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19 August 2010 The design and fabrication of telecentric lens with large field of view
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In ultra-precision (distortion < 0.5 %) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view > 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5 % to 0.34 % and the depth of field (DOF) is also improved up to 28.3 mm.
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Chun-Li Chang, Kuo-Cheng Huang, Wen-Hong Wu, and Yi-Hung Lin "The design and fabrication of telecentric lens with large field of view", Proc. SPIE 7786, Current Developments in Lens Design and Optical Engineering XI; and Advances in Thin Film Coatings VI, 778612 (19 August 2010);

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