Study On Three-Dimensional Optical Design Methods Based On High-power LED Source

High-Power LED (Light Emitting Diode), with its long life, low energy consumption,High light efficiency and so on, are gradually replacing traditional lighting, and more andmore widely used in various fields of lighting. As the single LED luminous flux is small, itneed to be multi-LED chips arranged or packaged together to meet the lighting requirements,which promote the development of high-power LED integrated light source. Firstly, this topicintroduced in detail the structure and its light-emitting principle of the LED, optical designtheory of non-imaging optics, then to implement the optical design for the three-dimensionaloptical design to LED integrated light sources, to implement optical system which can form arectangular spot of uniform illumination used in lighting exploratory for high-power LEDlight source executed research.First, establish an extended source model, so that we have an intuitive understanding toLED integrated light source currently on the market. On the basis of the derivation of theconstant intensity three-dimensional compensation factor, it proposed new high-power LEDoptical lens system. Under the premise of know light source radiation characteristics and theneeds of the emitted light intensity distribution, according to etendue conservation and theprinciple of conservation of energy, and put in the three-dimensional compensation factor,relevant data were calculated. And then according to edge ray theory, the lens model whichcan form equal illumination were calculated. Calculate free surface point data based onoptical refraction theorem, and fitting discrete surface data in mechanical design software thatwill become a complete optical free-form surface.Secondly, the two optical design methods which were correspond to illumination of therectangular spot in target surface is explained, one is the design of lens with the naturaldivision of the latitude and longitude lines corresponding to latitude and longitude grid, andanother is the design of lens with different longitudes from high to low latitudes radiationband. According to the energy conservation formula, the corresponding relationship wereestablished by division of the solid angle of LED light source light and the illumination areain the target surface, the illumination area in the target surface which were obtained by twoways emphasis on the different long width ratio, the latter ratio is close to1.Then, the finaloptical lens model were obtained by iteration and calculation in the software.Finally, stimulations for the models above are performed with optical stimulationsoftware. The results show that the efficiency of the optical system and the optical reflectorillumination uniformity are in line with expectations and the design methods are proved to beright.