﻿ 0.5<sup>×</sup>~2.5<sup>×</sup>长工作距离变焦距显微物镜设计
 光学仪器  2018, Vol. 40 Issue (4): 40-46 PDF
0.5×~2.5×长工作距离变焦距显微物镜设计

0.5×~2.5× long working distance zoom microscope objective lens design
FENG Haonan, MEI Qisheng, LIANG Xiuling
Fujian Provincial Key Laboratory of Photonics Technology, Key Laboratory of Opto-Electronic Science and Technology for Medicine, Ministry of Education, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 35007, China
Abstract: According to the characteristics of the zoom theory and microscope objectives, we are designing a continuous zoom microscope objective by using Zemax.The objective consists of 4 doublet lens groups, with simple structure and good image quality.Zoom ranges from 0.5 times to 2.5 times, and its maximum numerical aperture is 0.1.The objective is applicable to the visible light spectrum, which matches the 1/2 inch CCD.Its conjugate distance is 346 mm.Object distance is 76 mm.The whole field of modulation transfer function is greater than 0.3 in the 65 lp/mm spatial frequency.Based on tolerance analysis of the continuous zoom microscope objectives, we get a relatively loose tolerance, which is suitable for mass production.Results show that the zoom microscope objectives can meet the requirements of industrial video detection.
Key words: optical design     zoom microscope objectives     mechanical compensation     tolerance analysis

1 设计要求

 (1)

 (2)

2 设计过程 2.1 初始结构选择

 图 1 初始结构图 Figure 1 Initial configuration
2.2 优化校正

 (3)

3 设计结果与像质评价

 图 2 物镜0.5×、1.5×、2.5×时结构 Figure 2 Objective structure of 0.5×、1.5×、2.5×

 图 3 变倍显微物镜在0.5×、1×、1.5×、2×、2.5×的MTF曲线图 Figure 3 MTF curves for five magnification

4 公差分析

5 结论

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