Optical lens and imaging equipment

Abstract

The invention discloses an optical lens and imaging equipment. The optical lens sequentially comprises a first lens, a diaphragm, a second lens, a third lens and a fourth lens from an object side to an imaging surface along an optical axis. The first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces; the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens with negative refractive power has an object-side surface being convex in a paraxial region and having at least one inflection point, and an image-side surface being concave in a paraxial region and having at least one inflection point. The four lenses are all plastic aspheric lenses. The optical lens satisfies the conditional expression: 0.5 mm<DM1 / tan(HFOV)<0.7 mm; HFOV represents the maximum half field angle of the optical lens, and DM1 represents the effective half aperture of the first lens. The optical lens at least has the advantages of being small in size, wide in view field and high in pixel.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to an optical lens and imaging equipment. Background technique [0002] The lens is an important part of the optical imaging system, and it is one of the standard configurations of terminals such as smartphones, tablets, security monitoring equipment, and driving recorders. In recent years, with the continuous development of mobile information technology, the demand for terminals has continued to increase, and the number of lenses mounted on terminals has also increased. [0003] With users' enthusiasm for thinner and lighter terminals, and in pursuit of better imaging effects, this requires optical lenses to meet both miniaturization and wide viewing angles. However, among the existing technologies, none of the optical lenses currently on the market can A good balance between miniaturization and wide viewing angle leads to the sacrifice of the viewing angle after realizing ...

AI Technical Summary

Problems solved by technology

[0003] With users' enthusiasm for thinner and lighter terminals, and in pursuit of better imaging effects, this requires optical lenses to meet both miniaturization and wide viewing angles. However, among the existing technologies, none of the optical lenses currently on the market can A better balance between miniaturization and wide viewing angle, resulting in the sacrifice of viewing angle after realizing the miniaturization of the lens, or the defect of larger size after realizing the wide viewing angle of the lens

Images