Double-magnification telecentric light path

Abstract

The invention relates to the technical field of lenses, in particular to a double-magnification telecentric light path which comprises a front-end lens group, a first rear-end lens group and a secondrear-end lens group. The front-end lens group comprises a first lens group with a positive focal length and a beam splitter prism which are sequentially arranged from an object side to a first image side; the first rear-end lens group comprises a first diaphragm, a second lens group with a negative focal length, a third lens group with a negative focal length and a fourth lens group with a positive focal length which are sequentially arranged from the beam splitter prism to the first image side; the second rear-end lens group comprises a second diaphragm, a fifth lens group with a positive focal length, a reflector and a sixth lens group with a positive focal length. After the light beam is split by the beam splitter prism, a part of the light beam sequentially passes through the second diaphragm, the fifth lens group, the reflector and the sixth lens group, and the optical axis of the sixth lens group is parallel to the optical axis of the first rear-end lens group. The double-magnification telecentric light path provided by the invention can achieve the effects of large visual field, high detection efficiency and small size.

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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