Ultra-high-definition zoom lens with large aperture and ultra wide angle

Abstract

The invention discloses an ultra-high-definition zoom lens with a large aperture and an ultra wide angle. The ultra-high-definition zoom lens comprises a compensating lens group with negative total focal power and a zooming lens group with positive total focal power. The compensation lens group comprises a first lens, a second lens, and a third lens which are arranged successively from an object side to an image side. The zooming lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens which are arranged successively from the object side to the image side. The first lens and the sixth lens are both convex-concave lens with negative focal power. The second lens and the ninth lens are both biconcave lenses with negative focal power. The third lens is a convex-concave lens with positive focal power. The fourth lens and the seventh lens are both biconvex lenses with positive focal power. The fifth lens is a biconvex lens with positive focal power. The eighth lens is a concave-convex lens with negative focal power. The focal length magnification ratio of the ultra-high-definition zoom lens is greater than 4, does not generate a out-of-focus phenomenon when used in an environment from -40 to +80 degrees centigrade, can achieve effects that visible light and infrared light are confocal, resolution is more than 4K, and a maximum aperture can reach F1.3.

Description

Technical field [0001] The invention relates to the technical field of lenses, in particular to a large-aperture ultra-wide-angle ultra-high-definition zoom lens. Background technique [0002] With the development of the security industry, concepts such as ultra-high-definition, starlight-level low illumination, etc. have gradually become popular. As the name suggests, the so-called ultra-high-definition refers to a camera with ultra-high-definition, which has several times the effective pixels of a traditional 1080P camera. Concepts such as low illumination require the lens to have a large aperture and large amount of light. At present, common wide-angle zoom lenses usually have an aperture of F1.6 to 1.8, and the resolution can meet the requirements of 3 megapixels, but this is still not enough for the concept of ultra-high-definition and starlight. Therefore, it is necessary to develop a wide-angle The zoom lens enables it to meet the requirements of ultra-high definition and...

AI Technical Summary

Problems solved by technology

Generally speaking, using more glass spherical lenses can better correct aberrations, improve the resolution of the lens, and increase the aperture. However, more lenses will increase the size of the lens and greatly increase the cost. In this way, if It is difficult to achieve a reasonable balance between lens performance and cost with glass spherical lenses

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