14
2023
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06
Do you know what a telecentric lens is? What are the advantages?
Telecentric lens (Telecentric), mainly for the correction of the traditional industrial lens parallax and design, it can be in a certain range of object distance, so that the magnification of the image obtained will not change, which is not in the same object surface of the measured object is very important for the application. Telecentric lens due to its unique parallel optical path design has been for the lens aberration requirements of high machine vision applications favored.
Telecentric lens design is to eliminate the object under test (or CCD chip) from the lens distance inconsistency, resulting in magnification is not the same. According to the telecentric lens classification design principle are:
(1) object-side telecentric optical path design principle and role:
Object-square telecentric optical path is the aperture diaphragm placed in the optical system like the focal plane, the object-square main light parallel to the optical axis of the main light convergence center is located in the image of the infinite distance, called: the object-square telecentric optical path. Its role is to eliminate the object side due to inaccurate focusing brought about by the reading error.
(2) image-side telecentric light path design principle and role:
Like a telecentric optical path is the aperture diaphragm placed in the optical system of the object side of the focal plane, like the main light parallel to the optical axis of the main light convergence center is located in the object side of the infinite distance, called: like a telecentric optical path. Its role is to eliminate the measurement error introduced by the inaccurate focusing of the image side.
(3) Both sides of the telecentric light path design principle and role:
Combined the dual role of the object side / image side telecentric. Mainly used in the field of visual measurement and inspection.
Keywords: intelligent lighting
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