Total internal reflection lens mounts directly onto bare LEDs
The glue secures the two items together with no air gap for optimal optical coupling, ensuring that the light is transferred from the LED to the TIR lens with minimal sideways losses, giving an optical efficiency of up to 95% of light being directed out of the front of the lens. The units are as small as 4mm diameter and 4.5mm high, about a twentieth of the size of traditional TIR lenses which typically feature a 20mm diameter for an height of 20mm. The new TIR lens can be made from PMMA, silicone or glass depending on how much heat it has to withstand.
These TIR lens were developed to match Escatec’s recently launched heat spreader solution which enables high brightness LEDs to be packed closely together and passively cooled at power densities of up to 10W per mm2. The combined packing densities of the LEDs and TIR lenses sets a new standard for ultra-bright, compact, lightweight lighting solutions such as stage lights, searchlights and even microscope illumination.
A reference design is available with 20W LEDs fitted within an area of 1.4mm by 1.7mm that generates a collimated beam of 10W light power with only +/-12 degrees of dispersion.
Visit Escatec at www.escatec.com
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