LED lens array design method for forming uniform square light spots

Abstract

The invention discloses a LED lens array design method for forming uniform square light spots. The design method comprises the steps that firstly, double-free curved surface collimating lenses are designed; then single-free curved surface lenses are designed between the double-free curved surface collimating lenses and LED light sources; and finally, LED lenses and the LED light sources are combined into unit modules, and the array design is carried out on the unit modules according to a certain coordinate and a rotating angle. According to the LED lens array design method for forming the uniform square light spots, each unit module is composed of one single-free curved surface lens and one double-free curved surface collimating lens, a plurality of refraction optical paths are adopted, the light is controllable, the light condensation effect is good, furthermore, square light spots with uniform illumination are formed on the illumination surfaces after the light sources pass through the lenses, the boundaries of the light spots are clearly visible, the divergence angle is small, and the defect that high angle parts of the light sources cannot be utilized by adopting independentlya Fresnel lens, a plano-convex lens or the like is overcome; and light spot uniformity is easy to control and superior to 95%, and furthermore, the overall LED energy utilization rate can reach 78%, so that the effect of saving light energy is achieved, the energy utilization rate is higher, the utilization rate of light can be effectively improved, and the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to a secondary optical element adapted to an LED light source, in particular to a design method of an LED lens array capable of forming uniform square light spots. Background technique [0002] Semiconductor lighting (LED lighting) is the third light source revolution after incandescent lamps and fluorescent lamps. Due to its outstanding features such as high efficiency, energy saving, environmental protection, long life, and similar point light source, it is one of the most promising high-tech fields in the world in recent years. It has received strong support from major countries and regions in the world. At present, the global LED industry has entered the In the period of rapid development, it is widely used in various indoor and outdoor lighting fields, including flat panel display, digital home appliances, automotive electronics and special lighting, etc. The global LED lighting penetration rate is rapidly increasing. [000...

AI Technical Summary

Problems solved by technology

However, the current market generally uses circular light spots. When the illuminated surface is in the shape of a circular light spot, there will inevitably be dark areas and blind spots at the junction of adjacent lamps, which will make the illuminance of the illuminated surface uneven.

At present, the design method for generating square-shaped light spots has formed a variety of solutions, such as: 1) The peanut structure of the street lamp lens is regulated by the free-form surface to produce square-shaped light spots, but the divergence angle is too large, and the uniformity is mainly determined by a single lens. The light source module determines that the light source array has weak control over the uniformity; 2) Through the imaging principle of the square light source, the secondary optical elements such as the Fresnel lens and the plano-convex lens are used to form a collimated and uniform square spot, but the overall energy utilization of the light source The rate is less than 50%, because it cannot use the light emitted by the high angle of the light source; 3) The compound parabolic reflector can realize the square spot in the near field, but its divergence angle is too large, and it cannot be used for the small angle part of the LED light source. control

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