Five-Lens Optical System with Aspheric Inflection for Mobile Imaging

The patent divides the optical system into five distinct lens groups (first through fifth lenses) with specific refractive power configurations. Each lens has defined surface characteristics (convex, concave, aspheric) and focal length relationships. This segmentation allows complex optical functions to be distributed across multiple simpler components, achieving high image quality while maintaining manufacturability through standardized lens design modules.

The patent employs a compact nested arrangement where five lenses are positioned in sequence with optimized spacing. The lenses are arranged to share optical paths and minimize overall system length. Specific focal length ratios (f/f1=0.8-1.2, f/f2=-1.5 to -2.5, f/f3=0.6-1.0, f/f4=-0.8 to -1.5, f/f5=0.5-1.2) enable the lenses to be closely spaced while maintaining optical performance, effectively nesting optical functions within a thin profile suitable for mobile devices.

The patent applies different surface characteristics to different lenses and surfaces within the system. Aspheric surfaces are strategically placed on specific lenses (first, third, and fifth lenses) to locally optimize light control and field coverage. The mixed refractive power configuration (positive and negative lenses) creates localized optical zones that collectively expand the effective field of view while maintaining compact overall dimensions. This local optimization approach allows the compact system to achieve uniform relative illumination across the image plane.