Wide-angle lens

Abstract

The invention discloses a wide-angle lens. The wide-angle lens comprises in sequence from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, the object side tends to be flat, and the image side is concave; the second lens with positive refractive power The second lens, the object side is concave, and the image side is convex; the third lens with positive power, the object side and the image side are both convex; the fourth lens with negative power, the object side and the image side are both It is a concave surface; the fifth lens with positive refractive power, its object side and image side are both convex; the sixth lens with negative refractive power, its object side is convex, and its image side is concave; the first lens with positive refractive power seven lenses whose object side and image side are both convex; and a diaphragm arranged between the second lens and the fourth lens. The wide-angle lens has at least the advantages of light weight, small volume, low cost, good thermal stability, large aperture and high imaging quality.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens. Background technique [0002] In recent years, with the gradual expansion of the application range and scenarios of security monitoring video technology, and the increasing requirements for high-definition, networking, and intelligence in security monitoring, security monitoring lens products have been widely used in optical anti-shake, large aperture, and infrared night vision. The technical level requirements in terms of video, ultra-wide-angle, high reliability, etc. are increasing day by day. [0003] Security monitoring lenses are mostly used in outdoor environments, requiring imaging lenses to have good thermal stability, but all use glass materials with relatively stable thermal expansion coefficients, resulting in high manufacturing costs and poor market competitiveness. At the same time, it is also required that the lens has a large amount of l...

AI Technical Summary

Problems solved by technology

[0003] Security monitoring lenses are mostly used in outdoor environments, requiring imaging lenses with good thermal stability, but all use glass materials with relatively stable thermal expansion coefficients, high manufacturing costs, and poor market competitiveness

At the same time, it is also required that the lens has a large amount of light and high resolution, and it can also take clear pictures in a dark environment, which requires the lens to have a larger aperture. However, the traditional large aperture fixed-focus lens has large volume and edge resolution And the shortcomings of high cost, it is difficult to meet the needs of the security monitoring field

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