Large-field-of-view bi-telecentric camera lens

Abstract

The invention belongs to the optical detection component field and relates to a large-field-of-view bi-telecentric camera lens. The large-field-of-view bi-telecentric camera lens includes a front mirror group, a middle mirror group, a diaphragm and a rear mirror group which are sequentially arranged along an optical axis from an object side to an image side; during imaging, light emitted from an object surface at the object side passes through the front mirror group, the middle mirror group, the diaphragm, and the rear mirror group, and is finally imaged at an image surface at the image side.The structure design of the large-field-of-view bi-telecentric camera lens is reasonable; the imaging quality of the camera lens is high; the total length of the camera lens is small, so that the reduction of the overall size of a detection device can be benefitted, and installation and debugging can be facilitated; the front mirror group, the middle mirror group and the rear mirror group sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens and the seventh lens; the clear apertures of the seven lenses are relatively small, and therefore,the processing cost of the lenses can be reduced. The large-field-of-view bi-telecentric camera lens has the advantages of convenient operation and use, high measurement precision and broad application prospect.

Description

technical field [0001] The invention belongs to the field of optical detection elements, in particular to a bi-telecentric lens with a large field of view. Background technique [0002] As we all know, when optical measurement technology is used to perform high-precision detection of one or several parameters to be measured of the measured object, the imaging lens is a crucial optical component. Traditional ordinary lenses have different magnifications due to different object distances. There is a large measurement deviation, which will seriously affect the measurement accuracy. In order to make up for the deficiencies in the application of traditional ordinary lenses and meet the needs of precision testing in modern society, telecentric lenses have emerged as the times require. Telecentric lenses are mainly designed to correct the parallax of traditional industrial lenses, which can reduce or even eliminate the interference of parallax on measurement accuracy. , it can be ...

AI Technical Summary

Problems solved by technology

[0003] However, the depth of field of the existing general optical lens is very small, and the general optical lens needs to be considered in the design of the optical system due to factors such as adjustable lens aperture, adjustable lens object distance and magnification.

In general industrial inspection or measurement, if the designed part itself has a large height drop, such as gears, cutter heads and other parts, if the entire part is to be inspected, generally in order to improve the accuracy, multi-station methods will be used to collect images. In this way, the detection equipment needs to be equipped with multiple cameras, lenses, light sources and other supporting facilities. At the same time, the detection accuracy needs to be controlled separately, and the work efficiency is low. Moreover, multiple supporting facilities undoubtedly increase the cost of the entire detection equipment, and the later maintenance costs are also significantly increased. Suitable for large-scale promotion and application

At the same time, most of the existing telecentric lenses still have problems such as relatively long lenses and large lenses, resulting in complex structures and inconvenient operation and use.

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