Seven-Lens Optical Imaging Assembly for Compact Mobile Cameras

The optical system is divided into seven distinct lens elements with specific focal powers and surface configurations. Each lens element (first lens with positive focal power, second through sixth lenses with varying focal powers, and seventh lens with negative focal power) is optimized independently to contribute to the overall optical performance while maintaining compact dimensions through distributed optical functions.

The seven lens elements are arranged in a nested configuration along the optical axis, with each subsequent lens positioned within the optical path defined by the previous lenses. This nesting approach allows multiple optical elements to be compactly integrated, achieving high aperture and large imaging surface without proportionally increasing the overall assembly length.

Each lens element is assigned specific local optical properties including particular focal powers (positive or negative), specific surface configurations (convex or concave object-side and image-side surfaces), and optimized curvature radii. The first lens has positive focal power with convex object-side and concave image-side surfaces, while the seventh lens has negative focal power with concave surfaces on both sides, creating localized optical corrections that collectively achieve high performance without requiring uniform complexity throughout the system.

The patent optimizes multiple parameters including refractive indices (N1+N2>3.3), Abbe numbers (78<V1+V2<140), curvature radii ratios (0.3<R1R2/(R3+R4)<0.7), and focal length relationships (0.54<f1/f<0.78, 0.27<f7/(R13-R14)<0.57) to achieve the desired optical performance. These parameter optimizations allow the system to maintain high aperture and large imaging surface while controlling complexity through mathematical relationships between lens properties.

The patent achieves large imaging surface (ImgH>6.2mm) by optimizing the lateral dimensions of the lens assembly while maintaining controlled thickness through the seven-lens configuration. The field of view is expanded to 82°<FOV<95° by distributing the optical power across multiple lens elements rather than relying on a single large element, effectively decoupling the imaging surface area from the overall volume increase.

The seven-lens assembly performs multiple optical functions simultaneously including focusing, field expansion, aberration correction, and image plane formation. This multi-functionality allows the compact lens assembly to support high pixel resolution requirements while maintaining a portable form factor suitable for mobile phone integration.