Abstract: A thin displacement driving device includes a first movable plate, a second movable plate, an axial limiting unit, a first actuator and a second actuator. The axial limiting unit limits the moving direction of the first movable plate and the second movable late. The first actuator has a first shape memory alloy wire coupled to the first movable plate, and the second actuator has a second shape memory alloy wire coupled to the second movable plate. Movement of the first movable plate by the actuation of the first actuator will trigger movement of the second movable plate, and movement of the second movable plate by actuation of the second actuator will trigger movement of the first movable plate.

Abstract: Provided is a diaphragm sheet transfer device, which is used for a handheld electronic device. Diaphragm sheets include different sizes of a plurality of light through holes. By controlling the positions of the diaphragm sheets, the light through holes with different sizes respectively pass through the incident light paths so that the amount of the light incident to the lens device is changed.

Abstract: The invention provides an aperture switching device for use with lens of mobile device. The lens of the mobile phone or the portable electronic product usually has a fixed aperture of lens, and the aperture size cannot be adjusted. Therefore, the invention provides an aperture switching device for the lens, comprising a plate base, a driving mechanism, a connecting rod and a transfer mechanism, wherein the transfer mechanism comprises a insert piece having a light-transmissive hole, wherein the driving mechanism moves the connecting rod to move the insert piece toward the lens, and replaces the lens aperture with the light-transmissive hole of the insert piece. As such, the invention achieves the purpose of changing the aperture of the lens, and the lens aperture of the mobile device can be substantially switched.