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Principle introduction and application of Telecentric F-theta Lens Assembly
Posted on:
2021-06-03
The working principle of Telecentric F-theta Lens Assembly: The design purpose of Telecentric F-theta Lens Assembly is to eliminate the difference in magnification due to the inconsistency of the distance between the measured object and the lens.
According to the design principles of Telecentric F-theta Lens Assembly:
(1) Design principle of object-side telecentric optical path:
The aperture stop is located on the square focal plane of the object mirror image, the entrance pupil (the image formed by the aperture stop by the optical system in front of the aperture stop is called the entrance pupil, referred to as the entrance pupil) is at infinity, and the principal ray of the off-axis point is parallel to the optical axis , Called the thing side telecentric.
Its function is: it can eliminate the reading error caused by the inaccurate focusing of the object.
(2) Design principle of image-side telecentric optical path:
The aperture stop is located at the focal plane of the objective lens, the chief ray of the outgoing beam is parallel to the optical axis, and the exit pupil is at infinity, which is called image telecentricity.
Its function is: it can eliminate the measurement error caused by the inaccurate focusing on the image side.
(3) Design principle of dual-telecentric optical path on both sides:
Combining the dual functions of the object side/image side telecentricity, the aperture stop is located on the focal plane of the object mirror image and on the objective focal plane of the eyepiece.
Its function is: It combines the advantages of the two, and is mainly used in the field of vision measurement and inspection.
Telecentric F-theta Lens Assembly, as a specially formed optical lens, corrects the parallax of ordinary imaging lenses, thereby ensuring a constant imaging magnification within a certain range of object distances. According to this feature of large depth of field, Telecentric F-theta Lens Assembly can be used in non-contact measurement of three-dimensional targets, in non-contact measurement of part size, product identification, product defect inspection, manipulation of robot equipment and assistance in scientific analysis and exploration, circuit There are wide applications in machine vision fields such as the installation of chips on board and other surface mount components, the inspection of lead frames and ball grid arrays.
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