US20060034086A1 - Illumination system using filament lamps - Google Patents
Illumination system using filament lamps Download PDFInfo
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- US20060034086A1 US20060034086A1 US11/208,142 US20814205A US2006034086A1 US 20060034086 A1 US20060034086 A1 US 20060034086A1 US 20814205 A US20814205 A US 20814205A US 2006034086 A1 US2006034086 A1 US 2006034086A1
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- reflector
- radiation
- focal point
- rays
- filament
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3152—Modulator illumination systems for shaping the light beam
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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
- F21V7/00—Reflectors for light sources
- F21V7/0025—Combination of two or more reflectors for a single light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/0006—Coupling light into the fibre
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
Definitions
- the invention relates to illumination systems using filament lamps.
- On-axis reflector systems such as e.g. elliptical and parabolic reflector systems, are often used in e.g. fiber optic illuminators, projection engines for large screen displays, and projection monitors.
- Such on-axis reflector systems may be used to couple electro-magnetic radiation from a source into small targets.
- On-axis reflector systems may magnify electro-magnetic radiation emitted by the source in different amounts at different angles. The differences in magnification are exacerbated by the size of the light source.
- An ideal source for such an on-axis system is thus a point source.
- Arc lamps are often used as sources of electro-magnetic radiation in such systems rather than, e.g. filament lamps, because they are small enough to approximate a point source.
- Arc lamps are smaller than, e.g. filament lamps, because a, e.g. tungsten filament inside the filament lamp is generally longer than an arc of a comparable short arc lamp. If filament lamps were used in an on-axis reflector system, the image of the filament would be magnified differently for different angles of emitted radiation, resulting in a large fuzzy spot. Filament lamps are thus very inefficient for coupling light into small targets. Filament lamps, however, are generally less expensive, and last longer, than arc lamps. Filament lamps are thus generally used in on-axis reflector systems only if efficiency is not an issue. In applications where efficiency is not an issue a filament lamp such as, e.g. a large wattage lamp may be used.
- the invention consists of an illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge substantially at the second focal point, wherein a portion of the electromagnetic radiation emitted by the filament lamp impinges directly on the reflector and a portion of the electromagnetic radiation does not impinge directly on the reflector and wherein the system further comprises an additional reflector constructed and arranged to reflect at least part of the portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector.
- the invention consists of a method of illumination including steps of positioning a filament lamp at a first focal point of a reflector, producing rays of radiation by the filament lamp, reflecting a portion of the rays of radiation by the reflector toward a second focal point of the second reflector, converging the rays of radiation at the second focal point of the reflector, reflecting at least part of a portion of the rays of radiation that do not impinge directly on the reflector toward the reflector through the first focal point of the reflector, positioning a output light pipe having an input surface and an output surface so the input surface is substantially proximate to the second focal point, collecting the rays of radiation at the input surface, passing the rays of radiation through the output light pipe, and outputting rays of radiation from the output surface of the output light pipe.
- FIG. 1 is a schematic diagram of an illumination system according to one embodiment of the invention.
- FIG. 2 is a schematic diagram of an illumination system according to an alternative embodiment of the invention.
- FIG. 3 is a schematic diagram of an illumination system according to a third embodiment of the invention.
- FIG. 4 is a schematic diagram of an illumination system according to a fourth embodiment of the invention.
- FIG. 5 is a schematic diagram of an illumination system according to a fifth embodiment of the invention.
- FIG. 6 is a schematic diagram of an illumination system according to a sixth embodiment of the invention.
- FIG. 7 is a schematic diagram of an illumination system according to a seventh embodiment of the invention.
- FIG. 8 is a schematic diagram of an illumination system according to an eighth embodiment of the invention.
- FIG. 9 is a schematic diagram of an illumination system according to a ninth embodiment of the invention.
- a filament lamp 102 may be disposed proximate to a first focal point 106 of a reflector 104 having a first and second focal points 106 , 108 .
- Filament lamp 102 may be, e.g. a tungsten filament lamp.
- Filament lamp 102 emits rays of electromagnetic radiation 110 . Some of rays of electromagnetic radiation 110 are reflected by reflector 104 and converge substantially at second focal point 108 .
- Illumination system 100 further includes an additional reflector 114 constructed and arranged to reflect at least part of the portion of electromagnetic radiation 112 that does not impinge directly on reflector 104 toward reflector 104 through first focal point 106 . Since a filament of filament lamp 102 already occupies first focal point 106 , however, the filament of filament lamp 102 substantially blocks electromagnetic radiation 112 . The filament of filament lamp 102 will thus absorb some of electromagnetic radiation 112 . The portion of electromagnetic radiation 112 that is absorbed by the filament of filament lamp 102 may heat the filament of filament lamp 102 , raising its temperature. A higher temperature results in an increased light output, which may be on the order of 30%.
- Additional reflector 114 may be, e.g. a spherical retro-reflector disposed on a side of filament lamp 102 opposite reflector 104 to reflect electromagnetic radiation 112 emitted from filament lamp 102 toward reflector 104 through first focal point 106 .
- additional reflector 114 may be a combination of a parabolic reflector 154 and a planar mirror 156 .
- a full circular parabolic reflector could be used.
- reflector 104 has a coating 116 that reflects substantially only a pre-specified portion 118 of a spectrum of electromagnetic radiation 110 .
- Pre-specified portion 118 may be, e.g. visible light radiation, ultraviolet (UV) radiation, infrared (IR) radiation, a pre-specified band of wavelengths of radiation, or a specific color of radiation.
- illumination system 100 includes a filter 148 placed substantially in a path of rays of electromagnetic radiation 110 .
- Filter 148 has a coating 150 that reflects substantially only a pre-specified portion 152 of a spectrum of electromagnetic radiation 110 .
- coating 150 transmits substantially only a pre-specified portion 152 of a spectrum of electromagnetic radiation 110 .
- pre-specified portion 152 may be, e.g. visible light radiation, ultraviolet radiation, infrared radiation, a pre-specified band of wavelengths of radiation, or a specific color of radiation.
- filter 148 reflects ultraviolet radiation and infrared radiation back to first focal point 106 , while transmitting visible radiation toward second focal point 108 . This would be the case if, e.g. visible light was to be launched into an output device, but not ultraviolet radiation or infrared radiation.
- the infrared and ultraviolet radiation reflected by filter 148 can thus be refocused onto the filament of filament lamp 102 , heating the filament further to produce more light.
- more of the infrared and ultraviolet radiation would be trapped inside the reflector 104 and used for heating the filament of the filament lamp 102 , thus increasing the efficiency of the system 100 .
- the ultraviolet radiation and infrared radiation which would otherwise be wasted would thus be re-used.
- one half of filter 148 could be a reflector and the other half a filter coated with a coating such as, e.g. coating 150 .
- illumination system 100 includes an output light pipe 120 having an input surface 122 and an output surface 124 .
- Input surface 122 may be located proximate to second focal point 108 to collect substantially all of radiation 110 .
- Radiation 110 passes through output light pipe 120 and may be transmitted substantially by output surface 124 .
- Output light pipe 120 may be composed of, e.g. a material such as quartz, glass, plastic, or acrylic.
- Output light pipe 120 may be, e.g. a homogenizer, a tapered light pipe, or a straight light pipe.
- Output light pipe 120 may have, e.g. a cross-section such as a rectangle, a circle, a triangle, a trapezoid, a rhombus, a pentagon, a hexagon, or an octagon.
- illumination system 100 may include further a fiber optic 126 , which may be illuminated substantially by radiation 110 transmitted at output surface 124 of output light pipe 120 , after which fiber optic 126 releases collected radiation 110 to provide for illumination at a desired location 128 .
- illumination system 100 may include further a condenser lens 130 disposed substantially proximate to output surface 124 of output light pipe 120 .
- An image projection system 132 disposed substantially proximate to an output side 134 of condenser lens 130 releases radiation 110 collected and condensed by condenser lens 130 to display an image 136 .
- illumination system 100 includes a waveguide 146 disposed substantially proximate to output surface 124 .
- Waveguide 146 may be, e.g a single core optic fiber, a fiber bundle, a fused fiber bundle, a polygonal rod, or a hollow reflective light pipe.
- Waveguide 146 may further be, e.g. a circular waveguide, a polygonal waveguide, a tapered waveguide, or a combination thereof.
- Waveguide 146 may be composed of, e.g. a material such as quartz, glass, plastic, or acrylic.
- reflector 104 of illumination system 100 comprises a first reflector 138 having a first optical axis 140 and a second reflector 142 having a second optical axis 144 .
- Second reflector 142 may be placed substantially symmetrically to first reflector 138 such that first and second optical axes 140 , 144 are substantially collinear.
- first focal point 106 may be a focal point of first reflector 138 and second focal point 108 may be a focal point of second reflector 142 .
- first and second reflectors 138 , 142 may each be, e.g. at least a portion of a substantially toric surface of revolution. In another embodiment, first and second reflectors 138 , 142 may each be, e.g. at least a portion of a substantially spheroid surface of revolution.
- first reflector 138 shown in FIG. 7 comprises at least a portion of a substantially ellipsoid surface of revolution, while second reflector 142 comprises at least a portion of a substantially hyperboloid surface of revolution.
- first reflector 138 comprises at least a portion of a substantially hyperboloid surface of revolution, while second reflector 142 comprises at least a portion of a substantially ellipsoid surface of revolution.
- first and second reflectors 138 e , 142 e may each be, e.g. at least a portion of a substantially ellipsoid surface of revolution.
- FIG. 8 shows an embodiment of illumination system 100 e using two semi-circular elliptical mirrors 138 e and 142 e with substantially co-linear optical axes 140 e , 144 e.
- the filament of filament lamp 102 may be placed at the focus 106 e of elliptical reflector 138 e .
- a spherical reflector 114 e provides retro-reflection.
- a spherical filter 148 e may be placed such that a center of curvature 158 of filter 148 e coincides with a common focal point 160 of the two elliptical reflectors 138 e , 142 e . Infrared and ultraviolet radiation incident onto the filter 148 e will be reflected back into itself along the same path back into the filament of filament lamp 102 .
- elliptical reflectors 138 e , 142 e have substantially the same shape. In other embodiments, elliptical reflectors 138 e , 142 e might, e.g. have a different ellipticity such that the projected image may be close to 1:1.
- input surface 122 of output light pipe 120 may be placed at second focus 108 e of second elliptical reflector 142 e for collecting and transforming a numerical aperture (NA) of electromagnetic radiation 110 into, e.g. a lower NA.
- NA numerical aperture
- first and second reflectors 138 p , 142 p may each be, e.g. at least a portion of a substantially paraboloid surface of revolution. Rays of radiation 110 collected by parabolic reflector 138 p may be collimated into parabolic reflector 142 p .
- the parabolic reflector 142 p may be placed substantially symmetrically opposite parabolic reflector 138 p , thus producing an image of the filament of filament lamp 102 at first focal point 106 of parabolic reflector 138 p with a substantially unit magnification for all angles of light and preserving the brightness of the filament.
- a method of illumination comprises the steps of positioning a filament lamp 102 at a first focal point 106 of a reflector 104 , producing rays of radiation 110 by filament lamp 102 , reflecting a portion of rays of radiation 110 by reflector 104 toward a second focal point 108 of reflector 104 , converging rays of radiation 110 at second focal point 108 of second reflector 104 , reflecting at least part of a portion of rays of radiation 110 that do not impinge directly on reflector 104 toward reflector 104 through first focal point 106 of reflector 104 , positioning an output light pipe 120 having an input surface 122 and output surface 124 so input surface 122 may be substantially proximate to second focal point 108 , collecting rays of radiation at input surface 122 , passing rays of radiation 110 through output light pipe 120 , and outputting rays of radiation 110 from output surface 124 of output light pipe 120 .
Abstract
An illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge substantially at the second focal point, wherein a portion of the electromagnetic radiation emitted by the filament lamp impinges directly on the reflector and a portion of the electromagnetic radiation does not impinge directly on the reflector and wherein the system further includes an additional reflector constructed and arranged to reflect at least part of the portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector.
Description
- CROSS-REFERENCE TO RELATED APPLICATIONS
- This application claims priority to Provisional Application Ser. No. 60/269,888, filed Feb. 21, 2001, the disclosure of which is incorporated by reference.
- 1. Field of the Invention
- The invention relates to illumination systems using filament lamps.
- 2. Description of the Related Art
- On-axis reflector systems, such as e.g. elliptical and parabolic reflector systems, are often used in e.g. fiber optic illuminators, projection engines for large screen displays, and projection monitors. Such on-axis reflector systems may be used to couple electro-magnetic radiation from a source into small targets. On-axis reflector systems, however, may magnify electro-magnetic radiation emitted by the source in different amounts at different angles. The differences in magnification are exacerbated by the size of the light source. An ideal source for such an on-axis system is thus a point source.
- Arc lamps are often used as sources of electro-magnetic radiation in such systems rather than, e.g. filament lamps, because they are small enough to approximate a point source. Arc lamps are smaller than, e.g. filament lamps, because a, e.g. tungsten filament inside the filament lamp is generally longer than an arc of a comparable short arc lamp. If filament lamps were used in an on-axis reflector system, the image of the filament would be magnified differently for different angles of emitted radiation, resulting in a large fuzzy spot. Filament lamps are thus very inefficient for coupling light into small targets. Filament lamps, however, are generally less expensive, and last longer, than arc lamps. Filament lamps are thus generally used in on-axis reflector systems only if efficiency is not an issue. In applications where efficiency is not an issue a filament lamp such as, e.g. a large wattage lamp may be used.
- There thus exists a need for a coupling system that can couple electro-magnetic radiation from a filament lamp at high efficiency into a small target.
- In one aspect, the invention consists of an illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge substantially at the second focal point, wherein a portion of the electromagnetic radiation emitted by the filament lamp impinges directly on the reflector and a portion of the electromagnetic radiation does not impinge directly on the reflector and wherein the system further comprises an additional reflector constructed and arranged to reflect at least part of the portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector.
- In another aspect, the invention consists of a method of illumination including steps of positioning a filament lamp at a first focal point of a reflector, producing rays of radiation by the filament lamp, reflecting a portion of the rays of radiation by the reflector toward a second focal point of the second reflector, converging the rays of radiation at the second focal point of the reflector, reflecting at least part of a portion of the rays of radiation that do not impinge directly on the reflector toward the reflector through the first focal point of the reflector, positioning a output light pipe having an input surface and an output surface so the input surface is substantially proximate to the second focal point, collecting the rays of radiation at the input surface, passing the rays of radiation through the output light pipe, and outputting rays of radiation from the output surface of the output light pipe.
-
FIG. 1 is a schematic diagram of an illumination system according to one embodiment of the invention; -
FIG. 2 is a schematic diagram of an illumination system according to an alternative embodiment of the invention; -
FIG. 3 is a schematic diagram of an illumination system according to a third embodiment of the invention; -
FIG. 4 is a schematic diagram of an illumination system according to a fourth embodiment of the invention; -
FIG. 5 is a schematic diagram of an illumination system according to a fifth embodiment of the invention; -
FIG. 6 is a schematic diagram of an illumination system according to a sixth embodiment of the invention; -
FIG. 7 is a schematic diagram of an illumination system according to a seventh embodiment of the invention; -
FIG. 8 is a schematic diagram of an illumination system according to an eighth embodiment of the invention; and -
FIG. 9 is a schematic diagram of an illumination system according to a ninth embodiment of the invention. - In a first embodiment of the
illumination system 100 using filament lamps, shown inFIG. 1 , afilament lamp 102 may be disposed proximate to a firstfocal point 106 of areflector 104 having a first and secondfocal points Filament lamp 102 may be, e.g. a tungsten filament lamp.Filament lamp 102 emits rays ofelectromagnetic radiation 110. Some of rays ofelectromagnetic radiation 110 are reflected byreflector 104 and converge substantially at secondfocal point 108. - Although some of rays of
electromagnetic radiation 110 emitted by filament lamp impinge directly onreflector 104, a portion ofelectromagnetic radiation 112 does not impinge directly onreflector 104.Illumination system 100 further includes anadditional reflector 114 constructed and arranged to reflect at least part of the portion ofelectromagnetic radiation 112 that does not impinge directly onreflector 104 towardreflector 104 through firstfocal point 106. Since a filament offilament lamp 102 already occupies firstfocal point 106, however, the filament offilament lamp 102 substantially blockselectromagnetic radiation 112. The filament offilament lamp 102 will thus absorb some ofelectromagnetic radiation 112. The portion ofelectromagnetic radiation 112 that is absorbed by the filament offilament lamp 102 may heat the filament offilament lamp 102, raising its temperature. A higher temperature results in an increased light output, which may be on the order of 30%. -
Additional reflector 114 may be, e.g. a spherical retro-reflector disposed on a side offilament lamp 102opposite reflector 104 to reflectelectromagnetic radiation 112 emitted fromfilament lamp 102 towardreflector 104 through firstfocal point 106. In an alternative embodiment, shown inFIG. 2 ,additional reflector 114 may be a combination of aparabolic reflector 154 and aplanar mirror 156. In a further alternative embodiment, a full circular parabolic reflector could be used. - In one embodiment,
reflector 104 has a coating 116 that reflects substantially only a pre-specified portion 118 of a spectrum ofelectromagnetic radiation 110. Pre-specified portion 118 may be, e.g. visible light radiation, ultraviolet (UV) radiation, infrared (IR) radiation, a pre-specified band of wavelengths of radiation, or a specific color of radiation. - In a third embodiment, shown in
FIG. 3 ,illumination system 100 includes afilter 148 placed substantially in a path of rays ofelectromagnetic radiation 110.Filter 148 has acoating 150 that reflects substantially only apre-specified portion 152 of a spectrum ofelectromagnetic radiation 110. In an alternative embodiment,coating 150 transmits substantially only apre-specified portion 152 of a spectrum ofelectromagnetic radiation 110. In either embodiment, pre-specifiedportion 152 may be, e.g. visible light radiation, ultraviolet radiation, infrared radiation, a pre-specified band of wavelengths of radiation, or a specific color of radiation. - In a preferred embodiment,
filter 148 reflects ultraviolet radiation and infrared radiation back to firstfocal point 106, while transmitting visible radiation toward secondfocal point 108. This would be the case if, e.g. visible light was to be launched into an output device, but not ultraviolet radiation or infrared radiation. The infrared and ultraviolet radiation reflected byfilter 148 can thus be refocused onto the filament offilament lamp 102, heating the filament further to produce more light. As a result, more of the infrared and ultraviolet radiation would be trapped inside thereflector 104 and used for heating the filament of thefilament lamp 102, thus increasing the efficiency of thesystem 100. The ultraviolet radiation and infrared radiation which would otherwise be wasted would thus be re-used. In a further alternative embodiment, one half offilter 148 could be a reflector and the other half a filter coated with a coating such as,e.g. coating 150. - In a preferred embodiment,
illumination system 100 includes anoutput light pipe 120 having aninput surface 122 and anoutput surface 124.Input surface 122 may be located proximate to secondfocal point 108 to collect substantially all ofradiation 110.Radiation 110 passes throughoutput light pipe 120 and may be transmitted substantially byoutput surface 124.Output light pipe 120 may be composed of, e.g. a material such as quartz, glass, plastic, or acrylic.Output light pipe 120 may be, e.g. a homogenizer, a tapered light pipe, or a straight light pipe.Output light pipe 120 may have, e.g. a cross-section such as a rectangle, a circle, a triangle, a trapezoid, a rhombus, a pentagon, a hexagon, or an octagon. - In a fourth embodiment, shown in
FIG. 4 ,illumination system 100 may include further afiber optic 126, which may be illuminated substantially byradiation 110 transmitted atoutput surface 124 of outputlight pipe 120, after whichfiber optic 126 releases collectedradiation 110 to provide for illumination at a desiredlocation 128. - In a fifth embodiment, shown in
FIG. 5 ,illumination system 100 may include further acondenser lens 130 disposed substantially proximate tooutput surface 124 of outputlight pipe 120. Animage projection system 132 disposed substantially proximate to anoutput side 134 ofcondenser lens 130 releasesradiation 110 collected and condensed bycondenser lens 130 to display animage 136. - In an sixth embodiment, shown in
FIG. 6 ,illumination system 100 includes awaveguide 146 disposed substantially proximate tooutput surface 124.Waveguide 146 may be, e.g a single core optic fiber, a fiber bundle, a fused fiber bundle, a polygonal rod, or a hollow reflective light pipe.Waveguide 146 may further be, e.g. a circular waveguide, a polygonal waveguide, a tapered waveguide, or a combination thereof.Waveguide 146 may be composed of, e.g. a material such as quartz, glass, plastic, or acrylic. - In a seventh embodiment, shown in
FIG. 7 ,reflector 104 ofillumination system 100 comprises afirst reflector 138 having a firstoptical axis 140 and asecond reflector 142 having a secondoptical axis 144.Second reflector 142 may be placed substantially symmetrically tofirst reflector 138 such that first and secondoptical axes focal point 106 may be a focal point offirst reflector 138 and secondfocal point 108 may be a focal point ofsecond reflector 142. - In one embodiment, first and
second reflectors second reflectors - In an alternative embodiment,
first reflector 138 shown inFIG. 7 comprises at least a portion of a substantially ellipsoid surface of revolution, whilesecond reflector 142 comprises at least a portion of a substantially hyperboloid surface of revolution. In a further alternative embodiment,first reflector 138 comprises at least a portion of a substantially hyperboloid surface of revolution, whilesecond reflector 142 comprises at least a portion of a substantially ellipsoid surface of revolution. The advantages of these variations would be shown in certain systems where other factors might require that the shapes are different, or the lamp envelope needs to be compensated, or the target may be larger such that 1:1 imaging is not necessary. - In a eighth embodiment, shown in
FIG. 8 , first andsecond reflectors FIG. 8 shows an embodiment ofillumination system 100 e using two semi-circularelliptical mirrors optical axes - The filament of
filament lamp 102 may be placed at thefocus 106 e ofelliptical reflector 138 e. Aspherical reflector 114 e provides retro-reflection. Aspherical filter 148 e may be placed such that a center ofcurvature 158 offilter 148 e coincides with a commonfocal point 160 of the twoelliptical reflectors filter 148 e will be reflected back into itself along the same path back into the filament offilament lamp 102. - In one embodiment,
elliptical reflectors elliptical reflectors - In a further embodiment,
input surface 122 of outputlight pipe 120 may be placed atsecond focus 108 e of secondelliptical reflector 142 e for collecting and transforming a numerical aperture (NA) ofelectromagnetic radiation 110 into, e.g. a lower NA. - In an ninth embodiment, shown in
FIG. 9 , first andsecond reflectors radiation 110 collected byparabolic reflector 138 p may be collimated intoparabolic reflector 142 p. Theparabolic reflector 142 p may be placed substantially symmetrically oppositeparabolic reflector 138 p, thus producing an image of the filament offilament lamp 102 at firstfocal point 106 ofparabolic reflector 138 p with a substantially unit magnification for all angles of light and preserving the brightness of the filament. - In a tenth embodiment, a method of illumination comprises the steps of positioning a
filament lamp 102 at a firstfocal point 106 of areflector 104, producing rays ofradiation 110 byfilament lamp 102, reflecting a portion of rays ofradiation 110 byreflector 104 toward a secondfocal point 108 ofreflector 104, converging rays ofradiation 110 at secondfocal point 108 ofsecond reflector 104, reflecting at least part of a portion of rays ofradiation 110 that do not impinge directly onreflector 104 towardreflector 104 through firstfocal point 106 ofreflector 104, positioning anoutput light pipe 120 having aninput surface 122 andoutput surface 124 soinput surface 122 may be substantially proximate to secondfocal point 108, collecting rays of radiation atinput surface 122, passing rays ofradiation 110 through outputlight pipe 120, and outputting rays ofradiation 110 fromoutput surface 124 of outputlight pipe 120. - While the invention has been described in detail above, the invention is not intended to be limited to the specific embodiments as described. It is evident that those skilled in the art may now make numerous uses and modifications of and departures from the specific embodiments described herein without departing from the inventive concepts.
Claims (3)
1. An illumination system using filament lamps comprising
a filament lamp;
a reflector having a first and second focal point;
said filament lamp disposed proximate to said first focal point of said reflector to emit rays of electromagnetic radiation that reflect from said first reflector and converge substantially at said second focal point;
wherein a portion of the electromagnetic radiation emitted by said filament lamp impinges directly on said reflector and a portion of the electromagnetic radiation does not impinge directly on said reflector and wherein said system further comprises an additional reflector constructed and arranged to reflect at least part of the portion of the electromagnetic radiation that does not impinge directly on said reflector toward said reflector through the first focal point of said reflector.
2-27. (canceled)
28. A method of illumination comprising the steps of:
positioning a filament lamp at a first focal point of a reflector;
producing rays of radiation by said filament lamp;
reflecting a portion of said rays of radiation by said reflector toward a second focal point,
converging said rays of radiation at said second focal point;
reflecting at least part of a portion of the rays of radiation that do not impinge directly on said reflector toward said reflector through the first focal point of said reflector;
positioning a output light pipe having an input surface and an output surface so said input surface is substantially proximate to said second focal point;
collecting said rays of radiation at said input surface;
passing said rays of radiation through said output light pipe; and
outputting rays of radiation from said output surface of said output light pipe.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/208,142 US20060034086A1 (en) | 2001-02-21 | 2005-08-19 | Illumination system using filament lamps |
US11/386,328 US7618158B2 (en) | 2001-02-21 | 2006-03-22 | Illumination system using filament lamps |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US26988801P | 2001-02-21 | 2001-02-21 | |
US10/078,256 US6955452B2 (en) | 2001-02-21 | 2002-02-20 | Illumination system using filament lamps |
US11/208,142 US20060034086A1 (en) | 2001-02-21 | 2005-08-19 | Illumination system using filament lamps |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/078,256 Continuation US6955452B2 (en) | 2001-02-21 | 2002-02-20 | Illumination system using filament lamps |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/386,328 Continuation US7618158B2 (en) | 2001-02-21 | 2006-03-22 | Illumination system using filament lamps |
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US20060034086A1 true US20060034086A1 (en) | 2006-02-16 |
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ID=23029057
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US10/078,256 Expired - Fee Related US6955452B2 (en) | 2001-02-21 | 2002-02-20 | Illumination system using filament lamps |
US11/208,142 Abandoned US20060034086A1 (en) | 2001-02-21 | 2005-08-19 | Illumination system using filament lamps |
US11/386,328 Expired - Fee Related US7618158B2 (en) | 2001-02-21 | 2006-03-22 | Illumination system using filament lamps |
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US10/078,256 Expired - Fee Related US6955452B2 (en) | 2001-02-21 | 2002-02-20 | Illumination system using filament lamps |
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US11/386,328 Expired - Fee Related US7618158B2 (en) | 2001-02-21 | 2006-03-22 | Illumination system using filament lamps |
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US (3) | US6955452B2 (en) |
EP (1) | EP1368681A4 (en) |
JP (1) | JP2004526285A (en) |
KR (1) | KR100638227B1 (en) |
CN (1) | CN1219225C (en) |
CA (1) | CA2437059A1 (en) |
MX (1) | MXPA03007497A (en) |
TW (1) | TW568990B (en) |
WO (1) | WO2002075382A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
WO2002075382A1 (en) | 2002-09-26 |
JP2004526285A (en) | 2004-08-26 |
CA2437059A1 (en) | 2002-09-26 |
CN1491366A (en) | 2004-04-21 |
EP1368681A1 (en) | 2003-12-10 |
MXPA03007497A (en) | 2003-12-08 |
US6955452B2 (en) | 2005-10-18 |
US20020141191A1 (en) | 2002-10-03 |
KR100638227B1 (en) | 2006-10-25 |
TW568990B (en) | 2004-01-01 |
KR20030096260A (en) | 2003-12-24 |
US20060227557A1 (en) | 2006-10-12 |
US7618158B2 (en) | 2009-11-17 |
CN1219225C (en) | 2005-09-14 |
EP1368681A4 (en) | 2005-08-03 |
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