A Telecentric Optical Path with Double Ratio

Abstract

The present invention relates to the field of lens technology, in particular to a telecentric optical path with a double magnification, including a front-end lens group, a first rear-end lens group and a second rear-end lens group; The first lens group and the dichroic prism with the focal length arranged in sequence are positive; the first rear end lens group includes the first aperture arranged in sequence from the dichroic prism to the first image side, the second lens group with a negative focal length, and a focal length of The negative third lens group and the fourth lens group with positive focal length; the second rear lens group includes the second diaphragm, the fifth lens group with positive focal length, reflector and the sixth lens group with positive focal length, and the light beam After being split by the dichroic prism, a part of the light beam passes through the second diaphragm, the fifth lens group, the reflector and the sixth lens group in sequence, and the optical axis of the sixth lens group is parallel to the optical axis of the first rear lens group. The invention provides a telecentric optical path with double magnification, which can realize the effects of large field of view, high detection efficiency and small volume.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a double-magnification telecentric optical path. Background technique [0002] The telecentric lens is a high-end machine vision lens, which is characterized by eliminating the problem of different magnifications caused by the inconsistency of the distance between the measured object (or CCD chip) and the lens. Due to the unique technical advantages of the telecentric lens, currently , in the measurement of mechanical parts, plastic parts, glass products and medical parts, electronic components and other high-precision testing requirements, it is especially suitable for precision measurement occasions. [0003] At present, the market demand for telecentric lenses is increasing, and at the same time, the imaging requirements of the lens are stricter, requiring a large field of view, high detection efficiency, and high magnification to improve the demand for high-precision measuremen...

AI Technical Summary

Problems solved by technology

Moreover, when the sensor is determined and the field of view of the lens is large, the magnification of the lens will be reduced, and it is difficult to meet the requirements of large field of view and high magnification at the same time.

[0004] At present, there are also dual-lens structures on the market, and different magnifications are set to improve the efficiency of detection. The structure of this type of dual-lens is as follows: figure 1 As shown, the two lenses are in a vertical relationship. Although this structure improves the detection efficiency, because the directions of the two lenses are inconsistent, the external CCD camera and other structures will cause large volume and inconvenient installation.

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