Wide-angle lens and imaging equipment

Abstract

The invention discloses a wide-angle lens and imaging equipment, and the wide-angle lens sequentially comprises, from an object side to an imaging surface along an optical axis, a first lens with negative focal power, wherein theobject side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface; a fourth lens with positve focal power, wherein the object side surface and the image side surface of the fourth lens are convex surfaces; a diaphragm; a fifth lens with negative focal power, wherein the object side surface and the image side surface of the fifth lens are concave surfaces; a sixth lens with positive focal power, wherein the object side surface and the image side surface of the sixth lens are convex surfaces, and the fifth lens and the sixth lens form a cemented body; and a seventh lens with positive focal power, wherein the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface. The wide-angle lens has the advantages of miniaturization, ultra-large field angle and high resolution.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens and imaging equipment. Background technique [0002] With the improvement of performance and size reduction of commonly used photosensitive elements such as photosensitive coupling device (CCD) or complementary metal oxide semiconductor device (CMOS), higher requirements are put forward for the high imaging quality and miniaturization of matching lenses. . As a key component of the automatic driving assistance system, the vehicle lens has also ushered in rapid development, and the requirements for the lens are getting higher and higher. In some occasions, imaging lenses are required to have good thermal stability and wide-angle characteristics, and all glass materials with relatively stable thermal expansion coefficients are used, resulting in high manufacturing costs and poor market competitiveness; at the same time, the existing wide-angle characterist...

AI Technical Summary

Problems solved by technology

In some occasions, imaging lenses are required to have good thermal stability and wide-angle characteristics, and all glass materials with relatively stable thermal expansion coefficients are used, resulting in high manufacturing costs and poor market competitiveness; at the same time, the existing wide-angle characteristics generally require an increase in the number of lenses. It is not conducive to miniaturization, but also increases aberrations and leads to poor image quality

[0003] At present, plastic lenses are mostly used to reduce costs and reduce weight. However, the thermal expansion and contraction characteristics of plastic lenses are difficult to overcome.

Of course, glass aspheric lenses can also be used to improve imaging quality and meet temperature performance requirements. However, glass aspheric lenses are difficult to manufacture, cost is high, and the lens volume is often large, which is not conducive to the miniaturization and light weight of the lens.

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