Patent ID: 8373932

Claim:
An auto-focusing lens module, to focus an object image onto an image sensor, the auto-focusing lens module comprising: a front lens; a liquid zooming unit adapted with the front lens to condense the object image in front into a first-stage output light, wherein a zoom quantity of the liquid zooming unit is determined by an external control; and an image lens group adapted to output a second-stage output light after receiving the first-stage output light, the image lens group comprising: a first lens having a first surface of the first lens and a second surface of the first lens arranged farther away from the liquid zooming unit compared to the first surface of the first lens, wherein the second surface of the first lens has a convex curving surface arranged protruding on a direction away from the front lens; and a second lens having a first surface of the second lens and a second surface of the second lens, wherein the first surface of the second lens has a concave curving surface arranged indenting on a direction away from the front lens, wherein no optical element with non-zero optical power is disposed between the image lens group and the image sensor, wherein an absolute sag of the convex curving surface of the first lens is larger than an absolute sag of the concave curving surface, and both the convex curving surface and the concave curving surface are sagging toward the the front lens.