Zoom lens

Abstract

The invention discloses a zoom lens. The zoom lens sequentially comprises a first lens group having positive focal power and a second lens group having negative focal power, wherein the first lens group comprises a first lens along the optical axis, and the second lens group comprises a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along the optical axis. The zoom lens is advantaged in that the positions of the second lens to the seventh lens on the optical axis are changed to realize continuous zooming of the zoom lens,the total effective focal length ft when the zoom lens is in a final state and the total effective focal length fs when the zoom lens is in an initial state satisfy a formula of 1.3 <ft / fs <1.5.

Description

technical field

[0001] The present application relates to the field of optical elements, in particular, to a zoom lens. Background technique

[0002] With the development of science and technology, the development of lenses for portable electronic products such as mobile phones is also advancing by leaps and bounds. Today, mobile phones and other portable electronic products generally adopt a "baton" zoom solution in order to achieve the effect of zooming, that is, to simulate the zoom effect by switching the three lenses of "wide-angle lens, standard lens and telephoto lens".

[0003] However, the disadvantages of this multi-lens solution are very obvious. First of all, multiple lenses need to switch between multiple lenses when simulating the zoom effect, making the zoom incoherent. At the same time, lens switching will lead to unstable white balance, and the intuitive effect is not satisfactory when using it. Secondly, the principle of digital crop zoom is still used in...

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