Four-Element Wide-Angle Lens System Weight Reduction

The patent applies composite materials by combining glass lens elements with plastic lens elements in a single optical system. Specifically, the four-lens system uses a mix of materials where plastic elements replace some glass elements, achieving weight reduction while maintaining optical performance through careful selection of plastic materials with appropriate refractive indices and Abbe numbers.

The patent applies parameter changes by optimizing key optical parameters including the use of plastic materials with specific refractive indices (1.48-1.70) and Abbe numbers (30-60), controlling the focal length ratios between elements, and adjusting the spacing between lens elements. These parameter optimizations enable a four-element system to achieve the optical performance previously requiring eight or more elements.

The patent applies the principle of using cheaper materials by replacing expensive glass lens elements with plastic lens elements. Plastic materials are significantly cheaper to manufacture, especially when using injection molding processes, while the optical design compensates for material limitations to maintain satisfactory optical performance for the intended application.

The patent applies segmentation by dividing the optical system into four distinct lens elements with specific functions: the first element (negative power) for wide angle control, the second element (positive power) for focal length adjustment, the third element (negative power) for aberration correction, and the fourth element (positive power) for image formation. This segmented approach achieves 150 degrees angle of view with minimal total length.