method
US4321659 *Jun 30, 1980Mar 23, 1982Wheeler Ernest ENarrow-band, air-cooled light fixture
US4356535 *Sep 17, 1980Oct 26, 1982Chu Chung SModern fan device
US4701833 *Jul 16, 1986Oct 20, 1987Vari-Lite, Inc.Ventilation system for stage light instrument
US4886328 *May 27, 1986Dec 12, 1989Yazaki CorporationDisplay apparatus for vehicle with means to prevent solar heating thereof
US4935853 *Feb 3, 1989Jun 19, 1990Collins William JMotion-controlled light with arc lamp
US6575599 *Aug 30, 1999Jun 10, 2003Ushiodenki Kabushiki KaishaLight source device for projection apparatus
US6739831 *Jun 20, 2002May 25, 2004Coretronic CorporationCooling device for projector
US6783248Jun 26, 2001Aug 31, 2004Matsushita Electric Works, Ltd.Image display apparatus
US7144140 *Feb 25, 2005Dec 5, 2006Tsung-Ting SunHeat dissipating apparatus for lighting utility
US7397384Feb 11, 2005Jul 8, 2008Genlyte Thomas Group, LlcTrack lighting system current limiting device
US7465077Sep 21, 2007Dec 16, 2008Genlyte Thomas Group, LlcRetention spring for luminaire reflector
US7513675May 5, 2005Apr 7, 2009Genlyte Thomas Group LlcModular luminaire system with track and ballast attachment means
US7740378 *Nov 8, 2006Jun 22, 2010Lumenis Ltd.Device and system for an optical element holder
US7911351Jun 26, 2008Mar 22, 2011Genlyte Thomas Group LlcTrack lighting system current limiting device
US7914198Mar 26, 2009Mar 29, 2011Gentyle Thomas Group LLCModular luminaire system
US8100562 *Dec 23, 2009Jan 24, 2012Lumenis Ltd.Device and system for an optical element holder
US8144025Feb 11, 2011Mar 27, 2012Genlyte Thomas Group LlcTrack lighting system current limiting device
WO2002031593A1 *Oct 10, 2001Apr 18, 2002Baard Eker Ind Design AsCooling device in a projector
WO2008092503A1 *Jan 31, 2007Aug 7, 2008Osram GmbhReflector lamp
Classifications
U.S. Classification362/294, 353/61
International ClassificationG03B21/20, G03B21/16
Cooperative ClassificationG03B21/20, G03B21/16
European ClassificationG03B21/16, G03B21/20