High-definition super wide angle prime lens

Abstract

The invention belongs to the technical field of lenses, particularly to a high-definition super wide angle prime lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object space to the image space, wherein the fourth lens and the fifth lens adopt plastic aspherical lenses; the first lens, the second lens, the third lens and the sixth lens are glass spherical lenses; the first lens is a convex-concave negative focal power lens; the second lens is a bi-concave negative focal power lens; the third lens is a bi-convex positive focal power lens; the fourth lens is a bi-convex positive focal power lens; the fifth lens is a bi-concave negative focal power lens; the sixth lens is a bi-convex positive focal power lens. According to the high-definition super wide angle prime lens, glass lenses and plastic lenses are reasonably combined, so that a large aperture is realized, the imaging quality is good, 4 megapixel can be realized under the precondition that infrared does not focus again, and clear and bright monitoring pictures can be realized even at night with a low illumination level; the lens has a temperature compensation function, and can be used at the temperature of minus 30 DEG C-80 DEG C without being out of focus.

Description

technical field [0001] The invention belongs to the field of lens technology, in particular to a high-definition ultra-wide-angle fixed-focus lens. Background technique [0002] The 2.8mm lens is widely used in occasions that require large field of view monitoring, and the market demand is huge. The traditional 2.8mm lens is usually an all-glass lens. Due to the large field of view (usually the maximum field of view can reach more than 140°), it is difficult to guarantee the edge image quality. [0003] The current high-definition 2.8mm usually has more than 6 glass lenses, the visible light resolution is more than 2 million, and the infrared resolution is more than 1 million. With the development of technology, people have higher and higher requirements for clarity, and chips with 4 million and 5 million pixels emerge in an endless stream, so a 2.8mm lens with a resolution of 5 million pixels is required. According to the traditional way of thinking, there are generally t...

AI Technical Summary

Problems solved by technology

This makes it difficult for ordinary surveillance lenses on the market to take into account the clear imaging of day and night.

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