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Abstract

With the great improvement of microscope property, the eyepiece of microscope is required to have a larger field of view, high magnification, and better imaging quality. Because of the external aperture stop and short focal length, the design difficulty of microscope eyepiece lies in how to correct the distortion and other off-axis aberrations caused by the large field of view, and how to obtain an eye relief that meets the requirements for human observation is also important. The main aberrations of the eyepiece optical system, especially the effect of the optical system with distortion on imaging is analyzed in this paper. The freeform surface is applied to the distortion correction of the optical system of the microscope eyepiece. A wide-angle microscope eyepiece with field of vision of 60° and a magnification of 25× is described in this paper. The full-field distortion is less than 5%. The microscope eyepiece adopts a five-piece three-element structure, in which the freeform surface lens is made of plastic material and is symmetrical about the XOZplane and YOZplane. A high-performance microscope eyepiece design with simple structure, easy processing, and low cost is realized.

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Authors and contacts

Corresponding author:Chang Jun,bitchang@bit.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 61471039)

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References

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设计指标	数值
焦距/mm	10
放大倍率	25×
出瞳直径/mm	2
出瞳距离/mm	7
视场角/(°)	60
后截距/mm	5
畸变/%	< 5%

DownLoad: CSV

表面	半径/mm	厚度/mm	材料
物面	Infinity	Infinity
光阑	Infinity	7.11
2	–16.00	2.26	H-ZLAF78 B
3	–6.00	1.96	ZF4
4	–30.08	0.03
5^*	15.27	5.03	PMMA
6^*	–8.31	0.02
7	8.92	3.00	H-ZK7
8	33.30	1.98	ZF52
9	6.40	5
像面	Infinity	—
*表面5和6为非球面.

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	表面5	表面6
Conic	–4.00	–1.71
E₃	4.18 × 10^–3	0.017
E₅	5.64 × 10^–3	0.019
E₁₀	2.33 × 10^–3	3.00 × 10^–3
E₁₂	–8.73 × 10^–5	2.58 × 10^–4
E₁₄	–4.19 × 10^–5	1.10 × 10^–4
E₂₁	–4.19 × 10^–4	–5.56 × 10^–4
E₂₃	4.59 × 10^–6	6.61 × 10^–6
E₂₅	6.85 × 10^–8	4.95 × 10^–7
E₂₇	1.38 × 10^–7	2.77 × 10^–7
E₃₆	–7.25 × 10^–6	6.64 × 10^–9
E₃₈	6.09 × 10^–6	7.13 × 10^–6
E₄₀	3.81 × 10^–8	3.39 × 10^–7
E₄₂	5.18 × 10^–10	2.58 × 10^–8
E₄₄	–3.43 × 10^–10	7.32 × 10^–9

DownLoad: CSV

评价指标	数值
40 lp/mm处MTF	> 0.3
畸变/%	< 5
场曲/mm	< 0.2

DownLoad: CSV

视场角2ω^'	相对畸变 δy_z^'
40°	5%
60°—70°	10%
> 70°	> 10%

DownLoad: CSV

公差项	公差值
半径/mm	0.02
厚度/mm	0.03
元件倾斜/(°)	0.02
元件偏心/mm	0.02
不规则度/fringes	3
阿贝数/%	2
折射率	0.002

DownLoad: CSV

概率	40 lp/mm处平均MTF
90%	0.508
80%	0.510
50%	0.523
20%	0.540
10%	0.549

DownLoad: CSV

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Vol. 69, Issue 9 - 2020-05-05

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