With the progress of science and technology and the development of industrial automation, the machine vision technology is widely used in the field of industrial automation detection. Especially the size measurement and surface defects detection of some small particles, the machine vision has clear advantages in precision than human eyes. The application of machine vision is developing towards lager magnification and high resolution. Therefore, the matching lens is needed for this application. Aiming at the needs of multi-surface detection of semiconductor thermoElectric cooler (TEC) components, this paper describes a design of a telecentric lens. Using the telecentric lens, two adjacent surfaces of the TEC components can be imaged simultaneously. This lens includes two right angle prisms, a cubic beam splitter, five lenses and a cemented doublet. Its magnification is -1.5 and and the focal length is 65mm. The maximum distortion of the lens is controlled within 0.2% and the MTF is greater than 0.4 at 100lp/mm. The lens can be adapted to 2/3 "CCD, which can meet the requirements of machine vision detection. Through tolerance analysis, this lens has good tolerance and high cost performance.
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