Zoom lens, camera module, and mobile terminal

A camera module, comprising:

• an image sensor and a zoom lens, wherein the zoom lens allows rays to pass through and illuminate the image sensor,
• wherein the zoom lens comprises a first lens group, a second lens group, a third lens group, and a fourth lens group that are arranged along an object side to an image side,
• wherein the first lens group is a first fixed lens group with positive focal power,
• wherein the second lens group is a zoom lens group with negative focal power,
• wherein the third lens group is a compensative lens group with positive focal power,
• wherein the fourth lens group is a second fixed lens group with positive focal power,
• wherein, in a zooming process of the zoom lens from a short-focal end to a long-focal end, the second lens group moves towards the image side along an optical axis, and the third lens group moves towards the object side along the optical axis such that movements of the second lens group and the third lens group enable the zoom lens to perform continuous zooming,
• wherein the first lens group comprises at least one lens with positive focal power and at least one lens with negative focal power, and a lens in the first lens group and closest to the object side has positive focal power,
• wherein the second lens group comprises at least two lenses, and a lens in the second lens group and closest to the object side has negative focal power,
• wherein the third lens group comprises at least two lenses, and a lens in the third lens group and closest to the object side has positive focal power, and
• wherein the fourth lens group comprises at least one lens, and a lens in the fourth lens group and closest to the object side has positive focal power.

A mobile terminal, comprising:

• an image processor and a camera module,
• wherein the image processor and the camera module are in a communication connection, and the image processor is configured to obtain image data from the camera module and process the image data,
• wherein the camera module comprises an image sensor and a zoom lens, wherein the zoom lens allows rays to pass through and illuminate the image sensor,
• wherein the zoom lens comprises a first lens group, a second lens group, a third lens group, and a fourth lens group that are arranged along an object side to an image side,
• wherein the first lens group is a first fixed lens group with positive focal power,
• wherein the second lens group is a zoom lens group with negative focal power,
• wherein the third lens group is a compensative lens group with positive focal power,
• wherein the fourth lens group is a second fixed lens group with positive focal power,
• wherein, in a zooming process of the zoom lens from a short-focal end to a long-focal end, the second lens group moves towards the image side along an optical axis, and the third lens group moves towards the object side along the optical axis such that movements of the second lens group and the third lens group enable the zoom lens to perform continuous zooming,
• wherein the first lens group comprises at least one lens with positive focal power and at least one lens with negative focal power, and a lens in the first lens group and closest to the object side has positive focal power,
• wherein the second lens group comprises at least two lenses, and a lens in the second lens group and closest to the object side has negative focal power,
• wherein the third lens group comprises at least two lenses, and a lens in the third lens group and closest to the object side has positive focal power, and
• wherein the fourth lens group comprises at least one lens, and a lens in the fourth lens group and closest to the object side has positive focal power.