Research on Lens Design for LED Source of Microscopic Measuring System

  • Qiaofen ZhangEmail author
  • Huaizhong Li
  • Liming Wu
  • Jian Gao
  • Guitang Wang
  • Yaohua Deng
Conference paper
Part of the Smart Innovation, Systems and Technologies book series (SIST, volume 130)


Illuminance uniformity and illuminating efficiency are always the key problems of Light Emitting Diode (LED) lighting system design. This study focuses on designing a suitable aspherical surface to create a rectangular and uniform illumination by studying the influence of optical aspheric parameters for a 3D microscopic measurement system. The 3D microscopic measurement system is constructed based on Scheimpflug condition. Then the optical design of LED source to obtain a rectangular-shaped illumination pattern on the DMD chip is simulated and optimized by optical tracing simulation software (TracePro). Our research focuses on the design of the second surface, where the key point of the design is to find appropriate conic constant K2 and the paraxial radius of curvature R2 of the lens, while the first surface of lens is considered as a plane. The conic constant K2 is researched by using the normal equation for conic aspheric and is discussed respectively when the conicoid is parabolic, elliptic and hyperboloidal. The result indicates that paraboloid can get a better uniform rectangular illumination within region than ellipsoid and hyperboloid. The illumination uniformity of the predetermined illumination area on the DMD chip reaches 86.83%.


Scheimpflug condition Illuminance uniformity Conic constant Paraxial radius of curvature Rectangular illumination 



This work was supported by National Natural Science Foundation of China (No. 61705045, No. U1601202, No. 51675106), Guangdong Provincial Science and Technology Research Project (No. 2015B010104008, No. 2016A030308016, No. 17ZK0091), Foundation of Guangdong Province Science and Technology (No. 2017A090905047), Special and Technology Enterprises of Provincial Science and Technology Enterprises of Small and Medium sized (No. 2016A010119143), Foundation of Guangdong Province Science and Technology (No. 201604010011).


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Key Laboratory of Precision Microelectronic Manufacturing Technology & Equipment of Ministry of Education of Guangdong University of TechnologyGuangzhouChina
  2. 2.Griffith School of EngineeringGold Coast Campus, Griffith UniversitySouthportAustralia

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