Six-Lens Mobile Optical Assembly Aberration Control
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Solution Overview
Problem
Conventional compact optical systems for mobile devices fail to meet the requirements of high resolution and image quality, especially in low light conditions, due to inefficient use of interior space and poor image quality when capturing images.
Innovation Solution
A photographing optical lens assembly comprising six lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, is designed to optimize image quality and compactness by tightly arranging lens elements and controlling entrance pupil diameter and air gaps, enhancing light incidence and illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution are insufficient for high-end mobile terminals
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive power distributions (positive, negative, and mixed), where each element contributes to correcting specific aberrations. The stop is strategically positioned between the third and fourth lens elements to optimize light control and aberration correction, enabling high image quality through segmented functional design
Solution Approach 2:
Different lens elements are assigned specific refractive powers and surface curvatures tailored to their positions in the optical path. The first lens element has positive refractive power with specific curvature relationships, the second has negative refractive power, and subsequent elements have optimized local properties to correct spherical aberration, astigmatism, and other aberrations at different stages of light propagation
2Manufacturing precision
If a six-element lens structure is used to enhance image quality, then the image quality improves, but the interior space utilization becomes inefficient and the system size increases
Solution Approach 1:
The patent optimizes critical parameters including the curvature radii relationships (R1/R2, R3/R4, R5/R6), refractive power distributions, and the position of the stop between the third and fourth lens elements. These parameter optimizations enable compact spacing between elements while maintaining high image quality, achieving efficient space utilization in the optical system
Solution Approach 2:
The six lens elements are tightly arranged in a nested configuration along the optical axis with minimized air gaps between elements. The stop is nested between the third and fourth lens elements, and the entire assembly is designed to fit within a compact form factor suitable for mobile devices, maximizing space utilization
3Volume of stationary object
If the optical system is compacted to reduce size, then the device becomes more portable, but the image quality becomes unclear with low resolution in low light conditions
Solution Approach 1:
The patent optimizes the entrance pupil diameter relative to the total track length (EPD/TL ratio) and the spacing between lens elements to maximize light gathering efficiency in a compact form. The curvature radii and refractive powers are specifically designed to maintain high resolution and minimize aberrations even when the system is compacted, ensuring excellent image quality in low light conditions
Solution Approach 2:
The lens elements feature optimized surface curvatures with specific radius relationships (e.g., R1/R2, R3/R4, R5/R6) that are designed to correct spherical aberration and other monochromatic aberrations. The aspheric surfaces and carefully controlled curvature radii enable high image resolution while maintaining a compact optical system size
4Volume of stationary object
If lens elements are tightly arranged to improve compactness, then the device size is reduced, but spherical aberration and astigmatism increase
Solution Approach 1:
The patent establishes specific parameter relationships including curvature radius ratios (R1/R2, R3/R4, R5/R6), refractive power distributions, and the positioning of the stop between the third and fourth lens elements. These parameter optimizations are designed to correct spherical aberration, astigmatism, and other aberrations even when lens elements are tightly arranged, maintaining high image quality in a compact configuration
Solution Approach 2:
The stop positioned between the third and fourth lens elements serves as an intermediary element that controls light rays and helps correct aberrations. The strategic placement of the stop at this intermediate position in the optical path enables effective aberration correction while maintaining compact spacing between all lens elements
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
The solution improves image quality and resolution while maintaining a compact size, effectively addressing the limitations of conventional systems by increasing relative illumination and reducing spherical aberration and astigmatism.
Implementation Method 1
The fifth lens element with refractive power has an object-side surface being convex in a paraxial region thereof, wherein both of the object-side surface and an image-side surface of the fifth lens element are aspheric
Implementation Method 2
The photographing optical lens assembly has a total of six lens elements with refractive power... reduces spherical aberration and astigmatism
Implementation Method 3
The first lens element has positive refractive power. The second lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof
Data Source
AI summary
A photographing optical lens assembly includes, in order from object side to image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element with negative refractive power has an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region. The third and fourth lens elements have refractive power. The fifth lens element with refractive power has an object-side surface being convex in a paraxial region. The sixth lens element with negative refractive power has an image-side surface being concave in a paraxial region, and an object-side surface and the image-side surface of the sixth lens element are aspheric. The image-side surface of the sixth lens element has at least one inflection point.