Aspherical Seven-Lens Optical Imaging for Aberration Control

The patent employs a compact seven-lens configuration where lenses are arranged in a nested-like structure with optimized spacing. The lenses are positioned closely together with minimized air gaps, creating a compact overall form factor while maintaining seven optical elements for high image quality. This nesting approach allows multiple lenses to occupy reduced space without compromising optical performance.

The patent utilizes aspherical surfaces on multiple lenses (specifically the second, fourth, fifth, sixth, and seventh lenses) to change the geometric parameters of the optical elements. This allows for better light ray control and aberration correction, enabling high-resolution imaging with a reduced number of optical elements and compact spacing between them.

The patent applies aspherical surfaces to five out of seven lenses in the system. The aspherical shapes provide variable curvature that can be precisely controlled to correct spherical aberration, coma, and other optical defects. This is particularly important in the compact design where short focal lengths would otherwise make aberration control difficult with simple spherical surfaces.

The patent specifies different refractive indices for different lenses (n2, n4, n5, n6, n7) to optimize aberration control. By selecting materials with appropriate refractive properties for each lens position, the system achieves effective aberration correction despite the compact focal length. The composite material approach allows each lens to contribute differently to the overall aberration management.