The invention relates to an illuminator and to a system for illumination.
Various industries, including among others, the automotive industry, typically incorporate illumination systems into a variety of applications. The automotive industry, for example, incorporates one or more illumination systems into vehicular cabins such that the cabin is adapted to provide light generally suitable across a range of applications, including ambient lighting for cabin aesthetics and lighting suitable for uses such as reading and the like.
Many conventional systems in the foregoing, and other applications can sometimes require light bulb replacement due to limitations inherently associated with light bulb life. A need for efficient light bulb replacement compels the automotive industry, for example, to provide an illumination system having a first, positive terminal receiver and a second, negative terminal receiver wherein each of the terminal receivers are formatted to removably retain the light bulb.
As LED technology has evolved, the automotive industry has incorporated LED lighting into vehicles, thereby replacing or enhancing conventional incandescent and halogen light bulbs. LEDs have different requirements (i.e., power requirements, heat dissipation requirements, electromagnetic interference, etc.) than the conventional illumination assemblies; and, to integrate the foregoing LED technology, the industry has designed different LED packaging and LED housings (collectively, LED systems) to accommodate the different handling associated with LED systems.
While the industry has readily incorporated LED systems into new vehicles, the conventional packaging associated with incandescent and halogen light bulbs can not easily be retrofitted to accommodate LED systems. For example, the conventional packaging can be insufficient to meet automotive standards for heat dissipation and can be inefficient in curtailing and displacing the electromagnetic radiation (“EMI”) generated by the LED illumination systems.
At least some consumers may also desire to incorporate LEDs into a conventional illumination system; and, thus, there appears to be a need to replace conventional incandescent and halogen systems with the LED technology such that the conventional packaging and housings can be adapted to retrofit the LEDs while maintaining a package that meets and exceeds industry specifications.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, wherein:
Referring now to
In an embodiment, base layer 20 is thermally conductive and, while there could be additional layers there under, forms the underside of board 12. For example, among others, base layer 20 can comprise a metal such as copper or the like; but, other metals or conductors such as copper and the like may also be used therein combination or wholly replaced therefore. It is also noted that base layer 20 can comprise any size or width and the development thereof can be application specific. In an embodiment, base layer 20 may have a thickness between about 1.35 mm and 1.85 mm, however, the invention should not be limited to these described thicknesses. Moreover, upon considering this disclosure and the structure of the packaging or housing to which the illuminator 10 described herein may be employed, base layer 20 may be omitted from the system or replaced with dielectric material comprising a new layer or part of dielectric layer 22, such as fiberglass or otherwise. Specifically, two functions of base layer 20 are to efficiently remove by-products associated with LED lighting from circuit layer 24 and dielectric layer 22, such as heat and electromagnetic interference; and to provide means to impart shape into illuminator 10 as further outlined below.
In an embodiment, dielectric layer 22 is arranged proximate to base layer 20. Dielectric layer 22 is formatted to electrically isolate circuit layer 24 from base layer 20 and/or externalities as desired. Dielectric layer 22 may comprise a number of sub-layers and the present invention should not be limited to a single layer, as illustrated. In an embodiment, dielectric layer 22 material comprises a polymer and ceramic blend formatted to achieve a low thermal impedance. In an embodiment, polymeric material, and/or its equivalent, may be incorporated into dielectric layer 22 as a means to introduce shape to board 12, as described in detail below. For example, the foregoing polymeric material and/or its equivalent has high elongation properties. Among other things, this presentation of materials can be thermoformed or stamped into a desired shape as outlined below. Polymeric material is also desired for its electrical isolation properties, while it is generally resistant to thermal aging and has a high bond strength. The ceramic material enhances thermal conductivity and can maintain a high dielectric strength. While a preferred dielectric composite is described herein, it is appreciated that other dielectric materials could be replaced therefor. In an embodiment, dielectric layer 22 also connects base layer 20 to the circuit layer 24 while electrically providing separation therebetween.
Upon considering the present disclosure, one of ordinary skill in the art will realize that the inventor hereof has conceived a board 12, comprising dielectric layer 22 and thermally conductive base layer 20, that can effectively manage the higher junction temperature that can typically result from LED driving requirements as compared to the requirements typically demanded to drive the conventional incandescent or halogen bulbs without changing the packaging or housing therearound. Specifically, the combination of a thermally conductive base layer 20 and dielectric layer 22 as described hereinabove provides means to draw the heat out of the illuminator 10 and manage electromagnetic interference such that the illuminator can be designed to meet and even exceed thermal control and electrical interference management requirements.
Circuit layer 24 provides electrically conductive traces or the like to bring power to, and lead power away from, LED 16. In an embodiment, circuit layer 24 comprises a conductor comprising a printed circuit foil, formulated from copper or the like. It is noted that conductive material other than the foregoing copper circuit foil may be used in addition to, or as a replacement for, the printed circuit foil. It should also be noted that circuit layer 24 can comprise any size or width and the development thereof is application specific. For example, circuit layer 24 may have a thickness between about 30 μm and 350 μm (between about 1 oz and 10 oz), however the invention should not be limited to these described thicknesses. It will be understood that trace could be formatted in any orientation and the invention hereof should not be limited to the described trace.
Top layer 26 is provided as a solder mask. Solder mask is provided over desired portions of board 12 and circuit layer 24 and, generally, provides insulative protection thereto. For example, among other possibilities, solder mask may not be provided over desired areas of circuit layer 24 such that the certain portions or areas of board 12 may be adapted to provide connection points or pads that can be used to electrically connect, via surface mount technology or otherwise, LED 16 and/or circuit elements 18 to board 12. The mounting of such elements to the foregoing pads is conventionally known and for brevity, do not form part of this disclosure. It will also be appreciated that the thickness of top layer 26 and the material used therefor is application specific and the invention described herein is thereby not limited to any material used for top layer 26. Moreover, it is appreciated that top layer 26 may be wholly omitted as well, and the invention should not be limited thereby.
While the layers are described as base layer 20, dielectric layer 22, circuit layer 24 and top layer 26, these terms are simply nomenclature of convenience and the invention should not be limited by these terms. It is further understood that there may be more than one circuit layer 24, wherein each of the circuit layers 24 may be separated by one or more dielectric layers 22. Moreover, while each of the layers are illustrated contiguous, one or more of the layers may have one or more portions not adjoined with another portion of the same layer.
Referring back to the Figures, in exemplary embodiments described herein, illuminator 10 may be adapted for insertion into conventional illumination systems that may once have supplied power to, lead power away from, and removably retained one or more conventional halogen light bulbs or incandescent light bulbs as described above. And, because the foregoing conventional illumination systems are not, generally, fully capable to appropriately handle conditions related to LED lighting, such as having effective dissipation techniques in place to handle thermal and electromagnetic phenomena that are associated with the various results typical of LED lighting, such as lower junction temperature maximums and increased electromagnetic radiation, the inventor developed a novel illuminator that can appropriately dissipate the foregoing junction and electromagnetic phenomena without necessitating a change or rework of the conventional lighting package or housing.
As previously discussed, it will also be recognized that the described embodiments can also be integrated into new illuminations systems or hybrid systems and the present invention should not be limited to retrofitting the foregoing conventional illumination systems. Thus, another benefit that may be incurred by the invention hereof is that manufacturers or the like can avoid a full re-work or re-tooling of equipment and related technologies, as illuminator 10 can be adapted for use with the preexisting packaging or housings of its conventional illuminator counterparts.
In an embodiment, board 12 defines a first board interface 14 including connector 15 to define a first conductive connection portion 30 in electrical arrangement with LED 16, a second board interface 14 including connector 15 to define a second conductive connection portion 32 also in electrical arrangement with LED 16. In an embodiment, first board interface 14 and second board interface 14 supply power to and receive power from board 12 via connector 15. In an embodiment, connector 15 is electrically connected to circuit layer 24 at planar portion 44 of board 12.
In an embodiment, a region of board interface 14 may comprise base layer 20, dielectric layer 22, circuit layer 24 and/or top layer 26. Referring to
In an embodiment, referring to
Referring now to
Referring now to
In an embodiment, board 12 defines an aperture 40 such that circuit layer 22 exposes a trace that is incorporated into side surface 36′ and defines a board interface 14. In this manner, terminal receiver (A) can be directly attached to trace by extending through aperture 40. Upon further considering the present disclosure, it is appreciated that side surface 36′ could be provided on any side surface of board 12 and the present invention should not be limited to aperture 40 as described. For example, board interface 14 could be provided on an external surface and board 12 may or may not have an aperture defined therein. While specific configurations are disclosed, it will be appreciated that one or all of the embodiments described herein may incorporated into an illuminator and the present invention should not be limited to the disclosed orientations or combinations.
Referring now to
According to an embodiment, an illuminator is shown generally at 100 in
As shown in
According to an embodiment, an illuminator is shown generally at 200 in
Referring to
In an embodiment, at least a portion of top layer 26 is omitted or otherwise not included upon at least a portion of reflector portion 50 such that an exposed surface of reflector portion 50 comprises at least a portion of one or more of base layer 20, dielectric layer 22 and/or circuit layer 24. That is, one of the foregoing layers may be exposed and formatted to reflect the light as desired. In an embodiment, top layer 26 can be etched away from said board 12 along at least a portion of reflector portion 50 to expose or reveal one or all of the foregoing layers. For example, it may be desired to expose a conductive or metallic layer for its known reflective properties. In an embodiment, top layer 26 may never be added over at least a portion of reflector portion 50 to expose one or all of the foregoing layers such that the etching process is not needed. In an embodiment, top layer 26 is provided about reflector portion 50 such that top layer 26 may be used as reflector portion 50 instead of, or in addition to, the foregoing layers. Finally, a reflective material (such as, for example, a coating or the like) may be added to board 12 about at least a portion of reflector portion 50.
For convenience, the disclosure hereof describes and illustrates two reflector portions 50, however, one of ordinary skill in the art will readily recognize that any number of reflector portions 50 could be incorporated into illuminator using the principles described herein.
With reference to
With reference to
Typically, as mentioned hereinabove a bending, stamping or otherwise adding shape to an integral portion of conventional boards can result in cracking or delamination of a portion of dielectric layer 22 and thereby provides unmanageable risks thereby. Conventionally, shape could not be imparted on planar boards because, without the invention described herein, degradation results in one or more of the foregoing layers from conventional shaping processes; however, the following shaping process ensures board integrity after the shaping process. For example, conventionally, electrical contact resulting from degradation of one of the layers can ultimately short out illuminator 10 and render illuminator 10 ineffective and unusable.
In an embodiment, and as described hereinbefore, board 12 is thermoformable via the foregoing construction of layers 20, 22, 24, 26 and the following process to thereby allow shape to be imparted upon board 12 without adversely affecting circuit layer 24 and/or dielectric layer 22. In an embodiment, board 12 is stamped about this portion to form the shape of reflector 50 and/or the shape of board interface 14.
As previously described, board 12 can be shaped, via a stamping process, to create one or more board interfaces 14 having connector 15 (i.e.,
Connector 15 is arranged over a portion of board 12 during this process and is adapted to directly receive a surface of press and substantially evenly disperse the stamping force associated with and incurred from press to board 12. Connector 15 and press are arranged to impart the desired board shape to define at least one of board interface 14.
In an embodiment, connector 15 is arranged substantially planar with board 12 before the stamping occurs and is arranged to directly receive at least a majority of the press surface during the stamping process. Connector 15 prevents cracking of dielectric layer 22 to ensure that base layer 20 and circuit layer 24 do not contact one another.
In an embodiment, heat may be applied to thermoform board 12 in cooperation with the foregoing stamping or shaping process, or wholly separate thereto.
In an embodiment, reflector portion 50 is formed from a heating and bending process. As described above, it is also within the present contemplation to use the foregoing stamping process to create reflector portion 50, in combination with a heating and bending or wholly separate therefrom. It is noted that the buffer may be incorporated into the reflector; however, the invention should not be limited thereby such that the buffer may be reused for additional manufacturing. Moreover, while a particular reflector shape is illustrated, it will be appreciated that reflector 50 could comprise any shape and the present invention should not be limited to the exemplary, illustrated shape.
The present invention has been particularly shown and described with reference to the foregoing embodiments, which are merely illustrative of the best modes for carrying out the invention. It should be understood by those skilled in the art that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention without departing from the spirit and scope of the invention as defined in the following claims. It is intended that the following claims define the scope of the invention and that the method and apparatus within the scope of these claims and their equivalents be covered thereby. This description of the invention should be understood to include all novel and non-obvious combinations of elements described herein, and claims may be presented in this or a later application to any novel and non-obvious combination of these elements. Moreover, the foregoing embodiments are illustrative, and no single feature or element is essential to all possible combinations that may be claimed in this or a later application.
This application claims the benefit of earlier filed U.S. Provisional Application Ser. No. 60/792,022, filed Apr. 14, 2006, which is incorporated herein by reference in its entirety.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CA07/00613 | 4/16/2007 | WO | 00 | 10/15/2008 |
Number | Date | Country | |
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60792022 | Apr 2006 | US |