Focus adjustment module

A focus adjustment module, comprising:

• a first optical element, disposed along an optical axle;
• a guiding track unit, parallel to the optical axle;
• a first guiding unit, to guide the first optical element to move along the optical axle, comprising a first holder and a first flexible member, wherein the first holder fixes the guiding track unit and the first optical element is assembled on the first holder, the first flexible member connects to and drives the first holder, and the first flexible member comprises a first inner section to connect to the first holder, a first outer section opposite to the first inner section and a first middle controlling section between the first inner section and the first outer section;
• and
• a control unit comprising a controller and a power supply, wherein the controller fixes the first flexible member, and the power supply drives the controller to intersect with the optical axle along a control path, wherein the controller moves between an initial position furthest away from the optical axle and a control position closest to the optical axle, and when the controller is at the initial position, the controller is disposed on the first outer section, the first middle controlling section is sustained in a non-deformed state non-parallel to the control path, and the first optical element is disposed on an origin on the optical axle, and when the controller is at the control position, the controller moves from the first outer section to the first middle controlling section to force the first middle controlling section to become deformed and the first optical element is disposed on a focus adjustment point on the optical axle.