Optical Image Capturing Module with Movable Lens Groups

The optical system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) that can move independently relative to each other. This segmentation allows each group to contribute differently to focusing and aberration correction, achieving high optical performance in a more compact configuration than conventional 5-6 lens systems.

The patent implements a dynamic focusing mechanism where the first and second lens groups move relative to each other along the optical axis to achieve focusing. Additionally, at least one lens surface (object-side or image-side of first, second, or third lens group) is made aspheric, providing dynamic optical path control. This dynamic design enables compact size while maintaining high optical performance across different focus distances.

The patent utilizes aspheric surfaces on lens elements to control light paths in three-dimensional space more efficiently. The aspheric profiles (with different curvatures in different zones) allow light from wider angles to be focused properly, effectively increasing the functional aperture area without increasing the physical size of the lens elements, thus improving light intake in a compact system.

The patent changes the refractive power distribution among lens groups (first group with positive power, second group with negative power, third group with positive power) and optimizes the focal lengths and spacing. This parameter optimization allows the compact system to maintain a large effective aperture by carefully controlling how light is bent and focused through each group, maximizing light intake despite reduced overall size.

The dynamic focusing mechanism with movable lens groups and aspheric surfaces provides precise control over the optical path, enabling the system to maintain high image quality across different focus distances without requiring additional complex optical elements. This dynamic control compensates for aberrations that would otherwise require more lenses, thus achieving high imaging quality with reduced complexity.

The patent optimizes specific parameter ratios including 0.2<|f1/f2|<2.0, 0.1<|f2/f3|<1.5, and 0.05<IN12/|f2|<0.5, where f1, f2, f3 are focal lengths of the lens groups and IN12 is the distance between first and second lens groups. These parameter constraints ensure proper aberration correction and focus control, achieving high imaging quality while avoiding the need for additional complex optical elements.