Optical system design method based on combination of TIR and micro-lens array

Abstract

The invention provides an LED high-uniformity and high-efficiency optical system design method based on combination of a TIR and a micro lens array. The micro-lens array not only has the optical performance of a traditional lens, but also has many special optical performances, and is widely applied to LED light sources in recent years. However, most research pays attention to the manufacturing process, and a complete mathematical model for designing and establishing a free-form surface is lacked. Therefore, a set of complete free-form surface micro-lens mathematical model is established according to the TIR characteristics and the refraction law. And a group of differential equations are solved through numerical values to obtain the contour of the free-form surface micro lens. And finally,the micro-lens array is simulated by using ray tracing software Trace Pro under the conditions of a near field and a far field respectively, and the influence of the characteristics of the micro-lensarray on the illumination performance is discusssed. Results show that the smaller the radius of the micro lens is, the better the illumination effect is, the uniformity and efficiency of the micro lens can reach over 90%, and the prospect of the micro lens array in practical application can be effectively broadened.

Description

technical field [0001] The invention belongs to the field of optical technology and lighting technology, and in particular relates to a free-form surface of a microlens used for redistributing energy of an LED light source to realize uniform lighting and high efficiency. Background technique [0002] As the fourth-generation lighting source, light-emitting diodes (LEDs) have many advantages such as small size, fast response, long life, and no pollution. With the continuous improvement of LED light efficiency, LEDs are widely used in indoor lighting and outdoor lighting also increasingly widespread. However, since the spatial light intensity of LEDs approximates the Lambertian cosine distribution, directly using LEDs for lighting without secondary light distribution will form a circular spot with a bright center and gradually darkening surroundings on the target surface, with poor uniformity and large It is difficult for light to irradiate the target surface with a small fie...

AI Technical Summary

Problems solved by technology

However, there are relatively few studies on the application of microlens arrays in LED light sources, and most of the research focuses on the manufacturing process of microlenses, which lacks a complete design of free-form microlens surfaces.

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