Chinese Journal of Lasers, Volume. 48, Issue 21, 2107003(2021)
Design of Electronic Endoscope Objective Lens Optical System Based on Annularly Stitched Surface
Figures & Tables(19)
Fig. 2. Initial structure and aberration of the system. (a) Structure of double concentric lens; (b) curvature of initial system
Fig. 5. Diagram of system structure and location distribution (#1, #2, #3 as examples) of each ring
Fig. 6. Solution to the curvature radius R4i of the initial structure of each ring
Fig. 7. Surface of each ring and sag deviation between the rings in the YOZ plane of the global coordinate. (a) Profile of each ring in +Y-direction;(b) sag deviation of the adjacent rings
Fig. 10. Optical structure of electronic endoscope optical system. (a) Overall structure; (b) partially enlarged structure
Fig. 12. Performance of electronic endoscope objective lens. (a) Field curvature; (b) distortion
Table 1. Main design parameters of electronic endoscope objective lens
View tableTable 1. Main design parameters of electronic endoscope objective lens
Parameter Specification Wavelength /nm F light, d light, and C light (visible light) Entrance pupil diameter/mm 0.36 Field-of-view (FOV) /(°) 90 Focal length /mm 2 Working distance /mm 20 Total length /mm <3 Image plane size /mm <3.37
Table 2. Main design parameters of electronic endoscope objective lens
View tableTable 2. Main design parameters of electronic endoscope objective lens
Surface type Radius /mm Thickness /mm Material Refractive index Abbe number Object 1 1.023 0.573 1.6 23 2 0.450 0.450 1.5 40 Stop 0.450 1.5 40 4 -0.450 0.573 1.6 23 5 -1.023 0.802 Image -1.828
Table 3. Main parameters of each ring
View tableTable 3. Main parameters of each ring
Parameter #1 #2 #3 #4 #5 #6 FOV /(°) 0 9 18 27 36 45 Radius /mm -0.469 -0.548 -0.687 -0.851 -1.153 -1.225 Focal length /mm 1.189 1.317 1.512 1.697 1.938 2.05 Z coordinate of the vertex of ring /mm 1.081 1.093 1.113 1.115 1.066 1.073
Table 4. Deviation of coordinate and the normal vector on the intersection points of A and Bmm
View tableTable 4. Deviation of coordinate and the normal vector on the intersection points of A and Bmm
Intersection point Δy Δz ΔNy ΔNz A 6.548×10-5 2.888×10-6 9.466×10-5 1.720×10-6 B 1.505×10-5 9.854×10-5 5.394×10-5 7.623×10-5
Table 5. Tolerance analysis items and their values
View tableTable 5. Tolerance analysis items and their values
Item Specification Refractive index 0.0007 Abbe number 0.7% Radius One fringe Thickness /mm 0.02 Irregularity 0.2 fringe Element tilt /(') 3 Element decenter/mm 0.05 for sensitive elements 0.01 for other elements
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Xin Cao, Zhishan Gao, Ningyan Xu, Lu Chen, Qun Yuan, Zhenyan Guo. Design of Electronic Endoscope Objective Lens Optical System Based on Annularly Stitched Surface[J]. Chinese Journal of Lasers, 2021, 48(21): 2107003
Paper Information
Category: biomedical photonics and laser medicine
Received: Feb. 8, 2021
Accepted: Apr. 27, 2021
Published Online: Oct. 27, 2021
The Author Email: Gao Zhishan (zhishgao@njust.edu.cn)
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