zoom lens

Abstract

The invention relates to a zoom lens which sequentially comprises a first lens group with positive diopter, a second lens group with negative diopter, a third lens group with positive diopter, and a fourth lens group with positive diopter from object side to image side. The second lens group and the fourth lens group can move along an optical axis, so that the zoom lens can be focused between a wide-angle end and a telescope end.

Description

technical field [0001] The invention relates to a zoom lens, in particular to a zoom lens with thinness, low cost, high zoom ratio and good imaging quality. Background technique [0002] An image capture device, such as a digital camera or a digital video camera, usually uses a lens module and an image sensor to capture an image of an object to be photographed. Convert analog optical signals into digital electronic signals for subsequent image processing, storage and transmission. [0003] The lens module of the image capture device is usually composed of a plurality of lenses. In order to reduce the cost and weight of the lens and improve the competitive advantage in the market, plastic lenses are usually used instead of glass lenses. However, plastic materials have the disadvantages of easily absorbing water vapor and high light absorption rate; therefore, although the use of plastic lenses can reduce costs, it may not be able to meet the requirements of light and thin le...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the above-mentioned existing image capture device obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

Images