Zoom lens system

Abstract

The invention provides a zoom lens system, which comprises a zooming unit, a compensating unit and an imaging unit arranged on a same optical axis in turn, a driving transmission mechanism and a micro-processing control unit, wherein the driving transmission mechanism comprises a zooming stepping motor and a compensating stepping motor. The zooming unit is arranged on an output shaft of the zooming stepping motor through a driving piece; the compensating unit is arranged on an output shaft of the compensating stepping motor through the driving piece; and the micro-processing control unit adjusts the distance between the compensating unit driven by the compensating stepping motor and the imaging unit according to the distance changes between the zooming unit driven by the zooming stepping motor and the imaging unit. The zoom lens system has the advantages of compact structure, small volume, simple manufacturing, low cost, economization and portability.

Description

technical field [0001] The invention relates to a zoom lens system, in particular to a zoom lens system for a mobile phone, a digital camera or a video camera with a zoom function. Background technique [0002] The zoom lens system is one of the important components of the system with zoom function. The structure of the existing zoom lens system generally includes a zoom unit, a zoom driving device, a compensation unit, a compensation driving device and the like. Wherein the zoom unit includes a first lens group with positive refraction, a second lens group with negative refraction and a third lens group with positive refraction arranged on the same optical axis from the object side to the image side in sequence, in some lens systems The third lens group may not be provided in the lens; the compensation unit is a fourth lens group with positive refraction arranged between the third lens group and the image side. When the magnification is changed from the wide-angle state w...

AI Technical Summary

Problems solved by technology

[0003] It can be seen from the structure of the above-mentioned driving device that the mechanical driving device in the current zoom lens system is very complicated, and it is driven by a power source through two sets of transmission mechanisms to drive the zoom driving device and the compensation driving device respectively.

Its structure includes gears, intermittent transmission mechanism, lead screw and other transmission parts that cooperate with each other, which not only has high manufacturing cost, but also takes up a lot of space, which is not conducive to reducing the volume of the zoom lens system. Ensure high transmission accuracy, otherwise it will greatly affect the imaging quality

In addition, if the optical parameters of the zoom system change, the original mechanical drive device cannot continue to be used, and a suitable mechanical drive device needs to be redesigned, which is not only troublesome in design and manufacture, but also further increases the cost

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