Lens Driving Module with Folded Optical Path and Magnetic Preloading

The patent implements a folded optical path where light reflects multiple times between mirrors and lens groups, effectively nesting the optical trajectory within a compact volume. The optical axis is folded back on itself, allowing a long focal length telephoto lens to be contained within a short physical distance, thus resolving the contradiction between image quality and module size

The patent transitions from a linear optical path to a three-dimensional folded path by introducing mirrors at angles to reflect light back and forth. This dimensional change allows the optical system to achieve long focal length in a compact footprint by utilizing spatial folding rather than linear extension

The patent designs the folded optical system with multiple lens groups (first, second, and third lens groups) that can independently move along the folded optical path. Each lens group can be actuated separately to achieve different functions: auto focus by moving lens groups along the optical axis, and optical zoom by changing distances between lens groups. This multi-functional design allows a single compact module to perform multiple operations without requiring separate mechanisms for each function

The patent employs dynamically movable lens groups that can change position along the folded optical path. The first, second, and third lens groups are all displaceable, allowing the system to adapt its optical characteristics in real-time. This dynamic configuration enables the same physical structure to achieve different focal lengths and focus distances by simply relocating components within the folded space, rather than requiring multiple fixed functional modules