Patent ID: 9140880
Filing Date: 2015-09-22
Classification: G02B

Abstract:
1. A zoom lens configured to form an image of an object at an object side onto an image plane at an image side, the zoom lens comprising: a first lens group disposed between the object side and the image side and having a negative refractive power; a second lens group disposed between the first lens group and the image side and having a positive refractive power; a third lens group disposed between the second lens group and the image side and having a negative refractive power; and a fourth lens group disposed between the third lens group and the image side, wherein the first lens group and the fourth lens group are each a fixed group, the second lens group is capable of moving with respect to the first lens group to achieve zooming, the third lens group is capable of moving with respect to the first lens group to achieve focusing, and the zoom lens satisfies 1.90<T wherein the first lens group comprises a first lens, a prism and a second lens sequentially arranged from the object side towards the image side, the second lens group further comprises an aperture stop, and the prism and the aperture stop satisfy 1<CA