US2618738A - Air cooled light projector - Google Patents

Air cooled light projector Download PDF

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Publication number
US2618738A
US2618738A US169697A US16969750A US2618738A US 2618738 A US2618738 A US 2618738A US 169697 A US169697 A US 169697A US 16969750 A US16969750 A US 16969750A US 2618738 A US2618738 A US 2618738A
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Prior art keywords
main reflector
compartment
reflector
air
socket
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Expired - Lifetime
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US169697A
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John P Foulds
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General Electric Co
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General Electric Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/20—Fastening; Joining with threaded elements

Definitions

  • My invention relates to light projectors, and more particularly to cooling means for floodlighting projectors and the like.
  • FIG. 1 is a side elevational view, partly in section, of a fioodlight projector embodyin my invention
  • Fig. 2 is a fragmentary end elevational view of the projector shown at Fig. 1
  • Fig. 3 is a cross-sectional view taken along the line 3-3 of Fig. 1.
  • a light projector comprising a divergent main reflector I' having a mounting collar 2, a cup-shaped socket housing 3 fixed to the mounting collar, and an air recirculating conduit 4 externally connecting the reflector l with the interior of the collar 2.
  • the entire projector is pivotally mounted between the side arms of a mounting yoke 5 by means of oppositely disposed trunnions 2a projecting from the sides of the collar 2.
  • the main reflector I is generally conoidal in shape, having a narrow eccentric neck portion la and diverging toward a wide mouth portion lb.
  • the mouth portion of the reflector is closed by a cover glass 6.
  • the collar 2 is connected at one end to the neck portion la of the main reflector and closed at its other end by the socket housing 3.
  • the socket housing 3 is provided with a lamp socket 'l, and the mounting collar 2 serves to encase the neck portion of an incandescent lamp 8 mounted in the socket 1.
  • the axis of the mounting collar 2 is disposed at an obtuse angle with respect to the axis of the conoidal main reflector I.
  • the main reflector I, collar 2 and socket housing 3 together thus constitute a closed casing which may be generally regarded as including a main reflector compartment on one side of the reflector neck Ia, and a socket compartment on the other side.
  • auxiliary reflector 9 which extends generally across the neck portion of the main reflector and serves as a dividing wall between the main reflector compartment and the socket compartment.
  • the auxiliary reflector is centrally apertured to accommodate the neck of the lamp 8, which extends from the socket I, through collar 2 and the auxiliary reflector 9, into the main reflector compartment.
  • the ring-shaped auxiliary reflector 9 is radially spaced from the neck la of the main reflector I, thereby to permit passage of air from the socket compartment into the main reflector compartment; and the auxiliary reflector is so shaped that air passin from the socket compartment into the main reflector compartment is directed into intimate contact with the bulb portion of the lamp 8 and the closely adjacent main reflector areas.
  • the reflector 9 is supported upon a plurality of mounting brackets- IU fixed upon bosses II on the socket housing 3.
  • an air cooling and return conduit 4 including a finned recirculating pipe l2 and a fan housing l3.
  • This air cooling conduit 4 is connected between the mouth portion lb of the main reflector l and the tubular mounting collar 2.
  • the recirculating pipe is connected at one end to the mouth portion lb of the main reflector and at the other end to the inlet side of the fan casing [3.
  • the outlet side of the fan casing is connected to the collar 2 at the side thereof, thereby to introduce air transversely into the socket compartment and in a direction substantially perpendicular to the neck of the lamp 8, i. e., radially.
  • the recirculating pipe I2 is provided both interiorly and exteriorly with cooling fins 12a, and is divided longitudinally into two sections which are bolted together in the manner indicated at Fig. 3.
  • centrifugal blower l4 driven by a motor IS.
  • blower [4 draws air from the recirculating pipe [2 and exhausts it into the socket compartment through the collar 2, so that air is continuously circulated from the socket compartment into the main reflector compartment and back through the air cooling conduit 4. Air traversing this closed path is cooled in the recirculating pipe 12 and introduced into the socket compartment transversely across the neck of the lamp 8. The air is then directed by the auxiliary reflector 9 into the main reflector compartment in intimate contact with the bulb portion of the lamp 8 and the narrow reflector portion near the reflector neck. The air heated up in its passage through the socket and main reflector compartments is exhausted from the main reflector compartment into the recirculating pipe [2 for recooling.
  • the coolest air is introduced into the hottest part of the projector casing, and is directed by the auxiliary reflector 9 into the most useful path in its passage through the casing.
  • the air thus passing at considerable velocity through the closed projector casing serves to evenly distribute the heat within the casing
  • the cooling is done by means of recirculated air, so that the entire system is sealed and closed to the atmosphere. This prevents the accumulation within the reflector casing of dust and dirt which would otherwise rapidly decrease the light projection efliciency of the unit.
  • a divergent main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover
  • enclosure means including a lamp socket housing and providing a socket compartment externally adjacent said neck portion of said main reflector, said main reflector and said enclosure means constituting a closed projector casing
  • said means including an air conduit external of said casing for circulating air in a closed path from said socket compartment to said mouth portion of said reflector and back through said conduit, air from said conduit entering said socket compartment in a direction substantially perpendicular to the neck of a lamp mounted therein and in the region thereof, and an annular auxiliary reflector mounted interiorly of said casing and partially closing the neck portion-of said main reflector, said auxiliarv reflector being apertured to accommodate the neck of a lamp mounted in said socket housing and being shaped to direct ,air from said socket compartment into said main reflector in intimate contact with said lamp and main reflector.
  • a divergent main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover, a lamp socket housing and a mounting collar connected to said neck portion and constituting with said main reflector a closed projector casing, a ring-shaped auxiliary reflector disposed at the neck portion of said main reflector and dividing said casing into a main reflector compartment and a socket compartment, said auxiliary reflector being centrally apertured to accommodate the neck of a lamp extending through said socket compartment and into said main reflector compartment and being shaped to direct air from said socket compartment into said main reflector compartment in intimate contact with said lamp, an air cooling conduit external of said casing connecting said mouth portion of said main reflector with said socket compartment, said conduit being connected to said mounting collar to introduce air into said socket compartment in a direction substantially perpendicular to the neck of said lamp, and a circulating fan for continuously recirculating air from said socket compartment to said main reflector compartment and back through said cooling conduit.
  • a conoidal main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover, a tubular mounting collar fixed to said neck portion of said main reflector with the axes of said collar and said main reflector relatively angularly disposed, a cup-shaped socket housing fixed to said collar and providing with said collar and main reflector a closed projector casing.
  • a ring-shaped auxiliary reflector mounted interiorly of said casing across said neck portion of said main reflector and dividing said casing into a main reflector compartment and a socket compartment
  • said auxiliary reflector being centrally apertured to accommodate the neck of a lamp mounted in said socket housing and extending into said main reflector compartment and being shaped to direct air from said socket compartment into said main reflector compartment in intimate contact with said lamp
  • an air cooling conduit external of said casing connecting said mouth portion of said main reflector with said mounting collar, said cooling conduit being con nected to said collar to introduce air into said socket compartment in a direction substantially perpendicular to the neck of said lamp
  • an air circulating fan mounted in said conduit continuously to circulate air from said socket compartment into said main reflector compartment and back through said cooling conduit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Description

Nov. 18, 1952 J. P. FOULDS AIR 000w) LIGHT PROJECTOR Filed June 22, 1950 Inventor: John F. Foulcls,
W MW His Attorney.
Patented Nov. 18, 1952 UNITED STATES PATENT OFFICE AIR COOLED LIGHT PROJECTOR John P. Foulds, Revere, Mass., assignor to General Electric Company, a corporation of New York 3 Claims.
My invention relates to light projectors, and more particularly to cooling means for floodlighting projectors and the like.
It is a general object of my invention to provide means for appreciably increasing the energy output and wattage rating of light projectors, such as floodlights and the like, without increasing their physical size.
It is another object of my invention to provide new and improved air recirculating and cooling means for floodlight projectors and the like.
It is a still further object of my invention to provide new and improved means for evenly distributing generated heat in a floodlight projector and the like, thereby to minimize critical hot spots and permit an increase in rating.
My invention itself will be more fully understood and its various objects and advantages further appreciated by referring now to the following detailed specification taken in conjunction with the accompanying drawing, wherein Fig. 1 is a side elevational view, partly in section, of a fioodlight projector embodyin my invention; Fig. 2 is a fragmentary end elevational view of the projector shown at Fig. 1; and Fig. 3 is a cross-sectional view taken along the line 3-3 of Fig. 1.
Referring now to the drawing in detail, I have shown a light projector comprising a divergent main reflector I' having a mounting collar 2, a cup-shaped socket housing 3 fixed to the mounting collar, and an air recirculating conduit 4 externally connecting the reflector l with the interior of the collar 2. The entire projector is pivotally mounted between the side arms of a mounting yoke 5 by means of oppositely disposed trunnions 2a projecting from the sides of the collar 2.
Apart from the air recirculating conduitv 4, the light projector shown in the drawing is generally similar to that described and claimed in Patent 2,327,820-Rogers. The main reflector I is generally conoidal in shape, having a narrow eccentric neck portion la and diverging toward a wide mouth portion lb. The mouth portion of the reflector is closed by a cover glass 6. The collar 2 is connected at one end to the neck portion la of the main reflector and closed at its other end by the socket housing 3. The socket housing 3 is provided with a lamp socket 'l, and the mounting collar 2 serves to encase the neck portion of an incandescent lamp 8 mounted in the socket 1. In the illustrated embodiment of the invention, the axis of the mounting collar 2 is disposed at an obtuse angle with respect to the axis of the conoidal main reflector I. The main reflector I, collar 2 and socket housing 3 together thus constitute a closed casing which may be generally regarded as including a main reflector compartment on one side of the reflector neck Ia, and a socket compartment on the other side.
Interiorly of the projector casing, and in the region of the main reflector neck portion la, there is mounted a ring-shaped auxiliary reflector 9 which extends generally across the neck portion of the main reflector and serves as a dividing wall between the main reflector compartment and the socket compartment. The auxiliary reflector is centrally apertured to accommodate the neck of the lamp 8, which extends from the socket I, through collar 2 and the auxiliary reflector 9, into the main reflector compartment. The ring-shaped auxiliary reflector 9 is radially spaced from the neck la of the main reflector I, thereby to permit passage of air from the socket compartment into the main reflector compartment; and the auxiliary reflector is so shaped that air passin from the socket compartment into the main reflector compartment is directed into intimate contact with the bulb portion of the lamp 8 and the closely adjacent main reflector areas. The reflector 9 is supported upon a plurality of mounting brackets- IU fixed upon bosses II on the socket housing 3.
Externally of the closed casing constituted by the main reflector I, the collar 2, and the socket housing 3, I provide an air cooling and return conduit 4 including a finned recirculating pipe l2 and a fan housing l3. This air cooling conduit 4 is connected between the mouth portion lb of the main reflector l and the tubular mounting collar 2. The recirculating pipe is connected at one end to the mouth portion lb of the main reflector and at the other end to the inlet side of the fan casing [3. The outlet side of the fan casing is connected to the collar 2 at the side thereof, thereby to introduce air transversely into the socket compartment and in a direction substantially perpendicular to the neck of the lamp 8, i. e., radially.
The recirculating pipe I2 is provided both interiorly and exteriorly with cooling fins 12a, and is divided longitudinally into two sections which are bolted together in the manner indicated at Fig. 3.
Within the fan housing l3 there is disposed a centrifugal blower l4 driven by a motor IS. The
blower [4 draws air from the recirculating pipe [2 and exhausts it into the socket compartment through the collar 2, so that air is continuously circulated from the socket compartment into the main reflector compartment and back through the air cooling conduit 4. Air traversing this closed path is cooled in the recirculating pipe 12 and introduced into the socket compartment transversely across the neck of the lamp 8. The air is then directed by the auxiliary reflector 9 into the main reflector compartment in intimate contact with the bulb portion of the lamp 8 and the narrow reflector portion near the reflector neck. The air heated up in its passage through the socket and main reflector compartments is exhausted from the main reflector compartment into the recirculating pipe [2 for recooling. By this arrangement, the coolest air is introduced into the hottest part of the projector casing, and is directed by the auxiliary reflector 9 into the most useful path in its passage through the casing. The air thus passing at considerable velocity through the closed projector casing serves to evenly distribute the heat within the casing,
thereby minimizing the generation of critical hot spots in the projector. Moreover, the cooling is done by means of recirculated air, so that the entire system is sealed and closed to the atmosphere. This prevents the accumulation within the reflector casing of dust and dirt which would otherwise rapidly decrease the light projection efliciency of the unit.
While I have described a preferred embodiment of my invention by way of illustration, many modifications will occur to those skilled in the art and I, therefore, wish to have it understood that I intend in the appended claims to cover all such modifications as fall within the true spirit and scope of my invention.
What I claim as new and desire to secure by Letters Patent of the United States is:
1. In a light projector, a divergent main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover, enclosure means including a lamp socket housing and providing a socket compartment externally adjacent said neck portion of said main reflector, said main reflector and said enclosure means constituting a closed projector casing,
means including an air conduit external of said casing for circulating air in a closed path from said socket compartment to said mouth portion of said reflector and back through said conduit, air from said conduit entering said socket compartment in a direction substantially perpendicular to the neck of a lamp mounted therein and in the region thereof, and an annular auxiliary reflector mounted interiorly of said casing and partially closing the neck portion-of said main reflector, said auxiliarv reflector being apertured to accommodate the neck of a lamp mounted in said socket housing and being shaped to direct ,air from said socket compartment into said main reflector in intimate contact with said lamp and main reflector.
2. In a light projector, a divergent main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover, a lamp socket housing and a mounting collar connected to said neck portion and constituting with said main reflector a closed projector casing, a ring-shaped auxiliary reflector disposed at the neck portion of said main reflector and dividing said casing into a main reflector compartment and a socket compartment, said auxiliary reflector being centrally apertured to accommodate the neck of a lamp extending through said socket compartment and into said main reflector compartment and being shaped to direct air from said socket compartment into said main reflector compartment in intimate contact with said lamp, an air cooling conduit external of said casing connecting said mouth portion of said main reflector with said socket compartment, said conduit being connected to said mounting collar to introduce air into said socket compartment in a direction substantially perpendicular to the neck of said lamp, and a circulating fan for continuously recirculating air from said socket compartment to said main reflector compartment and back through said cooling conduit.
3. In a light projector, a conoidal main reflector having a narrow neck portion and a wide mouth portion provided with a light transmitting cover, a tubular mounting collar fixed to said neck portion of said main reflector with the axes of said collar and said main reflector relatively angularly disposed, a cup-shaped socket housing fixed to said collar and providing with said collar and main reflector a closed projector casing. a ring-shaped auxiliary reflector mounted interiorly of said casing across said neck portion of said main reflector and dividing said casing into a main reflector compartment and a socket compartment, said auxiliary reflector being centrally apertured to accommodate the neck of a lamp mounted in said socket housing and extending into said main reflector compartment and being shaped to direct air from said socket compartment into said main reflector compartment in intimate contact with said lamp, an air cooling conduit external of said casing connecting said mouth portion of said main reflector with said mounting collar, said cooling conduit being con nected to said collar to introduce air into said socket compartment in a direction substantially perpendicular to the neck of said lamp, and an air circulating fan mounted in said conduit continuously to circulate air from said socket compartment into said main reflector compartment and back through said cooling conduit.
JOHN P. FOULDS.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,286,269 Foley Dec. 3, 1918 1,634,399 Dake July 5, 1927 1,681,153 Johnston Aug. 14, 1928 1,895,887 Lorenz Jan. 31, 1933 1,905,811 Culver Apr. 25, 1933 2,288,345 De Vry et a1 June 30, 1942 2,295,863 Paradis Sept. 15, 1942 FOREIGN PATENTS Number Country Date 750,412 France May 22, 1933
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913573A (en) * 1957-05-08 1959-11-17 Gen Electric Light projector
US2933596A (en) * 1958-02-27 1960-04-19 Gen Electric Luminaires provided with cooling systems
US3309565A (en) * 1959-12-14 1967-03-14 Mc Graw Edison Co Light output of fluorescent lamps automatically held constant by means of peltier type coolers
US3476925A (en) * 1967-07-27 1969-11-04 Hubbell Inc Harvey Floodlight reflector assembly
US3541324A (en) * 1967-12-18 1970-11-17 Berkey Photo Inc Ventilated light unit with roller curtain shutter
US4974132A (en) * 1990-01-22 1990-11-27 Daniel Naum Light trap for arc lamp ventilating system
US6070657A (en) * 1994-03-24 2000-06-06 Hoval Interliz Ag Heat exchanger tube for heating boilers
US20030081186A1 (en) * 2001-10-31 2003-05-01 Hooper Kevin C. Image projector for use with luminaires
US20070041196A1 (en) * 2005-08-16 2007-02-22 Sony Corporation Heat radiating structure for use in image projecting apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1286269A (en) * 1918-02-14 1918-12-03 William Vincent Foley Apparatus for motion-picture projection and other purposes.
US1634399A (en) * 1924-10-27 1927-07-05 Charles W Dake Electric-light housing
US1681153A (en) * 1923-12-13 1928-08-14 Westinghouse Electric & Mfg Co Flood light
US1895887A (en) * 1929-12-20 1933-01-31 Westinghouse Lamp Co Incandescent electric lamp
US1905811A (en) * 1929-11-12 1933-04-25 Wired Radio Inc Cooling system for vacuum tubes
FR750412A (en) * 1932-05-07 1933-08-10 G Leroy Et P Pougin Sa Des Ets Lighting fixtures improvements
US2288345A (en) * 1940-05-31 1942-06-30 Vry Corp De Projector or the like
US2295863A (en) * 1941-07-25 1942-09-15 Paradis Charles Illuminating device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1286269A (en) * 1918-02-14 1918-12-03 William Vincent Foley Apparatus for motion-picture projection and other purposes.
US1681153A (en) * 1923-12-13 1928-08-14 Westinghouse Electric & Mfg Co Flood light
US1634399A (en) * 1924-10-27 1927-07-05 Charles W Dake Electric-light housing
US1905811A (en) * 1929-11-12 1933-04-25 Wired Radio Inc Cooling system for vacuum tubes
US1895887A (en) * 1929-12-20 1933-01-31 Westinghouse Lamp Co Incandescent electric lamp
FR750412A (en) * 1932-05-07 1933-08-10 G Leroy Et P Pougin Sa Des Ets Lighting fixtures improvements
US2288345A (en) * 1940-05-31 1942-06-30 Vry Corp De Projector or the like
US2295863A (en) * 1941-07-25 1942-09-15 Paradis Charles Illuminating device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913573A (en) * 1957-05-08 1959-11-17 Gen Electric Light projector
US2933596A (en) * 1958-02-27 1960-04-19 Gen Electric Luminaires provided with cooling systems
US3309565A (en) * 1959-12-14 1967-03-14 Mc Graw Edison Co Light output of fluorescent lamps automatically held constant by means of peltier type coolers
US3476925A (en) * 1967-07-27 1969-11-04 Hubbell Inc Harvey Floodlight reflector assembly
US3541324A (en) * 1967-12-18 1970-11-17 Berkey Photo Inc Ventilated light unit with roller curtain shutter
US4974132A (en) * 1990-01-22 1990-11-27 Daniel Naum Light trap for arc lamp ventilating system
US6070657A (en) * 1994-03-24 2000-06-06 Hoval Interliz Ag Heat exchanger tube for heating boilers
US20030081186A1 (en) * 2001-10-31 2003-05-01 Hooper Kevin C. Image projector for use with luminaires
US6793349B2 (en) 2001-10-31 2004-09-21 Rosco Laboratories, Inc. Image projector for use with luminaires
US20070041196A1 (en) * 2005-08-16 2007-02-22 Sony Corporation Heat radiating structure for use in image projecting apparatus
US7625106B2 (en) * 2005-08-16 2009-12-01 Sony Corporation Heat radiating structure for use in image projecting apparatus

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