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Proceedings Paper

The design and fabrication of telecentric lens with large field of view
Author(s): Chun-Li Chang; Kuo-Cheng Huang; Wen-Hong Wu; Yi-Hung Lin
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Paper Abstract

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.

Paper Details

Date Published: 20 August 2010
PDF: 7 pages
Proc. SPIE 7786, Current Developments in Lens Design and Optical Engineering XI; and Advances in Thin Film Coatings VI, 778612 (20 August 2010); doi: 10.1117/12.860394
Show Author Affiliations
Chun-Li Chang, Instrument Technology Research Ctr. (Taiwan)
Kuo-Cheng Huang, Instrument Technology Research Ctr. (Taiwan)
Wen-Hong Wu, Instrument Technology Research Ctr. (Taiwan)
Yi-Hung Lin, National Pingtung Univ. of Science Technology (Taiwan)


Published in SPIE Proceedings Vol. 7786:
Current Developments in Lens Design and Optical Engineering XI; and Advances in Thin Film Coatings VI
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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