Zoom lens unit

Abstract

A zoom lens unit comprises, from the objective side to the image side, a fixed lens group of negative focal power, an aperture diaphragm, a zoom lens group of positive focal power, a fixed lens of negative focal power, a focus lens group of positive focal power and an optical filter; the zoom lens group is moved along an optical axis from the image side to the objective side so as to achieve zooming from a wide end to a telescopic end, the focus lens group is moved along the optical axis to achieve variable image side correction and focusing with zooming. The zoom lens unit has the advantagesof light weight, small size, wide angle, multiple zooming in short range, zero distortion, macro shooting and the like.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a zoom lens with small volume, 4K image quality and macro function. Background technique [0002] Since the design of the zoom lens is very limited, in order to take into account the performance of each magnification and obtain a better resolution, zooming is usually achieved by the cooperation of the zoom group and the focus group. The number of lenses is often large, and the accumulation of lenses and the travel allowance of the moving amount will cause the size of the lens to become longer. In order to compress the length, the small magnification zoom lens usually adopts a two-group zoom structure, and the rear group often has a large number of lenses stacked, so the compression method is not effective; because of the pursuit of wide-angle, the first group of lenses has a larger aperture, and the traditional second group structure The second group A group of mov...

AI Technical Summary

Problems solved by technology

The mainstream lens imaging solutions use distortion correction to reduce the impact of distortion, but the correction will cause distortion of the resolution, the effect is not good, and it will bring a large load to the computing chip

[0004] Because the distance difference between macro and normal shooting is too large, ordinary lenses cannot focus on extremely close objects, and a macro lens group needs to be added to the front of the lens, and even after obtaining images in this way, it is often necessary to adjust the focus greatly Groups can achieve a clear picture, and the picture will have serious field curvature. Almost no lens can achieve the same image quality as a long-distance shooting in a macro situation.

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