Patent ID: 7317584
Filing Date: 2008-01-08
Classification: G02B

Abstract:
1. A zoom lens, suitable for imaging an image onto a photosensitivity element; the zoom lens comprising: a first lens group, having a positive refractive power; a second lens group, having a negative refractive power and located between the first lens group and the photosensitivity element wherein the second lens group comprises at least an aspheric lens and the number of the aspheric lens is smaller than or equal to 2, and wherein the second lens group is suitable for moving a distance D so as to shift the magnification of the zoom lens from a wide-end to a tele-end, while the effective focal length of the zoom lens corresponding to the wide-end is defined as EFL and EFL/D≦0.132; a third lens group, having a positive refractive power and located between the second lens group and the photosensitivity element, wherein the third lens group comprises at least a hybrid lens and the second lens group is suitable for moving between the first lens group and the third lens group; a fourth lens group, having a positive refractive power and located between the third lens group and the photosensitivity element, wherein the fourth lens group is suitable for moving between the third lens group and the image sensor.