Popular Science: Concept and Classification of Industrial Lens

Optical lens is generally referred to as camera lens or photographic lens, referred to as the lens, its function is optical imaging. The lens is an important component of the machine vision system, which plays a key role in imaging quality. It has an impact on several main indicators of imaging quality, including: resolution, contrast, depth of field and various aberrations. There are not only a wide variety of lenses, but also a very large difference in quality, but the general user often does not pay enough attention to the choice of lens when designing the system, which leads to the failure of the ideal image and even the failure of the system development. The purpose of this paper is to summarize the relationship between various factors by introducing the classification and main parameters of various common lenses, so that readers can master the skills of lens selection in machine vision system.

Optical Lens Industry Overview

Optical lens is a key component of optical imaging system in electronic equipment. Optical lens is also called camera lens or photographic lens, referred to as the lens, its function is optical imaging. From the structural point of view, the optical lens is usually composed of precision hardware, plastic parts, lenses, apertures, drive motors, sensors and other opto-mechanical and electrical devices and lens barrels, and the principle of optical refraction is used to focus the scene that needs to be photographed on the imaging surface (such as film or image sensor chip) to achieve the final imaging effect. Optical lens is an essential component in the optical imaging system, which directly affects the quality of the image, affects the realization and effect of the algorithm, and has been the key component of the optical imaging system in many electronic devices such as security cameras, mobile phones, vehicle imaging and so on.

The core optical components of the car camera

The on-board camera is known as the "eye of automatic driving" and is the core sensing equipment in the field of ADAS system and automobile automatic driving. The acquisition function of image information is realized mainly through the lens and image sensor, which can realize 360 ° visual perception and make up for the defects of radar in object recognition. It is the sensor closest to human vision.

Aperture of the lens

In addition to the focal length, the aperture is another main parameter to distinguish the difference between the lens, which determines the amount of light in the lens. The size of the aperture directly affects the shutter speed and depth of field, so when shooting night scenes and portrait, when the focal length is equal, we prefer to use a large aperture lens.

Internal structure of the lens

The internal structure of the lens is very complex, and it is also the part that best reflects the quality of a lens, which is directly related to the imaging quality. This part is invisible to us and is generally composed of multiple sets of lenses with complex structures. Different lens processing methods and materials are different. The quality of the lens is not simply proportional to the number of lenses, which requires attention.

External structure of the lens

The visible part of a lens, we call it external structure, usually have, including zoom ring, focus ring, focus mode switch and so on. Of course, on the shell of the lens, the focal length, aperture, aperture and other parameters of the lens will be marked in detail. These are also the most direct way for you to know a lens.