Zoom lens

Abstract

The embodiment of the invention discloses a zoom lens. The lens comprises a compensation lens group and a zoom lens group, wherein the compensation lens group and the zoom lens group are arranged along an optical axis from an object party to an image party, the compensation lens group has negative focal power, the zoom lens group has positive focal power, the compensation lens group and the zoom lens group move along the optical axis in a reciprocating way during zooming, the compensation lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from theobject party and the image party, the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from the object party to the image party, the fourth lens has positive focal power, thefifth lens has positive focal power, the sixth lens has negative focal power, the seventh lens has positive focal power, the eighth lens has negative focal power, and the ninth lens has positive focalpowder. In the zoom lens provided by the embodiment of the invention, the focus zoom ratio is larger than 4, no focus deviation is generated when the zoom lens is used under an environment of (-40)-80 DEG C, confocality of visible light and infrared light can be achieved, imaging clearness and resolution both are 4K or above, and the maximum aperture can reach F1.3.

Description

technical field [0001] Embodiments of the present invention relate to optical lens technologies, and in particular to a zoom lens. Background technique [0002] Due to the fixed field of view of the fixed-focus lens, a product can only be used in specific scenarios, resulting in fixed-focus lenses that cannot meet the use requirements in many scenarios. Due to the continuously variable focal length and the continuously variable field of view within a certain range, zoom lenses are more and more popular in the market because they can adapt to more application scenarios. The camera with 4K (3840×2160) resolution has received great attention and application in the field of security because of its ultra-high definition and high degree of restoration of the details of the monitoring screen. [0003] Wide-angle zoom lenses are commonly used in security monitoring systems. Currently, the resolution of mainstream wide-angle zoom lenses is mainly concentrated in the range of 3 milli...

AI Technical Summary

Problems solved by technology

[0003] Wide-angle zoom lenses are commonly used in security monitoring systems. Currently, the resolution of mainstream wide-angle zoom lenses is mainly concentrated in the range of 3 million pixels to 6 million pixels. There are very few types that can meet the requirements of 4K, and the cost is usually high. Difficult to promote in large quantities

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