LED 光学 手电聚光装置 透镜 反光碗.pdf

Flashlight Collimating System Funder Email: mrfunder@ Jan, 2011 1 Outline • Properties of Emitter • Design Objective of Collimating System • Collimating System Overview –Reflector –Lens –Optics 2 Emitter Analysis • Mainstream LEDs: a square emitter located in the center of a hemisphere lens: Include: Cree XP-E, XP-G, XM-L; SSC P4, P7; Lumileds K2, Rebel; Luminus SST series. Exclude: Cree XR-E (has a reflector ring), Luminus CBT-90, Osram golden dragon (no lens), diamond dragon • This Type of LEDs can be approximately formulated as Lambertian sources 3 Spatial Distribution of Flux Energy • The spatial distribution of flux energy can be deducted from the intensity distribution diagram given by the LED manual θ Observation: emitter flux light in 180 (hemisphere) degree, although the intensity peak is θ=0 degree, the energy peak is θ=45 degree 4 The Effect of Hemisphere Lens • The hemisphere lens, which is known to be the “first optics”, has the “magnification effect” • The size of emitter under the lens is magnified to be about n times of its real size, where n is the refractive index of the lens Left: Photo of real emitter(size under lens); Right: Rending mo