| 摘要 |
An auto-focusing optical system of a camera module is provided to make the structure compact and to facilitate aberration correction by forming the structure symmetrical to an aperture stop, by disposing the aperture stop in a liquid lens group. In an auto-focusing optical system of a camera module, a liquid lens group(LLG) has the entirely positive refractive force. In the liquid lens group, a liquid lens(LL) contains first conductive or polar liquid and second liquid that is not mixed with the first liquid. The curvature radius of a liquid boundary between the first and second liquids is changed according to the applied voltage. The liquid boundary functions as a refractive surface. A first cover lens(CL1) closes up an object side of the liquid lens. A second cover lens(CL2) closes up an image side of the liquid lens. A solid lens group(SLG) is disposed at the rear side of the liquid lens group. The solid lens group has a second lens(L2) having the positive refractive force and a third lens(L3) having the negative refractive force, which are aligned from an object. An aperture stop(AS) is installed in the liquid lens group. The focus is automatically adjusted by changing the curvature radius of the liquid boundary formed at the liquid lens.
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