Source: http://www.google.com/patents/US7625098?dq=6650327
Timestamp: 2014-03-12 06:41:13
Document Index: 702133504

Matched Legal Cases: ['application No. 10', 'Application No. 2', 'Application No. 05', 'Application No. 05756155', 'Application No. 05740253', 'Application No. 05758377']

Patent US7625098 - Optical integrating chamber lighting using multiple color sources to adjust ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature) using an optical integrating cavity to combine energy of different wavelengths from different sources with white light. The cavity has a diffusely reflective interior surface and an aperture...http://www.google.com/patents/US7625098?utm_source=gb-gplus-sharePatent US7625098 - Optical integrating chamber lighting using multiple color sources to adjust white lightAdvanced Patent SearchPublication numberUS7625098 B2Publication typeGrantApplication numberUS 10/558,481PCT numberPCT/US2005/013779Publication dateDec 1, 2009Filing dateApr 25, 2005Priority dateApr 27, 2004Fee statusPaidAlso published asCA2558957A1, CA2558957C, CA2558958A1, CA2558958C, CA2558961A1, CA2558961C, CA2680501A1, EP1740350A2, EP1740350A4, EP1740882A2, EP1740882A4, EP1740883A2, EP1740883A4, US6995355, US7148470, US7374311, US7497590, US7604375, US7883239, US20050161586, US20060081773, US20060203483, US20060268543, US20060268544, US20080205053, US20090109669, US20100008087, WO2005105381A2, WO2005105381A3, WO2005106408A2, WO2005106408A3, WO2005106963A2, WO2005106963A3Publication number10558481, 558481, PCT/2005/13779, PCT/US/2005/013779, PCT/US/2005/13779, PCT/US/5/013779, PCT/US/5/13779, PCT/US2005/013779, PCT/US2005/13779, PCT/US2005013779, PCT/US200513779, PCT/US5/013779, PCT/US5/13779, PCT/US5013779, PCT/US513779, US 7625098 B2, US 7625098B2, US-B2-7625098, US7625098 B2, US7625098B2InventorsJack C. Rains, Jr., Matthew BrownOriginal AssigneeAdvanced Optical Technologies, LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (107), Non-Patent Citations (20), Referenced by (9), Classifications (73), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetOptical integrating chamber lighting using multiple color sources to adjust white lightUS 7625098 B2Abstract A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature) using an optical integrating cavity to combine energy of different wavelengths from different sources with white light. The cavity has a diffusely reflective interior surface and an aperture for allowing emission of combined light. Control of the intensity of emission of the sources sets the amount of primary color light of each wavelength added to the substantially white input light output and thus determines a spectral characteristic of the white light output through the aperture. A variety of different elements may optically process the combined light output, such a deflector, a variable iris, a lens, a variable focusing lens system, a collimator, a holographic diffuser and combinations thereof.
a third source of light, wherein the third source produces substantially white light;
an optical cavity having a diffusely reflective interior surface for receiving and combining light of the first and second wavelengths and the substantially white light, from the sources of light, to form white light of a desired spectral characteristic, and having an aperture for allowing emission of the white light of the desired spectral characteristic; and
an optical processing element coupled to the aperture of the optical cavity,
wherein the optical processing element comprises a deflector having a reflective inner surface coupled to the aperture to deflect at least some of the combined light.
2. The apparatus of claim 1, wherein at least a substantial portion of the reflective inner surface of the deflector exhibits a diffuse reflective characteristic with respect to the combined light.
a first portion of the reflective inner surface of the deflector exhibits a diffuse reflective characteristic; and
a second portion of the reflective inner surface of the deflector exhibits a specular reflective characteristic.
4. A lighting apparatus, comprising:
wherein the optical processing element comprises a variable focusing lens system and a variable opening iris located between the cavity and the variable focusing lens system.
5. A lighting apparatus, comprising:
wherein the optical processing element comprises a transmissive diffuser, selected from the group consisting of a diffusing lens, a curved transmissive cover over the aperture of the optical cavity and a holographic diffuser.
6. The apparatus of any of claims 1-3, 4 and 5, further comprising adjustable control circuitry coupled to the first and second sources for establishing intensity of light from each of the sources, so as to adjust the spectral characteristic of white light emitted through the aperture.
7. The apparatus of any of claims 1-3, 4 and 5, wherein:
8. A lighting apparatus, comprising:
an optical cavity having a diffusely reflective interior surface for receiving and combining light of the first and second wavelengths and the substantially white light, from the sources of light, to form white light of a desired spectral characteristic, and having an aperture for allowing emission of the white light of the desired spectral characteristic, wherein:
the second source comprises one or more light emitting diodes for emitting light of a second visible color, wherein the second color is different from the first color;
9. The apparatus of claim 7, wherein the third source comprises one or more white light emitting diodes or one or more incandescent or fluorescent light bulbs.
10. The apparatus of any of claims 1-3, 4 and 5, further comprising a fourth source for supplying light of a third wavelength into the optical cavity for combination with the light of the first and second wavelengths and with the substantially white light, the third wavelength being different from the first wavelength and from the second wavelength.
12. The apparatus of claim 11, wherein the first, second and third colors are red, green and blue, respectively.
13. A lighting system, for providing variable white lighting for studio or theater applications, the lighting system comprising:
a third source of light, for supplying a substantially white light;
an optical cavity having a diffusely reflective interior surface for receiving and combining light of the first and second wavelengths and the substantially white light from the sources, to form white light of a desired spectral characteristic, and having an aperture for allowing emission of the white light of the desired spectral characteristic;
a variable opening iris optically coupled to the aperture of the optical cavity, for controlling an amount of the light of the desired spectral characteristic emitted toward a subject to be illuminated; and
control circuitry coupled to at least the first and second sources for establishing intensity of light from the first and second sources, so as to set the desired spectral characteristic of the light directed toward the subject to be illuminated in the studio or theater.
14. The lighting system of claim 13, further comprising a variable focusing lens system, for adjustably focusing the light emitted through the iris toward the subject to be illuminated.
15. The lighting system of claim 13 or claim 14, wherein:
16. The lighting system of claim 15, wherein the control circuitry comprises:
logic circuitry responsive to color detected by the sensor to control output intensity of the one or more first color light emitting diodes and intensity of the one or more second color light emitting diodes.
17. The lighting system of claim 15, wherein:
the one ore more second color light emitting diodes comprises an initially active light emitting diode for emitting light of the second color and an initially inactive diode for emitting light of the second color on an as needed basis.
18. The lighting system of claim 17, wherein the control circuitry comprises:
logic circuitry responsive to color detected by the sensor to control output intensity of the one or more first color light emitting diodes and intensity of the one or more second color light emitting diodes, and
wherein the logic circuitry is responsive to the detected color to selectively activate the inactive light emitting diodes, as needed to maintain a desired color distribution in the emitted light.
19. The lighting system of claim 18, wherein the third source comprises one or more light emitting diodes for supplying substantially white light into the optical cavity for combination with the light of the first and second wavelengths.
20. The lighting system of claim 13, wherein the third source comprises one or more incandescent or fluorescent light bulbs.
21. A lighting network comprising:
a plurality of lighting systems, each as specified in claim 13; and
a master controller communicatively networked to the control circuitry of each of the lighting systems, for providing a common control of all light emissions by the lighting systems.
TECHNICAL FIELD This application is the U.S. National Phase under 35 U.S.C. � 371 of International application No. PCT/US2005/013779, filed Apr. 25, 2005, which in turn claims the benefit of U.S. application Ser. No. 10/832,464, filed Apr. 27, 2004, now U.S. Pat. No. 6,995,355 issued Feb. 7, 2006. This application also is a Continuation-In-Part and claims the benefit of the filing date of U.S. patent application No. 10/832,464 filed on Apr. 27, 2004, now U.S. Pat. No. 6,995,355, the disclosures of which is incorporated by reference herein.
The control may be somewhat static, e.g. set the desired color reference index or �desired� color temperature and the overall intensity and leave the device set-up in that manner for an indefinite period. The apparatus also may be controlled dynamically, for example, to vary the color of the white light output and thereby provide special effects lighting. Also, such light settings are easily recorded and reused at a later time or even at a different location using a different system.
The inventive devices have numerous applications, and the output intensity and spectral characteristic may be tailored and/or adjusted to suit the particular application. For example, the intensity of the integrated light emitted through the aperture may be at a level for use in a rumination application or at a level sufficient for a task lighting application. Theater or studio lighting and product display lighting examples are also disclosed.
The source LEDs 19 can include LEDs of any color or wavelength. Typically, an array of LEDs for a visible light application includes at least red, green, and blue LEDs. The integrating or mixing capability of the cavity 11 serves to project light of any color, including white light, by adjusting the intensity of the various sources coupled to the cavity. Hence, it is possible to control color rendering index (CRI), as well as color temperature. The system 10 works with the totality of light output from a family of. LEDs 19 to adjust the spectral characteristic of the white light output. However, to provide color adjustment or variability for the white light output, it is not necessary to control the output of individual LEDs 19 or source 20, except as they contribute to the totality. For example, it is not necessary to modulate the source outputs. Also, the distribution pattern of the individual LEDs and their emission points into the cavity are not significant. The LEDs 19 can be arranged in any manner to supply radiant energy within the cavity, although it is preferred that direct view of the LEDs from outside the fixture is minimized or avoided.
In this example, light outputs of the LED sources 19 are coupled directly to openings at points on the interior of the cavity 11, to emit radiant energy directly into the interior of the optical integrating cavity. The LEDs may be located to emit light at points on the interior wall of the element 13, although preferably such points would still be in regions out of the direct line of sight through the aperture 17. For ease of construction, however, the openings for the LEDs 19 are formed through the cover, plate 15. On the plate 15, the openings/LEDs may be at any convenient locations.
The optical integrating cavity 31 has a diffusely reflective interior surface. In this example, the cavity 31 has a shape corresponding to a substantial portion of a cylinder. In the cross-sectional view of FIG. 2 (taken across the longitudinal axis of the cavity), the cavity 31 appears to have an almost circular shape. In this example, the cavity 31 is formed by a cylindrical element 33. At least the interior surface of the element 33 is highly diffusely, reflective, so that the resulting optical cavity 31 is highly diffusely reflective and functions as an integrating cavity, with respect to the radiant energy spectrum produced by the system 30.
Thus, the LEDs 37 and 39 supply radiant energy into the interior of the optical integrating cavity 31, through openings at points on the interior surface of the optical integrating cavity not directly visible through the aperture 35. A number of the LEDs emit radiant energy of different wavelengths, and at least one of the LEDs,emits substantially white light. For example, arbitrary pairs of the LEDs 37, 39 might emit three different colors of light, e.g. Red, Green and Blue as primary colors. One or more white light sources, e.g. white LEDs, also are provided to supply the substantially white input light.
With respect to the light energy of the wavelengths processed by the system, the interior space formed between the cavity 75 and the facing surface of the mask 81 operates as an optical integrating cavity, in essentially the same manner, as the integrating cavities in the previous embodiments. Again, the LEDs 87 provide light of a number of different colors, and thus of different wavelengths. At least one of the LEDs also provides substantially white light: The optical cavity combines the light of multiple colors supplied from the LEDs 87. The control circuit 21 controls the amount of each color of light supplied to the chamber and thus the proportion thereof included in the combined output light. The constructive occlusion serves to distribute that light in a desired manner over a field or area that the system 70 is intended to illuminate, with a tailored intensity distribution.
The system 90 includes a control circuit 21 and associated power source.23, for supplying controlled electrical power to the LED sources 95. In this example, the LEDs emit light through openings through the base 91, preferably at points not directly visible from outside the system. The LEDs 95 supply substantially white light as well as various wavelengths of primary color light, and the circuit 21 controls the power of each LED, to control the amount of each color of light in the combined output, as discussed above relative to the other examples.
The inventive devices have numerous applications, and the output intensity and spectral characteristic may be tailored and/or adjusted to suit the particular application. For example, the intensity of the integrated white light emitted through the aperture may be at a level for use in a rumination application or at a level sufficient for a task lighting application. A number of other control circuit features also may be implemented. For example, the control may maintain a set color characteristic in response to feedback from a color sensor. The control circuitry may also include a temperature sensor. In such an example, the logic circuitry is also responsive to the sensed temperature, e.g. to reduce intensity of the source outputs to compensate for temperature increases. The control circuitry may include an appropriate device for manually setting the desired spectral characteristic, for example, one or more variable resistors or one or more dip switches, to allow a user to define or select the desired color distribution.
The electrical components shown in FIG. 10 also include an LED control system 120. The system 120 includes driver circuits for the various LEDs and a microcontroller. The driver circuits supply electrical current to the respective LEDs 113 to 119 to cause the LEDs to emit light. The driver circuit 121 drives the Red LEDs 113, the driver circuit 123 drives the green LEDs 115, and the driver circuit 125 drives the Blue LEDs 117. In a similar fashion, when active, the driver circuit 1.27 provides electrical current to the other LEDs 119. If the other LEDs provide another color of light, and are connected in series, there may be a single driver circuit 127. If the LEDs are sleepers, it may be desirable to provide a separate driver circuit 127 for each of the LEDs 119. The intensity of the emitted light of a given LED is proportional to the level of current 'supplied by the respective driver circuit.
The color sensor 145, for example, is coupled to detect color distribution in the integrated radiant energy. The color sensor may be coupled to sense energy within the optical integrating cavity, within the deflector (if provided) or at a point in the field illuminated by the particular system. Various examples of appropriate color sensors are known. For example, the color sensor may be a digital compatible sensor, of the type sold by TAOS, Inc; Another suitable sensor might use the quadrant light detector disclosed in U.S. Pat. No. 5,877,490, with appropriate color separation on the various light detector elements (see U.S. Pat. No. 5,914,487 for discussion of the color analysis).
The exemplary systems discussed herein may have any size desirable for any particular application. A system may be relatively large, for lighting a room or providing spot or flood lighting. The system also may be relatively small, for example, to provide a small pinpoint of light, for an indicator or the like. The system 250 a with or even without the lens, is particularly amenable to miniaturization. For example, instead of a plate to support the LEDs, the LEDs could be manufactured on a single chip. If it was not convenient to provide the aperture through the chip, the aperture could be formed through the reflective dome.
FIG. 15 is a cross sectional view of an example of a wall washer type fixture 350. The fixture 350 includes an optical integrating cavity 351 having a diffusely reflective inner surface, as in the earlier examples. In this fixture, the cavity 351 has a substantially rectangular cross-section. As shown, the fixture 350 includes at least one white light source, represented by the white LED 355. The fixture also includes several LEDs 359 of the various primary colors, typically red (R), green (G) and blue (B, not visible in this cross-sectional view). The LEDs 359 include both initially-active LEDs and sleeper LEDs, and the LEDs 359 are similar to those in the earlier examples. Again, the LEDs emit controlled amounts of multiple colors of light into the optical integrating cavity 351 formed by the inner surfaces of a rectangular member 353. A power source and control circuit similar to those used in the earlier examples provide the drive currents-for the LEDs 359, and in this example, that same circuit controls the drive current applied to the white LED 355. In view of the similarity, the power source and control circuit are omitted from FIG. 15, to simplify the illustration.
FIG. 16 is a cross-sectional view of another example of an optical integrating cavity type light fixture 370. This example uses a deflector and lens to optically process the light output, and like the example of FIG. 23 the fixture 370 includes LEDs to produce various colors of light in combination with a white light source. The fixture 370 includes an optical integrating cavity 371, formed by a dome and a cover plate, although other structures may be used to form the cavity. The surfaces of the dome and cover forming the interior surface(s) of the cavity 371 are diffusely reflective. One or more apertures 377, in this example formed through the cover plate, provide a light passage for transmission of reflected and integrated light outward from the cavity 371. Materials, sizes, orientation,.positions and possible shapes for the elements forming the cavity and the types/numbers of LEDs have been discussed above.
Consider now a studio lighting example for an actor or newscaster. The person is tested under lighting using one or more fixtures as described herein, to determine the optimum color to achieve desired appearance in video or film photography of the individual. Again, the light will generally be white to the observer, but each person will appear better at somewhat different temperature or color balance levels. One person might appear more healthy and natural under warmer light, whereas another might appear better under bluer/colder white light. After testing to determine the person's best light color 'settings, the settings are recorded. Each time the person appears under any lighting using the systems disclosed herein, in the same or a different studio; the technicians operating the lights can use the same settings to control the lighting and light the person with light of exactly the same spectral characteristic(s). Similar processes may be used to define a plurality of desirable lighting conditions for the actor or newscaster, for: example, for illumination for different moods or different purposes of the individual's performances.
The methods for defining and transferring set conditions, e.g. for product lighting or personal lighting, can utilize manual recordings of settings and input of the settings to the different lighting systems. However, it is preferred to utilize digital control, in systems such as described above relative to FIGS. 10 and 12. Once input to a given lighting system, a particular set of parameters for a product or individual become another preset lighting recipe stored in digital memory, which can be quickly and easily recalled and used each time that the particular product or person is to be illuminated.
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URL: http//www.efg2.com/Lab/Graphics/Colors/Chromaticity.htm pp. 1-15, Apr. 2005.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7722211 *Aug 2, 2005May 25, 2010Koninklijke Philips Electronics N.V.Light engineUS7901111 *Nov 29, 2007Mar 8, 2011Cree, Inc.Lighting device and lighting methodUS7939793Apr 8, 2009May 10, 2011Abl Ip Holding LlcIntelligent solid state lightingUS7939794May 6, 2010May 10, 2011Abl Ip Holding LlcIntelligent solid state lightingUS7980728 *May 27, 2008Jul 19, 2011Abl Ip Holding LlcSolid state lighting using light transmissive solid in or forming optical integrating volumeUS8282241Jun 13, 2011Oct 9, 2012Abl Ip Holding LlcSolid state lighting using light transmissive solid in or forming optical integrating volumeUS8330394 *Apr 9, 2010Dec 11, 2012Young Lighting Technology Inc.Light source of LED and method for producing light source with varying color while dimmingUS8432584 *Dec 26, 2007Apr 30, 2013Lexmark International, Inc.Scanner and system employing composite illuminationUS20110248645 *Apr 9, 2010Oct 13, 2011Young Lighting Technology CorporationLight source of led and method for producing light source with varying color while dimming* Cited by examinerClassifications U.S. Classification362/231, 362/243, 362/228International ClassificationB25B13/14, G01J3/10, G01J1/00, B25B23/00, H01L31/00, G05D25/02, B25B23/18, F21V14/06, F21V7/22, F21V9/16Cooperative ClassificationF21V11/10, G05D25/02, G09F13/14, H05B35/00, F21V2008/002, H05B33/0842, H05B33/0812, F21V7/22, F21V14/06, F21Y2101/02, G02B5/0278, F21V5/008, Y10S362/812, H05B33/0872, G01J3/501, G01J3/10, F21Y2113/02, F21Y2113/005, G02B5/0252, G09F13/22, Y02B20/343, Y10S362/80, G02B6/0008, G02B5/0284, H05B33/0869, G09F13/06, G01J1/08, F21V5/002, G03B15/06, G01J3/0264, F21S10/02, F21W2131/406, H05B33/0863, F21Y2113/00, G01J3/0254, F21S8/00, F21S2/00, G09F13/0404European ClassificationG02B5/02D6, G02B5/02U2, G02B5/02U4, F21S8/00, F21V5/00S, G09F13/04B, F21S10/02, G09F13/22, H05B33/08D1C2, G09F13/14, H05B33/08D3, H05B33/08D3K6, G03B15/06, H05B33/08D3K2U, G05D25/02, G01J3/10, H05B33/08D3K4F, G09F13/06, H05B35/00, G01J3/02B19, G02B6/00L4E, F21S2/00Legal EventsDateCodeEventDescriptionApr 24, 2013FPAYFee paymentYear of fee payment: 4Aug 13, 2010ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ADVANCED OPTICAL TECHNOLOGIES, L.L.C.;REEL/FRAME:024823/0971Effective date: 20100723Owner name: ABL IP HOLDING LLC, GEORGIAOct 8, 2008ASAssignmentOwner name: RENAISSANCE LIGHTING, INC., VIRGINIAFree format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:NGEN II, LP;REEL/FRAME:021703/0289Effective date: 20081006May 21, 2008ASAssignmentOwner name: NGEN II, LP, CALIFORNIAFree format text: SECURITY INTEREST;ASSIGNOR:RENAISSANCE LIGHTING, INC.;REEL/FRAME:021018/0012Effective date: 20080516Nov 28, 2005ASAssignmentOwner name: ADVANCED OPTICAL TECHNOLOGIES, LLC, VIRGINIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RAINS, JACK C., JR.;BROWN, MATTHEW;REEL/FRAME:017954/0443;SIGNING DATES FROM 20051111 TO 20051118RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google