Secondary Optical Design And Application Research Of LED

With the rapid development of modern society,traditional fluorescent lamps or incandescent lamps have begun to disappear slowly.The new generation of light-emitting diodes(LEDs for short)is gradually taking the lead with its own unique advantages.In various environments and fields of society we can see the LED figure.Environmental protection,high efficiency,long life and high reliability have become synonymous with LED.Perfect at the same time there are also some shortcomings,due to the light-emitting diode luminous pattern for the Lambertian distribution,the target surface illumination efficiency is low,and easier to produce glare.LED must be certain light distribution design to meet the lighting needs.The research content of this project is based on LED secondary optical design,proposed based on the point light source of uniform lighting secondary optical design;based on LED module secondary optical design,and a super thin straight down LED flat lamp is designed.Finally,the secondary optical design is based on the application of LED light source module in fiber optic landscape light.A fiber optic lighting system is designed in this research through the effective combination of both LED and polymer fiber,and its lighting effect is verified.The details of this paper are as follows:First,several important parametric quantities in photometry relevant to this paper are introduced and ther definition formula are pointed out.Then,the theory of non-imaging optics is introduced,and finally,the types of optical design,the steps of optical design,and the software required for optical design are discussed.A theoretical foundation is laid for the next research content.Secondly,the secondary optical design based on LED point light source is conducted.For the problem of point light source uniform illumination,according to the law of energy conservation,a free-form lens to achieve uniform illumination based on the secondary optical design of LED point light source is designed through MATLAB programming.Since the point light source is an approximation taken by the designer in the design,the effect of LED light source size on uniformity is discussed again for a certain lens height.Then,a secondary optical design based on the LED module is performed.In this paper,a straight-down LED flat panel lamp with a semi-cylindrical microstructure lens is designed to achieve high uniformity of illumination with a thickness of 15 mm.Firstly,the orthorhombic prism is adopted as the design module,and the illumination performance of this module is mainly influenced by four parameters.Based on these four parameters,a single variable analysis was performed to derive the optimal values of each parameter under relative conditions,and finally the Taguchi experimental method was adopted to derive the optimal lens design parameters.The obtained multiple test modules were combined and optimized to obtain a302mm×285mm×15mm ultra-thin LED flat panel lamp with the uniformity of95.53% and the luminous efficiency of 95.99% which meets the current requirements of ultra-thin energy-saving development.Finally,combined with fiber optic lighting technology,a secondary optical design was carried out based on the application of LED light source module in a fiber optic landscape light.The 3D model data of coupling lens and fiber end lens are got based on the energy compensation,and verified by optical simulation and experiment.Experimental results show that the uniformity of the end head reaches 80.4 in the range of-100 mm-100 mm.