Near-infrared wide-angle lens

Abstract

The invention discloses a near-infrared wide-angle lens. The wide-angle lens comprises six lenses which are distributed from the object to the image along the optical axis, wherein the first lens, the second lens and the sixth lens are lenses with negative focal power, the third lens, the fourth lens and the fifth lens are lenses with positive focal power; at least one of the first lens and the second lens is an aspheric lens; the first lens is a meniscus lens, the convex side faces to the object; the second lens is another meniscus lens, the convex side faces to the image; the concave side of the first lens faces to the concave side of the second lens; and a light filter is arranged between the third lens and the fourth lens. By adopting the above design, the image quality can be ensured under the conditions of large aperture and large field-of-view angle, the problems of the near-infrared wide-angle lens such as large distortion and low resolving power, and the near-infrared wide-angle lens of the invention has better technical effect.

Description

technical field [0001] The invention relates to a wide-angle lens, in particular to a high-resolution near-infrared wide-angle lens mainly composed of six groups of lenses. Background technique [0002] With the development of lens technology, the application of wide-angle lens is more and more extensive. [0003] A wide-angle lens, also known as a short focal length lens, is a lens with a shorter focal length than a standard lens and a larger field of view. Generally speaking, its main application occasions and goals are to pursue as high a field of view angle as possible, and at the same time, it is hoped that the image can be as undistorted as possible, especially that the image distortion can be as little as possible. [0004] However, the application of the existing wide-angle lens is relatively narrow, and it cannot be used under the condition of dark light. The method to solve this problem is to make the traditional wide-angle lens into a near-infrared wide-angle len...

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Problems solved by technology

[0005] However, this design also has some disadvantages: First, it is the problem of the imaging quality of this lens. We know that the larger the incident angle of the lens, the more serious the distortion will be. Second, due to the usual design, the above-mentioned filters are mostly set on the side of the overall lens group close to the imaging side. Therefore, when imaging, the light incident into the lens is prone to wavelength shift, resulting in The brightness of the imaging is not enough, which will affect the optical effect of the overall lens imaging

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