Four-Lens Optical System Aberration Control via Segmentation
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Solution Overview
Problem
Traditional optical image capturing systems for portable electronic devices face challenges in achieving high pixels, improved imaging quality, and miniaturization while maintaining low distortion and aberration, especially with large aperture and wide view angle designs.
Innovation Solution
The optical image capturing system employs a combination of refractive powers and specific geometrical shapes of four-piece optical lenses with insertion mechanisms to increase light admission and view angle, utilizing refractive indices, Abbe numbers, and precise assembly structures to enhance pixel density and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large aperture design is used to increase light admission, then imaging quality and pixel density are improved, but aberration increases resulting in deterioration of peripheral image formation
Solution Approach 1:
The optical system is divided into multiple lens elements (first through fourth lens elements) with different refractive powers and surface configurations. Each lens element contributes to correcting specific types of aberrations while maintaining overall light admission, thereby resolving the contradiction between large aperture and aberration control.
Solution Approach 2:
Different lens elements have locally optimized properties: the first lens element has a convex object-side surface and concave image-side surface with specific curvature radii to control spherical aberration, while the second lens element has negative refractive power to correct coma and astigmatism. This local optimization allows the system to maintain large aperture while controlling aberrations in different regions of the optical path.
2Adaptability or versatility
If wide view angle design is used to increase field of view, then view angle is improved, but distortion rate increases resulting in deterioration of image formation quality
Solution Approach 1:
The optical system uses four lens elements with specific refractive powers arranged in sequence. The combination of positive and negative refractive powers in different elements allows the system to achieve wide view angle while correcting distortion through the cumulative effect of multiple surfaces.
Solution Approach 2:
The patent specifies precise parameter ranges including curvature radii (R1 through R10), refractive powers (f1 through f4), and spacing between elements (In12 through In45). By optimizing these parameters, the system achieves wide view angle with controlled distortion rate, transforming the trade-off into a balanced design.
3Volume of moving object
If miniaturization is pursued to reduce system size, then device compactness is improved, but difficulty of manufacturing and assembly increases
Solution Approach 1:
The lens elements are arranged in a compact nested configuration where each element is positioned close to the others along the optical axis. The bearing surfaces are designed to interface precisely, allowing miniaturization while maintaining manufacturability through standardized assembly interfaces.
Solution Approach 2:
The bearing surfaces serve multiple functions: they provide mechanical support for precise positioning, define spacing between elements, and facilitate assembly. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing and assembly while achieving miniaturization.
4Measurement precision
If high pixel density is pursued to improve imaging quality, then image resolution is improved, but requirement for precision in optical system increases resulting in higher manufacturing difficulty
Solution Approach 1:
The optical system is segmented into four lens elements with specific refractive powers and surface curvatures. This segmentation allows each element to be manufactured and tested independently, then assembled with precise bearing surfaces that ensure the overall system meets the precision requirements for high pixel density imaging.
Solution Approach 2:
The patent specifies precise parameter ranges for curvature radii, refractive powers, and element spacing. By controlling these parameters within defined ranges, the system achieves the optical precision needed for high pixel density while allowing manufacturing tolerances that make production feasible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively improves imaging quality, reduces aberration, and miniaturizes the optical system while maintaining high pixel density and wide view angles, suitable for applications in portable electronic devices.
Implementation Method 1
an optical image capturing system, in the order from an object side to an image side, includes a first lens element (110), a second lens element (120), a third lens element (130), and a fourth lens element (140)... Each lens element has specific refractive power and refractive index to control light propagation
Implementation Method 2
a first bearing surface of image side (818) on the image-side surface... a second bearing surface of object side (826) on the object-side surface... The second bearing surface of object side (826) and the first bearing surface of image side (818) contact with each other
Data Source
AI summary
An optical image capturing system, sequentially including a first lens element, a second lens element, a third lens element and a fourth lens element from an object side to an image side, is disclosed. The first lens element has negative refractive power. The second through third lens elements have refractive power. The fourth lens element has positive refractive power. At least one of the image-side surface and the object-side surface of each of the four lens elements are aspheric. The optical lens elements can increase aperture value and improve the imagining quality for use in compact cameras.