Internal collecting reflector optics for leds
a technology of led reflectors and optics, which is applied in the direction of instruments, lighting and heating apparatus, semiconductor devices for light sources, etc., can solve the problems of reduced performance, poor efficiency of these types of lamps, and short life of lamps
Inactive Publication Date: 2013-04-25
RAMBUS DELAWARE
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AI Technical Summary
Benefits of technology
The system achieves a highly efficient and controlled light output with reduced sensitivity to dirt and dust, allowing for a compact design and improved power consumption by directing a high percentage of light to the intended object, while minimizing the size of the reflector and heat dissipation challenges.
Problems solved by technology
Although xenon light sources create an enormous amount of light in a small area, efficiency of these types of lamps is poor.
Another drawback with these lamps is the length of their life, which is only a few thousand hours.
Another disadvantage of the xenon light systems is the reduction in performance as a result of the collection of dirt on the optical surfaces.
This collection is compounded by the fact that the lights typically require forced-air cooling.
Only a small amount of dirt on any of these four surfaces significantly reduces the light output of the system
The use of a deep parabolic reflector by searchlight manufacturers adds to the poor efficiency of the overall system.
LEDs don't create light with as high intensity as the xenon light sources.
In summary, the main disadvantages of current xenon based light systems are their short life, the dangers of servicing the systems, and their low efficiency.
Although this type of system is efficient in collecting all of the light from the LED, the ability to control the output is limited.
Therefore, in searchlight systems, the light from the refractive optics does not contribute to the searchlight beam and creates spill light.
Another drawback inherent to the prior art system of FIG. 1 is that the output light comes from two sources, a lens and a reflector.
It is therefore very difficult to optimize the output from both sources simultaneously.
These components also absorb some of the light, thereby reducing the efficiency of the lighting system even further.
Method used
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[0025]Various embodiments of the present invention disclose systems that control the direction and angle of a light output. The output of the systems reduces power consumption by directing a very high percentage of light generated by one or more LEDs specifically to the object designated to be lighted.
[0026]Referring first to FIGS. 2 and 3, an optical system 200 includes an LED assembly 210 that is coupled to a light pipe 220. It will be understood by those skilled in the art that the type and size of the LED assembly 210 may vary with the particular optical system to be used in a given application. The LED assembly 210 is shown with a heat sink plate 230 that conducts heat from an LED die 310 (see FIG. 3).
[0027]While the LED die 310 is generally depicted in the several figures of the drawing as a single element, the LED die 310 may be formed from multiple dies. When multiple dies are used to form the LED die 310, the multiple dies may be bonded together.
[0028]Light pipe 220 may be ...
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An optical system is disclosed that uses an LED light source. The light output is coupled to an optic element formed from a material with a high refractive index. The coupling of the light to the high index material significantly reduces the cone angle of the light. The system is very efficient in that nearly all the light generated by the LED is directed to the intended subject.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of U.S. provisional application No. 61 / 281,544, filed Nov. 18, 2009, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates generally to the collection and control of light from a light emitting diode (LED). More specifically, the invention is directed to the control of the wide angular emission of light from an LED to create a highly controlled beam of light.[0004]2. Background Art[0005]Numerous products require efficient collection and control of light from a light source. A high degree of control is required to create a collimated beam of the type needed for searchlights used for live performances, special events, and illuminating tall structures. The searchlights use a xenon arc type lamp as a light source and a deep parabolic reflector to collect and control the light direction and beam angle. This ...
Claims
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IPC IPC(8): F21V7/04F21V7/08F21V13/04F21V7/06
CPCF21L4/02F21S2/005F21Y2101/02H01L33/58H01L33/60F21V5/02F21V7/06F21V7/08F21V13/04G02B19/0028G02B19/0061F21V7/04F21Y2115/10
InventorRICHARDSON, BRIAN EDWARD
OwnerRAMBUS DELAWARE