AUTO FOCUS OPTICAL SYSTEM

摘要

An auto focusing optical system is provided to apply to the camera module of the micro type like the camera phone by reducing the length of the whole optical system. The auto focusing optical system comprises the first optic group(LG1), the second lens group(LG2), and the third lens group(LG3) and fourth lens group(LG4). The aperture stop(1) is arranged near the object side to remove the unnecessary light. The first optic group comprises lenses(110,130) and the liquid crystal lens(120). The first optic group has the refractive power of positive. The second lens group has the face of refraction which is one aspherical. The second lens group has the refractive power of the negative. The fourth lens group has the refractive power of the negative.