Zoom lens

Abstract

The embodiment of the invention discloses a zoom lens. The lens comprises a negative focal power compensation lens group and a positive focal power zooming lens group, and the negative focal power compensation lens group and the positive focal power zooming lens group are arranged from an object space to an image space along an optical axis, wherein the compensation lens group and the zooming lensgroup reciprocate along the optical axis during zooming; the compensation lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, and the first lens with negative focal power, the second lens with negative focal power and the third lens with positive focal power are sequentially arranged from the object spaceto the image space; and the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, and the fourth lens with positive focal power, the fifth lens with positive focal power, the sixth lens with negative focal power, the seventh lens with positive focal power, the eighth lens with negative focal power and the ninth lens with positive focal power are sequentially arranged from theobject space to the image space. The zoom lens provided by the embodiment of the invention has a focal length zoom ratio larger than 4, does not run out of focus when used in the environment of minus40-80 DEG C, has wide range of change of field angle, can realize the confocal of visible light and infrared light, has imaging definition and resolution ratio of more than 4K, and can reach F1.3 at the maximum aperture.

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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