BACKGROUND OF THE INVENTION

Field of the Invention

The application relates in general to an optical driving mechanism, and in particular to an optical driving mechanism that includes at least one frame assembly and at least one biasing element.

Description of the Related Art

Thanks to ongoing technological developments, recent electronic devices (such as tablet computers and smartphones) usually include a lens module capable of aiding in photography or recording video, and some are even equipped with dual lens modules, bringing users a wealth of visual enjoyment. However, an image may come out blurry if the user shakes the lens module in the electronic device when using it. To improve image quality, it is increasingly important to design an effectively shockproof lens module. In addition, designers are currently pursuing the miniaturization of such devices, and it is expected that electronic products will be smaller and lighter with each successive generation. Therefore, how to design an optical mechanism with a better optical compensation function with a smaller volume through a special configuration is an important issue.

BRIEF SUMMARY OF INVENTION

To address the deficiencies of conventional products, an embodiment of the invention provides an optical driving mechanism, configured to drive an optical element, including a fixed portion, a movable portion, at least one frame assembly, and at least one biasing element. The fixed portion includes a base which a central axis. The movable portion is configured to sustain the optical element and is movable relative to the fixed portion. The frame assembly connects the fixed portion and the movable portion and includes a plurality of string arms, wherein the string arms form at least one V-shaped structure. The biasing element is disposed on the frame assembly and configured to drive the movable portion to move along a central axis direction relative to the fixed portion, wherein the string arms surround the biasing element and the biasing element at least connects one end portion of the V-shaped structure.

In some embodiments, the frame assembly at least includes four string arms, wherein the string arms form two V-shaped structures which are connected each other, and the biasing element connects two end portions of the V-shaped structures. The extending direction of the biasing element is not parallel to the direction of the central axis. The string arms and the biasing element are disposed on a first surface, and the first surface is parallel to the central axis. The angle between the string arms and the biasing element is less than 45 degrees. The frame assembly presents a parallelogram structure, and the two ends of the biasing element connect the diagonal of the parallelogram structure.

In some embodiments, the frame assembly further includes a linking rod, the two ends of the linking rod are connected to the string arms, wherein the biasing element is surrounded by the linking rod and the string arms, and the two ends of the biasing element connect the linking rod to the end portion, wherein the end portion is at the vertex portion of the inner side of the V-shaped structure. In another embodiment, the biasing element connects the two end portions of the two sides of the V-shaped structure, and the extending direction of the biasing element is parallel to the central axis. The frame assembly further includes an electrical conductor disposed on at least one of the string arms of the frame assembly in a manner of insert molding or 3D molded interconnect device technology, and the electrical conductor is electrically connected to the biasing element.

In some embodiments, the optical driving mechanism further comprises a detection element, configured to detect the motion of the movable portion relative to the fixed portion, wherein the detection element, the frame assembly and the biasing element are arranged along the central axis. The optical driving mechanism further comprises a plurality of frame assemblies which are stacked in the direction of the central axis. The optical driving mechanism further comprises a plurality of biasing elements, wherein the string arms of each frame assembly enclose one biasing element.

In some embodiments, the optical driving mechanism further comprises three frame assemblies which are stacked in the direction of the central axis, and the frame assemblies and the biasing element consist of a frame module, wherein in the direction of the central axis, the frame assembly in the middle position surrounds the biasing element. The optical driving mechanism further comprises a plurality of frame assemblies and a plurality of biasing elements, wherein the frame assemblies surround the movable portion, and the biasing elements are electronically independent of each other. In another embodiment, the optical element is an image sensor, the base has at least one through hole, and the frame assembly extends through the through hole and is connected to the base and the image sensor.

Another embodiment of the invention provides an optical driving mechanism, comprising a fixed portion, a movable portion, a frame assembly and a biasing element. The fixed portion includes a liquid optical element and a base, wherein the base has a central axis. The movable portion includes a contact member, and the movable portion is movable relative to the fixed portion. The frame assembly is connected to the fixed portion and the movable portion and including a plurality of string arms, wherein the string arms at least form a V-shaped structure. The biasing element is disposed on the frame assembly and configured to force the movable portion to move relative to the fixed portion along the direction of the central axis, wherein the contact member is in contact with the liquid optical element via the driving force of the biasing element, and the shape of the liquid optical element is changed.

Another embodiment of the invention provides an optical driving mechanism, comprising a fixed portion, a movable portion, a frame assembly, a biasing element and a driving portion. The fixed portion includes a base, wherein the base has a central axis. The movable portion is movable relative to the fixed portion, including: a holder, configured to sustain the optical element; and a support member, movably connected to the fixed portion. The frame assembly is connected to the support member and the holder and includes a plurality of string arms, wherein the string arms at least form a V-shaped structure. The biasing element is disposed on the frame assembly and configured to force the movable portion to move relative to the fixed portion along the direction of the central axis, and the string arms enclose the biasing element. The driving portion is configured to force the movable portion to move relative to the fixed portion along a first direction, wherein the direction of the central axis is different from the first direction.

In some embodiments, the driving portion includes a coil and a magnetic element, wherein the coil is disposed on the fixed portion, and the magnetic element is disposed on the movable portion. The optical driving mechanism further comprises a plurality of elastic members around the support member, and the elastic members connect the base of the fixed portion to the support member of the movable portion.

