1. Field of the Invention
The disclosure relates to LEDs, and more particularly to an LED lamp providing a wide illumination area.
2. Description of Related Art
The technology of light emitting diodes has been rapidly developed in recent years, allowing expansion of application from indicators to include illumination. With the features of long-term reliability, environment friendliness and low power consumption, the LED is viewed as a promising alternative for recent lighting products.
A conventional LED lamp comprises a heat sink and a plurality of LED modules having LEDs, attached to an outer surface of the heat sink to dissipate heat generated by the LEDs. The outer surface of the heat sink is generally planar with the LEDs arranged closely. However, such LEDs mounting on the planar outer surface of the heat sink provides only a planar light source.
What is needed, therefore, is an LED lamp providing a sufficiently wide illumination area to function as a three-dimensional light source.
An LED lamp includes a heat sink, a plurality of fin arrays mounted on the heat sink, and a plurality of LED modules mounted on the fin arrays. The heat sink includes a base and a plurality of dissipating fins extending from the base. The fin arrays are mounted on a top surface of the base of the heat sink. Each fin array has a bottom mounting surface in contact with the top surface of the base and a top engaging surface at an acute angle with respect to the top surface of the base. The LED modules are mounted on the engaging surfaces of the fin arrays, respectively. Each fin array comprises a plurality of fins parallel and spaced apart. A plurality of air passages are defined between the fins.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
The heat absorbing plates 30 are elongated metal. Each LED module 40 comprises an elongated printed circuit board 42 and a plurality of spaced LEDs 44 evenly mounted on a side of the printed circuit board 42. The LEDs 44 of each LED module 40 are arranged along a longitudinal axis of the printed circuit board 42.
The heat sink 10 comprises a base 12 and a plurality of heat dissipating fins 14 integrally extending therefrom, perpendicular to the base 12 and parallel to each other along a longitudinal axis of the heat sink 10. The base 12 has a substantially rectangular shape and a flat top surface 121 and bottom surface 122 opposite thereto. The heat dissipating fins 14 comprise a plurality of first fins 141 extending from two opposite long sides of the top surface 121 of the base 12 and sandwiching the LED modules 40 therebetween. Heights of the first fins 141 gradually decrease along a traverse away from the LED modules 40. The heat dissipating fins 14 further comprise a plurality of second fins 142 extending from the bottom surface 122 of the base 12. Heights of the second fins 142 gradually decrease along the traverse away from a middle portion of the base 12. Outmost first fins 141 are integrally formed with outmost second fins 142, whereby the outmost first and second fins 141, 142 cooperatively form two opposite sidewalls (not labeled) of the heat sink 10.
Referring to
Referring to
In assembly of the fins 23, the flanges 231, 232 of a fin 23 are aligned with the flanges 231, 232 of an adjacent fin 23. The body 230 of the adjacent fin 23 is pressed towards the fin 23, so that the slots 235 of the tabs 234 of the adjacent fin 23 receive the tongues 238 of the fin 23, firmly attaching adjacent fin 23 thereto. In similar fashion, all the fins 23 are assembled together, with the flanges 231, 232 thereof being coplanar with each other. The top flanges 231 form the engaging surface 21 of each fin array 20, and the bottom flanges 232 form the mounting surface 22 of each fin array 20. Each fin array 20 is thus formed. The fin arrays 20 are mounted on the top surface 121 of the base 12, with the mounting surfaces 22 in contact with the top surface 121. Finally, the heat absorbing plates 30 are mounted on the engaging surfaces 21 of the fin arrays 20, and the LED modules 40 are mounted in a thermally conductive relationship with the heat absorbing plates 30 and the fin arrays 20.
Each engaging surface 21 of the fin array 20 angles upwardly and outwardly from the central line of the top surface 121 of the base 12 toward a corresponding lateral side of the base 12. Each pair of fin arrays 20 symmetrically distributed about the central line of the base 12 have engaging surfaces 21 angling to face the central line of the base 12. In this embodiment, the engaging surfaces 21 of fin arrays 20 are disposed at an identical acute angle with respect to the top surface 121 of the base 12. The LED 44 mounted on the angled engaging surfaces 21 of the fin arrays 20 form a dimensional light source. Thus, the LED lamp 100 has a wider illumination angle than other LED lamps.
In addition, the fins 23 of the fin arrays 20 form air passages (not labeled) therebetween, whereby heat absorbed by the heat absorbing plates 30 from the LED modules 40 can be firstly dissipated by the fins 23 before the heat reaches the heat sink 10 to be dissipated by the heat dissipating fins 14. Thus, the heat of the LED modules 40 can be effectively dissipated to ensure that the LEDs work within the acceptable temperature rang.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
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