Six-Lens Optical Layout for Thin High-Resolution Camera Modules

The patent applies parameter changes by optimizing the refractive indices, Abbe numbers, and focal lengths of each lens within specific ranges. The first lens has a negative refractive power with specific Abbe number constraints, while subsequent lenses have positive or negative powers with carefully controlled parameters. This systematic parameter optimization allows six lenses to achieve high resolution in a compact configuration

The patent employs aspherical surfaces on multiple lenses (first, second, third, fourth, and sixth lenses) to correct optical aberrations more effectively than spherical surfaces. The aspherical surfaces enable better control of light rays, improving image resolution while maintaining the compact six-lens structure. Specific curvature parameters and aspherical coefficients are optimized for each surface

The patent achieves high resolution with only six lenses by carefully controlling parameters such as the ratio of focal lengths (e.g., f2/f > 0.3 and less than 1.20, where f2 is the focal length of the second lens and f is the overall focal length), Abbe number differences (e.g., V1-V3 > 25 and < 45, where V1 and V3 are Abbe numbers of first and third lenses), and distance ratios (e.g., TTL/f < 1.4, where TTL is the distance from the object-side surface of the first lens to the imaging plane). These constrained parameters enable compact design without sacrificing resolution

The six-lens system is segmented into functional groups: the first lens (negative power) for initial light control, the second and third lenses (positive and negative powers) for focal adjustment, the fourth and fifth lenses (positive and negative powers) for aberration correction, and the sixth lens (positive power) for final image formation. This segmentation allows each lens to contribute optimally to resolution while keeping the total thickness minimal