GB2568863A - A lighting device comprising a waveguide - Google Patents

A lighting device comprising a waveguide Download PDF

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Publication number
GB2568863A
GB2568863A GB1716340.3A GB201716340A GB2568863A GB 2568863 A GB2568863 A GB 2568863A GB 201716340 A GB201716340 A GB 201716340A GB 2568863 A GB2568863 A GB 2568863A
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GB
United Kingdom
Prior art keywords
transparent material
lighting device
curved
lamp housing
end portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1716340.3A
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GB201716340D0 (en
Inventor
Wilfred James Halton Luke
Kit Buchanan William
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Waveguide Lighting Ltd
Original Assignee
Waveguide Lighting Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Waveguide Lighting Ltd filed Critical Waveguide Lighting Ltd
Priority to GB1716340.3A priority Critical patent/GB2568863A/en
Publication of GB201716340D0 publication Critical patent/GB201716340D0/en
Publication of GB2568863A publication Critical patent/GB2568863A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G02B6/001—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 the light being emitted along at least a portion of the lateral surface of the fibre
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • 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
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • 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
    • G02B6/0011—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 planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A lighting device comprising one or more, preferably plural, transparent curved waveguides 10, 12 which carry light by total internal reflection, and each waveguide has two end portions at opposite end. Each waveguide has a reflective portion (35, fig 3) for reflecting light out of the waveguide, and this can be formed as a coating on the exterior surface of the waveguide, and can run the length of the waveguide. There is further one or more, preferably more, lamp housings 14, 16, each with one or more LED’s, that connect to a plurality of waveguide end portions, preferably end portions from different waveguides. Ideal embodiments would comprise two waveguides and two LED housings, or one waveguide with both ends connecting to one lamp housing. The housings can have heatsinks for the LED’s which can have metal-core circuit boards, and can have collars 22, 24 for receiving the end portions.

Description

A LIGHTING DEVICE COMPRISING A WAVEGUIDE
DESCRIPTION
The present invention relates to a lighting device comprising a waveguide, in particular a waveguide with a reflector for reflecting light out of the waveguide.
BACKGROUND OF THE INVENTION
In recent years, Light Emitting Diode (LED) technology has developed to the point where it can start to replace conventional incandescent and strip lighting. One of the problems in adapting LEDs to emulate known strip lighting is that LED’s are typically point light sources which do not emit light over large areas, like the phosphors in conventional strip lights can.
It is known to solve this problem by providing a length of transparent material that defines a waveguide. Then, light from an LED can be emitted into an end of the waveguide, and the light will travel along the waveguide by total internal reflection, in a similar manner to light inside of an optical cable. A reflective material can be formed on a surface of the waveguide to disrupt the total internal reflection and cause the light to be emitted from the waveguide. For example, a known waveguide of that type is described in GB 2,398,372. However, such waveguides are typically linear in shape, and cannot serve as a replacement for conventional curved strip lights.
It is therefore an object of the invention to provide an improved lighting device.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided a lighting device comprising one or more lamp housings and one or more waveguides formed by one or more curved lengths of transparent material that carry light along the curved lengths by total internal reflection. Each curved length of transparent material has a reflector to reflect light out of the transparent material, and two end portions at opposite ends of the curved length from one another. Each lamp housing connects a plurality of the end portions of the one or more curved lengths together, and comprises one or more LEDs that emit light into the plurality of the end portions.
Since each lamp housing connects a plurality of the end portions together, a single light housing can emit light into more than one end portion, reducing the number of lamp housings required to light the curved length(s) of transparent material. For example, if there is only one curved length of transparent material, then a single lamp housing can emit light into both ends of that curved length of transparent material. Directing light into both end portions of the curved length of transparent material helps provide a more uniform intensity of light emission along the curved length of the transparent material.
The curved length of transparent material may curve by 180 degrees, for example if the end portions connect to the lamp housing at a same side of the lamp housing as one another, or may curve by 360 degrees, for example if the end portions connect to the lamp housing at opposites sides of the lamp housing from one another.
The one or more curved lengths of transparent material may consist of a plurality of curved lengths of transparent material, wherein each lamp housing connects end portions of different ones of the plurality of curved lengths of transparent material to one another. The plurality of curved lengths of transparent material may be formed to produce various light emission patterns.
Each curved length of transparent material may comprise an exterior surface that defines an exterior of the waveguide through which light is emitted. The transparent material may for example be in the shape of a cylinder that is bent to curve it, although other shapes are also possible. Preferably, the transparent material has a uniform cross section along its curved length, for example it may be formed as an extrusion of a plastics material, such as acrylic. Alternatively, the transparent material may be moulded, either moulded as a curved length of transparent material, or moulded as a straight length of transparent material and then heated and bent into the curved shape. Moulding may produce a transparent material of higher optical quality than extrusion.
The transparent material carries light along the waveguide by total internal reflection, and each curved length of transparent material may consist of a single block of transparent material. The light is transmitted through the transparent material, and internally reflects at the exterior surfaces of the transparent material. The light that reflects off the reflector does not internally reflect when it reaches the exterior surface of the transparent material, but instead passes through the exterior surface and out of the waveguide.
The one or more lamp housings may consist of a plurality of lamp housings, for example the number of lamp housings may equal the number of curved lengths of transparent material, each lamp housing connecting together two of the curved lengths of transparent material. The plurality of lamp housings and the plurality of curved lengths of transparent material may connect to form a network of the curved lengths of transparent material to produce various shaped lighting patterns.
The reflector disrupts the total internal reflection along the waveguide and causes some of the light being carried along the waveguide to exit the transparent material at an opposite side of the transparent material from the reflector. Preferably, the reflector of each curved length of transparent material is a reflective strip on or adjacent an exterior surface of the curved length of transparent material.
The reflective strip is optionally formed as a coating on the exterior surface of each curved length of transparent material, for example the coating maybe formed by a reflective white paint. Preferably, the reflector extends along substantially a full length of the curved length of transparent material, so that the curved length of transparent material emits light substantially along its full length.
Each lamp housing may comprise a plurality of collars that receive respective ones of the end portions of the curved length(s) of transparent material, to connect the curved length(s) of transparent material to the lamp housings. The end portions may be inserted into the collars, and may be held there by friction. Preferably, each collar is provided with a reflective end wall that reflects light emanating out from the corresponding end portion, back into the end portion. The reflective end wall has one or more apertures for light to be emitted from inside the light housing, to and into the corresponding end portion.
Each lamp housing may comprise a main body having the one or more LEDs. Optionally, LED drivers for the one or more LEDs may be incorporated within the lamp housing, to improve the compactness of the lighting device, rather than requiring LED drivers to be implemented remotely.
The plurality of collars are preferably implemented on the side(s) of the main body. The side(s) of the main body may form the reflective end walls for the collars, or the collars may have integral bases which form the reflective end walls. The plurality of collars may comprise two collars that are positioned on opposite sides of the main body from one another, to provide an even weight distribution about the main body when the curved length(s) of transparent material are fitted into the collars.
The main body preferably comprises a heatsink that dissipates heat from the one or more LEDs, to prevent overheating and maximise the lifetimes of the LEDs. Advantageously, the heatsink may define a base for mounting the lighting device to a lamp holder, so that excess heat can be conducted to the lamp holder.
In some embodiments, at least one of the one or more LEDs emits light into more than one of the end portions connected to the lamp housing. This can help minimise the number of LED’s that are required, compared to providing a separate lamp housing for each respective end portion. Alternatively, each lamp housing may comprise a plurality of sets of the one or more LEDs, wherein each set of LEDs emits light into a respective one of the end portions connected to the lamp housing.
Each set of LEDs may be mounted to a respective circuit board inside the lamp housing, and the circuit boards may all be mounted on the heatsink and be angled to direct light towards the end portions of the curved length(s) of transparent material. For example, there may be two circuit boards mounted backto-back relative to one another, to direct light into two end portions connected at opposite sides of the lamp housing to one another.
To help aid heat conduction away from the LEDs, the circuit board(s) may be metal-core circuit boards.
DETAILED DESCRIPTION
Embodiments of the invention will now be described by way of non-limiting example only and with reference to the accompanying drawings, in which:
Fig. 1 shows a schematic perspective diagram taken from above a lighting device according to an embodiment of the invention;
Fig. 2 shows a schematic cross-sectional diagram, taken along line XS1 marked on Fig 1;
Fig. 3 shows a schematic plan diagram taken from beneath the lighting device of Fig. 1;
Fig. 4 shows a schematic side elevation diagram taken looking in from direction 4 marked on Fig. 1;
Fig. 5 shows a schematic cross-sectional diagram taken looking in from line A-A marked on Fig. 4;
Fig. 6 shows an enlarged schematic cross-sectional diagram of a lamp housing shown in Fig. 5; and
Fig. 7 shows a schematic perspective diagram of the lamp housing of Fig. 6.
The figures are not to scale, and same or similar reference signs denote same or similar features.
The schematic diagram of Fig. 1 shows a perspective view of a lighting device according to an embodiment of the invention. The lighting device comprises two curved lengths of transparent material 10 and 12, and two lamp housings 14 and 16, which are arranged in between the curved lengths of transparent material 10 and 12. The curved length of transparent material 10 is curved by 180 degrees, and has two end portions at opposite ends of the curved length to one another. One of the end portions is received in the lamp housing 14, and the other end portion is received in the lamp housing 16. The curved length of transparent material 12 is also curved by 180 degrees, and has two end portions at opposite ends of the curved length to one another. One of the end portions is received in the lamp housing 14, and the other end portion is received in the lamp housing 16.
Each lamp housing 14, 16 has a main body 20 with a collar 22 and a collar 24 at opposite sides of the lamp housing. The collar 22 has an integral base 21, and the collar 24 has an integral base 23, the integral bases being mounted to the main body 20. The collar 22 of the lamp housing 14 receives one end portion of the curved length of transparent material 12, and the collar 22 of the lamp housing 16 receives the other end portion of the curved length of transparent material 12. The collar 24 of the lamp housing 14 receives one end portion of the curved length of transparent material 10, and the collar 24 of the lamp housing 16 receives the other end portion of the curved length of transparent material 10.
Each lamp housing 14, 16 also comprises a base 26 for mounting the lighting device to a lamp holder (not shown in Figs). The base 26 is part of a heatsink for dissipating heat from LEDs inside the lamp housing.
Although the illustrated embodiment has two lamp housings and two curved length of transparent material, it will be appreciated that the general concepts of the invention can easily be extended to other numbers of lamp housing(s) and curved length(s) of transparent material. For example, the lamp housing 14 could be omitted and the two curved lengths of transparent material 10 and 12 formed together as a single length of transparent material that curves by 360 degrees all the way from the collar 22 to the collar 24 of the lamp housing 16.
In another example, two additional lamp housings could be added at the locations generally designated by the arrows 4 and 5, by splitting each curved length of transparent material 10 or 12 into two separate curved lengths of transparent material, so that there are a total of four lamp housings and four curved lengths of transparent material arranged alternatively with one another. Each curved length of transparent material would then curve by 90 degrees. The number of lamp housings needed largely depends on how much light is required to be emitted from the overall lighting device.
Each curved length of transparent material comprises a solid body of material with a reflector aligned along its length. The schematic diagram of Fig. 2 shows a cross-section taken through the curved length of transparent material 12, along line XS1 marked on Fig. 1. It can be seen in Fig. 2 that the curved length of transparent material 12 has a circular cross section, and a reflector 35 is shown at a bottom of the curved length of transparent material 12. In this embodiment, the curved length of transparent material 12 is a solid body of clear acrylic material, and the reflector 35 is a reflective strip of white paint that has been painted onto the lower exterior surface of the curved length of transparent material 12.
In use, light from the lamp housings 14 and 16 travels along the curved length of transparent material 12, by total internal reflection, and the reflector 35 on the lower exterior surface of the curved length of transparent material 12 disrupts the total internal reflection and causes light to be reflected out of the curved length of transparent material 12 via the upper exterior surface 13 of the curved length of transparent material 12.
The schematic diagram of Fig. 3 shows a plan view from beneath the lighting device. The reflective strips 35 can be seen on the lower exterior surfaces of the curved lengths of transparent material 10 and 12, and each reflective strip 35 extends substantially along the full length of the corresponding curved length of transparent material. The bases 26 of the light housings can also be seen, and each base 26 is substantially rectangular with a flat metallic surface facing away from the light housing, to aid heat conduction.
The schematic diagram of Fig. 4 shows a side elevation of the lighting device, taken looking in the direction of arrow 4 marked on Fig. 1. Fig. 4 shows the lighting device has a low thickness, and so can easily be accommodated into existing lamp holders. The strip of reflective material 35 is visible on the lower exterior surface of the curved length of transparent material 12.
The schematic diagram of Fig. 5 shows a cross-sectional view looking in from line A-A marked in Fig. 4, and the strips of reflective material 35 are visible through the curved lengths of transparent material 10 and 12. The schematic diagram of Fig. 6 shows an enlarged view of a portion 50 of Fig. 5, where further details of the lamp housing 14 can be seen.
The curved length of transparent material 10 has an end portion 10a which is a friction fit in the collar 24, and the curved length of transparent material 12 has an end portion 12a which is a friction fit in the collar 22. The integral base 21 (see Fig. 1) of the collar 22 provides a reflective surface 27 which reflects any light exiting the end portion 12a, back into the end portion 12a. Similarly, the integral base 23 (see Fig. 1) of the collar 24 provides a reflective surface 28 which reflects any light exiting the end portion 10a, back into the end portion 10a. The reflective surfaces 27 and 28 help reduce light losses in the lighting device.
Also visible in Fig. 6 are two metal-core circuit boards 41 and 42, which are mounted to the base heatsink 26 inside the main body 20, and extend perpendicular thereform. Each circuit board 41 and 42 comprises a set of LEDs which emit light into the end portions 12a and 10a, respectively. The reflective surfaces 27 and 28 have apertures (not shown in Figs) adjacent the LEDs on the circuit boards, to allow the light from the LEDs to pass through the reflective surfaces 27 and 28. A small gap is provided between the end portions 10a and 12a and the corresponding reflective surfaces 28 and 27, to help reduce heat conduction from the LEDs to the curved lengths of transparent material.
The schematic diagram of Fig. 7 shows a perspective view of the lamp housing 14, which is the same as the lamp housing 16. Since the lamp housings are the same as one another, they are easy to incorporate into different arrangements requiring differing numbers of lamp housings, such as the alternate embodiments described earlier where the is only one lamp housing, or four lamp housings.
The lamp housing 14 has the collars 22 and 24, which are each a short circular tube extending from the integral base 21 or 23. Each short circular tube is open at one end for receiving a curved length of transparent material, and closed at the other end by the reflective surfaces 27 and 28 of the integral bases. A ridge 29 runs around the internal circumference of the circular tube, reducing the internal diameter of the circular tube and preventing the curved length of transparent material from being inserted too far into the collar.
The base 26 of the lamp housing has two holes 26a at opposing sides of the lamp housing, to allow to lamp housing to be mounted to a lamp holder.
Many other variations of the described embodiments falling within the scope of the invention will be apparent to those skilled in the art. For example, the circuit boards 41 and 42 could be replaced by a single circuit board mounted flat on the base 26 instead of extending perpendicular therefrom, and one or more lenses or reflectors that direct light from LEDs on the circuit board through the apertures in the reflective surfaces 27 and 28.

Claims (21)

1. A lighting device comprising one or more lamp housings and one or more waveguides formed by one or more curved lengths of transparent material that carry light along the curved lengths by total internal reflection, wherein each curved length of transparent material has a reflector to reflect light out of the transparent material, and two end portions at opposite ends of the curved length from one another, wherein each lamp housing connects a plurality of the end portions of the one or more curved lengths together, and comprises one or more LEDs that emit light into the plurality of the end portions.
2. The lighting device of claim 1, wherein the one or more curved lengths of transparent material consist of a plurality of curved lengths of transparent material, and wherein each lamp housing connects end portions of different ones of the plurality of curved lengths of transparent material to one another.
3. The lighting device of claim 2, wherein the one or more lamp housings consist of a plurality of lamp housings.
4. The lighting device of claim 2 or 3, wherein the plurality of curved lengths of transparent material consist of two curved lengths of transparent material.
5. The lighting device of claim 4, wherein the plurality of lamp housings consist of two lamp housings.
6. The lighting device of claim 1, wherein the one or more curved lengths of transparent material consist of only one curved length of transparent material, wherein the one or more lamp housings consist of only one lamp housing, and wherein the lamp housing connects the end portions of the curved length of transparent material together with one another.
7. The lighting device of any preceding claim, wherein the two end portions of each curved length of transparent material are a first end portion and a second end portion, and wherein each curved length of transparent material curves by substantially 180 degrees from its first end portion to its second end portion.
8. The lighting device of any one of claims 1 to 6, wherein the two end portions of each curved length of transparent material are a first end portion and a second end portion, and wherein each curved length of transparent material curves by substantially 360 degrees from its first end portion to its second end portion.
9. The lighting device of any preceding claim, wherein the reflector of each curved length of transparent material is a reflective strip on or adjacent an exterior surface of the curved length of transparent material.
10. The lighting device of any preceding claim, wherein the reflective strip is formed as a coating on the exterior surface of the corresponding curved length of transparent material.
11. The lighting device of any preceding claim, wherein the reflector extends along substantially a full length of the curved length of transparent material.
12. The lighting device of any preceding claim, wherein each lamp housing comprises a plurality of collars that receive respective ones of the end portions.
13. The lighting device of any preceding claim, wherein each lamp housing comprises a main body having the one or more LEDs.
14. The lighting device of claim 13 when appended to claim 12, wherein the plurality of collars comprise two collars that are positioned on opposite sides of the main body from one another.
15. The lighting device of claim 13 or 14, wherein the main body comprises a heatsink that dissipates heat from the one or more LEDs.
16. The lighting device of claim 15, wherein the heatsink defines a base for mounting the lighting device to a lamp holder.
17. The lighting device of any preceding claim, wherein at least one of the one or more LEDs emits light into more than one of the end portions connected to the lamp housing.
18. The lighting device of one of claims 1 to 16, wherein each lamp housing comprises a plurality of sets of the one or more LEDs, wherein each set of LEDs emits light into a respective one of the end portions connected to the lamp housing.
19. The lighting device of claim 18, wherein each lamp housing comprises a plurality of circuit boards, wherein each set of the one or more LEDs are mounted on a respective one of the circuit boards, and wherein the circuit boards are mounted back-to-back relative to one another.
20. The lighting device of any one of claims 18 and 19, when appended to any one of claims 15 and 16, wherein the circuit boards are all mounted to the heatsink.
21. The lighting device of claim 19 or 20, wherein the circuit board are metalcore circuit boards.
GB1716340.3A 2017-10-06 2017-10-06 A lighting device comprising a waveguide Withdrawn GB2568863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1716340.3A GB2568863A (en) 2017-10-06 2017-10-06 A lighting device comprising a waveguide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1716340.3A GB2568863A (en) 2017-10-06 2017-10-06 A lighting device comprising a waveguide

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GB201716340D0 GB201716340D0 (en) 2017-11-22
GB2568863A true GB2568863A (en) 2019-06-05

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GB1716340.3A Withdrawn GB2568863A (en) 2017-10-06 2017-10-06 A lighting device comprising a waveguide

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1099902A1 (en) * 1999-11-13 2001-05-16 Robert Bosch Gmbh Lighting unit
DE102007013024A1 (en) * 2006-03-20 2007-09-27 Avago Technologies General Ip (Singapore) Pte. Ltd. Illumination structure with a flexible light guide coupled to a light source
US20160223145A1 (en) * 2015-02-04 2016-08-04 Ming D&Y Inc. Light transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1099902A1 (en) * 1999-11-13 2001-05-16 Robert Bosch Gmbh Lighting unit
DE102007013024A1 (en) * 2006-03-20 2007-09-27 Avago Technologies General Ip (Singapore) Pte. Ltd. Illumination structure with a flexible light guide coupled to a light source
US20160223145A1 (en) * 2015-02-04 2016-08-04 Ming D&Y Inc. Light transmission

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