Lens assembly, imaging equipment, detection equipment and detection system

Abstract

The invention provides a lens assembly, imaging equipment, detection equipment and a detection system. The lens assembly is applied to a lens and comprises a plurality of lens elements which are arranged in a manner of sharing the same optical axis; the entrance pupil position and the front focal point of the lens assembly are both located outside the lens assembly and located at the object side of the lens assembly; the object-side principal point of the lens assembly is farther from the lens assembly than the front focal point; and the peripheral imaging expansion angle corresponding to thelens assembly meets the following formula: alpha=arctanH / 2f, wherein alpha represents the peripheral imaging expansion angle, the alpha is greater than or equal to 18 degrees and less than or equal to25 degrees, H represents the full-view image height corresponding to the lens assembly, f represents the focal length of the lens assembly, and f is less than 0. Therefore, a single imaging device comprising the lens assembly can image the right opposite surfaces of the workpiece and the imaging device and the side peripheral surface of the workpiece at the same time, and a better imaging qualityis achieved.

Description

technical field [0001] The present application relates to the field of optical imaging, in particular, to a lens assembly, an imaging device, a detection device and a detection system. Background technique [0002] When detecting the appearance defects of the workpiece, it is necessary to obtain the side peripheral image of the workpiece. In the prior art, in order to collect a complete image of the lateral periphery of the workpiece, multiple cameras are usually used to shoot from different angles, or a single camera is used to shoot multiple times from different angles, and then the multiple images collected are processed. Image fusion. However, in this way, the image acquisition process is more complicated and time-consuming, and there are many factors affecting the final image quality (for example, the imaging quality of the camera, the level of image fusion, etc.), so it is not conducive to workpiece detection. [0003] In addition, the imaging of parts with metal sur...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present application is to provide a lens assembly, an imaging device, a detection device and a detection system, which are used to simplify the process of collecting images of the side circumference of the workpiece, improve the efficiency of image collection, improve the quality of the collected images, and improve the existing In the technology, when imaging the side circumference of a part with a metal surface, the non-metallic stains on the surface cannot be imaged or the contrast of the image is poor

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