Distributed illumination system

• US 8,674,616 B2
• Filed: 03/29/2011
• Issued: 03/18/2014
• Est. Priority Date: 10/10/2008
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Holman, Robert L., Sampsell, Matthew B., Sampsell, Jeffrey B.
• Primary Examiner(s): A, Minh D
• Application Number:
  US13/074,927
• Publication Number:
  US 20110175533A1
• Time in Patent Office: 1,085 Days
• Field of Search: 315/307, 315/224, 315/291, 315/294, 315/299, 315/295, 315/308, 315/309, 315/312, 315/322, 362/294, 362/153, 362/404, 362/405, 362/406, 362/407, 362/408, 362/410, 362/411, 362/414
• US Class Current: 315/224
• CPC Class Codes: E04B 9/32 Translucent ceilings, i.e. permitting both the transmission and diffusion of light E04B9/303 and E04B9/34 takes precedence; lighting F21
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 21/002 making direct electrical contact, e.g. by piercing F21V21/35 takes precedence
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 33/006 General building constructions or finishing work for buildings, e.g. roofs, gutters, stairs or floors; Garden equipment; Sunshades or parasols
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources

Abstract

The present invention introduces a new class of lightweight tile-based illumination systems for uses wherein thin directionally-illuminating light distributing engines are embedded into the body of otherwise standard building materials like conventional ceiling tiles along with associated means of electrical control and electrical power interconnection. As a new class of composite light emitting ceiling materials, the present invention enables a lighter weight more flexibly distributed overhead lighting system alternatives for commercial office buildings and residential housing without changing the existing materials. One or more spot lighting, task lighting, flood lighting and wall washing elements having cross-sectional thickness matched to that of the building material or tile into which they are embedded, are contained and interconnected within the material body'"'"'s cross-section. Embedded power control devices interconnected to each lighting element in the distributed system communicate with a central switching center that thereby controls each light-emitting element in the system.

Claims

1. A ceiling lighting system comprising:

a ceiling tile having one or more recesses extending at least partially through ceiling tile, the ceiling tile having an aperture opening;

a light distributing engine including a light emitter, a heat sink, and light distributing optics, the light distributing optics collecting the light from the light emitter and redirecting the light into a directional beam of output illumination, wherein an output aperture of the light distributing engine is aligned with the aperture opening of the ceiling tile so that the directional beam of output illumination is substantially transmitted to the space below the ceiling tile;

an electronic circuit configured to transmit and control electrical currents passing to and from the light distributing engine, the electronic circuit including a voltage regulation circuit, an electric current control circuit, and a control signaling circuit, the electric voltage regulation circuit providing regulated DC voltage levels for the electric current control circuit and the control signaling circuit, the control signaling circuit including a control signal receiver circuit arranged to receive and process control signals broadcast by a master controller outputting control instructions to the electric current control circuit, and the control signaling circuit further including a control signal transmitter circuit arranged to broadcast informational signals at regular time intervals to the master controller corresponding to first electrical signals;

one or more on-tile power transfer elements associated with the electronic circuit,

wherein the light distributing engine, and the electronic circuit are substantially disposed within the ceiling tile, thereby requiring little or no plenum space above the ceiling tile,

and wherein the one or more power transfer elements are at least partially embedded into the one or more recesses of the ceiling tile and in electrical contact with one or more electrical power access terminals on the electronic circuit and on the light distributing engine; and

one or more affixation elements, the one or more affixation elements used to affix the electronic circuit, the one or more on-tile power transfer elements, the one or more electrical power access terminals, and the light distributing engine to each other and/or to the one or more recesses of the ceiling tile.

2. The ceiling lighting system of claim 1, further comprising:

supply-to-tile power delivery elements which enable high efficiency transmission of electrical current flow to and from the one or more power transfer elements embedded in the body of the ceiling tile; and

a master controller including a means of receiving the first electrical signals, a means of processing the first electrical signals, and a means of broadcasting second electrical signals that provide control instructions transmitted to the electronic circuit to set the level of the electrical currents passed to and from the light distributing engine to which the electronic circuit is connected.

3. The ceiling lighting system of claim 2, wherein the supply-to-tile power delivery elements are electrically connected with electrical power input and electrical power output terminals on the light distributing engine embedded in the ceiling tile.

4. The ceiling lighting system of claim 2, wherein the supply-to-tile power delivery elements are electric cables terminating in electric connectors that plug directly into electric sockets for the electric cables embedded in the ceiling tile, the ceiling tile further comprising electric socket recesses set apart from the one or more recesses that the light distributing engine is embedded in.

5. The ceiling lighting system of claim 1, wherein the electric current control circuit broadcasts as part of the informational signals, a unique digital address for the light distributing engine.

6. The ceiling lighting system of claim 5, wherein the master controller prefaces each broadcast of the control signals with a reference state corresponding to the digital address of the light distributing engine such that the control signaling circuit receiving the control signals is able to recognize the digital address of the light distributing engine connected to it, and can thereby process only those parts of the control signals received from the master controller directed to the digital address of the light distributing engine to which it is connected.

7. The ceiling lighting system of claim 1, wherein the control signal transmitter circuit broadcasts at regular time intervals the informational signals including a digital group address for the light distributing engine, the group address representing the assignment of the light distributing engine to a particular grouping of light distributing engines.

8. The ceiling lighting system of claim 1, wherein the control signal transmitter circuit broadcasts at the regular time intervals the information signals including an operating current level for the light distributing engine.

9. The ceiling lighting system of claim 1, wherein the control signal transmitter circuit broadcasts at the regular time intervals the information signals including an operating brightness level for the light distributing engine.

10. The ceiling lighting system of claim 1, wherein the control signal transmitter circuit broadcasts at the regular time intervals the information signals including an operating current level for each separately operating portion of the light distributing engine for producing a directional beam of output illumination having an angular extent.

11. The ceiling lighting system of claim 1, wherein the control signaling circuit broadcasts informational signals at the regular time intervals as a direct response to requests for information included, in the control signals received from the master controller.

12. The ceiling lighting system of claim 1, wherein the electric voltage regulation circuit is connected to the light distributing engine and is embedded in the same recess as the light distributing engine to which it is connected.

13. The ceiling lighting system of claim 1, wherein the electric current control circuit is connected to the light distributing engine and is substantially embedded in the same recess as the light distributing engine to which it is connected, and unembedded portions of the electronic circuit, comprising the electric voltage regulation circuit and the control signaling circuit, are embedded in a spatially different location within the ceiling tile.

14. The ceiling lighting system of claim 1, wherein the electric current control circuit is connected to the light distributing engine and is substantially embedded in the same recess as the light distributing engine to which it is connected, and unembedded portions of the electronic circuit, comprising the electric voltage regulation circuit and the control signaling circuit, are embedded in the recess occupied by the light distributing engine.

15. The ceiling lighting system of claim 1, wherein the electronic circuit is connected to the light distributing engine within the ceiling tile and is embedded in the same recess as the light distributing engine to which it is connected.

16. The ceiling lighting system of claim 1, wherein the electronic circuit is connected to the light distributing engine within the ceiling tile and is embedded in a spatially different location than the light distributing engine.

17. The ceiling lighting system of claim 1, wherein the master controller produces second electrical signals that broadcast the control instructions to the electronic circuit, wherein the electronic circuit thereby receives, processes and acts upon the control instructions by supplying a level of electrical current to the light distributing engine occupying the one or more recesses.

18. The ceiling lighting system of claim 17, wherein the control instructions include:

commands addressed separately to the light distributing engine whose output light level is to be in an “

off state”

corresponding to the level of electrical currents being substantially zero;

further commands addressed separately to the light distributing engine whose output light level is to be in an “

on state”

corresponding to the level of electrical currents being greater than zero; and

commands addressed separately to the light distributing engine whose output light level is to be an intermediary state between the “

off state” and

the “

on state.”

19. The ceiling lighting system of claim 1, wherein the master controller receives the first electrical signals from a signaling device selected from a group of signaling devices including an electrical switch, a keyboard, a keypad, a remote control emitting a light beam, a remote control emitting a radio frequency signal, a motion detector, an electronic message received via network connection, an electronic message received from a microprocessor, and the informational signals as broadcasts by the control signal circuit.

20. The ceiling lighting system of claim 1, wherein the light emitter of the light distributing engine has flat primary light emitting output apertures configured to emit light substantially into a solid angle of 2π

steradians or less, where emitted light is substantially axially symmetric about an average pointing direction that is perpendicular to the plane of the output apertures.

21. The ceiling lighting system of claim 20, wherein the flat primary light emitting output apertures of the light emitter are oriented substantially perpendicular to output apertures of the corresponding the light distributing engine, the light distributing optics within the light distributing engine being separable into a first optical group and a second optical group, such that each optical group causes the average pointing direction of the light to change, the first optical group being configured to substantially collect the light from the light emitter and causing a first change to the pointing direction of substantially ninety degrees within a plane parallel to the plane of the output aperture of the light distributing engine, and the second optical group being configured to substantially collect the light from the first optical group and causing a second change to the pointing direction of greater than zero degrees and less than one hundred eighty degrees in a plane perpendicular to the plane of the output aperture of the light distributing engine, the second change resulting in an ultimate pointing direction of an output light distribution, the output light distribution exiting the output aperture of the light distributing engine.

22. The ceiling lighting system of claim 21, wherein the first optical group allows light to traverse a significant length along the original pointing direction while turning the light either continuously or in several discrete packets, such that the turned light spans a significantly larger extent in the dimension parallel to the original pointing direction of the light than either dimension of the original source, thereby having significantly lower average illuminance than the illuminance of the source.

23. The ceiling lighting system of claim 21, wherein the second optical group is configured such that the light traverses a significant length along the pointing direction the light had upon entering the second optical group, while turning it either continuously or in several discrete packets, such that the turned light spans a significantly larger extent in the dimension parallel to the pointing direction light had upon entering the second optical group than either dimension of the original source, thereby having significantly lower average illuminance than the illuminance of the source.

24. The ceiling lighting system of claim 23, wherein the second optical group comprises:

a light collecting and collimating optic with input aperture sized and positioned such that substantially all light emitted from the output aperture of the first optical group is collected;

a light guiding optic receiving the light from the light collecting and collimating optic, with means of extraction along its length, its length being oriented along the pointing direction of the collected light;

an optical turning structure spanning a length of an extraction region of the light guiding optic, such that substantially all of the extracted light is turned; and

light retaining reflectors to prevent almost all of the light from escaping from any area other than the output aperture of the second optical group.

25. The ceiling lighting system of claim 24, wherein the light collecting and collimating optic is an input end of the light guiding optic.

26. The ceiling lighting system of claim 24, wherein the light guiding optic is a rectangular light guide plate with a facetted side, the facetted side configured to turn the light by total internal refraction, directing the light through a body of the light guide plate and out a side opposing the facetted side, the facetted side thereby serving as both a principle means of extraction and as an optical turning structure.

27. The ceiling lighting system of claim 24, wherein the light guiding optic is a light guide plate that narrows in one dimension along its length, the dimension being substantially parallel to the pointing direction of the output aperture of second optical group, such that the specified output side of the light guide plate disposed toward the output aperture of the light distributing engine and an opposing side converge toward each other along a length of the plate such that the light guide plate terminates in an edge significantly narrower than the input edge, forming a triangular or trapezoidal cross section in one orientation, the narrowing of the light guide plate resulting in a fractional TIR failure along its length which serves as a means of extraction.

28. The ceiling lighting system of claim 27, wherein the light guide plate is bounded by air on both its specified output side and the opposing side, such that light escapes substantially equally out of both surfaces via total internal reflection failure, further comprising a specularly reflective surface disposed to opposing side of the plate, such that the light exiting the opposing side hits the reflector and re-enters the light guide plate, such that substantially all light is ultimately extracted out the specified output side.

29. The ceiling lighting system of claim 27, wherein the optical turning structure is a facetted surface of a light transmitting film that is disposed on the specified output side of the light guide plate, the film having its facetted surface disposed toward the plate and a flat surface displaced away from plate, the facetted surface configured to turn the light by means of first refraction and then total internal reflection.

30. The ceiling lighting system of claim 27, wherein the optical turning structure is a facetted surface of a light transmitting film, the facetted surface coated with reflective material and the facetted surface disposed away from the light guide plate, the film having a flat transparent surface disposed toward the light guide plate, the flat surface optically coupled to the light guide plate via a low index or fraction media, the low index media having low index relative to both an index of the film and an index of the plate, the low index media causing substantially all total internal reflection failure to occur first on the opposing side of the plate, such that substantially all of the light travels through the low index media and into the film, where the light hits the reflective facetted surface of the film and turns, traveling back through the low index media, through the light guide plate, and exits out the specified output side of the light guide plate.

31. The ceiling lighting system of claim 21, wherein the first optical group comprises:

a light collecting and collimating optic with an input aperture sized and positioned such that substantially all light emitted by the light emitter is collected;

a light guiding optic receiving the light from the light collecting and collimating optic, with means of extraction along its length, its length being oriented along the pointing direction of the collected light;

an optical turning structure spanning the length of an extraction region of the light guiding optic, such that substantially all of the extracted light is turned; and

light retaining reflectors positioned to prevent any significant amount of light from escaping from any area other than the output aperture of the first optical group.

32. The ceiling lighting system of claim 31, wherein the light collecting and collimating optic is an etendué

preserving reflector with a light collecting input aperture whose edge dimensions are x₁ by x₁ if square;

whose edge dimensions are x₁ and y₁ if rectangular, and whose diameter is d1 if circular, all closely matching the size and shape of the flat primary light emitting output aperture of the light emitter, and with a light transmitting output aperture closely matching a corresponding light receiving input aperture of the light guiding optic, the light transmitting output aperture'"'"'s edge dimensions are X₁ by X₁ if square, X₁ by Y₁ if rectangular and D₁ if circular, reflective sidewalls between the etendue preserving reflector'"'"'s light collecting input aperture and the light transmitting output aperture, governed by satisfying the Sin Law at every point, which for the square, rectangular and circular apertures involved are x₁˜

X₁ Sin θ

₁, y₁˜

Y₁ Sin θ

₂, and d₁˜

D₁ Sin θ

₁, when the light collecting input aperture receives the light substantially within +/−

90-degrees, and the light transmitting output aperture emits a light beam having a square cone +/−

θ

₁ by +/−

θ

₁ when both the light collecting input aperture and the light transmitting output apertures are square, +/−

θ

₁ by +/−

θ

₂ when one of the light collecting input aperture and the light transmitting output aperture is rectangular, and +/−

θ

₁ when both the light collecting input aperture and light transmitting output aperture are circular.

33. The ceiling lighting system of claim 31, wherein the light collecting and collimating optic is an input end of the light guiding optic.

34. The ceiling lighting system of claim 31, wherein the light guiding optic is a rectangular light pipe with a facetted microstructure on one side, the facetted microstructure configured to turn light by total internal refraction, directing light through a body of the light pipe and out an opposing side of the light pipe, the facetted microstructure thereby serving as both a principle means of extraction and as an optical turning structure.

35. The ceiling lighting system of claim 31, wherein the light guiding optic is a four-sided light pipe formed by a transparent dielectric media that narrows in one dimension along its length, the dimension being substantially parallel to the pointing direction of the light after turning, such that a specified output side of the light pipe disposed toward the second optical group and the opposing side converge toward each other along a length of the pipe such that the light pipe terminates in an edge significantly narrower than the input edge, forming a triangular or trapezoidal cross section in one orientation, the narrowing of the light pipe resulting in a fractional TIR failure along its length which serves as a means of light extraction into a dielectric medium surrounding or immersing the light pipe.

36. The ceiling lighting system of claim 35, wherein the light pipe is bounded by air on both its specified output side and the opposing side, such that light escapes substantially equally out of both opposing surfaces of the light pipe via total internal reflection failure, and further comprising a specularly reflective surface disposed to the opposing side of the pipe, such that light exiting the opposing side hits the reflective surface and re-enters the light pipe, such that substantially all light is ultimately extracted out the specified output side.

37. The ceiling lighting system of claim 35, wherein the optical turning structure is a facetted surface of a light transmitting film that is disposed to the specified output side of the light pipe, the film having its facetted surface disposed toward the light pipe and a flat surface displaced away from the light pipe, the facetted surface configured to turn light by means of first refraction and then total internal reflection.

38. The ceiling lighting system of claim 35, wherein the optical turning structure is a facetted surface of a light transmitting film, the facetted surface coated with reflective material and disposed away from light pipe, the film having a flat transparent surface disposed toward the light pipe, the flat surface optically coupled to the light pipe via a low index or fraction media, the low index media having low index relative to both an index of the film and an index of the light pipe, the low index media causing substantially all total internal reflection failure to occur first on the opposing side of the light pipe, such that substantially all of the light travels through the low index media and into the film, where the light hits the reflective facetted surface of the film and turns, traveling back through the low index media, through the light pipe, and exits out the specified output side of the light pipe.

39. The ceiling lighting system of claim 20, wherein the output apertures of the light emitter are oriented substantially perpendicular to ultimate output apertures of the light distributing engine, the light distributing optics being separable into a first optical group and a second optical group, the first optical group being disposed to collect light output from the source and preserving the original pointing direction of the light, the second optical group being disposed to collect the light from the first optical group and causing a change to the pointing direction of greater than zero degrees and less than one hundred eighty degrees in a plane perpendicular to a plane defined by the output aperture of the light distributing engine, this second change resulting in an ultimate pointing direction of the light distribution that exits the output aperture of the light distributing engine.

40. The ceiling lighting system of claim 20, wherein the output apertures of the light emitter are oriented substantially parallel to an ultimate output aperture of the light distributing engine, the light distributing optics substantially preserving an original pointing direction of the light.

41. The ceiling lighting system of claim 1, wherein the light emitter is a semiconductor or organic light emitting diode (LED).

42. The ceiling lighting system of claim 1, wherein the light emitter is a fluorescent emitting device or micro plasma emitting device.

43. A ceiling lighting system comprising:

a drywall sheet having one or more recesses extending at least partially through the drywall sheet;

a light distributing engine including a light emitter and light distributing optics, the light distributing optics collecting light from the light emitter and directing the light into a directional light distribution such that an output aperture of the light distributing engine is aligned with one of the one or more recesses so that the directional light distribution is substantially transmitted to a space below the drywall sheet;

an electronic circuit;

one or more electrical power connection elements, wherein

the light distributing engine, the electronic circuit, and the one or more electrical power connection elements are substantially disposed within the drywall sheet, thereby requiring little or no plenum space above the drywall sheet;

one or more affixation elements, the one or more affixation elements used to affix the light distributing engine, the electronic circuit, and the one or more electrical power connection elements directly or indirectly to the drywall sheet;

supply-to-sheet power transmitting elements which transmit power from a low voltage DC power supply to on-sheet power input elements embedded in the drywall sheet, on-sheet power transmitting elements transferring power from the on-sheet power input elements to on-sheet embedded electronic circuits and the on-sheet embedded light distributing engine; and

a master controller, comprising one or more user input devices, further comprising receivers that collect broadcasted signals and information from sensor circuits and electronic control circuits embedded in the drywall sheets, one or more computer implemented methods to interpret user inputs as well as the broadcasted signals and information, and a means of broadcasting lighting commands, the lighting commands instructing embedded integrated control circuits regarding power distribution to the light distributing engine on the drywall sheet.

44. The ceiling lighting system of claim 43, further comprising ceiling joists and drywall fasteners, the drywall sheet affixed to the ceiling joists by the drywall fasteners.

45. The ceiling lighting system of claim 43, wherein the embedding of the light distributing engine, electronic circuit, and the one or more affixation elements into the drywall sheet results in fully assembled tile system units that can be subsequently transported as one unit, installed into a ceiling as one unit, and connected to a power supply as one unit, the one unit requiring little or no plenum space above it.