大容差多柔性透镜组结构优化设计

doi:10.13229/j.cnki.jdxbgxb20200053

Abstract

Abstract:

The flexible support structure of lens is designed by CAE， and the geometric position parameters are optimized in order to make the surface accuracy of lens meet the requirements of optical system in complex working environment. Firstly， by comparing the commonly used materials and processing technology of the lens support structure， the lens support material is selected， and according to the optical design results， the centering machining technology is used to ensure the straightness of the optical axis. Secondly the suitable flexible structure is chosen and the flexible support according to its central symmetry is designed. Finally， the geometric position of the flexible structure is parameterized， and the structural form of the flexible support is optimized by the integrated optimization method. The experimental results show that the surface shape error （RMS value） of the single lens module is better than λ/50 under three directions of self-weight deformation with temperature ranging from -10 ℃ to 50 ℃， and the first-order resonance frequency of the lens module and the single lens module is no less than 120 Hz. It is verified that the lens can meet the requirements of lens design in the environment of large temperature difference and high frequency vibration.

Key words: flexible support, surface accuracy, finite element simulation, integrated optimization, large temperature difference

CLC Number:

TF303

Liu ZHANG,Xiao-yi ZHENG,Fan ZHANG,Yu ZHAO,Shu-yang ZHAO. Structural optimization design of large tolerance and multi⁃flexibility lens subassembly[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(2): 478-485.

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References 16

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材料名称	密度ρ/（10³kg·m^-3）	弹性模量E/GPa	比刚度（E/ρ）/10⁶m	线胀系数α/（10^-6·K^-1）	导热率λ/（W·m^-1·K）
TC4	4.40	114	25.90	9.10	7.40
铝	2.70	68	25.20	25.00	167.00
镁铝合金	1.80	40	22.20	25.20	201.00
铟钢	8.90	141	15.80	2.60	13.70
低体分SiC/Al	3.00	100	33.30	16.00	155.00
高体分SiC/Al	3.00	180	60.00	8.00	225.00
K9/BK7	2.51	82	32.67	7.10	1.10

变量	取值范围	初始值	优化值
1/(°)	60＜(A)＜120	110	65
2/(°)	60＜(B)＜120	110	116
3/mm	0.3≤(D₁)≤2	1.5	0.5
4/mm	0.3≤(D₂)≤2	1.5	0.5
5/mm	0.3≤(H₁)≤2	1.5	0.8
6/mm	0.3≤(H₂)≤2	1.5	0.8
RMSX/nm	-	0.241	5.67
RMSY/nm	-	0.249	5.77
RMSZ/nm	-	0.44	8.217
RMS（50 ℃）/nm	-	28.187	9.565
RMS（-10 ℃）/nm	-	27.617	9.464

工况载荷	PV值/nm	RMS值/nm
Temp_-10	85.57	9.464
Temp_50	81.257	9.565
Grav_X	29.97	5.67
Grav_Y	30.156	5.77
Grav_Z	42.634	8.217

序号	模态/Hz	振动形式
1	1549.790	Move along Z-axis
2	1582.087	Rotate along Y-axis
3	1582.709	Rotate along X-axis
4	1997.240	Move along X-axis
5	1997.872	Move along Y-axis
6	2278.361	Rotate along Z-axis

项目	技术要求	检验结果
-10 ℃工况面形精度/nm	＜12.66	9.656
50 ℃工况面形精度/nm	＜12.66	9.81
X向重力面形精度/nm	＜12.66	5.194
Y向重力面形精度/nm	＜12.66	5.11
Z向重力面形精度/nm	＜12.66	8.468
焦距/mm	112.5	111.5
F数	5.6	5.42
视场角/(°)	≥34	34.2
分辨率/(p·mm^-1)	≥200l	269l
通过率/%	≥70	81

Structural optimization design of large tolerance and multi⁃flexibility lens subassembly

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