Six-Lens Imaging Optical System Aberration Correction

The patent applies parameter changes by establishing specific mathematical relationships between the refractive powers of different lenses (e.g., φ1+φ2>0, φ3<0, φ4<0, φ5>0, φ6<0) and setting precise ranges for focal lengths and aperture ratios. This systematic parameter optimization resolves the contradiction by ensuring proper light distribution while maintaining excellent image quality through corrected aberrations.

The patent applies local quality by assigning specific material properties to different lens positions. It specifies that the first lens has refractive index 1.5<n1<2.0 and Abbe number 20<v1<60, while the second lens has 1.5<n2<2.0 and 20<v2<60, and establishes material distribution patterns that optimize light flux locally at each lens position while maintaining overall manufacturing feasibility.

The patent resolves this contradiction by establishing specific parameter relationships: the first lens has positive refractive power (φ1>0), the second lens has negative refractive power (φ2<0) with |φ2|<φ1, the third lens has negative refractive power (φ3<0), and so on. These parameter constraints create a balanced design that achieves wide angle effect without excessive design complexity.

The patent converts the harmful effect of increased aberrations from large aperture into a benefit by using the sixth lens with negative refractive power (φ6<0) and specific focal length relationships (|f6|<f1, |f6|<f2) to actively correct these aberrations. The system transforms the problem of increased aberrations from large aperture into an opportunity for aberration correction, achieving both high light flux and excellent image quality.