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Power LED Pointer
The adjacent sketch shows the structure of a PowerLED pointer. The light of a 40mil PowerLED with approx. 1W electrical power is efficiently coupled into a short piece of polymer fiber. The homogeneously mixed light emerges from the fiber end face and is projected via a lens onto the surface to be illuminated. By means of a small slide glued to the end surface of the polymer fiber, an image can be projected enlarged.
The optical properties of the imaging system depend on the following parameters:
- diameter of the fiber end face: realized LED pointers with fiber diameters from 1mm to 3mm,
- the focal length of the imaging lens: lenses with 30mm and 15mm are available for the lens holder used,
- the distance to the surface to be illuminated.