Patent attributes
An autofocusing optical system of a camera module which can be installed in a subminiature camera module. In the optical system, a first lens group has an overall positive refractive power. A second lens group has an overall negative refractive power. The second lens group includes a liquid lens having a meniscus formed between non-miscible first and second liquids, the first liquid having conductivity and polarity, the meniscus having a curvature radius changing in response to a voltage applied to serve as a refractive surface, thereby autofocusing the optical system, a first cover lens for sealing the liquid lens at an object side and a second cover lens for sealing the liquid lens at an image side. A third lens group has an overall positive refractive power. Also, a fourth lens group has an overall negative refractive power.
