Wide-angle lens and imaging equipment

Abstract

The invention discloses a wide-angle lens and imaging equipment. The wide-angle lens sequentially includes: a first lens with negative optical power from the object side to the imaging surface along the optical axis, the object side is convex, and the image side is concave; The second lens with positive refractive power has a convex surface on the object side and the concave surface on the image side; the third lens with positive refractive power has a convex surface on the object side; the fourth lens with positive refractive power has convex surfaces on both the object side and the image side ; Diaphragm; the fifth lens with negative power, its object side and image side are concave; the sixth lens with positive power, its object side and image side are convex, and the fifth lens and the sixth The lenses form a cemented body; the seventh lens with positive refractive power has a concave surface on the object side and a convex surface on the image side. The wide-angle lens has the advantages of miniaturization, super large viewing 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.

Images