Patent ID: 7342726
Filing Date: 2008-03-11
Classification: G02B,H04N

Abstract:
1. An autofocusing optical system of a camera module comprising: a first lens group having an overall positive refractive power; a second lens group having an overall negative refractive power, the second lens group including 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 having an overall positive refractive power; and a fourth lens group having an overall negative refractive power.