Zoom lens

Abstract

This invention relates to zoom lens, which comprises orderly from object end to image end with negative diopter ratio first transparent lens set, second set with positive diopter ratio and the third set, wherein, the first and second sets realize times function when their distance change and achieve the focus effect through changing the third lens set; the first lens set comprises at least two negative lens and the near lens sets are made of plastic materials and meets the following conditions: 0.08<|R1 / R2|<0.52, wherein, R1 represents negative lens first surface curvature radius and R2 represents image end second surface curvature radius.

Description

technical field [0001] The invention relates to a zoom lens, in particular to a light-weight zoom lens applied to an imaging device. Background technique [0002] In the prior art, zoom lenses with three lens groups have been widely used in digital photography devices. The zoom lenses sequentially include a first lens group with a negative refractive power, a second lens group with a positive refractive power, and a third lens group with a positive refractive power from the object end to the imaging end. [0003] Recently, the development of digital photographing devices is rapid and tends to be miniaturized. At the same time, the camera components in the digital camera device, such as CCD, also tend to have high pixels. Therefore, in order to overcome optical aberration, the design of the zoom lens is becoming more and more strict. For example, Japanese Laid-Open Patent Application No. 2000-284177 discloses a zoom lens that can quickly focus through a third lens group to...

AI Technical Summary

Problems solved by technology

However, the above-mentioned Japanese laid-open patent application can only correct distortion aberration and field curvature aberration, but cannot meet current requirements for correcting spherical aberration.

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