Ultra wide-angle lens

Abstract

The invention provides an ultra wide-angle lens. The lens comprises: a first lens group possessing a negative focal power, a second lens group possessing a positive focal power, wherein the first lens group comprises a first spherical lens, a second spherical lens and a third spherical lens which are successively arranged from an object side to an image side; the first spherical lens, the second spherical lens and the third spherical lens are the negative, negative and positive focal powers respectively; the second lens group comprises a fourth spherical lens and a fifth spherical lens which are successively arranged from the object side to the image side; the fourth spherical lens and the fifth spherical lens are the positive and negative focal powers respectively. The ultra wide-angle lens satisfies the following conditions: 0.01< D / | FG1|<1 and 2<D / FG2<4, wherein D is a distance from an object side surface of the first spherical lens to an imaging surface of the ultra wide-angle lens along an optical axis direction; FG1 is an effective focal length of the first lens group and FG2 is the effective focal length of the second lens group. By using the ultra wide-angle lens which satisfies the above conditions, a projection quality is high and costs are low.

Description

technical field [0001] The invention relates to a lens, in particular to a super wide-angle lens. Background technique [0002] The viewing angle of traditional ultra-wide-angle lenses for vehicles is required to be above 90 degrees, and images captured by ultra-wide-angle lenses usually have serious imaging distortion on the screen. Therefore, how to design an ultra-wide-angle lens with a wide viewing angle and without serious distortion of imaging has become a research direction for engineers and technicians in this technical field. In order to reduce imaging distortion, aspheric lenses are generally used to replace spherical lenses in the design process of ultra-wide-angle lenses. However, the production cost of aspheric lenses is relatively high, which is not conducive to saving production costs. Contents of the invention [0003] In view of this, it is necessary to provide an ultra-wide-angle lens with high projection quality and low cost. [0004] A super wide-angl...

AI Technical Summary

Problems solved by technology

In order to reduce imaging distortion, aspheric lenses are generally used to replace spherical lenses in the design process of ultra-wide-angle lenses. However, the production cost of aspheric lenses is relatively high, which is not conducive to saving production costs

Images