PROBLEM TO BE SOLVED: To provide an optical axis alignment device for a liquid lens.
SOLUTION: The optical axis alignment device includes a transparent substrate, a symmetric electrode structure, and a transparent insulating layer. The electrode structure is capable of supplying an electric field and defines a central axis of the electrode. The insulating layer provides an optical axis alignment structure symmetric with respect to the electrode central axis so as to enclose the electrode central axis. In particular, at a rest state, an optical axis of the liquid lens and the central axis of electrode are substantially coaxial.
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