Industrial lenses are very important imaging components in machine vision systems. For the system to fully perform its functions, industrial lenses must meet the requirements. At the beginning of the 21st century, with the widespread application of machine vision systems in the field of precision inspection, it is difficult for ordinary industrial lenses to meet the inspection requirements. To make up for the shortcomings of ordinary lens applications and meet the needs of precision inspection, telecentric lenses came into being.
Telecentric lens design is based on its unique optical characteristics: high resolution, ultra-wide depth of field, ultra-low distortion, and unique parallel light design, which brings a qualitative leap in precise machine vision inspection.
Telecentric lens is mainly designed to correct the parallax of the traditional industry lens. It can be within a certain object distance range so that the image magnification will not change, which is suitable for the situation where the measured object is not on the same object surface. It is a very important application. Telecentric lenses have always been favored by machine vision applications that require high lens distortion due to their unique parallel optical path design.
Generally, the industry lens with industrial vision technology consists of FA lens, Zoom lens and telecentric lens. When the inspected object has serval surfaces or has angles with lens, or the object is moved up and down, or requires high precision and low distortion, the telecentric lens will be required.
The telecentric industry lens of the telecentric optical system is mainly used for precision measurement. In the precision optical measurement system, due to the ordinary optical lens, there will be certain constraints, such as image distortion, errors caused by the choice of viewing angle, and boundary uncertainty caused by improper light source interference, which will affect the accuracy of measurement. The industrial inspection telecentric lens can effectively reduce or even eliminate the above-mentioned problems. Therefore, the industrial inspection lens has become a decisive component of a precision optical measurement system, and its application fields are becoming more and more extensive.
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