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WANG Qi, ZHANG Guo-fang. Design of large zoom ratio compact microscope based on coaxial Kohler illumination[J]. Chinese Optics. doi: 10.37188/CO.2023-0240
Citation: WANG Qi, ZHANG Guo-fang. Design of large zoom ratio compact microscope based on coaxial Kohler illumination[J]. Chinese Optics. doi: 10.37188/CO.2023-0240

Design of large zoom ratio compact microscope based on coaxial Kohler illumination

doi: 10.37188/CO.2023-0240
Funds:  Supported by Improvement and Optimization of Product Performance Techniques: a Revolutionary Project in the Classroom of Chuzhou Polytechnic (No. 2022TZPY046); Industrial Design Specialty Teaching Resource Library Project of Chuzhou Polytechnic (No. 2022jxzyk04)
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  • Corresponding author: wangqi@chzc.edu.cn
  • Received Date: 30 Dec 2023
  • Accepted Date: 15 Apr 2024
  • Available Online: 10 May 2024
  • In order to achieve a large image plane and large zoom ratio in microscopic imaging and solve the problem of the high integration of coaxial Kohler illumination, this paper proposes a design method for a compact optical system with a large zoom ratio based on coaxial Kohler illumination. First, the imaging principle of the continuous zoom optical system of telescopes and microscopes was analyzed, and the design principle of the positive group compensation zoom microscope was analyzed theoretically. Then, the front fixed group was divided into a collimation group and a convergence group, and a beam splitter prism was designed between the two lens groups to achieve a compact coaxial Kohler illumination optical system design by sharing lens groups. Finally, the continuous zoom microscope with a large image plane and the matched coaxial Kohler illumination optical system are designed. The design results show that the zoom ratio of the microscope optical system is 10×, the working distance is 60 mm, the highest resolution of the object side is 1.75 µm, and the coaxial illumination uniformity is 94.3%. The designed microscope has excellent imaging quality, minimal distortion, a smooth zoom curve, and a compact size, verifying the feasibility of the design method.

     

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