Head-Mounted Optical Lens Assembly for Lightweight Zoom Correction

The patent implements a zoom lens mechanism that enables the optical system to dynamically adjust its focal length between near and far points. The lens groups (first, second, and third lens groups) can move relative to each other along the optical axis, transforming the fixed-focus system into a dynamic variable-focus system. This allows the device to adapt to different viewing distances and user requirements without needing additional corrective glasses.

The patent employs a folded optical path design where the light path is bent at approximately right angles using reflective elements (such as total reflection prisms or mirrors). This allows the optical system to achieve a compact form factor by utilizing the depth dimension rather than extending horizontally. The folded path includes multiple segments (first, second, third, and fourth optical paths) that redirect light through the lens groups and image sensor in a compact arrangement, reducing overall device weight while maintaining imaging performance through careful optical design.

The patent divides the optical system into multiple functional lens groups (first lens group, second lens group, third lens group) that can move independently relative to each other. This segmentation allows each group to be optimized for specific functions: the first lens group handles wide-angle near-point imaging, the second lens group handles telephoto far-point imaging, and the third lens group provides additional optical power. This modular segmentation enables the compact optical assembly to achieve both miniaturization and maintained light-emitting area through coordinated movement of the lens groups during zoom operations.