Optical System Design of Large Numerical Aperture and Object Telecentricity Detection Lens
Aiming at the problem of circuit board defect detection in industrial on-line testing,a large relative aperture object square telecentric detection system is designed in this paper. This paper is based on the specific parameters of lens design. Firstly,double Gaussian complex system is selected as the initial structure. Then,in order to achieve the require-ments of telecentricity and image quality,a variety of suitable operands are added and optimized repeatedly. Finally,the basic parameters of the lens are obtained:Magnification is 3.5 times,The maximum relative aperture is D/f′=1/1.6 with adjustable aperture,focal length is 100 mm,system length is 560 mm. The maximum telecentricity is 2°,distortion is less than 0.01％,Modulation Transfer function values on the axis are greater than 0.33 at the space of 50 lp·mm-1. MTF values at 0.7 field are greater than 0.18 at the space of 50 lp·mm-1.Color reduction is well at 587～760 nm. The lens design results are reasonable in structure and excellent in image quality. The system has good processing technology and easy to install and calibrate.
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