一种连续变焦凸轮优化设计及试验验证

罗敏; 张生全; 王海洋; 陈吕吉; 汪兴; 林万宏; 刘永杰; 白忠宏

一种连续变焦凸轮优化设计及试验验证

昆明物理研究所, 云南昆明 650223

详细信息

作者简介:
罗敏（1979-），男，云南陆良人，本科，高级工程师，研究方向：红外系统及结构设计。E-mail：13700601202@139.com

中图分类号: TN214
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- 文章访问数: 204
- HTML全文浏览量: 63
- PDF下载量: 70
出版历程
- 收稿日期: 2022-01-09
- 修回日期: 2022-04-17
- 刊出日期: 2022-09-19

Optimal Design and Experimental Verification of a Continuous Zoom Cam

Kunming Institute of Physics, Kumming 650223, China

摘要

摘要: 具备连续变焦功能是目前先进红外热像仪的重要特征之一，而变焦凸轮是驱动连续变焦光学系统中各镜组运动的关键部件。为了设计出良好性能的变焦凸轮结构，本文首先应用动态光学理论推导出变焦光学系统的像移补偿组公式得到像移补偿组的轨迹曲线，然后利用序列二次规划法（sequential quadratic programming, SQP）优化算法来减小动态光学曲线的压力角，结合光机设计理论运用Creo进行凸轮曲线生成及凸轮槽切除从而获得变焦凸轮结构。再基于有限元分析理论对凸轮结构进行分析，最终通过变焦系统运动及成像结果确认本文方法可行。
- 连续变焦 /
- 变焦凸轮 /
- 像移补偿 /
- 光机设计 /
- 有限元分析
Abstract: The continuous zoom function is one of the important features of the current advanced thermal imaging cameras, and the zoom cam is the key component to drive the movement of each lens group in the continuous zoom optical system. First, this study applies the dynamic optics theory to deduce the image movement compensation group formula of the zoom optical system to obtain the trajectory curve of the image movement compensation group and design a zoom cam structure with good performance. Then, we use the sequential quadratic programming (SQP) optimization algorithm. Combined with the optomechanical design theory, CREO is used to generate the cam curve and cut the cam groove to obtain the zoom cam structure and reduce the pressure angle of the dynamic optical curve. Then, the cam structure is analyzed based on the finite element analysis theory. Finally, the motion of the zoom system and the imaging results confirm the feasibility of the proposed method.
- continuous zoom /
- zoom cam /
- image motion compensation /
- opto-mechanical design /
- finite element analysis

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图 1 连续变焦光学原理示意图

Figure 1. Schematic diagram of the optical principle of continuous zoom

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图 2 光学透镜间隔点示意图

Figure 2. Optical lens spacing point diagram

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图 3 动态光学曲线示意图

Figure 3. Dynamic optical curves schematic

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图 4 变焦凸轮筒三维模型

Figure 4. 3D model of zoom cam barrel

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图 5 一阶模态分析

Figure 5. First-Order modal analysis

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图 6 受力变形云图

Figure 6. Force deformation contour

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图 7 变焦系统实物

Figure 7. Real zoom system

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图 8 小视场图像

Figure 8. Small field of view image

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图 9 大视场图像

Figure 9. Large field of view image

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图 10 中间视场图像

Figure 10. Intermediate field image

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表 1 光学透镜顶点间隔数据

Table 1 Optical lens vertex pitch data

No. a b

1 a₁ b₁

2 a₂ b₂

… … …

400 a₄₀₀ b₄₀₀

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表 2 凸轮设计参数

Table 2 Cam design parameters

Diameter size d/mm 70

Mass m/g 100

moment of Inertia J/kg⋅mm² 110

Pressure angle range α/° 0°-45°

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表 3 凸轮曲线柱坐标数据

Table 3 Cam Design Parameters

No. R θ $ Z $

1 R₁ θ₁ Z₁

2 R₂ θ₂ Z₂

…
…
… …
…
… …
…
… …
…
…

400 R₄₀₀ θ₄₀₀ Z₄₀₀

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