1. Technical Field
The present invention is directed to a lighting assembly which may include passive cooling components integrated therein.
2. Background
Lighting assemblies such as lamps, ceiling lights, and track lights are important fixtures in any home or place of business. Such assemblies are used to not only illuminate an area, but often also to serve as a part of the décor of the area. However, it is often difficult to combine both form and function into a lighting assembly without compromising one or the other.
Traditional lighting assemblies typically use incandescent bulbs. Incandescent bulbs, while inexpensive, are not energy efficient, and have a poor luminous efficiency. To attempt to address the shortcomings of the incandescent bulbs, a move is being made to use more energy efficient and longer lasting sources of illumination, such as fluorescent bulbs and light emitting diodes (LEDs). Fluorescent bulbs require a ballast to regulate the flow of power through the bulb, and thus can be difficult to incorporate into a standard lighting assembly. Accordingly, LEDs, formerly reserved for special applications, are increasingly being considered as a light source for more conventional lighting assemblies.
LEDs offer a number of advantages over incandescent and fluorescent bulbs. For example, LEDs produce more light per watt than incandescent bulbs, LEDs do not change their color of illumination when dimmed, and LEDs can be constructed inside solid cases to provide increased protection and durability. LEDs also have an extremely long life span when conservatively run, sometimes over 100,000 hours, which is twice as long as the best fluorescent bulbs and twenty times longer than the best incandescent bulbs. Moreover, LEDs generally fail by a gradual dimming over time, rather than abruptly burning out, as do incandescent bulbs. LEDs are also desirable over fluorescent bulbs due to their decreased size and lack of need of a ballast, and can be mass produced to be very small and easily mounted onto printed circuit boards.
LEDs, however, have heat-related limitations. The performance of an LED often depends on the ambient temperature of the operating environment, such that operating an LED in an environment having a moderately high ambient temperature can result in overheating the LED, and premature failure of the LED. Moreover, operation of an LED for extended period of time at an intensity sufficient to fully illuminate an area may also cause an LED to overheat and prematurely fail. Accordingly, an important consideration in using an LED in a lighting assembly is to provide adequate passive or active cooling.
Active cooling mechanisms, such as fans, may be difficult to implement in a lighting assembly, as they often increase the size and power consumption of the assembly, and drain additional power. Passive cooling structures, such as heat sinks, may also be difficult to incorporate as they increase the size of the lighting assembly. Moreover, traditional heat sinks can be as much of a detriment to incorporation in traditional lighting assignments as a ballast can be in a fluorescent bulb assembly. Accordingly, there is a need for providing adequate cooling in a lighting assembly, such as an LED lighting assembly, without significantly increasing the size, and without taking away from the aesthetics and ambience that a lighting assembly can add to an area.
Consistent with the present invention, there is provided a lighting assembly comprising a light module including a lighting element; an enclosure having a recess for receiving and housing the light module; a thermally conductive core connected to the light module through the enclosure; and a housing mounted in thermal contact with the core and the enclosure, so as to cause the housing to dissipate heat to an ambient atmosphere.
Consistent with the present invention, there is also provided a method for manufacturing a lighting assembly, comprising affixing a top core portion of a thermally conductive core to a bottom enclosure portion of an enclosure using a thermally-conductive adhesive; affixing a housing to a bottom core portion of the thermally-conductive core using a thermally-conductive adhesive; resiliently mounting a light module, including at least one lighting element, on a top enclosure portion in a recess of the enclosure using spring compression; and attaching a protective cover to the enclosure to enclose the light module.
Also consistent with the present invention, a light module is provided for use in a lighting assembly. The light module comprises a mounting base positioned on the lighting assembly, a first thermally conductive material positioned between the lighting assembly and the mounting base, a lighting element mounted on the mounting base, a second thermally conductive material positioned between the lighting element and the mounting base, and a resilient mounting component removably affixing the light module in the lighting assembly.
Additional features and advantages consistent with the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The features and advantages consistent with the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate one embodiment consistent with the invention and together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the exemplary embodiments consistent with the present invention, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
In some embodiments consistent with the present invention, lighting assembly may also include a mounting bracket 50, and a power cable 52. Mounting bracket 50 may be used to mount lighting assembly 100 to a stationary fixture, such as a wall, a light stand, or a ceiling. In an embodiment consistent with the present invention, mounting bracket 50 may be used to mount lighting assembly 100 to a track used in a track lighting fixture. Power cable 52 may be used as a connector to provide power from an external power source to lighting assembly 100.
Returning to
Peripheral holes 16 may be formed on the periphery of cover 10 such that they are equally spaced and expose portions along an entire periphery of the cover 10. Although a plurality of peripheral holes 16 are illustrated, embodiments consistent with the present invention may use one or more peripheral holes 16 or none at all. Consistent with an embodiment of the present invention, peripheral holes 16 are designed to allow air to flow through cover 10 and over light module 60 to dissipate heat. Consistent with another embodiment of the present invention, peripheral holes 16 may be used to allow light emitted from light module 60 to pass through peripheral holes 16 to provide a corona effect on cover 10.
Enclosure 20 may include a recess 21 wherein light module 60 is removably mounted. Enclosure 20 may also include a mounting ring 22 having a plurality of electrical contacts 23 attached thereon using fasteners 24. A power source opening 25 may be formed on a periphery of enclosure 20, and a power source grommet may be attached to power source opening 25 for receiving power source cable 52 and establishing an electrical connection with electrical contacts 23. In embodiments consistent with the present invention, power source cable 52 may be fixably attached to enclosure 20, however in other embodiments consistent with the present invention, power source cable 52 may be removably attached to enclosure 20.
Fastening holes 26 may be further formed on a periphery of enclosure 20 for use in fastening mounting bracket 50 to enclosure 20 using fastening screws 27. Ventilation holes 28 may also be formed on a bottom surface of enclosure 20 for allowing air to flow over light module 60 and out to an ambient atmosphere or through housing 30 and then out to an ambient atmosphere, thereby passively assisting in cooling light module.
Consistent with an embodiment of the present invention, electrical contacts 23 provide an electrical connection to light module 60 when light module is mounted therein. Contact pads (not illustrated) may be attached to a bottom surface of light module 60 for establishing an electrical connection with electrical contacts so that when power source cable 52 is plugged into enclosure 20, power is provided through power source cable 52 to electrical contacts 23 and into light module 60 through the contact pads.
Consistent with the present invention, light module 60 may be removable from the enclosure using, for example, plug-in connections. Removable light module 60 may allow a user to safely remove power from light module 60 so that the user can then remove light module 60 and replace, repair, calibrate, or test light module 60. Specifically, light module 60 may be formed to be replaceable, allowing a user to replace light module 60 without having replace any of the other components of lighting assembly 100. Moreover, light module 60 may be removed and replaced while lighting assembly 100 remains mounted.
Consistent with the present invention, core 40 acts as a conduit for conducting heat produced by light module 60 through enclosure 20 and out to an ambient atmosphere through portions of housing 30 and through an end portion of core 40.
Housing 30 may be made from an extrusion including a plurality of surface-area increasing structures, such as ridges 32. Ridges 32 may serve multiple purposes. For example, ridges 32 may provide heat dissipating surfaces so as to increase the overall surface area of housing 30, providing a greater surface area for heat to dissipate to an ambient atmosphere over. That is, ridges 32 may allow housing 30 to act as an effective heat sink for lighting assembly 100. Moreover, ridges 32 may also be formed into any of a variety of shapes and formations such that housing 30 takes on an aesthetic quality. That is, ridges 32 may be formed such that housing 30 is shaped into an ornamental extrusion having aesthetic appeal. For example, housing 30, as shown in
Housing 30 may also include a plurality of housing holes 34, which are formed to extend from a top portion of housing 30 (to the left in
Consistent with the present invention, housing 30 may further include a core hole 36 which extends from a top portion of housing 30 through a bottom portion thereof (to the right in
Housing 30 may be affixed to core 40 such that a top surface of the top portion of housing 30 is flush with a bottom surface of enclosure 20, thereby establishing secure thermal contact between housing 30 and enclosure 20. A thermally-conductive adhesive may further be used to resiliently establish the thermal contact between housing 30 and enclosure 20. Establishing a secure thermal contact between housing 30 and enclosure may aid in cooling light module 60. For example, a top surface of ridges 32 may be mounted flush against a bottom portion of enclosure 20 such that heat generated by light module 60, which is resiliently mounted in recess 21 of enclosure 20, is conducted through the bottom portion of enclosure 20, into ridges 32, and then dissipated into the ambient atmosphere.
As shown in
Second circuit board 66 may be formed such that second circuit board hole 67 receives a top portion 69A of mounting base 69. Consistent with the present invention, mounting base 69 may be formed such that top portion 69A is narrower than a bottom portion, allowing top portion 69A to extend through second circuit board hole 67. Moreover, mounting base 69 may formed from a material having a high thermal conductivity. Consistent with the present invention, mounting base 69 may be formed from copper. Lighting element 65 may then be mounted on top surface 69A of mounting base 69.
As shown in
Lighting element 65 may then be mounted on mounting base 69 using fasteners 71, which may be screws or other well-known fasteners. Positioned between lighting element 65 and mounting base 69 is a first thermally-conductive material 72, which acts as a void-filler between lighting element 65 and mounting base 69. Essentially, the machining of both the bottom surface of lighting element 65 and mounting base 69 during the manufacturing process may leave minor imperfections in these surfaces, forming voids. These voids may be microscopic in size, but may act as an impedance to thermal conduction between the bottom surface of lighting element 65 and top surface 69A of mounting base 69. First thermally-conductive 72 material then acts to fill in these voids to reduce the thermal impedance between lighting element 65 and mounting base 69, resulting in improved thermal conduction. Moreover, consistent with the present invention, first thermally-conductive material 72 may be a phase-change material which changes from a solid to a liquid at a predetermined temperature, thereby improving the gap-filling characteristics of first thermally-conductive material 72. For example, thermally-conductive material 72 may include a Hi-Flow 225F-AC phase-change material, manufactured by The Bergquist Company, which is designed to change from a solid to a liquid at 55° C.
Mounting base 69 having lighting element 65 mounted thereon is then resiliently mounted to the stacked first circuit board 63 and second circuit board 66 using resilient mounting components 68. Consistent with the present invention, mounting base 69 may be mounted to the stacked first circuit board 63 second circuit board 66 using resilient mounting components 68 prior to mounting lighting element 65 on mounting base 69.
Resilient mounting components 68 may be located so as to mount mounting base 69 to the stacked first and second circuit boards 63 and 66 and provide a substantially even clamping force across the surfaces of lighting element 65 and mounting base 69. By using resilient mounting components 68, the thermal impedance caused by voids between lighting element 65 and mounting base 69 are minimized, and thermal conductivity is improved. In the embodiment illustrated in
A bottom surface of light module 60 may be mounted in recess 21 of enclosure 20 (
Consistent with the present invention, second circuit board 66 may have at least one secondary LED 74 mounted on a back surface. As shown in
Detachable protective shroud 61 may also be mounted on lighting element 65 to protect tapered optical assembly 62, and other components on the first and second circuit boards. Consistent with one embodiment of the present invention, detachable protective shroud is made from a synthetic material, and is mounted such that it rests upon a top surface of first circuit board 63.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
This application claims the benefit of priority to U.S. Provisional Patent Application No. 60/809,569, filed May 30, 2006, the entire contents of which are hereby incorporated by reference in their entirety.
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